18
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Piping installation
Installer and user reference guide
80
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
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Water piping
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Tightening torque
. Securely tighten the water piping with a
tightening torque of ≤300 N•m. Overtightening results in damage to the unit.
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Field supply components – Water.
Only use materials that are compatible with
water used in the system and with the materials used in the outdoor unit.
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Field supply components – Water pressure and temperature.
Check that all
components in the field piping can withstand the water pressure and water
temperature.
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Water pressure.
The maximum water pressure is 37 bar. Provide adequate
safeguards in the water circuit to ensure that the maximum pressure is NOT
exceeded.
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Drainage – Low points.
Provide drain taps at all low points of the system in order
to allow complete drainage of the water circuit.
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Drainage – Clogging.
Make sure that the water runs smoothly without any
clogging by dirt.
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Drainage
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Lateral length
. Lateral length of drainage should be as short as
possible (≤400 mm) and installed in a downward direction. The diameter of the
drain pipe must be the same as the diameter of the pipe on the outdoor unit.
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Non-brass metallic piping.
When using non-brass metallic piping, insulate the
brass and non-brass properly so that they do NOT make contact with each other.
This to prevent galvanic corrosion.
18.2.3 Handling the brazed plate heat exchanger
INFORMATION
A brazed plate heat exchanger is used. Because of a different structure from a
conventional heat exchanger, it MUST be handled in a different manner.
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Install a water filter at the water inlet in order to prevent foreign materials such
as dust, sand,… from entering the plate heat exchanger.
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Scale can stick to the plate heat exchanger depending on water quality. To
remove scale, cleaning is necessary at regular intervals using chemicals. Install a
shut-off valve at the end in the water piping. Install a piping connection port on
the piping between this shut-off valve and the outdoor unit for cleaning by
chemicals.
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For cleaning and water draining of the outdoor unit (long period of non-use or
during non-use in winter), install an air purge plug (for joint use with cleaning
port) (field supply) and a water draining plug at the inlet/outlet ports of the
water piping. Additionally, install an automatic air purge valve (field supply) at
the top of rising piping or at the top of a portion where air tends to stay.
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Install an additional cleanable filter (field supply) in front of the pump inlet.
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Carry out complete cooling/thermal insulation of the water piping and the
outdoor unit drain piping. If insulation has not been carried out, the unit may
sustain damage during severe winters due to freezing, in addition to thermal loss.
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When you stop the unit during night or winter, take measures to prevent water
circuits from natural freezing in areas where the ambient temperature drops
below 0°C (by water drain off, keeping the circulation pump running, warming up
by a heater,…). Freezing of water circuits may result in damage to the plate heat
exchanger. Therefore, take appropriate measures depending on the
circumstances.
