Johnson Controls York YCAL0014E Series, Installation, Operation & Maintenance Instructions Manual

Page: 67 / 216

JOHNSON CONTROLS
67
FORM 150.62-NM6 (103)

4. P u t t h e u n i t i n t o S e r v i c e
Mode (as described under the Control Service
and Troubleshooting section) and cycle each
condenser fan to ensure proper rotation.

5. Prior to this step, turn system 2 off (if applicable
–refer to Option 2 under “Unit Keys” section for
more information on system switches.) 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
occur, 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.”
This unit uses scroll compressors
which can only operate in one di­
rection. Failure to observe this will
lead to compressor failure.

6. YCAL0040 - YCAL0124 units only – Turn system 1
off and system 2 on (refer to Option 2 under “UNIT
KEYS” section for more information on system
switches.)
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
occur, 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.”

7. After verifying compressor rotation, return the Unit
Switch to the off position and ensure that both
Systems are programmed for “ON” (refer to Option
2 under “Unit Keys” section for more information
on system switches).
INITIAL START-UP
After the preceding checks have been completed and
the control panel has been programmed as required in
the pre-startup checklist, the chiller may be placed into
operation.

1. Place the Unit Switch in the control panel to the
ON position.

2. The first compressor will start and a flow of refrig
-
erant will be noted in the sight glass. After several
minutes of operation, the vapor in the sight glass
will clear and there should be a solid column of
liquid when the TxV stabilizes.
1
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
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
* Sys 2 Superheat Setpoint
TAbLE 17 – SETPOINTS ENTRY LIST
* NOT ON ALL MODELS
** VIEWAbLE ONLY