ENGLISH-100
Water pipe installation
7. If you stop the product for long time or in night time, water pipe circuit may freeze naturally when the temperature
around the outdoor unit is under 0 °C (32 °F). When water pipe circuit freezes, it will cause damage to the plate type heat
exchanger and therefore preventive measure must be taken according to the situation.
- Drain remaining water in the water pipe
- Operate continuous water circulation pump during outdoor unit operation, 1~5 minutes before the operation and
1~5 minutes after operation stops
- Install self-regulating heat cable on the water pipes
8. When inlet water temperature is lower than 10 °C (50 °F), appropriate anti-freeze must be used according to the
temperature. (Set the outdoor unit option switches K21 and K22 according to the usage temperature.)
- When lowest inlet water temperature is -5 °C (23 °F), freezing point of anti-freeze must be lower than -8 °C (17.6 °F)
- When lowest inlet water temperature is -10 °C (14 °F), freezing point of anti-freeze must be lower than -15 °C (5 °F)
9. Install number of auto air vent valve at a point where air may remain within the pipe (such as vertical water pipe). If the
air within the pipe is not vented, it may cause performance decrease or corrosion on the product or pipes.
10. Keep the inlet water temperature within ‘Main usage range’. If not, product may not work continuously.
11. Water scale may occur on the plate type heat exchanger depending on the water quality and the type of plate heat
exchanger so regular chemical cleaning is necessary. When installing water pipes, install a heat source water shut-off
valve and also install the flushing pipe with a ball valves (for chemical cleaning) on the pipe installed between the shut-
off valve and the outdoor unit.
Outdoor unit
Ball valve
(used as cleaning hole)
Cleaning device
Auto air discharge valve
Strainer for pump
Strainer for
outdoor unit
Water inlet pipe
Water outlet pipe
Plate
type heat
exchanger
Flushing pipe
(Install it when cleaning)
Ball valve
(used as cleaning hole)
Ground heat or
closed circuit
cooling tower
12. Before trial operation, connect the flushing pipes installed on inlet and outlet as shown in above illustration. Then, take
appropriate measures (such as blind flange etc) to stop the circulation water from entering the outdoor unit plate type
heat exchanger, and use circulating pump to remove foreign substance within the water pipes and clean the strainer.
When foreign substances accumulates on outdoor unit plate type heat exchanger, it may break the heat exchanger or
cause problem to it.
13. For legal facilities, install digital sensor and flow meter on the water pipe for monitoring.
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Open the valve of the water pipe connected to the outdoor unit after flushing (cleaning foreign substances in
water pipe) is completed.
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Check that air is vented from the water pipe and circulation amount is secured before opening the service valve
on the refrigerant side of the outdoor unit.
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When circulating water stops during outdoor nit operation, it may cause breakage on plate type heat exchanger.
Check the flow of circulation with flow switch or other devices.
CAUTION
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