8
STANDARD CONTROL & SAFETY DEVICES
MICROPROCESSOR CONTROLLER:
This controller monitors analog and digital inputs to achieve precise control &
safety functions of the unit.
COMPRESSOR IN-BUILT PROTECTION DEVICE:
Protect the compressor by monitoring:
A) Motor winding temperature in case of overload.
B) Discharge gas temperature in case of overheating.
C) Phase reversal for direction of rotation.
STARTERS:
The starter is operated by the control circuit and provides power to the compressor motors. These devices
are rated to handle safely both RLA and LRA of motors.
CRANKCASE HEATERS:
Each compressor has immersion type crankcase heater. The compressor crankcase heater is always on when
the compressors are de-energized. This protect the system against refrigerant migration, oil dilution and potential compressor failure.
HIGH PRESSURE SWITCH:
This switch provides an additional safety protection in the case of excessive discharge pressure.
STANDARD ACCESSORIES
UNIT ON-OFF SWITCH:
ON-OFF switch is provided for manually switching the unit control circuit.
INDICATOR LIGHTS:
LED lights indicates power ON to the units, MENU adjustment and FAULT indications due to trip on safety devices.
ELECTRONIC EXPANSION VALVE:
Electronic expansion valve is used to regulate the refrigerant flow to the water
cooler and maintain a constant superheat and load optimization.
FILTER DRIER (REPLACEABLE CORE TYPE):
Refrigerant circuits are kept free of harmful moisture, sludge, acids
and oil contaminating particles by the filter drier.
SIGHT GLASS:
A moisture indicating sight glass installed in the liquid line. An easy-to-read color indicator shows
moisture contents and provides a mean for checking the system refrigerant charge.
LIQUID LINE SOLENOID VALVE:
Closes when the compressor is off to prevent any liquid refrigerant from accumulating
in the water cooler during the off cycle.
UNDER VOLTAGE AND PHASE PROTECTION:
Protects against low incoming voltage as well as single phasing, phase reversal
and phase imbalance by de-energizing the control circuit. It is an automatic reset device, but it can be set up for manual reset.
OPTIONS
(All options are at extra cost. Please check with your nearest dealer/sales office)
HOT GAS BYPASS SYSTEM:
Hot gas bypass is provided on the lead circuit to permit operation of the system down to 50%
of its unloaded capacity. Under low ambient condition, it controls temperature by eliminating the need to cycle the compressor
on and off, ensuring narrow temperature swing and lengthen the life span of the compressor.
WATER FLOW SWITCH:
Paddle type field adjustable flow switch for water cooler circuits. Interlock into unit safety
circuits so that the unit will remain off until water flow is determine.
UNIT MOUNT SPRING ISOLATORS:
This housed spring assemblies have a neoprene friction pad on the bottom to
prevent vibration transmission.
COMPRESSOR CIRCUIT BREAKERS:
Protects against compressor branch circuit fault. When tripped (manually or
automatically), the breaker opens the power supply to the compressor and control circuit through auxiliary contacts.
LIQUID COOLERS:
ASME code stamped liquid cooler.
PRESSURE GAUGES:
Suction & discharge pressures gauges.
NON-FUSED MAIN DISCONNECT SWITCHES:
De-energize power supply during servicing/repair works as well as with door interlock.
CONDENSER COIL GUARD:
Protect the condenser coil from physical damage.
COMPRESSOR/COOLER GUARD:
Protect the compressor from vandalism.
COMPRESSOR ENCLOSURE BOX:
Reduce compressor operating noise and keep the compressor clean.
FLANGED COOLER CONNECTION:
Easy on-site piping connections.
COOLER HEATER WRAPPED:
Prevent freezing up of water on low ambient temperature.
COPPER FINS/TUBES CONDENSER COILS:
For seashore salty corrosive environments.
COATED COPPER/ALUMINUM FINS CONDENSER COILS:
For seashore or acid corrosive environments.
BMS:
BACNET, MODBUS, GSM and remote monitoring.