Danfoss Heat Pump Troubleshooting Guide download pdf (Page 23)

VMIFB202

Water heater too small in relation to requirement

Action:

Check the requirement and the water heater capacity.

Replace with a larger heater or supplement with an extra heater if necessary.

For example, supplement with an MBH TWS with a connector or an electric heater

The operating pressure switch opens too soon, hot water production is stopped

Action:

Check at what supply temperature the operating pressure switch opens (use refrigerant gauge for opening temp of dierent refrige-

rants to get an indication of the opening pressure. To assure accurate opening pressure, use manometer apparatus which is most

correct.

If the operating pressure switch opens too early, replace it. There is a replacement pressure switch that screws directly onto the

schrader socket (service outlet) to avoid having to open the refrigerant circuit.

Insucient exchange surface to transfer the heat pump’s output to the heater

Action:

Check that the heater is adapted to cope with the heat pump’s output. (7L/kW)

If not, replace the heater (with a larger exchange surface) or supplement with another to pick up the output.

Heat loss in the hot water pipe

Action:

The temperature dierential measured between the heat pump and drain point should not be more than max 1-2 degrees.

Examples of heat loss causes that can be remedied:

Uninsulated hot water pipes - insulate the pipes

Too low temperature set on mixing valve – increase setting

Leaking mixing valve – replace mixing valve

Fault in the tap – replace or remedy the fault

Leakages in the thermostat mixer – replace or remedy the fault

Troubleshooting Guide Temperature or the quantity of hot water

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Danfoss Heat Pump Troubleshooting Guide Page 23