York BQ 048 Installation Manual download pdf (Page 9)

364985-YIM-A-0308

Johnson Controls Unitary Products 9

FIGURE 3 - TYPICAL FIELD POWER & CONTROL WIRING

REFER TO THE ELECTRICAL DATA

TABLES TO SIZE THE DISCONNECT

SWITCH, OVERCURRENT PROTEC-

TION AND WIRING.

LED 1

LED 2

COM

OCC

THERMOSTAT

TERMINALS

UNIT TERMINAL

STRIP TB1

24 VOLT

TRANSFORMER

TO REMOTE SENSOR

2TH040702224 IF USED

NOT

USED

ADD

JUMPER

ADD

JUMPER

ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE).

SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.

SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH A TWO STAGE

ELECTRIC HEATER OR 2 STAGE GAS HEAT.

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)

MULTI STAGE

ADD

JUMPER

THERMOSTAT

TERMINALS

UNIT TERMINAL

STRIP TB1

24 VOLT

TRANSFORMER

ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).

TO CONTROL THE ECONOMIZER ON SECOND STAGE COOLING, USE THERMOSTAT

2TH04700224.

COOLING / HEATING (ELECTRONIC THERMOSTAT)

SINGLE STAGE

THERMOSTAT

TERMINALS

UNIT TERMINAL

STRIP TB1

24 VOLT

TRANSFORMER

ADD

JUMPER

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.

COOLING / HEATING (24 VOLT THERMOSTAT)

TYPICAL POWER WIRING

TYPICAL CONTROL WIRING

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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York BQ 048 Installation Manual Page 9

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