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Design of VRF SYSTEMS
3. How to install the indoor unit
Design of VRF SYSTEMS
3-7-2. Suspending the Indoor Unit
Depending on the ceiling type:
1. Check the suspension bolt pitch.
2. Ensure that the ceiling is strong enough to support the weight of the unit.
3. To prevent the unit from dropping, firmly fasten the suspension bolts as shown in the figure below.
L*
20 ~ 50
Hole-in-anchor
Hole-in-plug
Insert
Unit: mm
Concrete
Suspension bolt
(field supply)
Hexagonal nut (field supply)
Special washer (field supply)
Special washer (field supply)
Hexagonal nut (field supply)
Suspension bolt (field supply)
Hexagonal nut (field supply)
Special washer (supplied)
Suspension lug
* Choose “L” dimension according to the status of the ceiling.
Fig. 2-145
Fig. 2-146
NOTE
Type
180, 224, 280
Suspension bolt
(field supply)
M10 or 3/8”
It is important that you use extreme care in supporting the indoor unit inside the ceiling.
Ensure that the ceiling is strong enough to support the weight of the unit.
Before suspending the unit, test the strength of each attached suspension bolt.
(1) When placing the unit inside the ceiling, determine the pitch of the suspension bolts referring to the dimensional data given
previously.Tubing must be laid and connected inside the ceiling when suspending the unit. If the ceiling is already constructed,
lay the tubing into position for connection to the unit before placing the unit inside the ceiling.
(2) Screw in the suspension bolts allowing them to protrude from the ceiling as shown in Fig. 2-145. (Cut the ceiling material,
if necessary.)
(3) Suspend and fix the indoor unit using the 2 hexagonal nuts (field supply) and special washers (supplied with the unit) as
shown in Fig. 2-146.
•
The top of the unit must be installed horizontally.
• C
heck the unit is placed horizontally.
Make sure the unit is installed level using a level or a vinyl hose filled
with water.
In using a vinyl hose instead of a level, adjust the top surface of the unit to
the surface of the water at both ends of the vinyl hose and make horizontal
adjustment on all 4 corners of the unit.
If the air discharge side of the unit is installed downward, splashing water
or water leak may occur.
Also, the dust may accumulate inside the drain pan caused by draining
residual water.
• W
hen lifting the unit, do not attempt to hold the electrical component box
in hand.
• D
o not leave the drain pan of the unit downward for long hours.
If doing so, the insulation material can be crushed.
Crushed insulation can lead to condensation.
Horizontal
level
Vinyl hose filled with water
Carpenter’s level
Electrical component box
Drain pan
Vinyl hose filled
with water
Insulation
material
WARNING
CAUTIO
N
3. How to install the indoor unit
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3-7-3. Installing the Refrigerant Tubing
The size of the refrigerant tubing is as shown in the table below.
Table 2-10
Type
224
280
Gas tube
ø19.05
(Brazing connection)
ø22.22
(Brazing connection)
Liquid tube
ø9.52 (Flare connection)
Tightening torque (approximate)
: 34 ~ 42 N •
m
Thickness of connecting tube
: 0.8 mm
ø9.52 (Flare connection)
Tightening torque (approximate)
: 34 ~ 42 N •
m
Thickness of connecting tube
: 0.8 mm
NOTE
To fasten the flare nuts, apply specified torque.
•
When brazing, must be cool the thermistor and the pipe by wet
cloths after removing the insulation tube and the cover plate.
•
When brazing the gas tubing, cool the tubing with dampened
shopcloths as you work, as shown in the figure at right, to protect
the unit’s thermistor from the heat generated by brazing.
•
Pipe insulation must be made after leak detection for tubing
connection area was performed.
•
Be sure to insulate both the gas tubing and liquid tubing.
In addition, wrap the supplied insulation material around the tubing
joints, and fasten in place with vinyl tape or other means.
Failure to insulate the tubing may result in water leakage from
condensation.
•
Plug all gaps at tube through-holes in the unit with insulation or
a similar substance to prevent air leakage.
•
When connecting to the 3WAY VRF system’s outdoor unit, it is
necessary to install 2 units of solenoid valve kit (CZ-P160HR3).
For details, refer to the supplied instructions manual with the
outdoor unit and solenoid valve kit.
•
When using as the fresh air intake mode (excluding Type 180)
with connecting to the 2WAY VRF outdoor unit, it is necessary
to connect with the RAP valve kits (CZ-P160RVK2).
For details, refer to the section “3-7-9. How to Use Fresh Air
Intake Mode”.
Gas tubing
Insulation
tube
Thermistor
(inside unit)
Dampened
shopcloths
(wet cloths)
Longer screw
Cover plate
3. How to install the indoor unit
Design of VRF SYSTEMS
180
ø19.05
(Brazing connection)
ø9.52 (Flare connection)
Tightening torque (approximate)
: 34 ~ 42 N •
m
Thickness of connecting tube
: 0.8 mm
TD831172-03 VRF SYS INDOOR.indb 59
2015/05/25 17:58:17
