41
IOM_WPHBA-WPHA_091a1201_207954_180610_EN
COMPACT HORIZONTAL PACKAGED WATER-TO-AIR UNITS
WPHBA / WPHA
MAINTENANCE
It is advisable to do maintenance works every 1.000 operating hours as well as at the beginning of each cooling season.
Coils
: At least once a year clean condenser coils with water and detergent and later dry with air at low pressure.
Never clean coil with wire brush.
Indoor fans
: Check the direction of rotation of the fans, verify their carriers. Check the transmission elements and
the operating status.
Drainage system
: Verify condition and good operation of the drainage tray and drain trap. It is necessary to clean the
condensates trays after the first day of operation. Then, clean it at least once a year. Take into account the meteorological
conditions, e.g. in places where falling leaves or the flight of seeds can plug the drain trap, it will also be necessary to clean
them at mid and late spring and autumn. The dates are approximate and will depend on the blooming, falling leaves, seeds,
etc. of the plants of the zone or the human activity or any other cause.
(Check the access to the condensates trays)
Refrigeration circuit:
Check for oil or refrigerant leakage, noise and various system elements vibrations. Take
temperature and pressure readings and record it on the maintenance form.
Electrical circuit:
Make sure that all electrical cables are properly tightened. Be sure that there are not faulty terminals,
contactors, etc. Take measurements of volts and amperes of each phase of every compressor and fan motor. Verify the
starting current. Check the operation of all relays, presostates and phase sequence relay (of scroll compressor).
Air filters:
Clean air filters after 4 hours of system operation and every 3 months (or more depending on application).
Filters can be cleaned by immersion in warm water with soap, later washed in clean water and dry.
Heat exchanger:
It is necessary, at least once a year, to clean the heat exchanger. The heat exchanger is cleaned by
circulating the cleaning liquid inside and if possible in the opposite direction. An acid mixture at 5% is used (5% oxalic
acid). Introduce the cleaning fluid through the exchanger. After this, the circuit should be cleaned with plenty of water to
remove traces of acid. Refill with new water and start up the unit.
DO NOT FORGET to allow the crankcase heater to work for 24 hours before starting the compressor.
Before performing any service or maintenance operation it is mandatory to turn off the main power switch of
the system to avoid any personal injuries. Locked it so that nobody other than a qualified technician can
switch on electrical power.
Before opening the electrical panel and having access to the inside of the machine it is MANDATORY to
disconnect the power supply hose of the machine which MUST BE FREE OF VOLTAGE for this operation.
Legend
1.
Heat exchanger
2.
Cleaning fluid (Water + Acid)
3.
Circulating pump
4.
Cleaning circuit stockpops
5.
Water circuit stockpops
WARNING!
