First Co EVBQ (Variable Speed) - Manual (Page 14)

Heating mode – If the indoor temperature is below the thermostat set point, the thermostat sends a signal to the fan coil
to deliver heat pump and hot water heating airflow.
Emergency Heat – If the thermostat is set to emergency heat, the thermostat sends a signal to deliver hot water heat
only. No mechanical heat is produced from the heat pump.
NOTE: Some thermostats may require a jumper between Emergency heat and W1 for proper operation.
Refer to the thermostat installation instructions for more information.
1 4 5 3 2
AC
LINE
AC
LINE
CHASSIS
GROUND JUMPER PIN 1 TO PIN 2 FOR
120VAC LINE INPUT ONLY
Figure 11 - 5 Pin Power Connector
Table 2 - Wiring Harness Terminations
* Check voltages wit 16-Pin Plug disconnected from the motor.
** These signals will start the motor.
Dehumidify - 24VAC is present with a call for no dehumidication.
Figure 10 - 16 Pin Signal Connector
WARNING: Applying 240VAC line input
with Pin 1 and Pin 2 jumper in place
will permanently damage unit.
14
Pin # on
16-Pin
Connector
Signal on pin with
Screw Terminal
Jumpered to R *
1 Common
2 W /W1 Heating Signal 24VAC **
3 Common
4 Delay Adjust
5 Cool Fan Adjust
6 Y1 AC / Heat Pump (-) 12VDC **
7 CFM Adjust
8 Not Used
9 "O" (HP/Cool) Reversing Valve
10 Dehumidify 0V (24VAC on no call)
11 Heat Fan Adjust
12 24V AC 24VAC continuous
13 W2 / EM Heating Signal 24VAC **
14 Y /Y2 AC / Heat Pump (-) 12VDC **
15 G Fan Signal 24VAC **
16 Not Used
Description
16-Pin Motor Wiring Harness to 16-Pin Connector on Select Board
1 2 3 4 6 5 7 8
9 10 11 12 14 13 15 16
G 24v DH
C W1 C
Y2