Danfoss Heat Pump Troubleshooting Guide download pdf (Page 9)

VMIFB202

Troubleshooting Guide Alarm low pressure

Expansion valve defective or incorrectly set

Action:

Check that the cooling is correct for the specic heat pump model using manometer apparatus.

Also check that the capillary tube is undamaged and that the bulb is correctly installed.

Short active collector, e.g. short or dry bore hole, short surface soil collector

Action:

Check the length of the collector that is being used and compare with the collector length in the dimensioning documentation.

If the active collector is too short, the heat pump cannot receive enough energy from the heat source, which results in the heat pump

requiring an addition to cover the energy requirement for the building.

Collector too long, pressure drop too great

Action:

Check the length of the collector that is being used and that it is connected in parallel, not connected in series, if more than one coil is

being used. Should not dier by more than approx 5°C between brine in and out.NOTE! If a longer collector is being used than

recommended for the specic heat pump, it must be divided into several parallel connected coils.See the instructions for maximum

coil lengths.

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Danfoss Heat Pump Troubleshooting Guide Page 9