Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 11

HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE
Changing Fan Operation in Emergency Heat Mode for Electronic Thermostats
In the emergency heat mode (system switch in EM. HT. position), the thermostat controls the fan operation with a call for
first stage heat. This means that when the thermostat calls for heat, the thermostat also calls for fan operation. However,
this fan operation is not desirable on some types of systems.
To change the fan operation on the TRADELINE and SUPER TRADELINE models, follow the wiring diagram shown
below. Connecting the thermostat and relay to the equipment in this manner disables the fan switch in the emergency
heat mode. During normal operation, the fan switch is enabled and the fan operation is as described in the installation
instructions.
Fig. 4 Changing fan operation in emergency heat mode for electronic thermostats.
Heat Pump Manufacturer Relay Wiring Connections
The wiring connections for some thermostats to specific types of heat pump equipment require a separate relay for
proper operation. Refer to Fig. 5 through 13 for the wiring connections of these types of equipment.
Fig. 5. Relay wiring connections for Carrier equipment (typical 38BQ), and T8511M, T8611M,
PC8900/W8900B1002. Require relay (R8222B1067 typically) for proper operation.
E
G
Thermostat
Existing Control
Equipment Function Terminal Designation
Transformer Common
1st Stage Cooling
1st Stage Heating
R (Power)
C (Common)
E (EM. Heat)
G (Fan)
R8222B Relay Equipment
C
Y1
W1
M13232
New Terminal
Designation
C
Y
O
M13235
70-6627 • 9