11
Specifications and replacement parts
Operating Ambient Temperature
Thermostat:
32 to 120° F (0 to 48.9° C)
Operating Relative Humidity
Thermostat:
5% to 90% (non-condensing)
Physical Dimensions
(height, width, depth)
Thermostat:
4-15/16 x 4-5/8 x 1-1/8 inches (126 mm x 118 mm x 29 mm)
Electrical
ratings
Terminal
Voltage (50/60 Hz)
Max. Current Rating
W - OB
18 to 30 VAC and 750 mVDC
1.00A
Y (cooling)
18 to 30 VAC
1.00A
G (fan)
18 to 30 VAC
0.50A
W2 - Aux (heating)
18 to 30 VAC
0.60A
Y2 (cooling)
18 to 30 VAC
0.60A
A-L/A (output)
18 to 30 VAC
1.00A
U1/U1
30 VAC max.
0.50A
Accessories and replacement parts
Accessories / Replacement Parts
Part Number
Wired Outdoor Sensor 10k ohm NTC
C7089U1006
Wired Wall-mount Indoor Sensor 10k ohm NTC
C7189U1005
Wired Flush-mount Indoor Sensor 20k ohm NTC
C7772A1004, C7772A1012
Wired Wall-mount Indoor Sensor 20k ohm NTC
TR21
Wired Wall-mount Indoor Sensor 10k ohm NTC
TR21-A
Cover Plate (covers marks left by old thermostats)
THP2400A1019
Wire Saver Module
THP9045A1023
Model Numbering
TH8320
Stages
3H/2C HP
2H/2C CONV
Residential or Commercial
P
Dual Powered - C Wire or Battery
P
Onboard Humidity Sensor
P
Number of Universal Relays
1
Number of Universal Sensor Inputs
1
Economizer / TOD Output
P
DISCONNECT POWER BEFORE INSTALLATION.
Can cause electrical shock or equipment
damage.
This thermostat contains a Lithium battery which may contain Perchlorate material.
Perchlorate Material—special handling may apply. See local regulations.
MERCURY NOTICE:
If this product is replacing a control that contains mercury in a sealed
tube, do not place the old control in the waste.
Must be installed by a trained, experienced technician.
Read these instructions carefully.
Failure to follow these instructions can damage the product or cause a hazardous condition.