Aprilaire 8353 User manual

1
Installation Guide
IMPORTANT SAFETY INFORMATION WARNING:
•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.
•Read all of the information in this manual before installing or
programming this thermostat.
•This is a 24V AC low-voltage thermostat. Do not install on voltages
higher than 30V AC.
•All wiring must conform to local and national building and electrical
codes and ordinances.
•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.
5-2 Day Programmable
1 Heat / 1 Cool
Electric / Gas
MODEL 8353
User’s Manual
Installation and
Programming
ELECTRONIC THERMOSTATS
®

Features
• Four setpoints for weekday programming—two setpoints for
weekend comfort.
• Two “AA” ENERGIZER brand batteries retain program memory,
even during power outages.
• Low battery indicator.
• Fahrenheit/Celsius display option.
• Programmable from 45°F (4°C) to 90°F (32°C).
• Accuracy within ± 1 degree.
• Adjustable temperature differential: 1-3 degrees.
• Maintains summer and winter programming.
• 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.
• Automatic heating shutdown if temperature exceeds 90°F (32°C).
Replacing Existing Thermostat
1. Turn off power to heating and cooling system.
2. Remove cover of old thermostat to expose wires. Do not
disconnect wires. (Fig. 1)
3. Label wires per Table 1.
Table 1
Old Label New Label Description
M, 4, RH, R5 or R RH Heat Transformer,
hot side
V or RC RC Cooling Transformer, hot
side
Y or Y6 Y Cooling control
H, W or 4 W Heating control
F or G G Fan control relay
C* Y or None Either cooling control or
common side of trans-
former
*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.
4. After labeling wires, remove wires from terminals.
5. Remove existing thermostat base from wall.
6. Refer to the following section for instructions on how to
install thermostat.
2

Figure 1
Installing the Model 8353 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.
1. Turn power off to the heating and cooling systems.
2. Place COOL-OFF-HEAT In OFF position.
3. Place FAN: AUTO–ON switch
Into AUTO position.
4. Remove the cover using a coin
or screwdriver.
Figure 2
5. Place thermostat against the wall at desired location. Make sure
wires will feed through opening on base of thermostat.
6. Mark placement of mounting holes. See Fig. 3. Set base aside.
3
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>
COOL-OFF-HEAT
FAN: AUTO-ON

Figure 3
7. Drill the marked holes using a 3/16” drill bit. Note: Enclosed plastic
anchors do not require a drilled hole for drywall.
8. Tap plastic anchors into the wall.
9. Align base with plastic anchors and feed wires through opening.
See Fig 4.
Figure 4
10. Secure base to wall with supplied screws.
11. Connect wires to terminal strip. Refer to wiring diagrams on other
side of this sheet. Make sure wire connections are secure.
12. Place fan option switch into either the “ELEC” or “GAS” position
depending upon the type of furnace. Refer to Figure 5.
Figure 5
4
PROG
MAN
CHANGE SET AUTO/MAN
Elec
Gas
RH
AM
PM
MORN DAY EVE NITE
RC
W
Y
G
FAN AUTO ON
MOUNTING HOLES
COOL OFF HEAT
PROG
MAN
CHANGE SET AUTO/MAN
Elec
Gas
RH
AM
PM
MORN DAY EVE NITE
RC
W
Y
G
FAN AUTO ONCOOL OFF HEAT
PROG
MAN
CHANGE SET AUTO/MAN
Elec
Gas
RH
AM
PM
MORN DAY EVE NITE
RC
W
Y
G
FAN AUTO ON
FAN
OPTION
SWITCH
Controls
fan delay.
COOL OFF HEAT

13. 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. The
display will show as follows:
14. Replace cover onto thermostat by snapping into place.
15. Turn on power to system . Test thermostat as described in the
following section.
Programming Guide
Set Time of Day, Day of Week,
Temperature Differential
1. Press & Hold SET. Press PROG/MAN
Release simultaneously.
2. Press or to change
Time of Day.
3. Press 4. Press
To Change
Day of Week
5
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>
SET PROG/MAN
>
>
SET P
>
>
1=MO
2=TU
3=WE
4=TH
5=FR
6=SA
7=SU
>
>

5. Press 6. Press
To change
Temperature Differential*
*The Temperature Differential is Factory preset at 1°. This means that
whenever the room temperature changes by one full degree from the
temperature setting, the system will turn on. If the system turns on too
often, increase the temperature differential.
7. Press SET to finish.
Changing Fahrenheit (F) to Celsius (C)
Press and Hold SET Press
Release both simultaneously.
Setting Daily Programming
1. Place COOL-OFF-HEAT switch
in COOL position.
2. Press SET.
3. Press or to change
MORN time in 30-minute
intervals.
6
SET P
>
>
SET
P
>
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>
COOL-OFF-HEAT
SET PR
>
>
>
>

4. Press SET.
5. Press or to change
MORN temperature.
6. Repeat Steps 2-5 for DAY, EVE, and NITE.
7. Press SET to finish.
8. Shift COOL-OFF-HEAT switch to
HEAT position.
9. Repeat steps 2-7 to program HEAT (winter) settings.
NOTE: Both summer and winter programs use the same time settings.
Your thermostat is now programmed for summer and winter operation.
It will follow the four settings (MORN, DAY, EVE, NITE) for weekday
operation and two settings (MORN and NITE) for weekend operation.
Adjust the program at any time by following the steps as outlined above.
Begin Programmed Operation
1. Place FAN: AUTO–ON switch
Into AUTO.
2. Place COOL-OFF-HEAT switch
Into COOL or HEAT
Depending upon the season.
3. Press PROG/MAN button
until indicator is in PROG position.
7
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>
SET PR
>
>
COOL-OFF-HEAT
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>
FAN: AUTO-ON
COOL-OFF-HEAT
COOL-OFF-HEAT
SUMMER
WINTER
ET PROG/MAN
PROG
MAN
>
>
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>

Temporary Program Override
To temporarily increase or decrease temperature
Press or
The thermostat will automatically return
to the program at the next scheduled
setting change or after four hours.
Manual Operation
Manual operation allows continuous override of the program settings.
1. Press PROG/MAN until indicator is in MAN position.
2. Press or to adjust
temperature settings.
Reset
To reset the thermostat to factory pre-programmed
conditions, press the reset button located directly
to the right of the display.
8
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
>
>
>
>
>
>
PROG
MAN
SET PROG/MAN COOL-OFF-HEAT FAN: AUTO - ON
T PROG/MAN
PROG
MAN
>
>
PROG
MAN
CHANGE SET AUTO/MAN
Elec
Gas
RH
AM
PM
MORN DAY EVE NITE
RC
W
Y
G
FAN AUTO ON
RESET
BUTTON
COOL OFF HEAT
>
>
>
>

To Test Thermostat
WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS
VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAM-
AGE THE THERMOSTAT AND VOID YOUR WARRANTY.
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.
1. Place the COOL-OFF-HEAT
switch into the COOL position
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.
NOTE: There is a built in 5-minute delay on break for compressor
protection. A second attempt to turn on the air conditioning will
result in a 5-minute delay in compressor activation.
3. Put the COOL-OFF-HEAT switch into
the OFF position. The air conditioning
system should turn off. The fan may
continue to run for a short period of time.
4. Put the COOL-OFF-HEAT switch
into the HEAT position.
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. Once again,
the fan may have a delay.
7. Put the FAN: AUTO–ON switch
to the ON position. The blower
fan should turn on.
8. Put the FAN: AUTO–ON switch
to the AUTO position. The blower
fan should turn off.
9
COOL-OFF-HEAT
COOL-OFF-HEAT
COOL-OFF-HEAT
FAN: AUTO - ON
FAN: AUTO-ON
COOL-OFF-HEAT
>
>

Troubleshooting
Symptom Remedy
Thermostat does not turn Check Wiring
on system (see INSTALLATION).
Check fuse. Replace with 2 amp
Slo-Blo fuse if fuse has opened.
Thermostat turns on and off too Increase Temperature Differential
frequently. (see PROGRAMMING).
Display is blank, flashing or Replace batteries.
constant “LO BAT.”
Weekend Program follows four Verify that day of week is set
adjustment settings. correctly (see PROGRAMMING).
System fan does not operate Move fan option switch to either
properly. gas or electric, to match system
(see INSTALLATION).
Time shown on display is not the Change time of day setting
current time of day. (see PROGRAMMING).
Thermostat does not Thermostat in MANUAL mode
follow program. (see PROGRAMMING).
Thermostat may not have been
programmed in HEAT or COOL
position. Verify program.
Check AM/PM indicators at time
of day and programmed time
changes (see PROGRAMMING).
Verify program and day of week
is correct (see PROGRAMMING).
If problems with thermostat cannot be solved, call:
Technical Support: 608-257-8801
Monday-Friday 7:45 am - 5:00 pm CST
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