Honeywell TH8320U, TH8321U User Manual
TH8320U and TH8321U Touch Screen
Programmable Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
The TH8320U and TH8321U Touch Screen Universal Programmable Thermostats provide electronic control of 24 Vac heating and cooling systems or 750 mV heating system. See Table 1 for a general description.
Table 1. TH832 Thermostats Description.
Model |
Power |
Changeover |
System Selection |
Fan Selection |
Comments |
Method |
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TH8320U |
Batteries or |
Automatic or |
Heat-Off-Cool- |
On-Auto-Circ |
System and Fan selection |
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common wire |
manual |
Auto (Em. Heat for |
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vary based on system type |
TH8321U |
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selectable |
heat pumps) |
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System and Fan selection |
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vary based on System type. |
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Humidity sensor to control |
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dehumidification. |
MERCURY NOTICE
If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly.
Contact your local waste management authority for instructions regarding recycling and the proper disposal of the old control.
INSTALLATION
When Installing this Product...
1.Read these instructions carefully. Failure to follow the instructions can damage the product or cause a hazardous condition.
2.Check the ratings given in the instructions to make sure the product is suitable for your application.
3.Installer must be a trained, experienced service technician.
4.After completing installation, use these instructions to check out the product operation.
Selecting Location
Install the thermostat about 5 ft. (1.5m) above the floor in an area with good air circulation at average temperature. See Fig. 1.
NO
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YES |
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NO |
NO |
5 FEET |
[1.5 METERS]
M19925
Fig. 1. Selecting thermostat location.
® U.S. Registered Trademark |
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Copyright © 2004 Honeywell International Inc. • |
• All Rights Reserved |
69-1706
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
Do not install the thermostat where it can be affected by:
—Drafts or dead spots behind doors and in corners.
—Hot or cold air from ducts.
—Radiant heat from sun or appliances.
—Concealed pipes and chimneys.
—Unheated (uncooled) areas such as an outside wall behind the thermostat.
Installing Wallplate
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before wiring.
The thermostat can be mounted horizontally on the wall or on a 4 in. x 2 in. (101.6 mm x 50.8 mm) wiring box.
1.Position and level the wallplate (for appearance only).
2.Use a pencil to mark the mounting holes.
WALL
WIRES THROUGH WALL
AND WIRE SLOT
WALL ANCHORS (2)
MOUNTING
HOLES (2)
MOUNTING
SCREWS (2)
M19916
Fig. 2. Mounting wallplate.
3.Remove the wallplate from the wall and, if drywall, drill two 3/16-in. holes in the wall, as marked. For firmer material such as plaster, drill two 7/32-in. holes. Gently tap anchors (provided) into the drilled holes until flush with the wall.
4.Position the wallplate over the holes, pulling wires through the wiring opening. See Fig. 2.
5.Insert the mounting screws into the holes and tighten.
WIRING (FIG. 5-16)
All wiring must comply with local electrical codes and ordinances.
1.Select set of terminal identifications (Table 2) that corresponds with system type (conventional or heat pump in Fig. 3).
2.Loosen the screws for the appropriate system type selected; see Table 2. Insert wires in the terminal block under the loosened screw. See Fig. 4.
3.Securely tighten each screw.
4.Push excess wire back into the hole.
5.Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat.
HEAT PUMP
CONVENTIONAL
Y2 |
Y2 |
RC |
RC |
L |
|
R |
R |
E |
|
W |
O/B |
AUX |
W2 |
Y |
Y |
S1 |
S1 |
G |
G |
S2 |
S2 |
C |
C |
|
SCREW TERMINALS |
M19951 |
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Fig. 3. Selecting terminal identifications for system type.
Table 2. Selecting Terminal Identifications for System Type.
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Wallplate |
Wiring |
System Type |
Terminal |
Diagram |
Identifications |
Reference |
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Standard Heat/Cool |
Conventional |
5, 6 |
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Heat Only |
Conventional |
7 |
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Heat Only with Fan |
Conventional |
8 |
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Heat Only Series 20 |
Conventional |
9 |
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Cool Only |
Conventional |
10 |
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Standard Multistage |
Conventional |
11, 12 |
up to 2 Heat/2 Cool |
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Heat Pump with No |
Heat Pump |
13, 14 |
Auxiliary Heat |
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Heat Pump with |
Heat Pump |
15, 16 |
Auxiliary Heat |
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M19917
Fig. 4. Inserting wires in terminal block.
IMPORTANT
Use 18 gauge thermostat wire.
69-1706 |
2 |
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
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CONVENTIONAL |
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Y2 |
RC |
2 |
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R |
1 |
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W |
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R |
W2 |
Y |
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C |
S1 |
G |
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S2 |
C |
OPTIONAL |
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24 VAC |
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COMMON |
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CONNECTION |
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3 |
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FAN |
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OUTDOOR/INDOOR |
|
RELAY |
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TEMPERATURE |
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COMPRESSOR |
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SENSOR |
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CONTACTOR |
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HEAT RELAY
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER.
3OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE. |
M19895 |
Fig. 5. Typical hookup of conventional single-stage heat and cool system with single transformer (1H/1C conventional).
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CONVENTIONAL |
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Y2 |
RC |
2 |
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R |
1 |
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W |
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R |
W2 |
Y |
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C |
S1 |
G |
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S2 |
C |
OPTIONAL |
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24 VAC |
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COMMON |
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CONNECTION |
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3 |
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FAN |
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OUTDOOR/INDOOR |
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RELAY |
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TEMPERATURE |
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COMPRESSOR |
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SENSOR |
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CONTACTOR |
1 |
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HEAT RELAY |
C |
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R |
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2REMOVE FACTORY INSTALLED JUMPER.
3OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE. |
M19896 |
Fig. 6. Typical hookup of conventional single-stage heat and cool system with two transformers (1H/1C conventional).
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CONVENTIONAL |
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Y2 |
RC |
2 |
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R |
1 |
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W |
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R |
W2 |
Y |
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C |
S1 |
G |
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S2 |
C |
OPTIONAL |
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24 VAC |
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COMMON |
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CONNECTION |
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3 |
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HEAT RELAY |
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OUTDOOR/INDOOR |
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TEMPERATURE |
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SENSOR |
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1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
M19897
Fig. 7. Typical hookup of heat-only system (1H conventional).
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CONVENTIONAL |
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Y2 |
RC |
2 |
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R |
1 |
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W |
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R |
W2 |
Y |
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C |
S1 |
G |
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S2 |
C |
OPTIONAL |
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24 VAC |
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COMMON |
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CONNECTION |
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3 |
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FAN |
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OUTDOOR/INDOOR |
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RELAY |
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TEMPERATURE |
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SENSOR |
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HEAT RELAY |
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1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
M19898
Fig. 8. Typical hookup of heat only system with fan (1H conventional).
3 |
69-1706 |
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
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CONVENTIONAL |
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Y2 |
RC |
2 |
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R |
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1 |
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W |
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R |
W2 |
Y |
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C |
S1 |
G |
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S2 |
C |
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3 |
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OUTDOOR/INDOOR |
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W |
B |
R |
TEMPERATURE |
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SENSOR |
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SERIES 20 |
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MOTOR OR |
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TR |
TR |
VALVE |
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER.
3OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
M19899
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CONVENTIONAL |
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Y2 |
RC |
2 |
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R |
1 |
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W |
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R |
W2 |
Y |
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C |
S1 |
G |
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S2 |
C |
OPTIONAL |
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24 VAC |
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COMMON |
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CONNECTION |
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3 |
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FAN |
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RELAY |
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OUTDOOR/INDOOR |
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TEMPERATURE |
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COMPRESSOR |
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SENSOR |
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CONTACTOR |
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1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 FACTORY INSTALLED JUMPER.
3 OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE.
M19900
Fig. 10. Typical hookup of cool only system
(1C conventional).
Fig. 9. Typical hookup of heat only Series 20 system.
CONVENTIONAL |
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1 |
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R |
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Y2 |
RC |
C |
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R 2 |
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W |
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W2 |
Y |
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S1 |
G |
OPTIONAL 24 VAC |
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S2 |
C |
COMMON CONNECTION |
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MUST COME FROM |
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THE COOLING |
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TRANSFORMER. |
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OUTDOOR/INDOOR |
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FAN RELAY |
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TEMPERATURE |
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SENSOR |
COOL RELAY 2 |
COOL RELAY 1 |
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HEAT RELAY 2 |
HEAT RELAY 1 |
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1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER.
3OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST
HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE. |
M19901 |
Fig. 11. Typical hookup of conventional multistage two-stage heating and two-stage cooling in a single transformer system (2H/2C or 2H/1C or 1H/2C conventional).
69-1706 |
4 |
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
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CONVENTIONAL |
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1 |
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R |
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Y2 |
RC |
2 |
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C |
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R |
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W |
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W2 |
Y |
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S1 |
G |
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OPTIONAL 24 VAC |
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S2 |
C |
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COMMON CONNECTION |
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MUST COME FROM |
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THE COOLING |
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TRANSFORMER. |
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3 |
OUTDOOR/INDOOR |
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FAN RELAY |
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TEMPERATURE |
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1 |
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SENSOR |
COOL RELAY 2 |
COOL RELAY 1 |
R |
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C |
HEAT RELAY 2 |
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HEAT RELAY 1 |
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1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER REMOVED.
3OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABL SEPARATE FROM THE THERMOSTAT CABLE.
M19902
Fig. 12. Typical hookup of conventional multistage two-stage heating and two-stage cooling in a two-transformer system (2H/2C or 2H/1C or 1H/2C conventional).
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HEAT PUMP |
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1 |
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R |
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Y2 |
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RC |
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C |
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2 |
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L |
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R |
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E |
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O/B |
3 |
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AUX |
|
Y |
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SI |
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G |
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S2 |
|
C |
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OPTIONAL 24 VAC |
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COMMON CONNECTION |
4 |
OUTDOOR/INDOOR |
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FAN RELAY |
TEMPERATURE |
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SENSOR |
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CHANGEOVER |
COMPRESSOR |
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|||
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VALVE |
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1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER.
3"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
4OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
FROM THE THERMOSTAT CABLE. |
M19903 |
Fig. 13. Typical hookup of single-stage heat pump with no auxiliary/backup heat (1H/1C heat pump).
5 |
69-1706 |
TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
|
|
HEAT PUMP |
|
1 |
|
|
|
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|
|
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|
R |
|
Y2 |
|
RC |
C |
|
2 |
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||
3 |
L |
|
R |
|
|
E |
|
O/B |
4 |
|
AUX |
|
Y |
|
|
SI |
|
G |
|
|
S2 |
|
C |
OPTIONAL 24 VAC |
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COMMON CONNECTION |
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OUTDOOR/INDOOR |
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FAN RELAY |
5 |
TEMPERATURE |
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SENSOR |
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CHANGEOVER |
|
|
|
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||
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COMPRESSOR 2 |
VALVE |
COMPRESSOR 1 |
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|
||
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER.
3MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED AS A 24 VAC OUTPUT. SEE "L TERMINAL" SECTION FOR MORE INFORMATION.
4"O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP.
5OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE
THERMOSTAT CABLE. |
M19904 |
Fig. 14. Typical hookup of multistage heat pump with no auxiliary/backup heat (2H/2C heat pump).
|
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HEAT PUMP |
EQUIPMENT |
|
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|
MONITOR |
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1 |
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R |
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Y2 |
|
C |
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2 |
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5 |
L |
R |
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|
E |
O/B |
6 |
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AUX |
Y |
|
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|
SI |
G |
|
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|
S2 |
C |
OPTIONAL 24 VAC |
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||
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COMMON CONNECTION |
|
3 |
OUTDOOR/INDOOR |
|
FAN RELAY |
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||
4 |
TEMPERATURE |
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SENSOR |
CHANGEOVER |
|||
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||||
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VALVE |
||
HEAT 2 RELAY |
EMERGENCY |
COMPRESSOR |
||
(AUXILIARY HEAT) |
HEAT RELAY |
RELAY |
||
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2FACTORY INSTALLED JUMPER.
3OUTDOOR SENSOR REQUIRED IN SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT.
4OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.
5MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS EQUIPMENT MONITOR, CAN ALSO BE USED AS A 24 VAC OUTPUT. SEE "L TERMINAL" SECTION FOR MORE INFORMATION.
6 "O/B" TERMINAL SET TO CONTROL AS EITHER "O" OR "B" IN THE INSTALLER SETUP. |
M19905 |
Fig. 15. Typical hookup of single-stage heat pump with auxiliary/backup heat (2H/1C heat pump).
69-1706 |
6 |
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