Troubleshooting guide

19
VMIFB202
The compressor’s IPR valve opens
Action:
When the valve opens, this is indicated by the pressure on the low pressure side rising and reaching the pressure of the high pressure
side. Check at what pressure the valve starts to open.
The compressor has an integrated IPR valve that opens at 28 ±3 bar. When the valve opens, pressure equalize between the
compressor’s high and low pressure sides and a milling, whistling sound is heard.
To establish whether the valve opens at the correct pressure, connect a manometer on the high and low pressure sides.
If it opens at too low a pressure, replacing the compressor may be the solution.
Compressor fault
Action:
If the compressor is loud and you have ruled out other reasons for loud compressor
noise the compressor itself may be defective and needs to be replaced
Noise from the soft-starter
Action:
Measurement check the input and output phases for the soft-starter as well as the control signals from the control computer.
Circulation noise
Action:
Check the heating system for closed valves or other restrictions that could cause circulation noise.
Check if the heating system is correctly adjusted for ow, make adjustments if necessary.
High ow in the heating system can cause circulation noise, see if it is possible to run at a lower ow
Clicking
Action:
Establish when clicking occurs, during heating or hot water production. A surge tank can be installed on the supply line to mix the hot
water with the existing, slightly cooler, water, before it goes out to the radiators.
Locate the clicking noises. Try lubricating lead-ins in walls, ceilings and oors with silicone spray.
Troubleshooting Guide Alarm Sound