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NOTE
▪ The supply water MUST be clean tap water, industrial
water or clean underground water. Do NOT use purified
or softened water.
▪ Do NOT use once-through water. It may cause
corrosion.
4 .4 .2
Water circuit requirements
INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
NOTE
Use water pipes compiled with the local and national codes.
▪ The water pressure resistance of water piping of this outside unit
is 464 psig (3.2 MPa).
▪ 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.
▪ In indoor use, piping work should be such that no water drops on
the outer plate.
▪ The lateral protruding section of the drain piping should be short
(within 15-3/4 inch (400 mm)) and installed in a downward
direction.
The diameter of drain pipe should be the same as the diameter of
unit connection (3/8 inch (9.5 mm)) or more.
▪ The diameter of water pipe should be the same as the diameter of
unit connection (1-1/4 inch (31.8 mm)) or more.
▪ Install an air purge valve in the midway of the water piping to
prevent cavitation.
▪ After completing the drain piping work, make sure that the water
runs smoothly without any clogging by dust.
▪ Do not connect the drain outlet to the water outlet.
▪ Install a strainer (standard accessory) in the inlet of water piping
within a distance of 4.9 ft (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.)
▪ Install insulation on the inlet/outlet of water piping to prevent
condensation and freezing.
At installing insulation on water in/outlet pipe, use Polyurethane
foam thickness 3/16 inch (5 mm) for insulation of water piping
socket on heat exchanger.
▪ Install insulation up to the base of heat exchanger.
▪ Install a gate valve for chemical cleaning in an easy position to
handle.
▪ Use water pipes compliant with the local and national codes.
▪ Run the water pump to flush inside of water piping.
Then, clean the strainer.
▪ If there is a possibility of freezing, take measures to prevent
freezing.
▪ Connect water piping and heat exchanger via pipe adaptor
(accessory)
(ISO228-1•G1-1/4B→ANSI-ASME B1.20.1•1-1/4-11.5NPT)
▪ Tighten securely the connection of water piping and socket with
tightening torque of 220 ft·lbf (300 N·m) or less.
(If a large torque is applied, the unit may be damaged.)
RWEQ96~432TAYD∗ + RWEQ96~432TATJ∗
VRV W T-Series water-cooled system air conditioner
Example:
a
c
b
d
e
j
n
e
k
l
a
Air purge (field supply)
b
Water outlet
c
Water inlet
d
Shut-off valve (field supply)
e
Water connection
f
Water piping (field supply)
g
Insulation (field supply)
h
Pipe adaptor (accessory)
i
Heat exchanger
j
Strainer (accessory)
k
Drain valve (field supply)
l
Drain connection
m
Insulation cover
n
Flow switch (field supply)
4 .4 .3
Maintenance of plate-type/brazed plate
heat exchanger
CAUTION
A brazed plate-type heat exchanger is used for this unit.
Because its structure is different from a conventional type
heat exchanger, it must be handled in a different manner.
When designing the equipment
1 Install a strainer (standard accessory) at the water inlet side
adjacent to the outside unit in order to prevent any foreign
materials such as dust, sand, etc. from entering.
2 Depending on the water quality, scale may stick to the plate-
type heat exchanger. In order to remove scale, it is necessary
to use chemicals to clean it at regular intervals. To this end,
install a gate valve in the water piping. Set up a piping
connection port on the piping between this gate valve and the
outside unit for cleaning by chemicals.
3 For the purpose of cleaning and water drain-off from the outside
unit (water draining during a long period of non-use in winter,
draining upon starting of season-off), install an "air discharge
valve" and a "water draining plug" at the inlet/outlet ports of
water piping. In addition, install an "automatic air discharging
valve" at the top of riser piping or at the top of a portion where
air tends to stay.
4 Independent of the piping inlet of the outside unit, install a
cleanable strainer at a portion close to the pump piping inlet.
5 Carry out complete cooling/thermal insulation of water piping
and outside dehumidification. If complete cooling or thermal
insulation has not been carried out, any damage may be
caused during severe winter due to freezing, in addition to
thermal loss.
6 When you stop operation during night or winter, it is necessary
to take measures to prevent water-related circuits from natural
freezing in the area the ambient temperature drops below 32°F
(0°C) (by water drain off, keeping the circulation pump running,
warming up by a heater, etc.) Freezing of water related circuits
may result in any damage to the plate-type heat exchanger.
Therefore, take appropriate measures depending on the
circumstances of use.
4 Preparation
m
g
f h
i
Installation manual
17
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