MHG Heating ThermSelect, Assembly, Commissioning And Maintenance Instructions

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7. Operation Startup
ThermSelect®
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Pump control
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Circulating pump control
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Unscrew pump stopper and turn pump shaft as illustrated below.
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Screw pump stopper back in
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Caution: Collect drops
Fig. 32: Loosen pump stopper
Switching on the device
After proper inspection of the installation, the power connection can
be switched on. For this, activate the installed power switch and au-
tomatic circuit breaker.
Refrigerant dosage
The quantity of refrigerant is determined during operation by mea-
suring and comparing the refrigerant condensation temperature and
the heat pump flow temperature. The heat pump / compressor must
be activated for min. of 10 min. and a flow temperature of approx.
50°C must be reached before measurement or the results will not be
reliable and the amount of refrigerant indicated will not be correct.
The difference between both of these temperatures should be be-
tween 0 and 3 K (condensation temperature - flow temperature).
Test for leak-tightness
Once operating, the refrigerant circuit must be rechecked for lea-
kage using a sensitive leak detection device/substance.