4. After labeling wires, remove wires from terminals.
5. Remove existing thermostat base from wall.
6. Mark placement of mounting holes. See Fig. 3.
Set base aside.
14. Put the HP/NON HP switch to either the HP for Heat Pump or NON
HP for furnace applications in the proper position.
Features
®
• Single Stage heat pump compatible.
MOUNTING HOLES
6. Refer to the following section for instructions on how to
install thermostat.
• Zone system compatible as a master thermostat.
• Low battery indicator.
HP/NON HP
Switch
ELECTRONIC THERMOSTATS
• Fahrenheit/Celsius display option.
• Adjustable from 45(F (4°C) to 90°F (32(C).
• Accuracy within 1 degree.
Installing Model 8334 Thermostat
NOTE: For new installations, mount thermostat on inside wall, 4-5 feet
above the floor. Do not install behind a door, in a corner, near air vents,
in direct sunlight, or near any heat or steam generating fixtures.
Installation at these places will affect thermostat operation.
• Adjustable temperature differential: .5 – 1.5 degree.
MODEL 8334
1 Heat / 1 Cool Digital
Electric / Gas
• Low temperature freeze protection. While in heat mode, thermostat
will mechanically turn on heat if temperature drops to 40°F (4°C) –
even if batteries are missing or drained.
1. Turn power off to the heating
and cooling systems.
• Automatic heating shutdown if temperature exceeds 90°F (32°C).
7. Drill the marked holes using a 3/16" drill bit. NOTE: Enclosed plastic
15. Install two “AA” ENERGIZER brand batteries or equivalent into bat-
tery compartment. Be sure to match positive (+) ends of batteries
with positive (+) battery terminals in the battery compartment.
2. Place COOL-OFF-HEAT
In OFF position.
Replacing Existing Thermostat
1. Turn off power to heating and cooling system.
anchors do not require drilled hole for drywall.
User’s Manual
Installation and
Operation
8. Tap plastic anchors into the wall.
COOL OFF HEAT
9. Align base with plastic anchors and feed wires
through opening.
2. Remove cover of old thermostat to expose wires.
Do not disconnect wires. (Fig. 1)
COOL OFF HEAT
FAN: AUTO - ON
10. Secure base to wall with supplied screws.
3. Label wires per Table 1.
11. Connect wires to terminal strip. Refer to wiring diagrams on other
side of this sheet. Make sure wire connections are secure.
Table 1
Old Label
New Label
Description
FAN: AUTO - ON
3. Place FAN: AUTO-ON switch
Into AUTO position.
12. Place fan option switch into either the "ELEC" or "GAS" position
depending upon the type of furnace. Refer to Figure 4.
M, 4, RH, R5 or R
RH
Heat Transformer,
hot side
4. Remove the cover using a coin
or screwdriver.
V or RC
RC
Cooling Transformer,
hot side
16. Replace cover onto thermostat by snapping into place.
17. Turn on power to system. Test thermostat as described in
the following section.
Y or Y6
H, W or 4
F or G
C*
Y
Cooling control
Heating control
Fan control relay
ELECTRIC/
GAS SWITCH
W
G
IMPORTANT SAFETY INFORMATION
WARNING:
Y or None
Either cooling control
or common side
of transformer
•
Always turn off power at the main power source by unscrewing
fuse or switching circuit breaker to the off position before installing,
removing, cleaning, or servicing thermostat.
O
B
O
B
Cool Active Reversing
Valve
• Read all of the information in this manual before installing or
programming this thermostat.
Figure 2
Heat Active Reversing
Valve
• This is a 24V AC low-voltage thermostat. Do not install on voltages
higher than 30V AC.
figure 4
• All wiring must conform to local and national building and electrical
codes and ordinances.
*NOTE: On some older models, the C terminal can be either the cooling
control or the common side of the transformer. Check furnace wiring
diagram to verify C terminal. If it is the common side of the transformer,
cap the wire and tuck into the wall.
5. Place thermostat against the wall at desired location. Make sure
wires will feed through opening on base of thermostat.
13. Put the °F/°C switch to either °F for Fahrenheit display
or °C for Celsius display readout.
• Do not short (jumper) across terminals on the gas valve or at the
system control to test installation. This will damage the thermostat
and void the warranty.
°F/°C
If it is the cooling control, connect
SWITCH
to the Y terminal.
Figure 1
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