York YCAL0012EC, Installation Operation & Maintenance

Page: 42 / 166

JOHNSON CONTROLS
42
FORM 150.66-NM2
ISSUE DATE: 09/25/2020
SECTION 5 - COMMISSIONING

4. Put the unit into Service Mode (as described under
the Control Service and Troubleshooting section)
and cycle each condenser fan to ensure proper
rotation.

5. Connect a manifold gauge to system 1 suction and
discharge service valves.
Place the Unit Switch in the control panel to the
“ON” position. As each compressor cycles on,
ensure that the discharge pressure rises and the
suction pressure decreases. If this does not oc-
cur, the compressor being tested is operating in
the reverse direction and must be corrected. After
verifying proper compressor rotation, turn the
Unit Switch to “OFF.”
The chilled liquid setpoint may need
to be temporarily lowered to ensure
all compressors cycle “on.”
This unit uses scroll compressors
which can only operate in one direc­
tion. Failure to observe this will lead
to compressor failure.
The chilled liquid setpoint may need
to be temporarily lowered to ensure all
compressors cycle “ON”.
OPTIONS
Display language
Sys 1 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
leaving liquid 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
TABLE 1 – SETPOINTS ENTRY LIST
* NOT ON All MODElS
** VIEWABlE ONly