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PMML0600 rev.0 - 06/2022
7
TEST RUN / AIR PURGE
COMMISSIONING
! CAUTION
• Heating at lower water temperatures (approximately 10ºC to 15ºC) and lower outdoor ambient
temperatures (<10ºC) can be damaging to the heat pump when defrosting.
• As a result, Heating up to 15ºC when outdoor temperature is lower than 10ºC is performed by the
electrical heater.
NOTE
In case of Heater Forced OFF (by optional DIP switch setting) these condition is not performed and
heating is performed by Heat Pump. HITACHI is not responsible for its operation.
! CAUTION
It is recommended start the unit (rst power ON) with heater forced OFF and compressor forced OFF
(See “6.2 Setting of DIP switches and RSW switches”). In order to circulate water by water pump and
remove possible air into the heater (Check heater completely lled).
7.4 Test run / air purge
Test run is a working mode used when commissioning the installation. Some settings are made
to let the installer an easy job. Air purge function drives the pump in a way for evacuating air
bubbles in the installation.
Example for PC-ARFH2E
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