Test Run / Air Purge - Hitachi YUTAKI M RASM-3WF2E Installation And Operation Manual

!
CAUTION
• Heating at lower water temperatures (approximately 50 °F (10 °C) to 59 °F (15 °C)) and lower
outdoor ambient temperatures (<50 °F (10°C)) can be damaging to the heat pump when
defrosting.
• As a result, Heating up to 59 °F (15°C) when outdoor temperature is lower than 50 °F (10 °C) is
performed by the electrical heater.
• 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 when
defrosting or starting at low water temperature conditions.
• It is recommended start the unit (first power ON) with heater forced OFF and compressor forced
OFF (See "6.2 Setting of DIP switches and RSW
pump and remove possible air into the heater (Check heater completely filled).

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.
PMEN0657 rev.0 - 02/2024
switches"). In order to circulate water by water
Example for PC-ARFH2E2
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