6. WATER PIPING WORK
• Carry out insulation of both inlet and outlet water piping securely along with the purge valve. If not insulated,
it may cause water leakage. For water outlet piping, use insulation material of which heat resistant
temperature is not less than 120
°
c. For use under high humidity, strengthen the insulation material for water
piping. If not strengthened, the surface of insulation material may sweat.
• The indoor unit is equipped with water outlet and inlet connection. There is an air vent that is fitted along
with the connection for air purging.
• 3 ways valve is required for cycling off or bypass the chilled water.
• Black steel pipe, polystyrene pipe and copper tube are recommended in the field installation. All types of piping
and connection including the purge valve must be insulated with polyetyrene (ARMAFLEX type or equivalent) to
avoid condensation.
• Do not use contaminated or damaged pipe and fitting for installation.
• Some main fitting components are needed in the system to enhance the capacity and ease the service, such as
gate valve, balancing valve, 2 ways or 3 ways valve, filter, strainer etc.
• During system installation put the O-Ring, provided in the accessory bag, inside the union joint. Refer Fig. 14.
Chiller
Good Control
Table 3
Piping Size
(mm)
15.9mm
7. DRAIN PIPING WORK
(1)
Rig drai
n
pipi
n
g
Bad Control
Worst Control
Fig.15
Tightening T orque
(N-m)
26 ± 2.6
• As for drain work, perform piping in such a manner that water can be drained properly.
• Employ a pipe with either the same diameter or with the diameter larger (excluding the raising section) tha
n
that of the co
nn
ecti
n
g pipe (PVC pipe,
n
o
m
i
n
al dia
m
eter 25
mm
, outside dia
m
eter 32
mm
).
• Keep the drain pipe short and sloping downwards at a gradient of at least 1/100 to prevent air pockets fro
m
forming.
• If the drai
n
pipe ca
nn
ot be sufficie
n
tly set o
n
a slope, execute the drai
n
raisi
n
g pipi
n
g.
• To keep the drain pipe from sagging, space hanging wires every 1 to 1.5 m.
GOOD 0
WRONGX
Fig. 16-1
Fig.16-2
-&
CAUTION-----------------------
Water accumulating in the drainage pipi
n
g can cause the drain to clog.
12