Preparation - Power On - York YCUL0020 Installation, Operation And Maintenance Manual

SECTION 6 – COMMISSIONING
Grounding
Verify that the unit's protective ground terminal(s) are
correctly connected to a suitable grounding point. En-
sure that all unit internal ground connections are tight.
Supply voltage
Verify that the site voltage supply corresponds to the
unit requirement and is within the limits given in the
Technical Data Section.
Preparation – power on
Perform the commissioning using the
detailed checks outlined in the "Equip-
ment Pre-Startup and Startup Check
List" as the commissioning procedure is
carried out.
Apply power to the unit. Turn ON the option panel cir-
cuit breaker if supplied.
The machine is now live.
104
Switch settings
Ensure that 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. Ensure
the system switches under the SYSTEM SWITCHES
key are in the OFF position.
Compressor heaters
Verify the compressor heaters are energized. If the am-
bient temperature is above 96°F (36°C) the compressor
heaters must be on for at least 8 hours before start-up
to ensure all refrigerant liquid is driven out of the com-
pressor 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 and 14 of CTB1 on the panel. (See Figure 11 on
page 39).
Form 150.63-NM9
Issue date: 5/20/2021
JOHNSON CONTROLS