York YLUA0248 Series, Installation Operation & Maintenance

Page: 90 / 158

JOHNSON CONTROLS
90
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
SECTION 6 – COMMISSIONING
PREPARATION – POWER ON
Perform the commissioning using the de-
tailed checks outlined in the EQUIPMENT
PRE-STARTUP & STARTUP CHECK
LIST as the commissioning procedure is
carried out.
Apply power to the unit. Turn ON the option panel
circuit breaker if supplied.
The machine is now live!
Switch Settings
Assure the condensing unit OFF/ON UNIT switch at
the bottom of the keypad is OFF. Place the optional
circuit breaker handle on the panel door to ON. The
customer’s disconnection devices can now be set to
ON.
Verify the control panel display is illuminated. Assure
the system switches under the SYSTEM SWITCHES
Key are in the OFF position.
Compressor Heaters
Verify the compressor heaters are energized. If the
ambient temperature is above 96 °F (36 °C) the com-
pressor heaters must be on for at least 8 hours before
start-up to ensure all refrigerant liquid is driven out of
the compressor and the oil. If the ambient temperature
is below 86 °F (30 °C), allow 24 hours.
Air Flow Switch
Verify an air flow switch is correctly fitted in the cus-
tomer’s ductwork and wired into the control panel cor-
rectly using shielded cable.
The air flow switch should be connected to terminals
13, 50 and 51 of XTBC1 on the panel. (See
Figure 10
on page 43 ).