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HRX-OM-J049-A
Chapter 6 Unit Maintenance
HRG010-W HRG015-W 6.2 Inspection and Cleaning
1st edition : Aug. 2006
Rev. A: May. 2007
6-5
6.2.4 Check during wintertime
Antifreeze of circulating fluid
This unit is resistant to freezing of the circulating fluid during wintertime and
nighttime.
Ensure the following measures are taken in advance if potential frost damage may
occur in response to changes in the installation and use environments (including
operating period and weather).
1. Leave the power on (the [POWER] lamp remains on, and the [RUN] lamp remains off).
2. Fully open valves laid with pipes on your unit to allow the circulating fluid to flow upon
automatic pump operation.
Antifreeze function (automatic pump operation)
(1) After performing steps 1.and 2., automatic pump operation takes place when the circulating
fluid drops 3°C or below.
(2) The circulating fluid is heated by pump power output.
The pump comes to an automatic stop when the circulating fluid reaches 5°C or higher.
(3) The circulating fluid is allowed to be in the 3- to 5-°C range in temperature that is resistant to
freezing.
z Contact expert engineers.
Complete prevention of freezing the fluid may if the unit is installed
in an intensely cold place.
The above usage conditions require an addition of other antifreezing
unit (such as a commercial tape heater).