A-304
INST
ALLA
TION PROCEDURE
CEILING
CASSETTE PM
CEILING CASSETTE PM SERIES PMH-P1/P1.6/P2BA
4.
Refrigerant piping work
•
This unit has the flared connections on both indoor and outdoor
sides.
1)
When using commercially available copper pipes:
•
When commercially available copper pipes are used, wrap liquid
and gas pipes with commercially available insulation materials (heat-
resistant to 100
:
or more, thickness of 12 mm or more).
•
The indoor parts of the drain pipe should be wrapped with
polyethylene foam insulation materials (specific gravity of 0.03, thick-
ness of 9 mm or more).
Refrigerant and Drainage Piping Sizes
Item
Model
P1
P1.6, P2
Liquid
OD
{
6.35 (1/4")
OD
{
9.52 (3/8")
Gas
OD
{
12.7 (1/2")
OD
{
15.88 (5/8")
Drainage piping
PVC pipe: OD
{
26 (1")
2)
Installing procedures
1. Remove the flare nuts and caps from the indoor unit.
2. Flare-cut the liquid and gas pipes then apply refrigerating machine
oil (to be locally procured) over the flare-cut seat surface.
3. Quickly connect the refrigerant piping.
∗
Remember to tighten the flare nuts with a double spanner.
4. Slide the supplied pipe cover
3
over the gas piping until it is pressed
against the sheet metal inside the unit.
5. Slide the provided pipe cover
3
over the liquid piping until it is
pressed against the sheet metal inside the unit.
6. Tighten the pipe cover
3
at the both ends (15 - 20 mm) with the
supplied bands
4
.
A
Gas piping
E
Turn the seam upward.
B
Liquid piping
F
Press the pipe cover against the sheet metal.
C
Band
4
G
Refrigerant piping heat insulating material
D
Pipe cover
3
H
Wrap tightly
I
Cut off excess length of band.
5.
Drain piping work
•
Use O. D.
{
26 PVC PIPE for drain piping and provide 1/100 or
more downward slope.
•
Be sure to connect the piping joints using adhesive of polyvinyl chlo-
ride family.
•
Observe the figure for piping work.
•
Use attached drain hose to change the pipe extraction direction.
1
Correct piping
2
Wrong piping
A
Insulation (9 mm or more)
B
Downward slope (1/100 or more)
C
Support metal
K
Air bleeder
L
Raised
M
Odor trap
N
Make as little as possible
O
Make as great as possible (approx. 10 cm)
Grouped piping
D
VP20 (O. D.
{
26 PVC PIPE)
E
Make it as large as possible
F
Indoor unit
G
Make the piping size large for grouped piping.
H
Downward slope (1/100 or more)
I
O. D.
{
38 PVC PIPE for grouped piping.
(9 mm or more insulation)
Refriger-
ant piping
F
E
D
C
I
C
H
A
·
B
G
D
B
M
L
K
D
E
D
H
I
G
D
F
F
F
Max. 20m
0.75–1.5m
N
O
A
B
C
Max. 15cm
Max. 50cm
F
