Insulation material
The material used for insulation must have good insulation
characteristics, be easy to use, be age resistant, and must not
easily absorb moisture. (Fig. 5-9)
Drain insulator
and clamp.
Large (supplied)
Packing clamp.
Small
hose band
(supplied)
CAUTION
After a tube has been insulated, never try to bend it into
a narrow curve because it can cause the tube to break or
crack.
Never grasp the drain or refrigerant connecting outlets
when moving the unit.
5-4. Taping the Tubes
(1) At this time, the refrigerant tubes (and electrical wiring
if local codes permit) should be taped together with
armoring tape in 1 bundle. To prevent condensation from
overflowing the drain pan, keep the drain hose separate
from the refrigerant 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.
(3) Clamp the tubing bundle to the wall, using 1 clamp approx.
each meter. (Fig. 5-10)
NOT E
Do not wind the armoring tape too tightly since this will
decrease the heat insulation effect. Also ensure that the
condensation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
Refrigerant tubing and
insulator (not supplied)
Drain pipe and insulator
(not supplied)
Insulation tape
Vinyl clamp
Flare insulator
Seal
The procedure used for
installing the insulator for
both gas and liquid
tubes is the same.
Clamp
Insulated tubes
Drain hose
5-5. 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. 5-11)
6. AIR PURGING
Air and moisture in the refrigerant system may have undesirable
effects as indicated below.
● pressure in the system rises
● operating current rises
● cooling (or heating) efficiency drops
● moisture in the refrigerant circuit may freeze and block
capillary tubing
Fig. 5-9
● water may lead to corrosion of parts in the refrigerant system
Therefore, the indoor unit and tubing between the indoor and
outdoor unit must be leak tested and evacuated to remove any
noncondensables and moisture from the system. (Figs. 6-1a
and 6-1b)
Manifold gauge
Fig. 5-10
34
Apply putty here
Tubing
Vacuum pump
Fig. 6-1a
Fig. 5-11
Outlet
Inlet
Fig. 6-1b