Aprilaire 8334 Thermostat User Manual

Features
4. After labeling wires, remove wires from terminals.
• Single Stage heat pump compatible.
5. Remove existing thermostat base from wall.
• Zone system compatible as a master thermostat.
6. Refer to the following section for instructions on how to
install thermostat.
• Low battery indicator.
ELECTRONIC THERMOSTATS
MODEL 8334
• Adjustable from 45(F (4°C) to 90°F (32(C).
Installing Model 8334 Thermostat
• Accuracy within ± 1 degree.
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.
• 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 Heat / 1 Cool Digital
Electric / Gas
• Automatic heating shutdown if temperature exceeds 90°F (32°C).
User’s Manual
HP/NON HP
Switch
8. Tap plastic anchors into the wall.
1. Turn off power to heating and cooling system.
COOL OFF HEAT
2. Remove cover of old thermostat to expose wires.
Do not disconnect wires. (Fig. 1)
COOL OFF HEAT
Old Label
New Label
15. Install two “AA” ENERGIZER brand batteries or equivalent into battery compartment. Be sure to match positive (+) ends of batteries
with positive (+) battery terminals in the battery compartment.
9. Align base with plastic anchors and feed wires
through opening.
10. Secure base to wall with supplied screws.
FAN: AUTO - ON
11. Connect wires to terminal strip. Refer to wiring diagrams on other
side of this sheet. Make sure wire connections are secure.
Table 1
Description
M, 4, RH, R5 or R
RH
Heat Transformer,
hot side
3. Place FAN: AUTO-ON switch
Into AUTO position.
V or RC
RC
Cooling Transformer,
hot side
4. Remove the cover using a coin
or screwdriver.
Y or Y6
Y
Cooling control
IMPORTANT SAFETY INFORMATION
H, W or 4
W
Heating control
WARNING:
F or G
G
FAN: AUTO - ON
12. Place fan option switch into either the "ELEC" or "GAS" position
depending upon the type of furnace. Refer to Figure 4.
16. Replace cover onto thermostat by snapping into place.
ELECTRIC/
GAS SWITCH
17. Turn on power to system. Test thermostat as described in
the following section.
Fan control relay
• 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.
C*
Y or None
Either cooling control
or common side
of transformer
• Read all of the information in this manual before installing or
programming this thermostat.
O
O
Cool Active Reversing
Valve
• This is a 24V AC low-voltage thermostat. Do not install on voltages
higher than 30V AC.
B
B
Heat Active Reversing
Valve
• 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.
MOUNTING HOLES
7. Drill the marked holes using a 3/16" drill bit. NOTE: Enclosed plastic
anchors do not require drilled hole for drywall.
2. Place COOL-OFF-HEAT
In OFF position.
Replacing Existing Thermostat
3. Label wires per Table 1.
• All wiring must conform to local and national building and electrical
codes and ordinances.
14. Put the HP/NON HP switch to either the HP for Heat Pump or NON
HP for furnace applications in the proper position.
1. Turn power off to the heating
and cooling systems.
>
Installation and
Operation
6. Mark placement of mounting holes. See Fig. 3.
Set base aside.
• Fahrenheit/Celsius display option.
>
®
*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.
If it is the cooling control, connect
to the Y terminal.
Figure 2
figure 4
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.
°F/°C
F°/°C
SWITCH
Switch
Figure 1
1
2
3
4
5
Changing Fahrenheit (F) to Celsius (C)
Wiring Diagrams
WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS
VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAMAGE
THE THERMOSTAT AND VOID YOUR WARRANTY.
Setting or Changing the Setpoint Temperature
1. Press either the
or
button.
The display will show the current
temperature setpoint.
The thermostat is preset to display the temperature in degrees
Fahrenheit. You may change the display readout to Celsius if desired.
1. Move the manual switch marked “F” (Fahrenheit) and “C” (Celsius)
located at the top center of the circuit board to the desired setting.
The following is just a sample of the most common types of HVAC systems.
Refer to your systems installation manual for wiring information.
CAUTION: Do not switch system to cool if the temperature is below
50°F (10°C). This can damage the air conditioning system and cause
personal injury.
>
>
2. Press RESET button located lust below the LCD display to register
the change.
The display will change to show the temperature in your desired
temperature scale. To return the thermostat to its original setting,
repeat steps 1 and 2 above.
COOL OFF HEAT
COOL OFF HEAT
>
>
1. Place the COOL-OFF-HEAT switch
into the COOL position
>
Operation
>
To Test Thermostat
FAN: AUTO - ON
>
>
8. Put the FAN: AUTO-ON switch to
the AUTO position. The blower fan
should turn off.
RH
Transformer
RC
Hot
120 VAC
24 VAC
Heating
Control
W
Cooling
Control
Y
Fan
Control
G
Thermostat does not turn
on system
Check Wiring
(see INSTALLATION).
Check fuse. Replace with 2 amp
fuse if fuse has opened.
Thermostat turns on and
off too frequently.
Increase Temperature Differential
(see DIFFERENTIAL).
Display is blank, flashing
or constant “LO BAT”.
Replace batteries.
System fan does not
operate properly.
Move fan option switch to either
gas or electric, to match system
(see INSTALLATION).
FAN: AUTO - ON
The display will show:
FAN: AUTO - ON
Check “F” Fahrenheit/”C” Celsius
switch located at top center of
circuit board for proper position.
If a new selection is made, press
“RESET” button located directly
below LCD display.
FAN: AUTO - ON
2. Press either the
or
button
to adjust the temperature
differential up or down.
RH
Transformer
Hot
120 VAC
RC
24 VAC
Heating
Control
W
Fan
Control
G
Y
T
H
E
R
M
O
S
T
A
T
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
Transformer
Hot
120 VAC
RC
24 VAC
Heating
Control
W
Y
G
T
H
E
R
M
O
S
T
A
T
RH
Transformer
Hot
120 VAC
RC
24 VAC
W
Cooling
Control
Y
Fan
Control
G
T
H
E
R
M
O
S
T
A
T
HEAT/COOL
5-WIRE
TWO TRANSFORMER
NOTE: Cut center of
factory installed jumper
and bend back
(HEATING)
Transformer
RH
24 VAC
120 VAC
RC
Hot
120 VAC
24 VAC
Heating
Control
W
Cooling
Control
Y
Fan
Control
G
T
H
E
R
M
O
S
T
A
T
Research Products Corporation’s exclusive obligation under this warranty
shall be to supply, without charge, a replacement for any thermostat which is
found to be defective within a two (2) year period and which is returned,
together with the date of installation, no later than thirty (30) days after said
two (2) year period by you to either your original supplier or to Research
Products Corporation, Madison, Wisconsin 53701.
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN
WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS
CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF.
NOTE: Remove factory
installed jumper
RH
Your Research Products Corporation Aprilaire® Thermostat unit is expressly
warranted for two (2) years from date of installation to be free from defects in
materials and workmanship.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID
TWO YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY
FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES
FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS
EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S)
RESULT FROM FAILURE TO HAVE THIS THERMOSTAT INSTALLED BY A
QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE
LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED
CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE
EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or
the exclusion or limitation of incidental or consequential damages, so the
above exclusion or limitations may not apply to you.
NOTE: Both transformers
must be in phase.
This warranty gives you specific legal rights and you may also have other
rights which vary from state to state.
(COOLING)
Transformer
>
COOL OFF HEAT
>
Thermostat does not display
proper room temperature.
COOL OFF HEAT
T
H
E
R
M
O
S
T
A
T
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
Hot
>
7. Put the FAN: AUTO-ON switch to
the ON position. The blower fan
should turn on.
>
5. Press the
button until the
temperature setting is at least
3 degrees above room temperature.
The heating system should turn on.
The fan may not turn on immediately,
depending upon the fan delay built
into the furnace.
6. Put the COOL-OFF-HEAT switch
into the OFF position. The heating
system should turn off. The fan may
continue to run for a short period
of time.
IMPORTANT: The temperature differential is factory set at 1 (.5°). This
means that whenever the room temperature changes by one half of a
degree from the temperature setting, the system will turn on. If the
system turns on too often, increase the temperature differential.
1. Press both
and
buttons
at the same time and hold for one
second.
Factory- Installed
jumper
Factory-Installed
jumper
Remedy
Changing Temperature Differential
>
COOL OFF HEAT
>
4. Put the COOL-OFF-HEAT switch
into the HEAT position.
COOL OFF HEAT
Symptom
HEAT ONLY
3-WIRE
SINGLE TRANSFORMER
HEAT/COOL
4-WIRE
SINGLE TRANSFORMER
TROUBLESHOOTING
The display will return to the room temperature display five seconds after
the last input and the new setpoint will be saved.
>
3. Put the COOL-OFF-HEAT switch
into the OFF position. The air
conditioning system should turn off.
2. Press either the
or
button
to adjust the temperature setting
either up or down.
>
NOTE: When in the COOL mode (or HEAT and COOL for single stage
heat pumps), once the thermostat turns off, a built in 5-minute delay
prevents the system from turning on again. This protects the compressor.
No additional time delay relay is required.
>
>
2. Press the
button until the
temperature setting is at least
3 degrees below the room temperature.
The air conditioning system should
turn on within a few seconds.
Limited Warranty
If problems with thermostat cannot be solved, call:
Technical Support: 608-257-8801
Monday-Friday 7:45 am-5:00 pm CST
Differential
Setting Degrees
1
1°F/.5°C
2
2°F/1.0°C
3
3°F/1.5°C
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
Transformer
Hot
120 VAC
RC
24 VAC
W
Fan
Relay
G
Compressor
Contactor
Y
Reversing
Valve
O
RH
T
H
E
R
M
O
S
T
A
T
Transformer
Hot
120 VAC
RC
24 VAC
W
Fan
Relay
Compressor
Contactor
G
Y
O
Reversing
Valve
B
The display will return to the room temperature
five seconds after the last input.
Pre-Installed jumper
Pre-Installed jumper
RH
NOTE: Installer must place jumper
between “W” and “Y” terminals.
T
H
E
R
M
O
S
T
A
T
B
P.O. BOX 1467 • MADISON, WI 53701-1467
Products For Better Indoor Air Quality ™
NOTE: Installer must place jumper
between “W” and “Y” terminals.
B2202515
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REV. 12/00
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