York YCUL0020, Installation, Operation And Maintenance Manual

Page: 106 / 178

JOHNSON CONTROLS
106
Form 150.63-NM9
Issue date: 5/20/2021
SECTION 6 – COMMISSIONING
JOHNSON CONTROLS
2
FORM 150.63-CL2
ISSUE DATE: 03/12/2019
TABLE 1 - SETPOINTS ENTRY LIST
OPTIONS
Display Language
Sys 1 Switch
Sys 2 Switch
Chilled Liquid
* Ambient Control
Local/Remote Mode
Control Mode
Display Units
* Lead/Lag Control
* Fan Control
Manual Override
Current Feedback
** Soft Start
** Unit Type
** Refrigerant Type
** Expansion Valve Type
COOLING SETPOINTS
Cooling Setpoint
Range
EMS-PWM Max. Setpoint
PROGRAM
Discharge Pressure Cutout
Suct. Pressure Cutout
Low Amb. Temp. Cutout
Anti-Recycle Time
Fan Control On Pressure
Fan Differential Off Pressure
Total # of Compressors
* Number of Fans/System
* Unit/Sys Voltage
Unit ID
* Sys 1 Superheat Setpoint
* Sys 2 Superheat Setpoint
* Not on All Models
** Viewable Only
Place the Unit Switch in the control panel to the
“ON” position. As each compressor cycles ON, en-
sure that the discharge pressure rises and the suc-
tion pressure decreases. If this does not occur, the
compressor being tested is operating in the reverse
direction and must be corrected. After verifying prop-
er compressor rotation, turn the Unit Switch to “OFF.”
The discharge air or suction pressure
setpoint may need to be temporarily
lowered to ensure all compressors cycle
“ON.”
This unit uses scroll compressors which
can only operate in one direction. Failure
to observe this will lead to compressor
failure.
6. Turn system 1 “off” and system 2 “on” (refer to Op-
tion 2 under “UNIT keys” in Section 7 for more in-
formation on system switches). ...............................
Place the Unit Switch in the control panel to the
“ON” position. As each compressor cycles “on”, en-
sure that the discharge pressure rises and the suc-
tion pressure decreases. If this does not occur, the
compressor being tested is operating in the reverse
direction and must be corrected. After verifying prop-
er compressor rotation, turn the Unit Switch to “OFF”.
The chilled liquid setpoint may need to
be temporarily lowered to ensure all com-
pressors cycle “ON”.