Dai VKM100GBMV1, Installation Manual

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3P130768-6L English 6
(4) Install the water supply piping. <VKM-GBMV1 series only>
CAUTION
When installing the water supply piping, wash the pipes with
tap water so that all dirt is removed from them or install a
drain valve somewhere along the piping and drain the pipes
thoroughly until the water flowing through them is clear.
Make sure no cutting oils or detergents get into the pipes.
• Connect the water supply piping with strainer (acces-
sory), other pipings and valves (locally procured) to the
indoor unit as shown in the figure at below.
[PRECAUTION]
•
When installing the water supply piping, do not pass pip-
ing in front of the maintenance cover, as this will make it
impossible to remove the humidifier element.
• Include the water supply piping with strainer (included), a
water supply shut-off valve, and a drain valve (both locally
procured) somewhere along the water supply piping that
can be reached from the inspection hole.
• It is impossible to connect the water supply piping directly
to public piping. Use a cistern tank (of the approved type)
if you need to get your water supply from public piping.
• When using copper piping for the water supply connec-
tions, replace the included half-union joints.
(Refer to Fig. 9)
• Use two spanners when attaching or removing pipes to
the half-union joints.
• Secure the water supply piping without applying pressure.
[PRECAUTIONS]
• Use pure water (city water, tap water or equivalent) that
satisfies the standard regulated by the law of each coun-
try for water supply to the humidifier when performing
anti-sweat work.
• Dirty water may cause valves to clog, dirt to accumulate
in water tanks, and resulting in poor humidifier perfor-
mance. (Never use water from a cooling tower or warm
water for heating.)
• Make sure the supply water is between 5°C and 40°C
in temperature and 0.02 MPa to 0.49 MPa (0.2 kg/cm
2
to
5 kg/cm
2
) in pressure. Include a pressure release valve
between the humidifier and the strainer if the water pres-
sure will be higher than this range.
• Use city water or clean water and take steps to prevent
condensation from forming.
• Also, if the supply water is hard water, use a water soft-
ener because of short life.

Life of humidifying element is about 3 years (4,000
hours), under the supply water conditions of hardness:
150 mg/l.
(Life of humidifying element is about 1 year (1,500
hours), under the supply water conditions of hardness:
400 mg/l.)
Annual operating hours: 10 hours / day × 26 days /
month × 5 month = 1,300 hours
(5) Insulate all piping that passes indoors.
After checking that the water supply piping connections do no
leak, insulate them using the included insulation as shown in
Fig. 10. (Tighten both edges with clamping material.)
(Refer to Fig. 10)
• Wrap the water supply piping with insulation to prevent con-
densation from forming.
• In areas where freezing may occur, always take steps to pre-
vent the pipes from freezing.
7 REFRIGERANT PIPING WORK
<For refrigerant piping of outdoor units, see the installation
manual attached to the outdoor unit.>
<Execute heat insulation work completely on both sides of
the gas piping and the liquid piping. Otherwise, a water
leakage can result sometimes.
Use insulation that can withstand temperatures of at least
120°C. Improve insulation of refrigerant piping according
to the installation environment.
Refer to the following information as a guide.

• The ambient temperature is 30°C and humidity is 75% to
80%: 15 mm min. in thickness.
• The ambient temperature exceeds 30°C and the humidity
exceeds 80%: 20 mm min. in thickness.
Without reinforcement, condensation may form on the sur-
face of the insulation.>
<Before refrigerant piping work, check the type of R410A
refrigerant is used. (Proper operation is not possible if the
types of refrigerant are not the same.)>
CAUTION
This product must use a refrigerant (R410A). Obey the
following items.
• Use a pipe cutter and flare suitable for the type of
refrigerant (R410A).
• Apply ester oil or ether oil around the flare portions
before connecting.
• Only use the flare nuts included with the unit. Using
different flare nuts may cause the refrigerant to leak.
• To prevent dust, moisture or other foreign matter
from infiltrating the tube, either pinch the end or
cover it with tape.
• Do not allow anything other than the designated refrig-
erant to get mixed into the refrigerant circuit, such as
air, etc. If any refrigerant gas leaks while working on
the unit, ventilate the room thoroughly right away.
• The outdoor unit is charged with refrigerant.
• Be sure to use both a spanner and torque wrench together,
as shown in the drawing, when connecting or disconnecting
pipes to the unit.
(Refer to Fig. 11)
• Refer to the “Table 1” for the dimensions of flare nut spaces.
W a ter su pply piping
with s tr a iner
W a ter su pply s h u t-off
v a lve
W a ter su pply pipe
(Loc a lly proc u red)
(Loc a lly proc u red)
(Loc a lly proc u red)
(Loc a lly proc u red)
(Acce ss ory)
C a p
Dr a in v a lve
Fl a re n u t
Copper piping
Y- s h a ped
s tr a iner
Remove
Exch
a nge the incl u ded h a lf- u nion joint
Unit
s ide
(Acce ss ory) (Acce ss ory)
H a lf- u nion joint
Repl a cement of joint s when us ing copper connection s
W a ter
su pply
piping
s ide
Fi g . 9
Cl a mp
In su l a tion
(For w a ter su pply piping)
(Acce ss ory)
(Acce ss ory)
Fi g . 10
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