257098-BTG-A-0506
Unitary Products Group
21
TYPICAL POWER WIRING
TYPICAL CONTROL WIRING
FIGURE 2 - TYPICAL FIELD POWER & CONTROL WIRING
REFER TO THE ELECTRICAL DATA
TABLES TO SIZE THE DISCONNECT
SWITCH, OVERCURRENT PROTEC-
TION AND WIRING.
RC
Y
R
Y1
Y2
W1
W
W2
G
C
G
RH
THERMOSTAT
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
ADD
JUMPER
1
COOLING / HEATING (24 VOLT THERMOSTAT)
24 VOLT THERMOSTAT 2ET07701024. TO CONTROL THE ECONOMIZER ON THE SECOND
STAGE COOLING OR TO HAVE AN ELECTRIC HEAT ACCESSORY WITH TWO STAGES OF
HEAT, USE THERMOSTAT 2TH0471024.
1
RC
RH
Y1
Y2
W1
W2
G
LED 1
LED 2
COM
A1
A2
T
T
B
R
Y1
Y2
G
C
X
OCC
W2
W1
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
TO REMOTE SENSOR
2TH040702224 IF USED
NOT
USED
ADD
JUMPER
ADD
JUMPER
4
4
3
2
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE).
SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
2
SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE
ELECTRIC HEATER.
3
COOLING / HEATING (ELECTRONIC THERMOSTAT)
MULTI STAGE
REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR
P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY
OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE
THERMOSTAT SWITCHES TO THE SET-BACK POSITION.
4
RH
RC
Y
W
G
R
Y1
W1
C
G
ADD
JUMPER
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).
TO CONTROL THE ECONOMIZER ON SECOND STAGE COOLING, USE THERMOSTAT
2TH04700224.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
SINGLE STAGE
