Table 10 - Setpoints Entry List; Checking Superheat And Subcooling - York YCAL0019 Installation, Operation And Maintenance Manual

SECTION 6 – COMMISSIONING

TABLE 10 - 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
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. Temperature Cutout
Leaving Liquid Temperature
Cutout
Anti-Recycle Time
Fan Control ON Pressure
Fan Differential OFF Pres-
sure
Total # of Compressors
* Number of Fans/System
* Unit/Sys Voltage
Unit ID
* Not on All Models
** Viewable Only
 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 oc-
150
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 6. YCAL0043 – YCAL0066 units only – Turn sys-
N/A
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CHECKING SUPERHEAT AND SUBCOOLING

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The subcooling temperature of each system can be cal-
culated by recording the temperature of the liquid line
at the outlet of the condenser and subtracting it from
the liquid line saturation temperature at the liquid stop
valve (liquid line saturation temperature is converted
from a temperature/pressure chart).
Example:
325 PSIG converted to temp. 101 °F
The subcooling should be adjusted to 15 °F at design
conditions.
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.
tem 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 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.
Liquid line pressure =
minus liquid line temp. - 86 °F
Subcooling =
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
15 °F
JOHNSON CONTROLS