York HFC-410A manual HEATING OPERATION Thermostat Control

FORM 100.50-EG5 (108)

is called from the thermostat, the Supply Fan will start. Ventilation functions (if equipped) will be permitted to run with an occupied signal. Economizer functions will operate with a “G” call and a call for cooling.

HEATING OPERATION

Thermostat Control

If a 7-wire thermostat (2 Cool/2 Heat) controls the unit, all zone-temperature setpoint-control is maintained at

the thermostat. With this operation, the unit remains idle until it receives a stage call from the thermostat. If “G” is called from the thermostat, the Supply Fan will start. Ventilation functions (if equipped) will be permitted to run with an occupied signal.

TABLE 22 – POWER-SUPPLY-CONDUCTOR SIZE RANGE

			Dual-Point TB
Supply	Single-Point	Single-Point	TB 1	TB 2
Voltage	TB	Disconnect
208V	(2*) 250 kcmil-500 kcmil	(2*) 2 AWG-500 kcmil	6 AWG-400 kcmil	6 AWG-350 kcmil
230V	(2*) 250 kcmil-500 kcmil	(2*) 2 AWG-500 kcmil	6 AWG-400 kcmil	6 AWG-350 kcmil
460V	6 AWG-400 kcmil	6 AWG-350 kcmil	14 AWG-2/0	14 AWG-2/0
575V	6 AWG-400 kcmil	6 AWG-350 kcmil	14 AWG-2/0	14 AWG-2/0

NOTE: 2* = Dual pairs per phase

JOHNSON CONTROLS 31