Johnson Controls York YCRL0064, Installation Operation & Maintenance

Page: 96 / 162

JOHNSON CONTROLS
96
FORM 150.27-NM1
ISSUE DATE: 09/30/2015
SECTION 6 – COMMISSIONING
4. Put the unit into Service Mode ( as described
under the SECTION 9 – SERVICE AND TROU-
BLESHOOTING) and cycle each condenser fan
to ensure proper rotation.
5. Prior to this step, turn system 2 OFF and sys-
tem 1 ON ( refer to Option 2 under Unit Keys
on Page 123 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 oc-
cur, the compressor being tested is operating in
the reverse direction and must be corrected. Af-
ter 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 direction. Failure
to observe this will lead to compressor
failure.
6. Turn system 1 OFF and system 2 ON (refer to
Option 2 under
Unit Keys on Page 123
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 oc-
cur, the compressor being tested is operating in
the reverse direction and must be corrected. Af-
ter verifying proper compressor rotation, turn
the Unit Switch to OFF.
Excessive flow may cause catastrophic
damage to the heat exchanger (evapora-
tor).
TABLE 13 - 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
N/A
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
N/A
Fan Differential Off
Pressure N/A
Total # of Compressors
* Number of Fans/System N/A
* Unit/Sys Voltage
Unit ID
* Not on All Models
** Viewable Only