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.
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)
Clamp
Insulated tubes
Fig. 18
Apply putty here
Tubing
Fig. 19
4. Air Purging
Service
Air and moisture remaining in the refrigerant system have valve on
undesirable effects as indicated below. Therefore, they | narrow | |
tube side | ||
must be purged completely. | ||
| ||
pressure in the system rises | Service | |
valve on | ||
| ||
operating current rises | wide tube | |
side | ||
| ||
cooling efficiency drops |
|
moisture in the air may freeze and block capillary tubing
water may lead to corrosion of parts in the refrigerant system
With
Air Purging with a Vacuum Pump (for Test Run)
D | Manifold gauge | |||
C | (special for R410A) | |||
B | ||||
valve |
| Vacuum pump | ||
A |
|
| adapter | |
Leave the Lo | Hi | (for preventing | ||
| valve open. |
| reverse flow) | |
|
| (special for | ||
| Open |
| ||
|
| R410A) | ||
|
|
| ||
| Hex wrench |
| Vacuum | |
|
| pump | ||
| Charging hose |
| ||
|
|
| ||
| (special for R410A) |
| ||
Fig. 20
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.)
CAUTION
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.
19
