York YLUA0248 Series, Installation Operation & Maintenance

Page: 43 / 158

JOHNSON CONTROLS
43
SECTION 4 – INSTALLATION
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
4
CONTROL WIRING
FIGURE 10 - CONTROL WIRING
LD13344A
It is possible that multiple sources of
power can be supplying the unit power
panel. To prevent serious injury or
death, the technician should verify that
NO LETHAL VOLTAGES are present
inside the panel AFTER disconnecting
power, PRIOR to working on equipment.
The unit evaporator heater uses
120VAC. Disconnecting 120VAC power
from the unit, at or below freezing tem-
peratures, can result in damage to the
evaporator and unit as a result of the
chilled liquid freezing.
XTBC1
51
13
13
50
21
13
20
13
PWM INPUT (CAN ONLY BE USED WITH DISCHARGE AIR
TEMP CONTROL)
SYSTEM 2 THERMOSTAT (SUCTION PRESSURE CONTROL ONLY)
(JUMPER FOR DISCHARGE AIR TEMP CONTROL)
SYSTEM 1 THERMOSTAT (SUCTION PRESSURE CONTROL ONLY)
(JUMPER FOR DISCHARGE AIR TEMP CONTROL)
AIR PROVING SWITCH (DISCHARGE AIR TEMP CONTROL AND
SUCTION PRESSURE CONTROL) AND REMOTE START/STOP
LOAD LIMIT INPUT
*
* Factory wired with optional transformer.
XTBC2
BLOWER
LD07730C
(MUST BE CLOSED TO OPERATE)