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10
Installation of outdoor units
10 - 6 Water piping work
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The water pressure resistance of water piping of this outside unit is 1.96 MPa.
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The connection port for water piping is located in the front. The connection ports for drain piping are located in the front and back.
When using the back port, change the cast iron plug from the back to the front and securely close it.
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Because of indoor use, carry out piping work in such a way no water may drop on the outer plate.
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Drain piping should be short and have a slant downwards.
The diameter of drain pipe should be the same as the diameter of unit connection (1/2B) or larger.
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The diameter of water pipe should be the same as the diameter of unit connection (1-1/4) or larger.
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Install an air purge valve in the midway of the water piping to prevent cavitation.
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After completing the drain piping work, make sure that the water runs smoothly without any clogging by dust.
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Do not connect the drain outlet to the water outlet.
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Install a strainer (an optional accessory) in the inlet of water piping within a distance of 1.5 m from the outside unit.
(If sand, waste or rust particles are mixed in the water circulation system, metal materials will become corrosive.)
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Install insulation on the inlet/outlet of water piping to prevent condensation and freezing.
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Install insulation up to the base of heat exchanger as shown in the figure below.
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Install a gate valve for chemical cleaning in an easy position to handle.
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Use water pipes complied with the local and national codes.
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Run the water pump to flush inside of water piping.
Then, clean the strainer.
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If there is a possibility of freezing, take measures to prevent freezing.
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Tighten securely the connection of water piping and socket with tightening torque of 300 N·m or less.
(If a larger torque is applied, the unit may be damaged.)
Air purge
Outlet of water
Inlet of water
Gate valve
Water piping socket
Water piping
Insulation
Heat exchanger
Strainer (an optional accessory)
Drain valve
Connection port to draining piping
Insulation cover
80 mm or less
• Outdoor Units • HEAT PUMP • RWEYQ-MY1
• VRV Systems • Outdoor Units
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