Air Purging - Sanyo CMH1972A Technical & Service Manual
Dc inverter multi-system air conditioner
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Also See for CMH1972A:
- Specifications (2 pages) ,
- Installation instructions manual (27 pages)
Table of Contents
3-7. Taping the Tubes
After a tube has been insulated,
CAUTION
never try to bend it into a narrow
curve, as this may cause the tube
to break or crack.
(1) At this time, the 2 refrigerant tubes (and electrical wire
if local codes permit) should be taped together with
armoring tape. The drain hose may also be included
and taped together as 1 bundle with the tubing.
(2) Wrap the armoring tape from the bottom of the outdoor
unit to the top of the tubing where it enters the wall. As
you wrap the tubing, overlap half of each previous tape
turn. (Fig. 18)
(3) Clamp the tubing bundle to wall, using 1 clamp approx.
every 47" (120 cm).
NOTE
Do not wind the armoring tape too tightly, since this will
decrease the heat insulation effect. Also, be sure the con-
densation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
3-8. Finishing the Installation
After finishing insulating and taping over the tubing, use
sealing putty to seal off the hole in the wall to prevent rain
and draft from entering. (Fig. 19)
4. Air Purging
Air and moisture remaining in the refrigerant system have
undesirable effects as indicated below. Therefore, they
must be purged completely.
G
pressure in the system rises
G
operating current rises
G
cooling efficiency drops
G
moisture in the air may freeze and block capillary tubing
G
water may lead to corrosion of parts in the refrigerant
system
I
Air Purging with a Vacuum Pump
(for Test Run)
G
In order to protect the earth's environment, be sure to use
a vacuum pump to perform the air purge.
(Never perform an air purge by using the refrigerant gas
cylinder or other external gas, or by using the gas inside
the outdoor unit.)
Apply putty here
Service
valve on
narrow
D
tube side
C
Service
B
valve on
wide tube
A
side
Hex wrench
With push-pin
CAUTION
18
Insulated tubes
Fig. 18
Tubing
Fig. 19
Manifold gauge
(special for R410A)
High-pressure valve
Low-pressure
valve
Vacuum pump
adapter
(for preventing
Leave the
Lo
Hi
reverse flow)
valve open.
(special for
Open
R410A)
Charging hose
(special for R410A)
Fig. 20
In order to prevent charging errors
with the air conditioner that uses
R410A, the screw diameter at the
service valve charging port has
been changed. When recharging or
performing other servicing, use the
special charging hose and manifold
gauge.
Clamp
Vacuum
pump
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