York YCAL0014E Series, Installation Operation & Maintenance

Page: 77 / 212

JOHNSON CONTROLS
77
FORM 150.62-NM8 (1020)
1
Startup
Panel Checks
(Power On – Both Unit Switch Off)

1. Apply 3-phase power and verify its value. Voltage
imbalance should be no more than 2% of the
average voltage.

2. Apply 120VAC and verify its value on the terminal
block in the Power Panel. Make the measurement
between terminals 5 and 2 of CTB2. The voltage
should be 120VAC plus or minus 10%.

3. Program/verify the Cooling Setpoints, Program
Setpoints, and unit Options. Record the values in
Table 17 (see information on Setpoints and Unit
keys in Section 2 of this IOM for programming
instruction).

4. Put the unit into Service Mode (as described
under Section 4 Service and Troubleshooting )
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 Key in Section
2 of this IOM 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 direc -
tion. Failure to observe this will lead
to compressor failure.

6. YCAL0040 through YCAL0134 units only – Turn
system 1 off and system 2 ON (refer to Option 2
under Unit Key in Section 2 of this IOM 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.”
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
* Not on all models
** Viewable only
TABLE 17 - SETPOINTS ENTRY LIST