T874H,Q,W Multistage Thermostats and
Q674B,C,G,L Subbases
APPLICATION
The T874H,Q,W Multistage Thermostats provide 24 to 30 Vac control for heating and cooling systems as listed in Table 1.
Table 1. Heating and Cooling Stages.
|
|
|
|
|
|
|
|
T874 Model |
|
||
|
|
|
|
|
|
Stage |
Ha |
|
Q |
|
W |
Heating Stages |
1 |
|
1 |
|
3 |
|
|
|
|
|
|
Cooling Stages |
1 |
|
— |
|
2 |
|
|
|
|
|
|
a Plus a changeover stage that operates with cooling.
The Q674B,C,G,L Subbases provide wiring terminals, system and fan switching, and mounting bases for T874 Multistage Thermostats as listed in Table 2.
Table 2. Switching Positions.
Q674 |
Switch Positions |
|
Model |
System |
Fan |
|
|
|
B |
Heat-Off-Cool |
Auto-On |
|
|
|
C |
Off-Auto |
Auto-On |
|
|
|
G |
Off-Auto |
None |
|
|
|
L |
Em Ht-Heat-Off-Cool |
Auto-On |
|
|
|
INSTALLATION INSTRUCTIONS
When an LED lights, refer to this list for the meaning: FILTER: clogged filter needs replacement.
EM. HT.: emergency heat is operating. The compressor has failed, and the heat pump is not operating. The LED lights when the homeowner places the system switch in the EM. HT. position.
AUX. HT.: auxiliary heat is operating because the weather is so cold that the heat pump alone cannot handle the load.
SERVICE or CHECK: system needs to be checked. See heating system instructions for specific meaning.
LEDs are not field addable or replaceable.
RECYCLING NOTICE
This control contains mercury in a sealed tube. Do not place the control in the trash at the end of its useful life.
If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash.
Contact your local waste management authority for instructions regarding the recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube.
OPERATION
On a two-stage or three-stage heat thermostat, the stages of heat make sequentially as the temperature drops. Make refers to the mercury switch initiating a call for heat or cool.
There are about 2°F (1°C) between the stages so that the second stage makes only when the first stage can not handle the load. About one degree later, the third stage makes (T874W only). This degree difference is called the interstage differential.
Select models include LEDs (light-emitting diodes). The LED lights to indicate a problem with the system; refer to the system manufacturer instructions.
INSTALLATION
When Installing this Product…
Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
Installer must be a trained, experienced service technician.
After installation is complete, check out product operation as provided in these instructions.
Copyright © 1996 Honeywell Inc. • |
• All Rights Reserved |
X-XX UL |
69-0087-6 |
T874H,Q,W MULTISTAGE THERMOSTATS AND Q674B,C,G,L SUBBASES
CAUTION
1.Disconnect the power supply to prevent electrical shock or equipment damage.
2.Run the wires as close as possible to the subbase. To prevent interference with the thermostat linkage, keep the wire length to a minimum. Push the excess wire back into the hole, and plug the hole to prevent drafts from affecting the thermostat operation.
3.Do not tighten the thermostat captive mounting screws to the point of damaging the subbase threads.
4.Do not short across the coil terminals on the relay. This can burn out the heat anticipator.
5.Never install more than one wire per terminal unless a factory-supplied jumper with a spade terminal is used.
IMPORTANT
These thermostats are calibrated at the factory by using subbases mounted at true level. Inaccurate subbase leveling causes thermostat control deviation.
Location
Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature.
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 behind the thermostat such as an outside wall.
Mounting and Wiring the Subbase
Mount the subbase on a wall or horizontal outlet box. If you mount it on a vertical outlet box, order Honeywell part no. 193121A Adapter Assembly, which includes an adapter ring with two screws, and a cover plate to cover the marks on the wall.
All wiring must comply with local electrical codes and ordinances. Follow the equipment manufacturer wiring instructions, when available.
To install the subbase:
Prepare a hole for the thermostat wires at the chosen location. Run wires to the location.
Pull about 6 in. (152 mm) of wire through the hole.
IMPORTANT
Use 18 gauge, color-coded thermostat cable for proper wiring.
When mounting the subbase on a vertical outlet box, install an adapter ring with the two screws provided with the adapter assembly. See Fig. 1.
Pull the wires through the cover plate (if used) and the subbase wire opening. Secure the cover plate and subbase with the two screws provided, but do not fully tighten.
The subbase mounting slots provide for minor out- of-level adjustments. Level the subbase by using a spirit level and tightening the subbase mounting screws. See Fig. 2.
VERTICAL MOUNTING
OUTLET SCREWS (2)
BOX 1
COVER
ADAPTER PLATE 2
RING 2
1 HORIZONTAL OUTLET BOX
|
|
|
|
THERMOSTAT |
|
|
COO |
L |
THERMOSTAT |
|
|
80 |
|
COVER |
|
|
60 70 |
|
|
|
|
50 |
|
|
SUBBASE |
|
70 |
|
|
|
|
80 |
|
|
|
|
60 |
|
|
|
HEA |
T 50 |
|
|
|
|
|
|
|
SUBBASE |
|
|
|
|
MOUNTING SCREWS (2) |
|
|
|
|
|
|
|
|
80 |
|
70 |
CAPTIVE |
60 |
50 |
|
MOUNTING SCREWS (2) |
|
1 NOT INCLUDED WITH UNIT.
2 ACCESSORY PARTS AVAILABLE (193121A). |
M6009 |
Fig. 1. Installation on vertical or horizontal outlet box.
|
|
TOP |
WIRING |
THERMOSTAT |
|
|
|
MOUNTING |
TERMINAL |
CABLE OPENING |
|
SPIRIT LEVEL |
HOLES (2) |
|
|
|
|
|
|
|
|
|
|
MOUNTING |
POST (2) FOR |
TO SPRING FINGER |
|
HOLES (2) |
MOUNTING |
CONTACTS ON THE |
|
|
THERMOSTAT |
THERMOSTAT |
|
|
|
(UP TO 12) |
M927 |
|
|
|
Fig. 2. Leveling subbase.
Connect the system wires to the subbase. See Fig. 4 through 9. A letter code for identification is located near each terminal. The terminal barrier permits straight or conventional wraparound wiring connections. See Fig. 3. Either method is acceptable. Run the wires as close as possible to the subbase, keeping the wire length to a minimum. Push the excess wire back into the hole. Plug the hole to prevent drafts.
IMPORTANT
An incorrectly leveled subbase causes the temperature control to deviate from the setpoint.
69-0087—6 |
2 |
T874H,Q,W MULTISTAGE THERMOSTATS AND Q674B,C,G,L SUBBASES
Mounting C815A Thermistor (T874W only)
The T874W is used with the C815A Thermistor mounted in the outdoor section. Locate it in an area where it can measure the true outdoor ambient temperature. Avoid mounting the C815A in an area where it is exposed to high temperatures or direct sunlight. Refer to heat pump equipment instructions for proper mounting.
FOR STRAIGHT |
FOR WRAPAROUND– |
INSERTION– |
|
STRIP 5/16 in. (8 mm) |
STRIP 7/16 in. (11 mm) |
BARRIER |
|
SUBBASE TERMINAL SCREW |
M928 |
Fig. 3. Wiring connections.
THERMOSTAT |
SUBBASE |
SYSTEM COMPONENTS |
2 |
|
Y1 |
|
|
H1 |
|
|
|
|
|
|
FALL |
ANTICIPATOR |
|
|
|
COOL CHANGEOVER |
|
|
3 |
|
|
|
VALVE |
||
|
H1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
FAN SWITCH |
|
|
|
|
|
|
4 |
AUTO |
|
|
|
FAN RELAY |
|
|
|
|
|
|
|
|
|
|
|
|
|
G |
|
|
|
|
|
ON |
|
R |
|
|
|
|
|
|
|
|
|
|
|
|
|
SYSTEM |
|
Y2 |
|
|
|
|
8 |
|
|
|
|
|
|
|
SWITCH |
|
|
|
COMPRESSOR |
|
|
|
|
|
|
|
||
|
|
|
OFF |
|
|
|
|
|
|
|
|
B |
|
CONTACTOR |
|
|
RISE |
9 |
AUTO |
|
|
|
|
|
|
|
|
|
|
||
|
|
C1 |
|
|
|
|
|
|
|
ANTICIPATOR |
|
|
|
|
|
|
CO |
|
|
|
|
|
1 |
|
|
10 |
|
|
O |
L1 |
L2 |
|
|
|
|
|
|
(HOT) |
|
|
RISE |
|
2 |
X |
|
|
|
|
|
|
|
|
|||
|
C1 |
|
|
SERVICE LED |
|
COMPRESSOR |
|
|
|
|
|
|
|
||
|
|
|
|
(YELLOW) |
|
|
|
1 |
POWER SUPPLY. PROVIDE DISCONNECT MEANS |
|
FAULT |
|
|||
|
|
|
|||||
|
AND OVERLOAD PROTECTION AS REQUIRED. |
|
C |
|
|
||
|
|
|
|
|
|
|
2 SERVICE LED ON SELECT MODELS. |
M3680A |
Fig. 4. T874H/Q674C in heating-cooling system.
|
THERMOSTAT |
SUBBASE |
SYSTEM COMPONENTS |
|
|
2 |
|
Y1 |
|
|
H1 ANTICIPATOR |
FAN SWITCH |
COOL CHANGEOVER |
|
H1 |
|
|||
3 |
VALVE |
|||
|
|
|||
FALL |
AUTO |
G |
||
|
||||
|
4 |
ON |
FAN RELAY |
|
|
|
|
R |
|
|
|
|
COMPRESSOR |
|
|
|
|
CONTACTOR |
|
|
RISE |
|
Y2 |
|
|
|
|
||
|
|
|
B |
|
CO |
8 |
|
|
|
|
|
|
||
|
|
|
O |
|
|
9 |
SYSTEM |
X |
|
|
|
SWITCH |
||
|
|
|
||
|
C1 ANTICIPATOR |
|
SERVICE |
|
|
OFF |
LED (YELLOW) |
||
|
10 |
|||
|
|
X1 |
||
|
|
AUTO |
||
C1 |
RISE |
|
|
|
|
|
C |
||
|
|
|
||
|
|
|
24 VAC |
|
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS |
FILTER LED (RED) |
|||
AND OVERLOAD PROTECTION AS REQUIRED. |
X2 |
Fig. 5. T874H/Q674C in heating-cooling system with SERVICE LED and FILTER LED.
1
L2
L1 (HOT)
M5902
3 |
69-0087—6 |