Model 1750A/1770A Dehumidifier
Installation Instructions
SAfETy INSTRUCTIONS
WARNING
1. Improper installation may cause property damage or injury. Installation, service, and maintenance must be performed by a
qualified service technician.
2. 120 Volts may cause serious injury from electric shock. Disconnect electrical power before starting installation or servicing.
Leave power disconnected until installation/service is completed.
3. Sharp edges may cause serious injury from cuts. Use care when cutting plenum openings and handling ductwork.
4. Dropping may cause personal injury or equipment damage. Use tools or two people to transport dehumidifier.
CAUTION
1. Read all instructions before beginning installation.
2. Do not use in pool applications. Pool chemicals can damage the dehumidifier.
3. Do not use solvents or cleaners on or near the circuit board. Chemicals can damage circuit board components.
4. Wait 24 hours before running if the unit has not been shipped or stored in the upright position.
TAblE Of CONTENTS
Safety Instructions 1
Overview 2
Specifications 3
Unpacking and Contents 3
location Considerations 4
Installation Configurations
Whole-Home Installation 6
Spot Installation 8
Convertible Installation 10
Ventilation or Air Cycling 12
Model 70 living Space Control 16
Third-Party Control 17
System Checkout 18
Troubleshooting 19
Mechanical Installation
Duct Collars & Backflow Damper 5
Ductwork Recommendations 5
Drain 6
Float Switch 6
READ AND SAVE THESE INSTRUCTIONS
Download from Www.Somanuals.com. All Manuals Search And Download.
SPECIfICATIONS
Dimensions:..20-3/4”W.x.24”L.x.20-5/8”H.
Airflow:
Adjustable.feet.allow.for.22-5/8”.total.height
1750A
Weight:..1750A.–.93.lbs .
External Static Pressure
0 0.“w c
Airflow
385.CFM
340.CFM
275.CFM
1770A.–.100.lbs
1770A.–[email protected].
0 4.“w c
AHAM.DH-1-2003.80°F,.60%RH.conditions
0 6.“w c
Power:..1750A.–.115.VAC,.8.A,.15.A.circuit.
1770A.–.115.VAC,.14.A,.20.A.circuit.
Unit.equipped.with.8.ft .grounded.power.cord
1770A
External Static Pressure
0 0.“w c
Operating Conditions:..
Airflow
535.CFM
515.CFM
500.CFM
.
.Compressor:.50°F–100°F,.40°F.dew.point.minimum.
Ambient/Inlet.Air:.40°F–140°F,.0%–95%.RH.(non-condensing)
filter:.MERV.8,.washable
0 7.“w c
Compressor Minimum Off Time:.3.minutes.
Compressor Minimum On Time:.3.minutes
0 9.“w c
UNPACKING AND CONTENTS
Do not tip unit to remove from carton.
fIGURE 1 – Opening View and Contents
1 ..Open.carton.completely.by.cutting.each.corner.
from.top.to.bottom
a
b
2 ..Remove.all.cardboard.inner.pack
3 ..See.figure 1.for.opening.view.and.contents
. a .Installation.Instructions
. b .Owner’s.Manual
c
. c .Duct.Collars,.2
. d .Drain.Trap
. e .90°.PVC.Elbow
. f .Backflow.Damper
f
d
e
90-1539
3
Download from Www.Somanuals.com. All Manuals Search And Download.
lOCATION CONSIDERATIONS
1 .Install Unit Indoors:.Do.not.expose.
to.elements
TAblE 1 – location Notes
Application location
Garage basement Crawl Space
2 .Drain Accessibility:.A.condensate.
pump.may.be.required.if.a.drain.is.not.
located.in.the.installation.area
Requirement
Attic
All.ductwork.must.be.
insulated.and.sealed
3 .Power:.Outlet.within.8.ft .of.unit
4 .filter Access:.Allow.for.20”.of.
clearance.on.one.side.of.unit.for.
removal.of.filter.(see.figure 2) .
Drain.pan.with.overflow.
protection.placed.under.unit
5 .Inlet:.Allow.for.12”.of.clearance.to.
access.control.and.control.door/wiring.
access.(see.figure 2) .
fIGURE 2 – Dimensions and location Considerations
20-3/4
(527)
2-1/2
(64)
20-3/4
(527)
24.00
(610)
2-1/2
(64)
9-1/2
(241)
11
(279)
3-7/8
(98)
6-1/2
(165)
Air Outlet
8 in.
9
(229)
Round
Collar
19-5/8
(498)
Damper
Fully Open
Air Flow
Air Inlet
8 in.
Round
Collar
OFF/ON Switch
Drain
Wiring
Access
OFF
ON
Filter Access
(Front and Back)
Power Cord
3
(76)
Max.
1-1/4
(32)
10-3/8
(264)
Adjustable Legs
OUTLET AIR END
FRONT VIEW
INLET AIR END
THERE MUST BE AT LEAST
Two Support Struts
for Suspending
(Bottom of Unit)
SERVICE
CLEARANCE
20 IN. (508mm) OF CLEARANCE
ON EITHER SIDE FOR
FILTER REMOVAL
IF SUSPENDING THE UNIT, USE
TWO STRUTS TO SUPPORT THE
BASE ON THE OUTSIDE EDGES
OF THE FEET LOCATIONS.
THERE MUST BE AT LEAST
12 IN. (305mm) OF CLEARANCE
ON BOTH ENDS FOR
TOP VIEW
OF UNIT
CONTROL SETTINGS
3 in. (76mm) Minimum Clearance
for Filter and Front Panel
Removal (either side)
SERVICE
CLEARANCE
20 in. (508mm) Minimum Clearance
for Filter and Front Panel
Removal (either side)
6 in. (152mm) Minimum Clearance
for Filter and Front Panel
Removal (either side)
SUSPENDING AND SERVICE CLEARANCE
90-1545
4
Download from Www.Somanuals.com. All Manuals Search And Download.
MECHANICAl INSTAllATION
DUCT COllARS & bACKflOW DAMPER
The.backflow.damper.installs.on.the.outlet.side.of.the.dehumidifier,.using.features.molded.
into.the.duct.collar
fIGURE 3 – Install Damper in Collar
1 ..Remove.the.duct.collars.and.backflow.damper.from.the.inner.pack
2 ..Place.the.backflow.damper.in.the.collar.with.the.damper.pivot.shaft.resting.in.the.slot.in.
the.collar.(see.figure 3)
3 ..Position.the.collar.and.damper.with.damper.pivot.shaft.up.and.install.on.the.outlet.panel.
using.four.#8.x.1”.field.supplied.sheet.metal.screws.(see.figure 4) .The.collar.should.sit.
flush.on.the.outlet.panel.and.secure.the.backflow.damper
4 ..Verify.that.the.damper.swings.freely.by.lifting.up.on.the.damper.and.allowing.it.to..
swing.closed
5 ..Make.sure.there.are.no.bends.in.the.ductwork.coming.off.the.outlet.for.a.minimum.of.4” .
This.will.ensure.that.the.ductwork.will.not.interfere.with.backflow.damper.function..
(see.figure 5)
90-1503
fIGURE 4 – Install Collar with Damper on Outlet
fIGURE 5 – Minimum Ductwork bend Distance
4" MIN.
CAUTION
Only install
damper on outlet.
Dehumidifier will
not function if
damper is installed
on inlet.
INLET
OUTLET
BACKFLOW
DAMPER
90-1503
90-1503
DUCTWORK RECOMMENDATIONS
• When ducted to the HVAC supply, the outlet from the dehumidifier
must.be.located.at.least.6”.downstream.of.the.cooling.coil.to.
prevent.outlet.air.from.pulling.moisture.from.the.coil
TAblE 2 – Design Airflows
1750A
275
1770A
CFM
500
• To minimize sound from air movement and vibration, install 5 feet
External.Static.Pressure
Amount.of.8”.Ducting
Notes:
0 6”w c
70.ft
0 9”w c
100.ft
minimum.of.flex.duct.on.the.inlet.and.outlet.of.the.dehumidifier
• Use the least amount of ductwork possible. UL approved, insulated
duct.is.recommended.for.all.connections
• If ventilating, use insulated duct on the dehumidifier inlet duct.
1 ..Duct.length.totals.include.both.inlet.and.outlet.sides
2 ..Elbows,.turns,.and.the.static.pressure.of.the.HVAC.equipment.
will.affect.the.airflow.through.the.dehumidifier
3 .Static Pressure Maximums:..1750A.–.0 8”w c .
1770A.–.1 5”w c
4 ..Ductwork.to.be.installed.in.accordance.with.SMACNA.Standards
5
Download from Www.Somanuals.com. All Manuals Search And Download.
MECHANICAl INSTAllATION (CONTINUED)
DRAIN
1 ..Adjust.feet.of.dehumidifier.to.allow.a.2-1/2”.minimum.clearance.
for.drain.trap .See.figure 6 .Use.the.90°.elbow.if.necessary.for.
clearance.restrictions .See.figure 7
fIGURE 6 – Drain Trap
Drain Outlet
2 ..Use.PVC.primer.and.cement.for.drain.assembly.to.the.dehumidifier.
drain.outlet
High Side
Arrows on
trap show
water flow
direction
3 ..Complete.assembly.by.piping.the.3/4”.PVC.trap.to.a.drain.or.
condensate.pump .Make.sure.the.drain.line.has.a.constant.
downward.slope.and.is.not.kinked
Drain Trap
2-1/2
Low Side
4 ..To.prime.the.drain.trap.and.to.verify.the.drain.line.is.not.blocked,.
slowly.pour.a.pint.of.water.into.the.dehumidifier.drip.pan.located.
below.the.coil
90-961
fIGURE 7 – Drain Trap with 90° Elbow
CAUTION
1. Drain trap must be primed with water before use.
Drain Trap
2. A condensate pan with a float switch is required in attic
installations.
90° PVC Elbow
High Side
Low Side
90-961
flOAT SWITCH
If.the.dehumidifier.is.installed.in.an.attic.or.another.location.requiring.
leak.protection,.the.unit.should.be.placed.in.a.condensate.pan.with.
a.normally.closed,.condensate.overflow.safety.switch.(float.switch) .
Remove.the.jumper.from.the.float.switch.terminals.on.the.control.board.
and.wire.the.float.switch.to.the.terminals .See.figure 8
fIGURE 8 – float Switch Wiring
FLOAT
SWITCH
LOW VOLTAGE NORMALLY
CLOSED FLOAT SWITCH
90-1429
WHOlE-HOME INSTAllATION
This.installation.is.used.when.the.HVAC.equipment.conditions.the.whole.home .
Using.the.dehumidifier.in.conjunction.with.the.HVAC.system.is.the.optimum.solution.
for.year-round,.whole-home.control .This.installation.is.typically.in.basement.or.attic.
locations .Ducting.the.unit.to.the.return.and.supply,.where.air.is.pulled.from.the.
return.duct,.dehumidified,.and.discharged.to.the.supply.duct,.is.the.most.common.
setup .Additional.configurations.include.only.ducting.the.dehumidifier.outlet.to.the.
supply.or.ducting.the.inlet.and.outlet.to.the.return.duct .In.the.latter.case,.the.HVAC.
fan.must.be.activated.during.dehumidification
Required Components
Duct.Work.
18.–.22.AWG.Wire
Optional Components
Condensate.Pan.&.Normally.Closed.Float.Switch.
Model.70.Living.Space.Control.
Third-Party.Control
6
Download from Www.Somanuals.com. All Manuals Search And Download.
WHOlE-HOME INSTAllATION (CONTINUED)
bASEMENT DUCTING & WIRING
fIGURE 9 – Whole-Home basement Installation
fIGURE 10 – Whole-Home basement Wiring
DEHUMIDIFIER
CONTROL BOARD
DEHUMIDIFIED AIR IS SUPPLIED
DOWNSTREAM FROM A-COIL TO
A-COIL
MINIMIZE EVAPORATION OFF A-COIL
SUPPLY DUCT
THERMOSTAT
HVAC EQUIPMENT
RETURN
DUCT
R
C
G
R
C
HVAC / FURNACE
G
W
Y
W
Y
115 VAC
CIRCUIT
AIR IS PULLED FROM
RETURN DUCT
FLOOR DRAIN
DEHUMIDIFIER
CONDENSATE HOSE
(TO COMMON DRAIN OR OUTSIDE)
90-1536
90-1537
ATTIC DUCTING & WIRING
fIGURE 11 – Whole-Home Attic Installation
fIGURE 12 – Whole-Home Attic Wiring
DEHUMIDIFIER
CONTROL BOARD
MAIN SUPPLY DUCT
DEHUMIDIFIER
HVAC EVAPORATOR COIL
HVAC / FURNACE
DEHUMIDIFIED AIR IS
SUPPLIED DOWNSTREAM
FROM EVAPORATOR COIL TO
MINIMIZE EVAPORATION
THERMOSTAT
HVAC EQUIPMENT
R
C
G
R
C
MAIN
RETURN
DUCT
115 VAC CIRCUIT
G
W
Y
W
Y
AIR FILTER
ACCESS
DOOR
CONDENSATE HOSE
(TO COMMON DRAIN
OR OUTSIDE)
LOW VOLTAGE
NORMALLY CLOSED
FLOAT SWITCH
OPTIONAL
EXTERNAL
CONTROL
CONDENSATE PAN
WITH FLOAT SWITCH
LOCATED IN
PRINCIPAL
LIVING
SPACE
LIVING SPACE
90-1536
90-1537
Attic Installation Note:.
Wiring Notes:
The.dehumidifier.must.be.installed.in.a.
secondary.condensate.pan.with.a.float.switch
• If wiring to a Model 70 Living Space Control, see MODEL 70 LIVING SPACE CONTROL
section.on.page.16
• If wiring to a third-party control, see THIRD-PARTY CONTROL section on page 17.
7
Download from Www.Somanuals.com. All Manuals Search And Download.
WHOlE-HOME INSTAllATION (CONTINUED)
DIP SWITCH CONfIGURATION
• HVAC FAN ON: Activating the HVAC fan during dehumidification is
recommended.because.it.offers.better.circulation.and.balancing.of.indoor.air.
conditions .Running.the.HVAC.fan.during.dehumidification.does.not.affect.
moisture.removal.efficiency .If.the.switch.is.put.in.the.HVAC.FAN.OFF.position,.
air.is.pulled.through.the.unit,.dehumidified,.and.circulated.solely.by.the.
dehumidifier.blower
fIGURE 13 – Whole-Home DIP Switch Settings
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
• CYCLE PERIOD: This determines how frequently the dehumidifier will sample
the.air.to.check.the.humidity.level .Set.to.1.hour.and.adjust.as.needed
CYCLE PERIOD
• For Ventilation switch settings, see VENTILATION section beginning on page 12.
• For Local/External switch setting, see THIRD-PARTY CONTROL on page 17.
30 MIN.
1 HOUR
2 HOUR
3 HOUR
90-1538
SEQUENCE Of OPERATION
• Sampling will occur once within the Cycle Period. Sampling is initiated with the first HVAC fan (Gs) call or at the end of the Cycle Period if
a.HVAC.fan.call.is.not.received.within.the.Cycle.Period .At.the.onset.of.sampling,.the.dehumidifier.damper.output.turns.on,.the.dehumidifier.
blower.turns.on,.and.the.green.Status.LED.flashes .
• After three minutes, the dew point of the incoming air is measured and compared to the set point on the control knob. If the dew point of the
incoming.air.is.above.the.set.point,.the.compressor.turns.on.and.the.green.Status.LED.switches.to.solid.illumination .If.the.dew.point.is.below.
the.set.point,.the.dehumidifier.damper.output.turns.off.and.the.dehumidifier.blower.turns.off.along.with.the.green.Status.LED
• The dew point of the incoming air is continuously monitored during compressor operation. When the dew point of the incoming air falls below
the.set.point.on.the.control.knob,.the.dehumidifier.damper.output.turns.off.and.the.dehumidifier.compressor.and.blower.turn.off.along.with.
the.green.Status.LED
SPOT INSTAllATION
In.this.installation.the.dehumidifier.is.not.ducted.to.the.HVAC.system.and.is.used.to.
dehumidify.a.specific.area .This.installation.is.typically.used.in.basements.or.crawl.
spaces .The.dehumidifier.can.remain.non-ducted,.however,.to.achieve.specified.
performance.it.is.recommended.that.the.dehumidifier.be.ducted.to.the.area.requiring.
dehumidification .When.ducted,.grilles.should.be.installed.on.the.inlet.and.outlet.
to.increase.the.pressure.drop.across.the.unit .10.feet.is.the.recommended.distance.
between.inlet.and.outlet.grilles
Required Components
Duct.Work.
Grilles.with.8”.duct.collars
Optional Components
Condensate.Pan.&.Normally.Closed.Float.Switch.
Model.70.Living.Space.Control.
Third-Party.Control
8
Download from Www.Somanuals.com. All Manuals Search And Download.
SPOT INSTAllATION (CONTINUED)
DUCTING & WIRING
fIGURE 14 – Spot Ducted Installation
OUTSIDE AIR TO HOUSE
RETURN DUCT
DEHUMIDIFIED AIR
IS SUPPLIED
TO DUCTED SPACE
Wiring Notes:
SUPPLY DUCT
• No additional wiring required.
• If wiring to a Model 70 Living Space Control, see
MODEL.70.LIVING.SPACE.CONTROL.section.on.
page.16
LIVING SPACE
115 VAC
CIRCUIT
• If wiring to a third-party control, see THIRD-PARTY
HVAC FURNACE
CONTROL.section.on.page.17
GRILLE WITH
8" DUCT COLLAR
EQUIPMENT ROOM
AIR IS PULLED
FROM AREA
CONDENSATE HOSE
(TO COMMON DRAIN
OR OUTSIDE)
DEHUMIDIFIER
FLOOR DRAIN
90-1536
DIP SWITCH CONfIGURATION
• CYCLE PERIOD: This determines how frequently the dehumidifier will sample
fIGURE 15 – Spot DIP Switch Settings
the.air.to.check.the.humidity.level .Set.to.1.hour.and.adjust.as.needed
• For Ventilation switch settings, see VENTILATION section beginning on page 12.
• For Local/External switch setting, see THIRD-PARTY CONTROL on page 17.
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
CYCLE PERIOD
30 MIN.
1 HOUR
2 HOUR
3 HOUR
90-1538
SEQUENCE Of OPERATION
• Sampling will occur at the end of the Cycle Period. At the onset of sampling, the dehumidifier damper output turns on, the dehumidifier blower
turns.on,.and.the.green.Status.LED.flashes
• After three minutes, the dew point of the incoming air is measured and compared to the set point on the control knob. If the dew point of
the.incoming.air.is.above.the.set.point,.the.compressor.turns.on.and.the.green.Status.LED.switches.to.solid.illumination .If.the.dew.point.is.
below.the.set.point,.the.dehumidifier.damper.output.turns.off.and.the.dehumidifier.blower.turns.off.along.with.the.green.Status.LED .The.next.
sampling.will.occur.at.the.end.of.the.next.Cycle.Period
• The dew point of the incoming air is continuously monitored during compressor operation. When the dew point of the incoming air falls below
the.set.point.on.the.control.knob,.the.dehumidifier.damper.output.turns.off.and.the.dehumidifier.compressor.and.blower.turn.off.along.with.
the.green.Status.LED
9
Download from Www.Somanuals.com. All Manuals Search And Download.
CONVERTIblE INSTAllATION
In.this.installation.the.dehumidifier.controls.humidity.in.both.
the.whole-home.and.a.spot.location .The.dehumidifier.will.
dehumidify.the.whole.home.as.the.first.priority,.switching.
to.the.spot.location.after.the.whole-home.dehumidification.
need.has.been.met .Ducting.the.unit.to.the.return.and.supply,.
where.air.is.pulled.from.the.return.duct,.dehumidified,.and.
discharged.to.the.supply.duct,.is.the.most.common.setup,.
with.additional.ducting.run.to.and.from.the.spot.location(s) .
Note:.Convertible.Mode.will.not.work.with.ventilation,.air.
cycling,.or.continuous.HVAC.fan.operation .The.Model.70.
Living.Space.Control.and.third-party.controls.(see.pages.
16-17).cannot.be.used.in.Convertible.Mode.operation
Required Components
Duct.Work.
18.–.22.AWG.Wire.
Grilles.with.8”.Duct.Collars.
2.–.Aprilaire.Model.6508,.8”.Normally.Closed.Damper.
2.–.Aprilaire.Model.6608,.8”.Normally.Open.Damper.
24.VAC.Transformer.(40VA.min ).for.Dampers
NOTE:.4522.Basement.Kit.includes.2.–.6508.Dampers,.2.–.6608.Dampers.
and.a.24.VAC.Transformer
Optional Component
Condensate.Pan.&.Normally.Closed.Float.Switch
DUCTING & WIRING
fIGURE 16 – Convertible Installation
fIGURE 17 – Convertible Wiring
DEHUMIDIFIER
CONTROL BOARD
DEHUMIDIFIER SYSTEM DAMPERS
SPOT WHOLE-HOME
24 VAC
(40 VA min)
TRANSFORMER
DEHUMIDIFIED AIR IS SUPPLIED
DOWNSTREAM FROM A-COIL TO
MINIMIZE EVAPORATION OFF A-COIL
SUPPLY DUCT
THERMOSTAT
HVAC EQUIPMENT
RETURN
DUCT
R
C
G
R
C
NORMALLY CLOSED
DAMPER
G
W
Y
SUPPLY
TO AREA
NORMALLY CLOSED
DAMPER
W
Y
NORMALLY
OPEN DAMPER
RETURN FROM AREA
115 VAC
CIRCUIT
GRILLE WITH 8"
DUCT COLLAR
NORMALLY
OPEN DAMPER
CONDENSATE
HOSE
90-1536
90-1537
10
Download from Www.Somanuals.com. All Manuals Search And Download.
CONVERTIblE INSTAllATION (CONTINUED)
DIP SWITCH CONfIGURATION
• HVAC FAN ON: Activating the HVAC fan during Whole-Home dehumidification
is.recommended.because.it.offers.better.circulation.and.balancing.of.indoor.
air.conditions .Running.the.HVAC.fan.during.dehumidification.does.not.affect.
moisture.removal.efficiency .During.spot.dehumidification,.the.HVAC.fan.will.
not.be.turned.on.regardless.of.the.position.of.the.switch .If.the.switch.is.put.
in.the.HVAC.FAN.OFF.position,.air.is.pulled.through.the.unit,.dehumidified,.and.
circulated.solely.by.the.dehumidifier.blower .
fIGURE 18 – Convertible DIP Switch Settings
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
• CYCLE PERIOD: This determines how frequently the dehumidifier will sample
the.air.to.check.the.humidity.level .Set.to.1.hour.and.adjust.as.needed
CYCLE PERIOD
30 MIN.
1 HOUR
2 HOUR
3 HOUR
• CYCLE TIME: The cycle time potentiometer must be set to OFF for proper
operation
30
MIN.
0
60
MIN
MIN.
OFF
TEST
CYCLE TIME
90-1538
SEQUENCE Of OPERATION
• Whole-Home sampling will occur with the first HVAC fan (Gs) call within the Cycle Period and will override Spot dehumidification.
• At the onset of Whole-Home sampling, the dehumidifier damper output turns on, the dehumidifier blower turns on, and the green Status LED
flashes .After.three.minutes,.the.dew.point.of.the.incoming.air.is.measured.and.compared.to.the.set.point.on.the.control.knob .If.the.dew.
point.of.the.incoming.air.is.above.the.set.point,.the.compressor.turns.on.and.the.green.Status.LED.switches.to.solid.illumination .If.the.dew.
point.is.below.the.set.point,.the.dehumidifier.damper.output.turns.off.and.the.dehumidifier.blower.turns.off.along.with.the.green.Status.LED .
• If a Whole-Home sampling does not occur, Spot sampling will occur at the end of the Cycle Period, if not actively dehumidifying the whole-
home .At.the.onset.of.spot.sampling,.the.dehumidifier.blower.turns.on.and.the.green.Status.LED.flashes .After.three.minutes.the.dew.point.of.
the.incoming.air.is.measured.and.compared.to.the.set.point.on.the.control.knob .If.the.dew.point.of.the.incoming.air.is.above.the.set.point,.the.
compressor.turns.on.and.the.green.Status.LED.switches.to.solid.illumination .If.the.dew.point.is.below.the.set.point,.the.dehumidifier.blower.
turns.off.along.with.the.green.Status.LED
• The dew point of the incoming air is continuously monitored during compressor operation. When the dew point of the incoming air falls below
the.set.point.on.the.control.knob,.the.dehumidifier.damper.output.turns.off.and.the.dehumidifier.compressor.and.blower.turn.off.along.with.
the.green.Status.LED
• After the dehumidifier blower has turned off, one minute must elapse before it can be turned on again (i.e., following a Whole-Home
sampling) .If.one.minute.has.not.elapsed,.the.Status.LED.will.flash.and.the.dehumidifier.blower.will.turn.on.after.one.minute
11
Download from Www.Somanuals.com. All Manuals Search And Download.
VENTIlATION OR AIR CyClING
The.dehumidifier.has.outputs.available.to.open.a.normally.closed.damper.and.
introduce.outdoor.air.though.an.outdoor.air.intake.duct .Ventilation.is.controlled.by.
the.Cycle.Period.switches,.Cycle.Time.potentiometer,.and.Vent-Auto/Vent-Timed.
switches .If.a.normally.closed.ventilation.damper.is.not.installed,.the.dehumidifier.
will.function.in.Air.Cycling.mode,.activating.the.HVAC.blower.to.cycle.air.through.
the.home.based.on.the.Cycle.Period.and.Cycle.Time
Required Components
Aprilaire.Model.6506,.6”.Normally.Closed.Damper.
24.VAC.Transformer.(10VA.min ).for.Ventilation.Damper
Optional Component
8052.Outdoor.Temperature.Sensor
DUCTING & WIRING
fIGURE 19 – Whole-Home with Ventilation
fIGURE 20 – Ventilation Wiring
DEHUMIDIFIED AIR IS SUPPLIED
6" NORMALLY
24 VAC
DOWNSTREAM FROM A-COIL TO
A-COIL
CLOSED DAMPER
(10 VA min)
MINIMIZE EVAPORATION OFF A-COIL
TRANSFORMER
DEHUMIDIFIER
CONTROL BOARD
SUPPLY DUCT
RETURN
DUCT
NORMALLY CLOSED
VENT DAMPER
FUNCTIONS IN
AIR CYCLING
MODE IF
DAMPER NOT
INSTALLED
THERMOSTAT
HVAC EQUIPMENT
HVAC / FURNACE
R
C
G
R
C
115 VAC
CIRCUIT
AIR IS PULLED FROM
RETURN DUCT
G
W
Y
W
Y
FLOOR DRAIN
DEHUMIDIFIER
CONDENSATE HOSE
OPTIONAL OUTDOOR
TEMPERATURE SENSOR
(TO COMMON DRAIN OR OUTSIDE)
Ducting Note: Direct ducting the ventilation intake duct to the
dehumidifier inlet duct is acceptable if the incoming temperature
of the mixed air will be greater than 40°F and less than 100°F.
See page 14 for outdoor
temperature sensor installation.
90-1536
90-1537
DETERMINE VENTIlATION REQUIREMENTS
CAlCUlATING AIRflOW REQUIREMENT
1 ..The.MINIMUM.ventilation.requirement.is.calculated.using.
ASHRAE.62 2-2007 .
TAblE 3 – CfM Required
Number of bedrooms
. .ASHRAE.Airflow.in.CFM.=.[House.Area.in.Sq .Ft .x.0 01]..
+.[(Number.of.Bedrooms.+1).x.7 5]
House Sq. ft.
2
3
4
5
6
. .Notes:.Use.‘Number.of.Bedrooms.+1’.or.the.‘Number.of.
Occupants’,.whichever.is.larger
1000
1500
2000
2500
3000
3500
35
40
45
50
55
40
45
50
55
60
50
55
60
65
70
75
60
65
70
75
80
70
75
80
85
90
2 .Table 3.shows.calculated.airflow.values.to.the.nearest.5.CFM .
If.more.outdoor.air.is.required,.a.second.device.is.advised
3 ..Record.the.Required.CFM .__________
12
Download from Www.Somanuals.com. All Manuals Search And Download.
VENTIlATION OR AIR CyClING (CONTINUED)
DETERMINE fRESH AIR DElIVERy RATE
1 ..Measure.the.negative.static.pressure.of.the.return.system.at.the.location.where.the.outdoor.air.duct.enters.the.return.duct .
2 ..See.Table 4.for.estimated.inlet.airflow.in.CFM,.based.on.duct.type,.length,.and.available.negative.pressure .Use.an.airflow.measuring.device.
for.a.more.accurate.airflow.delivery.rate
3 ..Record.the.Delivered.CFM .__________
TAblE 4 – CfM Delivered
Negative Static Pressure (“w.c.) as Measured for Return Duct or Plenum
Duct length
0.05
0.1
0.15
0.2
0.25
0.3
flex
60
Pipe
65
flex
85
Pipe
90
flex
105
100
95
Pipe
110
105
100
flex
120
115
110
Pipe
125
120
115
flex
135
130
125
Pipe
140
135
130
flex
150
140
130
Pipe
160
150
140
10 ft.
20 ft.
30 ft.
55
60
80
85
50
55
75
80
Note:.For.the.table.above,.6”.flex.duct.is.laid.loose.with.two,.wide.90°.bends.and.a.fully.opened.damper .Rigid.pipe.values.are.based.on.6”.duct,.
two.90°.elbows,.and.a.fully.open.damper .In.both.cases,.the.air.intake.is.through.a.metal.vent.hood.with.inlet.screen .Airflow.may.need.to.be.
adjusted.up.or.down.for.variations.in.duct.work
DETERMINE CyClE TIME
1 ..Use.the.Required.CFM.and.Delivered.CFM.from.the.above.steps.to.determine.the.Cycle.Time.from.Table 5 .
2 ..The.values.are.listed.for.a.1.hour.Cycle.Period .For.a.2.hour.Cycle.Period,.set.the.Cycle.Time.to.twice.the.values.listed.in.Table 5
3 ..The.values.highlighted.in.gray.cannot.be.set.due.to.the.maximum.60.minute.Cycle.Time .A.second.ventilation.device.(i e ,.bigger.duct.or.
second.duct).will.be.required.to.meet.ventilation.needs
TAblE 5 – Cycle Time Setting (minutes) for Airflow Delivered vs. Airflow Required for 1 hour Cycle
CfM Required
CfM Delivered
20
20
15
15
10
10
10
30
30
25
20
15
15
10
40
40
30
25
20
15
15
50
50
40
30
25
20
20
60
60
45
35
30
25
25
70
70
55
40
35
30
25
80
80
60
50
40
35
30
90
90
70
55
45
40
35
100
100
75
60
80
100
120
140
160
60
50
45
40
13
Download from Www.Somanuals.com. All Manuals Search And Download.
VENTIlATION OR AIR CyClING (CONTINUED)
SETTING DIP SWITCHES & CyClE TIME TO MEET VENTIlATION REQUIREMENTS
fIGURE 21 – VENT-TIMED DIP Switch Settings
fIGURE 22 – VENT-AUTO DIP Switch Settings
SYSTEM SETUP
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
LOCAL
EXTERNAL
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
CYCLE PERIOD
CYCLE PERIOD
30 MIN.
1 HOUR
2 HOUR
3 HOUR
30 MIN.
1 HOUR
2 HOUR
3 HOUR
30
30
MIN.
MIN.
0
60
0
60
MIN
MIN.
MIN
MIN.
OFF
TEST
OFF
TEST
CYCLE TIME
CYCLE TIME
90-1538
90-1538
Switch Notes:
• Setting the Cycle Time ≥.Cycle.Period.will.result.in.constant.ventilation
• Setting the Cycle Time to OFF will disable ventilation.
1 ..Set.VENT-AUTO.and.VENT-TIMED.switch .VENT-AUTO.restricts.ventilation.based.on.outdoor.temperature.(incoming.air.conditions).and..
VENT-TIMED.allows.ventilation.regardless.of.outdoor.air.conditions .The.VENT-AUTO.configuration.requires.the.installation.of.the.Model.8052.
outdoor.temperature.sensor.(ODT) .
2 ..Set.the.Cycle.Period.by.moving.the.1/2,.1,.2,.or.3.hour.switch.to.the.ON.position .The.Cycle.Period.is.the.time.over.which.a.ventilation.cycle.
will.occur .The.default.position.is.1.hour
3 ..Set.the.Cycle.Time,.determined.in.Table 5,.by.rotating.the.potentiometer.between.0.minutes.and.60.minutes .The.Cycle.Time.determines.how.long.
during.each.Cycle.Period.ventilation.will.occur .Once.the.ventilation.time.requirement.is.met,.ventilation.will.not.occur.until.the.next.cycle.period
OUTDOOR TEMPERATURE SENSOR INSTAllATION
The.ODT.should.be.installed.outside.in.a.shaded.location.(see.figure 23),.or.in.the.outside.intake.ventilation.duct.(see.figure 24)
fIGURE 23 – ODT Mounted Outside
fIGURE 24 – ODT Mounted in Intake Duct
NORTH, EAST
OR WEST SIDE
OF HOME
OUTDOOR
TEMPERATURE
SENSOR
CENTER LINE
SENSOR
SENSOR
BRACKET
36" MAX.
OUTDOOR
TEMPERATURE SENSOR
LEADS
ABOVE EXPECTED
SNOW LINE
OUTSIDE WALL
B2202617-D
B2202617-E
14
Download from Www.Somanuals.com. All Manuals Search And Download.
VENTIlATION OR AIR CyClING (CONTINUED)
SEQUENCE Of OPERATION
VENT-TIMED, HVAC INITIATES VENTIlATION
• Ventilation will occur whenever there is an HVAC fan (Gs) or heat (W) call and will continue until the ventilation time has met the set Cycle
Time.during.the.set.Cycle.Period .During.ventilation.the.dehumidifier.damper.output.turns.on,.the.ventilation.damper.opens,.the.dehumidifier.
blower.turns.on,.and.the.Status.LED.flashes
• When the HVAC heat or fan call has ended or when the ventilation time requirement has been met, the dehumidifier damper output turns off,
the.ventilation.damper.closes,.and.the.dehumidifier.blower.turns.off.along.with.the.green.Status.LED
• Two minutes must elapse following the end of a HVAC fan or heat call before the dehumidifier can initiate a ventilation cycle.
VENT-TIMED, DEHUMIDIfIER INITIATES VENTIlATION
• When the amount of time remaining in the Cycle Period is equal to the amount of Cycle Time required, the HVAC fan turns on, the
dehumidifier.damper.output.turns.on,.the.ventilation.damper.opens,.the.dehumidifier.blower.turns.on,.and.the.Status.LED.flashes
• When the ventilation time requirement has been met, the HVAC fan turns off, the dehumidifier damper output turns off, the ventilation damper
closes,.and.the.dehumidifier.blower.turns.off.along.with.the.green.Status.LED
• To prevent short cycling the fan, a ventilation cycle will not start unless there are at least 2 minutes remaining in the Cycle Period.
DEHUMIDIfICATION DURING VENTIlATION
When not controlled by the Model 70 living Space Control or third-party control,.the.dehumidifier.will.continually.measure.the.
conditions.of.the.incoming.air.during.ventilation
• The dew point of the air is measured 3 minutes after the dehumidifier blower is turned on and every 15 seconds while the blower is running.
• If the dew point of the air is above the setting on the control knob, the compressor turns on and the green Status LED switches to solid
illumination
• When the dew point of the air falls below the control knob set point, the compressor turns off and the Status LED flashes.
VENT-AUTO
Ventilation.in.the.Vent-Auto.configuration.is.functionally.the.same.as.Vent-Timed.operation,.with.the.exception.of.the.temperature.limits.applied.
to.the.incoming.air
• If the incoming air temperature is greater than or equal to 100°F, the ventilation damper closes. If the temperature drops to 95°F or lower
during.the.same.ventilation.cycle,.the.ventilation.damper.will.open
• If the incoming air temperature is less than or equal to 0°F, the ventilation damper closes. If the temperature increases to 5°F or higher during
the.same.ventilation.cycle.and.the.ventilation.cycle.was.initiated.by.a.HVAC.heat.(W).call,.the.ventilation.damper.will.open
• If the air temperature is less than or equal to 20°F and above 0°F, the ventilation damper will close unless a HVAC heat (W) call is initiated
during.the.ventilation.cycle .If.the.air.temperature.drops.to.0°F.or.below.during.the.same.ventilation.cycle,.the.ventilation.damper.closes .If.
the.temperature.rises.to.25°F.or.higher.during.the.same.ventilation.cycle,.the.ventilation.damper.will.open
15
Download from Www.Somanuals.com. All Manuals Search And Download.
MODEl 70 lIVING SPACE CONTROl
The Model 70 Living Space Control contains its own sensors that override the main control sensors on the dehumidifier. The purpose of utilizing
the.Model.70.is.to.have.the.dehumidifier.control.located.in.a.living.area,.where.the.homeowner.can.monitor.and.control.humidity.levels .Once.
connected and powered, the Model 70 is automatically recognized by the dehumidifier and will continuously communicate the air conditions
and.the.dew.point.setting.to.the.dehumidifier.control .No.sampling.is.needed.when.using.a.Model.70.because.the.control.is.located.in.the.
space.to.be.conditioned.and.is.measuring.the.dew.point.in.that.space .Refer.to.the.Model.70.Installation.Instructions.for.location.and.mounting.
instructions .The.Convertible.configuration.is.not.available.with.the.Model.70.Living.Space.Control ..
WIRING & DIP SWITCH CONfIGURATION
fIGURE 25 – Model 70 Wiring
fIGURE 26 – Model 70 DIP Switch Configuration
DEHUMIDIFIER
CONTROL BOARD
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
90-1538
MODEL 70
A
B
+
-
90-1537
SEQUENCE Of OPERATION
Whole-Home
• There is a 6 minute delay upon power up or after cycling power.
• If the dew point of the air is above the dew point setting on the Model 70, the dehumidifier damper output turns on, the dehumidifier blower
turns.on,.and.the.green.Status.LED.flashes
• Three seconds after the dehumidifier blower turns on, the compressor turns on, and the green Status LED switches to solid illumination.
• When the dew point falls below the dew point setting on the Model 70, the dehumidifier damper output turns off and the dehumidifier
compressor.and.blower.turn.off.along.with.the.green.Status.LED .
16
Download from Www.Somanuals.com. All Manuals Search And Download.
THIRD-PARTy CONTROl
An.external.thermostat.with.dehumidifier.connections.can.be.used.as.an.ON/OFF.dehumidifier.control .In.this.configuration,.the.third-party.
control.initiates.dehumidification.and.overrides.the.on-board.dehumidifier.control.logic .The.dehumidifier.control.knob.can.only.be.used.to.initiate.
Test.Mode.when.a.third-party.control.is.used .The.Convertible.configuration.is.not.available.with.a.third-party.control ..
WIRING & DIP SWITCH CONfIGURATION
fIGURE 27 – Third-Party Control Wiring
fIGURE 28 – Third-Party DIP Switch Configuration
DEHUMIDIFIER
CONTROL BOARD
SYSTEM SETUP
LOCAL
HVAC FAN OFF
WHL HOUSE
VENT-AUTO
EXTERNAL
HVAC FAN ON
CONVERTIBLE
VENT-TIMED
THIRD-PARTY CONTROL
90-1538
THERMOSTAT
HVAC EQUIPMENT
R
C
G
R
C
Wiring Notes:
The.dehumidifier.Rf.and.Cf.terminals.must.be.powered.from.the.
transformer.that.powers.the.third-party.control
G
W
Y
W
Y
Third-Party Control with 2 Dehumidifier Connections
Deh
Deh
1 .C. onnect.one.thermostat.dehumidifier.terminal.to.the.Rf.terminal.on.
the.dehumidifier.control.board .
2 ..Connect.the.other.thermostat.dehumidifier.terminal.to.the.DH.
terminal.on.the.dehumidifier.control.board
Third-Party Control with 1 Dehumidifier Connection
NOTE: Deh output(s) must
be normally open.
Connect.the.thermostat.dehumidifier.terminal.to.the.DH.terminal.on.
the.dehumidifier.control.board
90-1537
SEQUENCE Of OPERATION
• When the third-party control makes a dehumidification call, the dehumidifier damper output turns on, the dehumidifier blower turns on, and
the.green.Status.LED.flashes
• After 3 seconds the compressor turns on and the green Status LED switches to solid illumination.
• When the third-party control ends a dehumidification call, the dehumidifier damper output turns off and the dehumidifier blower and
compressor.turn.off.along.with.the.green.Status.LED
17
Download from Www.Somanuals.com. All Manuals Search And Download.
SySTEM CHECKOUT
DEHUMIDIfICATION
1 ..Check.the.wiring.to.the.HVAC.equipment.and.any.accessories.if.applicable
2 ..Plug.unit.in.and.turn.on/off.switch.to.ON
fIGURE 29 – Control Knob Setpoint
3 ..Rotate.the.main.control.knob.clockwise.to.the.TEST.position
4 ..If.set.up.correctly,.the.dehumidifier.blower.will.turn.on.and.the.dehumidifier.damper.
output.will.turn.on .After.30.seconds.the.dehumidifier.compressor.will.turn.on .The.blower.
and.compressor.will.remain.on.for.1.minute.in.TEST.mode .After.1.minute.has.elapsed,.
the.dehumidifier.blower.and.compressor.will.turn.off.and.the.dehumidifier.damper.output.
will.turn.off .NOTE:.If.the.minimum.off.time.for.the.compressor.has.not.expired.when.
the.test.mode.is.initiated,.the.compressor.will.not.turn.on.until.the.minimum.off.time.has.
been.met .If.the.blower.or.compressor.fails.to.turn.on,.refer.to.the.Troubleshooting.Guide .
90-1327
5 ..The.Status.LED.will.blink.red.and.green.alternately.if.the.control.knob.has.been.left.in.
TEST.after.the.compressor.has.turned.off
ADJUSTING DEHUMIDIfIER SET POINT
1 ..Use.the.control.knob.on.the.unit.to.set.the.desired.dryness.level
• Based on indoor temperature, use Table 6.to.determine.the.control.knob.setting.to.achieve.the.desired.humidity.level
• For most installations, start with a setting in the NORMAL range. See figure 29
• Moving the knob clockwise towards MORE will increase dehumidifier run time, allowing for lower humidity levels.
• Moving the knob counterclockwise towards LESS will decrease dehumidifier run time, allowing for higher humidity levels.
2 ..Reference.Model.70.Living.Space.Control.or.Third-Party.Control’s.Installation.Instructions.for.start-up.with.a.separate.control ..
Note:.There.is.a.6.minute.delay.after.power.up.when.using.a.Model.70 .
TAblE 6 – %RH ( 5%) based on Control Knob Setting & Indoor Temperature
EXAMPlE:.At.an.indoor.temperature.of.75°f.
and.a.control.knob.setting.of.3 (56°f DP),.
the.dehumidifier.will.work.to.achieve.a.53%.
Indoor Temperature
Control Knob Setting
& Dew Point
65°f
70°f
84%
73%
63%
54%
46%
39%
34%
75°f
71%
61%
53%
45%
39%
33%
28%
80°f
60%
52%
45%
39%
33%
28%
24%
humidity.level
1.–.Less,.65°F.DP
2.–.60°F.DP
• The %RH values are ± 5% and are to be
used.as.a.GUIDE ONly.for.initial.set-up
86%
74%
64%
55%
47%
40%
3.–.Normal,.56°F.DP
4.–.Normal,.52°F.DP
5.–.Normal,.48°F.DP
6.–.44°F.DP
• Indoor temperature is measured at the inlet
to.the.dehumidifier
7.–.More,.40°F.DP
VENTIlATION
1 ..Verify.24.VAC.is.applied.in.series.with.the.normally-closed.damper.and.connected.to.the.VENT.
DAMPER.terminals.on.the.dehumidifier.control.board
fIGURE 30 – Ventilation Test
2. Remove the control door and rotate the CYCLE TIME potentiometer clockwise to the TEST position.
VENTILATION TEST
See figure 30
30
MIN.
3 ..If.set.up.properly,.the.HVAC.blower.will.turn.on.and.the.ventilation.damper.will.open .The.HVAC.
blower.will.remain.on.and.the.ventilation.damper.will.remain.open.for.1.minute.or.until.the.dial.
is.turned.from.the.TEST.position .DO NOT leave CyClE TIME set to TEST..If.the.HVAC.blower.
fails.to.turn.on.or.the.damper.fails.to.open,.refer.to.the.Troubleshooting.Guide
0
60
MIN
MIN.
OFF
TEST
CYCLE TIME
90-1538
18
Download from Www.Somanuals.com. All Manuals Search And Download.
TROUblESHOOTING
Technical.Support.is.available.Monday.through.Friday,.7:00.a m .to.5:00.p m .CST,.at.(800).334-6011 .Use.the.guides.on.the.following.pages.to.
help.find.and.correct.system.faults .Contact.Technical.Support.before.replacing.the.unit.or.components.or.for.additional.troubleshooting .
lED CODES
The.dehumidifier.control.board.uses.the.Status.LED.to.communicate.
TAblE 7 – Green lED Codes
current.status.or.a.fault.code .Faults.can.be.either.critical.or.non-
Activity
Status
critical .When.a.critical.fault.is.detected,.the.red.LED.will.flash.the.
fault.code.and.all.outputs.will.immediately.turn.off .A.critical.fault.
can.be.cleared.by.repairing.the.fault.and.cycling.power.or.turning.
the.control.knob.to.OFF .When.a.non-critical.fault.is.detected,.the.
red.LED.will.flash.the.fault.code.and.the.dehumidifier.will.revert.to.
limited.operation .A.non-critical.fault.will.be.cleared.when.the.fault.is.
repaired .Cycling.power.is.not.required.to.revert.back.to.full.operation .
Solid.ON
Compressor.ON
Sampling
Blinking.1.sec .ON.&.1.sec .OFF
Blinking.1/2.sec .ON.&.1/2.sec .OFF
Alternating.Green.&.Red
Defrosting
Test.Mode
TAblE 8 – Red lED Codes
Number
fault Type
failure Mode failure Condition
Action
of blinks
1
Critical
Internal.RH.
sensor.fault
RH.sensor.non-existant,.erratic.or.reads.out. 1 ..Check.connection.between.sensor.board.and.control.board
of.0% –100%.range
2 ..If.connection.okay,.call.Technical.Support
Temperature.sensor.non-existent,.erratic.or. 1 ..Check.connection.between.sensor.board.and.control.board
2
3
Critical
Critical
Internal.
temperature.
sensor.fault
reads.out.of.-20°F –150°F.range
2 ..If.connection.okay,.call.Technical.Support
Model.70.
Model.70.not.communicating.with.
1 ..Check.connections.between.Model.70.and.control.board
communication. dehumidifier.control.board
error
2 ..If.connections.okay,.turn.off.the.dehumidifier.and.remove.
the.Model.70 .Use.a.short.section.of.4-wire.cable.to.
reconnect.the.Model.70.to.the.control.board .Turn.the.
dehumidifier.back.on.and.increase.the.dryness.setting.on.
the.Model.70 .If.the.dehumidifier.turns.on,.the.problem.is.
with.the.wiring.installed.between.the.dehumidifier.and.the.
Model.70
3 ..If.the.above.does.not.fix.the.problem,.call.Technical.
Support
4
Critical
Insufficient.
capacity
After.120.minutes.of.compressor.operation,. 1 ..Check.the.frost.sensor.connection.at.the.control.board
the.frost.sensor.temperature.is.not.at.least.
10°F.below.the.inlet.air.temperature
2 ..Remove.the.side.panel.(when.facing.side.of.unit,.on/off.
switch.will.be.on.left).and.verify.the.temperature.sensor.is.
not.damaged,.is.fully.inserted.in.the.sensor.well,.and.the.
well.is.filled.with.thermal.paste
3 ..If.the.sensor.is.not.damaged.and.positioned.correctly,.
contact.Technical.Support
5
6
Non-Critical
Critical
Inlet.air.
Internal.temperature.sensor.reads.out.
1 ..Circulate.air.through.the.unit.by.setting.the.Cycle.Period.to.
1.hour.and.Cycle.Time.to.60.minutes .After.a.minimum.of.
10.minutes,.cycle.power.to.the.dehumidifier
temperature.out. of.50°F –105°F.range.for.compressor.
of.range
operation .NOTE:.If.compressor.is.on.when.
fault.condition.occurs,.the.compressor.will.
turn.off .If.the.compressor.is.not.on.when.
the.fault.condition.occurs,.there.is.no.fault
2 ..If.fault.persists,.call.Technical.Support
Frost.sensor.
failure
Frost.temperature.sensor.nonexistent,.
erratic.or.reads.out.of.-20°F –150°F.range
1 ..Check.the.frost.sensor.connection.at.the.control.board
2 ..Remove.the.side.panel.(when.facing.side.of.unit,.on/off.
switch.will.be.on.left).and.verify.the.temperature.sensor.is.
not.damaged,.is.fully.inserted.in.the.sensor.well,.and.the.
well.is.filled.with.thermal.paste .
3 ..If.the.fault.persists,.contact.Technical.Support
7
Non-Critical
Float.switch.
open
Open.circuit.between.float.switch.inputs
1 ..Empty.the.condensate.pan
2 ..Check.the.float.switch.connection.at.the.control.board
3 ..If.not.using.float.switch,.verify.jumper.is.between.float.
switch.terminals.on.dehumidifier.control.board
4 ..If.the.problem.persists,.replace.the.float.switch
19
Download from Www.Somanuals.com. All Manuals Search And Download.
TROUblESHOOTING (CONTINUED)
TAblE 9 – Troubleshooting Guide
Symptom
Possible Reason
Troubleshooting Procedure
Dehumidifier.does.
not.turn.on/run
No.power.to.unit
• Check that the dehumidifier is plugged in.
• Check that the power switch on the dehumidifier is ON.
• Check that control knob is set to a dryness level number.
• Check that the circuit breaker has not tripped. The 1750A requires a minimum of 8 amps and
the.1770A.requires.a.minimum.of.14.amps
Dehumidifier.blower. Pressure.drop.across.dehumidifier. • Check dehumidifier air filter and wash or replace.
is.running.but.little.or. is.higher.than.0 8”w c .(1750A).or.
no.airflow 1 5”w c .(1770A)
• Check for blocked duct work and clear.
• Check if back flow damper is blocked or stuck and remove obstruction.
Dehumidifier.blower. Float.switch.open
is.running.but.
compressor.is.not
• If float switch installed, check connections at control board and empty condensate pan.
• If no float switch installed, check that the jumper is installed at the float switch terminals on
control.board
Coil.frosting
• Lack of, or reduced airflow. Check/clean filter and check for blocked duct work.
• Inlet air conditions below 60°F. Use the control knob to turn down the dryness setting.
The.dehumidifier.
damper.does.not.
open.in.TEST.Mode
Incorrect.damper.wiring.or.bad.
connection
• Verify wiring between dampers and 24 VAC transformer.
• If wired for Convertible operation, verify that 24 VAC transformer is 40 VA minimum.
• Check all wiring connections between dampers and control board.
HVAC.fan.does.not.
turn on when CYCLE
TIME.potentiometer.
is.turned.to.TEST
No.power.to.HVAC.equipment
No.power.to.dehumidifier
• Verify there is power to the HVAC equipment.
• Check the voltage across the R & C terminals on the dehumidifier control board. Voltage
should.be.18.VAC – 30.VAC
Incorrect.wiring
• Verify wiring and connections between the thermostat, HVAC, and dehumidifier.
HVAC.fan.operates.
continuously.after.
control.knob.is.
HVAC.call.or.constant.fan
• HVAC equipment is making a call.
• The HVAC fan is set to constant ON.
Dehumidifier.air.cycling/ventilation. • If the Cycle Time is equal to or greater than the Cycle Period, HVAC fan operation will be
set.to.constant.ON
moved.out.of.TEST
continuous
• Reduce the Cycle Time if constant fan is not desired.
The.ventilation.
damper.does.not.
open.when.the.HVAC.
fan.is.active
Cycle.time.met
• The damper will not open if the Cycle Time has already been met.
ODT.error.or.inlet.air.out.of.
temperature.range
• Check that the ODT is wired correctly to
dehumidifier.control.board.and.connections.are.
secure
Outdoor
Resistance
Temperature
0°F
84,500.OHMS
46,000.OHMS
26,000.OHMS
15,500.OHMS
9,500.OHMS
6,000.OHMS
• Check that ODT is installed in the outdoor air
intake.according.to.set-up.in.Ventilation.Section.
starting.on.page.12
• Remove the ODT leads from the dehumidifier
control.board.and.check.the.resistance .Compare.
the.reading.with.the.table.at.right
20°F
40°F
60°F
80°F
100°F
Dehumidifier.is.not.
draining.properly
Drain.line.or.drain.trap.blocked
• Check that the drain trap is installed correctly.
• Check the drain trap and drain line for blockage by slowly pouring one pint of water into the
dehumidifier.drip.pan.located.below.the.coil
• Check drain line for continuous downward slope.
The.HVAC.fan.turns. Sampling.or.air.cycling
on.unexpectedly
• Dehumidifier will turn on HVAC fan during sampling and as needed to meet air cycling or
ventilation.requirements.as.determined.by.the.Cycle.Period.and.Cycle.Time
Dehumidifier.is.
producing.hot.air
Normal.function
• Air is reheated across the condenser coil, resulting in a temperature rise between inlet and
outlet
P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011.• Fax: 608/257-4357 • www.aprilairepartners.com
10009174...10 10
B2205271A
Printed.in.U S A
©.2010.Aprilaire.–.A.division.of.Research.Products.Corporation
Download from Www.Somanuals.com. All Manuals Search And Download.
|