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10. Installation
1. Diameter of the outdoor unit connection part where water pipe will be connected is 32A. If you install outdoor
units with different capacities, install a flow control valve to secure rated flow for each outdoor unit. Socket
must be connected within below tightening torque. If the tightening torque exceeds below value, it may cause
product breakage.
Outer diameter of water pipe (mm)
Tightening torque (N·m)
10 ~ 20
25
21 ~ 30
50
31 ~ 50
100
51 ~ 80
220
81 ~ 115
600
2. Use certified parts for water pipe system and the water pressure of the water pipe system connected to outdoor
unit must remain under 1.96 MPa.
3. Outdoor unit water pipes must be equipped with valves and other instrumentations as shown in the figure
on the previous page. Strainer and flow switch must be installed within 1~2 m from the entrance pipe of the
outdoor unit. (Strainer must be installed on entrance side)
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When strainer is not installed, sand, dust or rust debris may cause product breakage.
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Make sure to install a flow switch that works at minimum discharge. When optimal discharge level is not
reached, heat exchanger within the outdoor unit may break.
4. Water inlet pipe is located at the bottom part of the heat exchanger and the water outlet pipe is at the top part
of the heat exchanger.
5. Outdoor unit must be installed indoor at room temperature and the water inlet and outlet of the outdoor unit
must be insulated with the heat exchanger as shown in the illustration.
6. Damp-proof, cold reserving and insulation work must be done thoroughly to prevent condensation from forming
on the surface of the product and drain pipes of indoor/outdoor units. When the necessary work is not done
thoroughly, you will waste energy caused by thermal loss and may get property damage during cold seasons
when water pipe freezes and bursts.
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. 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.
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Drain remaining water in the water pipe
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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, 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, freezing point of anti-freeze must be lower than -8°C
‐
When lowest inlet water temperature is -10°C, freezing point of anti-freeze must be lower than -15°C
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.
