Table of Contents
Advertisement
3.- COMMISSIONING AND OPERATION
3.2.- STEPS TO FOLLOW FOR COMMISSIONING THE UNITS
- On the heat pump units, the compressor has a single phase electric heating element to assure a separation
between the Refrigerant and the oil in the housing. This heater is activated when the compressor is off and stops
working when the compressor is on.
About eight hours before start up or after a long shutdown period, voltage should be supplied to the unit so that
this heater will be activated.
- To start the unit, follow the instructions given in the Control Panel Manual supplied with the unit
(requesting operation in any of the modes, cooling, heating, or automatic).
After a time lapse, the unit will start.
- With unit operating, check that the fans are turning freely and in the proper direction.
REMEMBER THAT THE COMPRESSOR IS A SCROLL TYPE COMPRESSOR:
Scroll type compressors only compress in one direction of the rotation. Single phase models are always
started up in the proper direction; however, the three phase models, turn in either direction depending on
the order of the power supply phases. Therefore, it is essential that the phase connection for scroll-type
three-phase compressors be carried out correctly (the correct direction of rotation can be checked when
the pressure on the suction side decreases and the pressure on the discharge side increases when the
compressor is activated). If the connection is wrong, the rotation will be reversed causing a high noise
level and a reduction in the amount of current consumed. If this occurs, the compressor's internal protection
system will kick in shutting down the unit. The solution is to disconnect, switch the wires between two of
the phases and connect again).
- Check compressor oil level, sight glass included (on the sides of the compressor, the level should be between
1/4 and ·3/4 in the sight glass, while during operation the level should be between 3/4 and full).
- Connect high and low pressure gauges and check that operating pressure values are normal.
- Measure electrical consumption for the unit and check that it is near what is indicated on the Rating Plate.
- Check the electrical consumption of the compressor and the fans with what is specified in the physical data sheets.
- In the case of a Heat Pump unit, make a cycle change on the Control Panel checking that the 4-way valves make
the change correctly. Check the pressure values in the new cycle.
- Remember the low pressure switch is reset automatically and the high pressure switch is reset electronically.
- Check that pressure switches stop the unit:
FOR THE COOLING CYCLE UNIT:
Stop the outdoor fan by disconnecting it. The high pressure should rise and the pressure switch should stop the
compressor at 27.5 kg/cm . Reconnect the fan and electrically reset the pressure switch by pressing the "RESUME"
button on the Control Panel for 5 seconds and wait for the anti-cycle time (5 minutes), afterwards, the unit will
start-up again.
Stop the indoor fan by disconnecting it. The low pressure should drop and the unit should stop when the pressure
2
gauge reaches 1 kg/cm . The unit will start up again when the pressure rises and the pressure gauge indicates
2
2 kg/cm . Once this has been carried out, stop the unit and reconnect the fan.
- Start the unit again and when everything is operating normally, take a reading of all the data and fill out the
Commissioning Sheet.
2
25
Advertisement
Table of Contents
