DISCONNECT SWITCH BRACKET
FOR UNITS WITH BELT-DRIVE BLOWER
A special bracket for mounting a field-supplied disconnect
switch is provided in each unit ordered with an optional
belt-drive supply air blower. The bracket is shipped inside the
blower compartment taped to the top of the blower housing.
Install the bracket on the left hand side of the unit as shown in
Figure 5. Several existing screws at the top of the unit and one
screw approximately midway down from the top will be used
for mounting the bracket. Screws should be loosened only -
NOT REMOVED. Matching holes in the bracket have
elongated keyways allowing easy installation. Re-tighten
screws after bracket is in place to ensure panels will remain
leak tight.
FIG. 4 - TYPICAL FIELD WIRING
CONTROL WIRING
24 VOLT
TRANSFORMER
UNIT TERMINAL
STRIP TB1
THERMOSTAT
1
TERMINALS
1
24 VOLT THERMOSTAT 2TH08701024. IF THE UNIT HAS AN ECONOMIZER,
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD
TO PREVENT SIMULTANEOUS OPERATION OF THE COMPRESSOR AND
THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A
SECOND STAGE OF COOLING, USE THERMOSTAT 2TH04701224.
COOLING ONLY (24 VOLT THERMOSTAT)
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
ADD
JUMPER
1
24 VOLT THERMOSTAT 2TH07701024. IF THE UNIT HAS AN ECONOMIZER,
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD
TO PREVENT SIMULTANEOUS OPERATION OF THE COMPRESSOR AND
THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A
SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024 OR
2TH04701524 (WITH SUBBASE 2TB04700224 OR 2TB04700324).
COOLING / HEATING (24 VOLT THERMOSTAT)
24 VOLT
TRANSFORMER
UNIT TERMINAL
STRIP TB1
THERMOSTAT
1
TERMINALS
ADD
JUMPER
ADD
JUMPER
4
2
3
4
NOT
USED
TO REMOTE SENSOR
2TH04702224 IF USED
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE)
TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER
J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.
2
SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
3
SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE
ELECTRIC HEATER.
4
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.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
24 VOLT
TRANSFORMER
THERMOSTAT
1
TERMINALS
ADD
JUMPER
UNIT TERMINAL
STRIP TB1
1
ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).
IF THIS UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8 AND
10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE
COMPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROL THE
ECONOMIZER ON A SECOND STAGE OF COOLING, USE THERMOSTAT 2ET04700224.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
THREE
PHASE
POWER
SUPPLY
FIELD-SUPPLIED
DISCONNECT
GROUND LUG
CONTACTOR
NEUTRAL
TERMINAL
BLOCK
POWER WIRING
530.26-N1YI
6
Unitary Products Group
