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5. Installing the refrigerant piping
LO
HI
Freon cylinder
Scale
Valve
3-way joint
Vacuum pump
System analyzer
Lo-knob
Fig. 5-11
Fig. 5-12
6. Drainage piping work
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
Drain socket
Drain pan
7. Electrical work
[1] Basic systems
OC
BC
(5-branch type)
A
B
C
IC
IC
IC
RC
RC
R
C
10
Hi-knob
To branch box
Outdoor unit
Stop valve
Liquid pipe or high-pressure pipe
Gas pipe or low-pressure pipe
Service port
* The figure to the left is an example only.
The stop valve shape, service port po-
sition, etc., may vary according to the
model.
* Turn section
only.
(Do not further tighten sections
together.)
Charge hose
Service port
PAC-SG61DS-E
PAC-SG64DP-E
OC: Outdoor unit
BC: Branch box
IC: Indoor unit
RC: Remote controller
BC
(3-branch type)
D
E
A
B
C
IC
IC
IC
IC
IC
R
R
R
R
R
C
C
C
C
C
2 Evacuation (Fig. 5-11)
Evacuation should be made from the service port provided on the outdoor unit's
stop valve to the vacuum pump commonly used for both liquid or high-pressure pipe
and gas or low-pressure pipe. (Make evacuation from both liquid or high-pressure
pipe and gas or low-pressure pipe with the stop valve closed.)
Remember: Never carry out air purge by refrigerant.
Warning:
When installing or moving a unit to another place, do not mix anything other
than specifi ed refrigerant into the refrigeration cycle. If air is mixed, the re-
frigeration cycle may obtain abnormally high pressure, resulting in a burst
pipe.
* A high-precision gravimeter measurable up to 0.1 kg [3.5 oz] should be used.
If you are unable to prepare such a high-precision gravimeter, you may use a
charging cylinder.
Note:
• Use a gauge manifold, changing hose, and other parts for the refrigerant
indicated on the unit.
• Use a gravimeter. (One that can measure down to 0.1 kg [3.5 oz])
Precautions when using the charge valve (Fig. 5-12)
Do not tighten the service port too much when installing it, otherwise, the valve
core could be deformed and become loose, causing a gas leak.
After positioning section B in the desired direction, turn section A only and tighten it.
Do not further tighten sections A and B together after tightening section A.
and
OC
5 (
BC
A
B
IC
IC
RC
RC
Note:
The indoor units can be connected
to any of the 5 connectors (5-branch
type) or 3 connectors (3-branch type)
of the branch box.
b -
a r
n
c
h
y t
p
) e
3 (
b -
a r
n
BC
C
D
E
A
B
IC
IC
R
R
C
C
c
h
y t
p
) e
C
IC
R
C
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