York B3CH 048 and 060 installation instructions Air Flow Limitations, Typical Field Wiring

035-12984-001-A-0204

TABLE 2 - AIR FLOW LIMITATIONS

NOMINAL		UNIT MODEL SIZE, NOMINAL TONS
HEATER	VOLTAGE	4	5
SIZE		MINIMUM SUPPLY AIR CFM
KW
7		1,300	1,600
10		1,300	1,600
15	380/415-3+N-50	1,300	1,600
20		1,300	1,600
30		–	1,600

CONTROL WIRING

1 Typical 24-volt thermostat with subbase -2ET03700424 for manual changeover.

2 Only required on units with supplemental electric heat.

TO REMOTE SENSOR

2ET04701324 IF USED

Note: The thermostat terminals shown above are typical. Check thermostat and unit wiring diagrams for correct wiring connections.

1 Typical Electronic programmable thermostat 2ET04701124 with subbase for either manual or automatic changeover.

2Only required on units with economizer. Remove jumper L2 from terminals

4 and 9 on jumper plug P7. The outdoor air intake dampers will return to their fully closed position when the thermostat switches to the “unoccupied” mode.

3Second stage cooling may be used on units with economizer. Remove jumper J1 from terminals 8 and 10 on jumper plug connector P7.

4Only required on units with supplemental electric heat.

POWER WIRING

NEUTRAL

CONTACTORTERMINAL

BLOCK

FIELD-SUPPLIED

DISCONNECT

GROUND LUG

REFER TO ELECTRICAL DATA TABLES TO SIZE THE DISCONNECT SWITCH, THE WIRING AND THE OVERCURRENT PROTECTION.

FIG. 3 - TYPICAL FIELD WIRING

Unitary Products Group 5