Johnson Controls YORK YK MaxE User Manual

FORM 160.54-O1
159
JOHNSON CONTROLS
2
“CONDENSER – HIGH PRESSURE
CONTACTS OPEN”
The contacts of the electro-mechanical high pressure
safety device, located on the condenser shell, have
opened because this device has detected a pressure >
180.0 PSIG (R134a – except “P” compressors), >200.0
PSIG (R134a – “P” compressors), >265.0 (R22). The
contacts will automatically close when the condenser
pressure decreases to <120.0 PSIG (R134a – except “P”
compressors), <140.0 PSIG (R134a – “P” compressors),
< 205 PSIG (R22). The chiller can be started after the
contacts close and the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
For special order R134a high condenser temperature
chiller applications, a special HP cutout is set to trip/
reset at 200/140 PSIG.
“CONDENSER – HIGH PRESSURE”
The condenser pressure, as sensed by the Condenser
Transducer, has increased to >180.0 PSIG (R134a),
>265.0 PSIG (R22). The chiller can be started after the
pressure decreases to < 120.0 PSIG (R134a), < 205 PSIG
(R22) and the COMPRESSOR switch is placed in the
Stop-reset (O) position.
For special order R134a high condenser temperature
chiller applications, the CONDENSER TEMPERATURE
RANGE setpoint (software version C.OPT.01.19.307 or
later) is set to "Extended". The trip/reset threshold is
then 200/140 PSIG.
“ CONDENSER – HIGH PRESSURE –
STOPPED”
(Software versions C.MLM.01.11.xxx and later or
C.OPT.01.11.303 and later) The condenser pressure
exceeded 160.0PSIG (R134a), 240.0 PSIG (R22) while
the chiller was stopped. High temperature condenser
water owing through the condenser while the chiller
is shutdown can cause a condenser high pressure con-
dition resulting in loss of refrigerant. This safety fault
anticipates this problem by annunciating the condenser
high pressure condition. The chiller can be restarted
after a Service Technician performs a special reset
preset procedure contained in YORK Service Manual
160.54-M1.
For special order R134a high condenser tempera-
ture chiller applications, the CONDENSER TEM-
PERATURE RANGE setpoint (software version
C.OPT.01.19.307 or later) is set to "Extended". The trip/
reset is then 170/170 PSIG .
“CONDENSER – PRESSURE TRANSDUCER OUT
OF RANGE”
The Condenser Pressure Transducer is indicating a pres-
sure that is < 6.8 PSIG (R134a), < 24.2 PSIG (R22) or >
300.0 PSIG (R134a or R22). This is outside the normal
operating range of the transducer. This is generally in-
dicates a defective transducer. The chiller can be started
after the transducer is indicating a pressure that is within
range and the COMPRESSOR switch is placed in the
Stop-Reset (O) position.
“AUXILIARY SAFETY – CONTACTS CLOSED”
The Auxiliary Safety shutdown contacts, connected
to I/O Board TB4-31 have closed, initiating a safety
shutdown. This input is a general-purpose, user dened
safety shutdown input. The chiller can be started after the
contacts open and the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
“DISCHARGE – HIGH TEMPERATURE”
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has increased to greater than
220.0°F. The chiller can be started after the temperature
decreases to less than 220.0°F and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
“DISCHARGE – LOW TEMPERATURE”
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has decreased to less than
30.0°F. The chiller can be started after the temperature
increases to greater than 30.0°F and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
“OIL – HIGH TEMPERATURE”
The oil temperature, as sensed by the Oil Temperature
Thermistor, has increased to greater than 180.0°F. The
chiller can be started after the temperature decreases to
less than 180.0°F and the Compressor switch is placed
in the Stop-Reset (O) position.
“OIL – LOW DIFFERENTIAL PRESSURE”
The differential oil pressure decreased to less than 15.0
PSID while the chiller was running or failed to achieve
25.0 PSID by the last 5 seconds of the “System Prelube”
period. The differential oil pressure is the difference
between the output of the Sump Oil Pressure Transducer
(system low pressure) and the output of the Pump Oil
Pressure Transducer (system high pressure). The chiller
can be started after the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
“OIL - HIGH DIFFERENTIAL PRESSURE”
The differential oil Pressure increased to greater than 90.0
PSID (120.0 PSID with software versions C.MLM.01.08.
xxx (and later) or C.OPT.01.08A.xxx (and later)) while
the oil pump was running. The differential oil pressure is

Johnson Controls YORK YK MaxE Specifications

General

Brand	Johnson Controls
Model	YORK YK MaxE
Category	Chiller
Language	English