Based on its factory settings, the heat pump already provides a frost protection function which involves starting Pump 1 and/or starting the heat pump

during heating, according to multiple start-up thresholds based on outdoor temperature, water temperature and its start-up condition.

If a certain amount of mono ethylene glycol is mixed into the water in the system, the frost protection start-up temperatures can be lowered. Accordin-

gly, a frost protection function has been implemented in the USER INTERFACE, with settable start-up thresholds.

Before starting this function it is necessary, however, to switch off the "factory set" frost protection as follows:

•

Take the front/side panel off of the heat pump.

•

Find the "PCB Main Display"

•

Based on the factory setting, "dip switch 1" is ON, and therefore frost protection is enabled.

•

Set "dip switch 1" on OFF.

Fig. 7: To disable the machine's internal frost protection control, set the switches on For1.

Enclosed documents