YORK INTERNATIONAL
61
FORM 150.62-NM7 (103)
! 4. Put the unit into Ser vice Mode (as described un der
the Con trol Ser vice and Trou ble shoot ing sec tion)
and cy cle each condenser fan to en sure prop er
ro ta tion.
! 5. Prior to this step, turn system 2 off (if applicable
–refer to Option 2 under “Unit Keys” section for
more in for ma tion on system switches.) Con nect a
man i fold gauge to system 1 suc tion and dis charge
ser vice valves.
Place the Unit Switch in the control panel to the
ON po si tion. As each compressor cy cles on,
en sure that the dis charge pressure ris es and
the suction pres sure de creas es. If this does not
occur, the com pres sor being test ed is op er at ing
in the re verse di rec tion and must be cor rect ed.
Af ter verifying prop er com pres sor ro ta tion, turn
the Unit Switch to “OFF.”
This unit uses scroll compressors
which can only op er ate in one di-
rec tion. Fail ure to ob serve this will
lead to com pres sor fail ure.
! 6. YCAL0117 - YCAL0377 units only – Turn sys tem
1 off and system 2 on (refer to Option 2 un der
“UNIT KEYS” section for more in for ma tion on
sys tem switch es.)
Place the Unit Switch in the control panel to the
ON po si tion. As each compressor cy cles “on,”
en sure that the discharge pres sure ris es and
the suc tion pressure de creas es. If this does not
occur, the com pres sor being test ed is op er at ing
in the re verse direction and must be cor rect ed.
Af ter verifying prop er com pres sor ro ta tion, turn
the Unit Switch to “OFF.”
The chilled liquid setpoint may need
to be tem po rari ly lowered to ensure all
com pres sors cy cle “on.”
! 7. After verifying com pres sor ro ta tion, return the Unit
Switch to the off position and ensure that both
Sys tems are pro grammed for “ON” (refer to Op tion
2 un der “Unit Keys” sec tion for more in for ma tion
on sys tem switches).
INITIAL START-UP
After the preceding checks have been com plet ed and
the control pan el has been programmed as required in
the pre-startup checklist, the chill er may be placed into
op er a tion.
! 1. Place the Unit Switch in the control panel to the
ON position.
! 2. The fi rst compressor will start and a fl ow of re frig -
er ant will be noted in the sight glass. After sev er al
min utes of op er a tion, the vapor in the sight glass
will clear and there should be a sol id col umn of
liquid when the TXV stabilizes.
1
OP TIONS
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
TA BLE 16 – SETPOINTS ENTRY LIST
* NOT ON ALL MODELS
** VIEWABLE ONLY
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