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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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 .__________
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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
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