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5. Installing the refrigerant piping
® Freon cylinder
® Scale
© Valve
© 3-way joint
© Vacuum pump
© System analyzer
© Lo-knob
® Hi-knob
© To branch box
@ Outdoor unit
® Stop valve
© Liquid pipe or high-pressure pipe
@ Gas pipe or low-pressure pipe
® Service port
Fig. 5-11
6. Drainage piping work
The figure to the left is an example only.
The stop vaive shape, service port po-
sition, etc., may vary according to the
model.
Turn section ® only.
(Do not further tighten sections © and
together.)
© Charge hose
® Service port
@® 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.
ZA\warning:
When
installing or moving
a unit to another place, do not mix anything other
than specified
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 0z] 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 0z])
Precautions when
using the charge vaive (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 ® in the desired direction, turn section ® only and tighten it.
Do not further tighten sections ® and © together after tightening section @.
Outdoor unit drainage pipe connection
When
drain piping is necessary, use the drain socket or the drain pan (option).
Drain socket
PAC-SG61DS-E
Drain pan
PAC-SG64DP-E
7. Electrical work
[1] Basic systems
OC
OC: Outdoor unit
BC: Branch box
IC:
Indoor unit
RC; Remote controller
|
BC (5-branch type)
A
B
Cc
a"
i
~
RC. |R
:
R
Cc
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.
L V
|
OC
BC (5-branch type)
BC
(8-branch type)
A
B
Cc
D
E|
JA
B
Cc
Ic
Ic
IC
Ic
Ic
ye
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