Refrigerant Piping And Evacuating - Toshiba Super MMU-AP0092H Service Manual

5
DRAIN PIPING WORK
• Test water drain while checking the operation
sound of the drain pump motor.
(If the operation sound changes from continuous
sound to intermittent sound, water is normally
drained.)
After the check, the drain pump motor runs,
connecting the float switch connector.
(In case of check by pulling out the float switch
connector, be sure to return the connector to the
original position.)
Single phase
220-240V
Power terminals
S(N)
R(L)
White
CN34 (RED)
Red
Black
Pull out connector CN34 (Red)
from P.C. board.
Black
n Perform heat insulating
• As shown in the figure, cover the flexible hose
and hose band with the attached heat
insulator up to the bottom of the indoor unit
without gap.
• Cover the drain pipe seamlessly with a heat
insulator to be procured locally so that it
overlaps with the attached heat insulator of the
drain connecting section.
Wrap the attached heat insulator seamlessly
from the surface of the indoor unit.
Heat insulator of Heat insulator
the drain connecting (To be procured locally)
section (Accessory)
∗ Direct the slits and seams of the heat insulator
upward to avoid water leakage.
6

REFRIGERANT PIPING AND EVACUATING

n Refrigerant Piping
1. Use copper pipe with 0.8 mm or more
thickness. (In case pipe size is Ø15.9, with
1.0mm or more.)
2. Flare nut and flare works are also different
from those of the conventional refrigerant.
Take out the flare nut attached to the main
unit of the air conditioner, and use it.
REQUIREMENT
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 to 3m to clamp the
refrigerant pipe.
Otherwise, abnormal sound may be generated.
CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. Remove dust and moisture from the inside of the
connecting pipes.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes using
VACUUM PUMP .
4. Check the gas leakage. (Connected points)
n Pipe size
AP0092H AP0152H AP0242H
Model MMU- to to to
AP0122H AP0182H AP0562H
Gas
9.5 12.7 15.9
side
Pipe size
(Dia. : mm)
Liquid
6.4 6.4 9.5
side
n Permissible Piping Length and
Height Difference
They vary according to the outdoor unit.
For details, refer to the Installation Manual
attached to the outdoor unit.
Flaring
• Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
• Insert a flare nut into the pipe, and flare the
pipe.
As the flaring sizes of R410A differ from those
of refrigerant R22, the flare tools newly
manufactured for R410A are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.
u Projection margin in
flaring : B (Unit : mm)
Rigid (Clutch type)
R410A tool used Conventional tool used
Outer dia. of
copper pipe
R410A R410A
6.4, 9.5
0 to 0.5 1.0 to 1.5
12.7, 15.9
A
u Flaring dia. meter size :
A (Unit : mm)
+1
A
–0.4
Outer dia.
of copper pipe
R410A
6.4 9.1
9.5 13.2
12.7 16.6
15.9 19.7
∗ In case of flaring for R410A with the conventional
flare tool, pull it out approx. 0.5 mm more than
that for R22 to adjust to the specified flare size.
The copper pipe gauge is useful for adjusting
projection margin size.
B