17
05.17 207646 Rev.103
EKWXA│EKWXBA
AIR-COOLED WATER CHILLERS
AXIAL FANS
OPERATION
START UP
Start up has to be performed by a qualified service person.
It is necessary to take notes of the air inlet and outlet temperatures to the internal coil, the volts and amps of the compressor and
motor fan, as well as the suction and discharge pressure of each compressor.
It should be remembered that it is necessary to clean the air filters after the first 4 hours of operation.
Observe at least, 3 cooling cycle operations.
Due to the unit equips frequency converters, it is essential that the power is at least 300mA to prevent power cuts caused by the
activation of the circuit breaker.
THERMOSTAT AND CONTROL
MCX-15 CONTROL
The control is composed of a user interface and an electronic board.
Power supply 20/30 Vdc
– 24 Vac.
Panel mounting type.
Screen with display that allows the inputs and outputs to be visualized.
Operating mode: 4 compressors, cooling only and heat pump.
Defrosting by pressure transducers.
Management of water circulating pump and hydraulic module.
Clock programming.
Programmable controller with 3 access levels: User, Maintenance and
Manufacturer.
Main Functions of the Control System
Regulates water temperature.
Service hour counter for compressors and water pumps
(optional).
Intake and outlet water temperature reading displays, as well
as, pressure reading displays in evaporator and condenser
stages.
Compressor start timers.
Pressure overload safety protection.
Electronic compressor protection.
External fan protection.
Water flow protection.
Anti-freeze active protection.
Remote ON/OFF.
Remote COOL/HEAT mode toggle
Condensing and evaporating pressure control by incorporating
2 ventilation stages
Check valve for cycle reversion (only available for Heat Pump
units)
Anti-frost feature. Anti-frost start and stop settings through
pressure readings.
Anti-frost duration time control.
Check the following points:
Electrical connections are well tightened.
Panels are firmly secured with screws.
There are no oil or refrigerant leaks.
The unit is correctly leveled.
There is enough space for service and maintenance.
Drainage is not blocked.
Check that the crankcase heater of each compressor is in operation for 24 hours prior to commissioning.
Air filters are cleaned and correctly mounted.
Grilles, air diffusers, air ducts and flexible connections are in good condition.
Electrical power source is in accordance with what is said in the nameplate.
Fans rotate in the right direction.
Reed the User Manual
BEFORE START-UP
