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Forming the pipe
A: Form the piping by wrapping the connecting portion
of the indoor unit with insulation material and secure it
with narrow vinyl tape and wide vinyl tape.
•
If you want to connect an additional drain hose, the end
of the drain outlet should be routed above the ground.
Secure the drain hose appropriately.
B: In cases where the outdoor unit is installed below the
indoor unit perform the following.
•
Tape the piping, drain hose and connecting cable from
down to up.
•
Secure the tapped piping along the exterior wall using
saddle or equivalent.
C: In cases where the outdoor unit is installed above the
indoor unit perform the following.
•
Tape the piping and connecting cable from down to up.
•
Secure the taped piping along the exterior wall. Form a
trap to prevent water entering the room.
•
Fix the piping onto the wall by saddle or equivalent.
18 checking the drainage and forming piping/air purging Kelvinator Air Conditioning
Air purging
Air purging
Air and moisture in the refrigerant system 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.
•
Water may lead to corrosion of parts in the
refrigeration 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.
Air purging with vacuum pump
•
Preparation
Check that each tube (both liquid and gas side tubes)
between the indoor and outdoor units have been
properly connected and all wiring for the test run has
been completed. Remove the service valve caps from
both the gas and the liquid sides on the outdoor unit.
Note that both the liquid and the gas side service valves
on the outdoor unit are kept closed at this stage.
•
Pipe length and refrigerant amount:
Connecting
Air purging
Additional amount of
pipe length
method
refrigerant to be charged
Use vacuum
Less than 5m
–
pump
(2.6-5.3kw) Models:
Use vacuum
(Pipe length-5) x 20g/m
More than 5m
pump
(6.2-8.0kw) Models: (Pipe
length-5) x 40g/m
•
When relocating the unit to another place, perform
evacuation using vacuum pump.
•
Make sure the refrigerant added into the air conditioner
is in liquid form in any case.
Caution in handling the packed valve
•
Open the valve stem until it hits against the stopper.
Do not try to open it further.
•
Securely tighten the valve stem cap with a spanner or
the like.
•
Valve stem cap tightening torque (See Tightening torque
table on page 14).
Flare nut
Refrigerant
Indoor
Outdoor
Stopper
unit
unit
A
Gas side
C
Liquid si de
D
Valve body
B
Packed valve
Half union
Valve stem
Fig .22
Fig .23
When using the vacuum pump
(For method of using a manifold valve, refer to its
operation manual.)
1
Completely tighten the flare nuts, A, B, C, D, connect
the manifold valve charge hose to a charge port of the
low-pressure valve on the gas pipe side.
2
Connect the charge hose connection to the
vacuum pump.
3
Fully open the handle Lo of the manifold valve.
4
Operate the vacuum pump to evacuate. After starting
evacuation, slightly loose the flare nut of the Lo valve
on the gas pipe side and check that the air is entering
(Operation noise of the vacuum pump changes and a
compound meter indicates 0 instead of minus)
5
After the evacuation is complete, fully close the handle
Lo of the manifold valve and stop the operation of the
vacuum pump.
Make evacuation for 15 minutes or more and check that
the compound meter indicates -76cmHg (-1 x 10 Pa).
6
Turn the stem of the packed valve B about 45
counterclockwise for 6~7 seconds after the gas started
coming out, then tighten the flare nut again. Make sure
the pressure display in the pressure indicator is a little
higher than the atmosphere pressure.
7
Remove the charge hose from the Low pressure
charge hose.
8
Fully open the packed valve stems B and A.
9
Securely tighten the cap of the packed valve.
Manifold valve
C ompound meter
P res s ure gauge
-76cmHg
Handle L o
C harge hos e
Low pres s ure valve
Cap
Test running
Safety and leakage check
Electrical safety check
Perform the electrical safety check after completing
the installation:
1
Grounding work
After finishing grounding work, measure the grounding
resistance by visual detection and grounding
resistance tester.
2
Electrical leakage check (performing during test running)
During test operation after finishing installation, the
service person can use the electroprobe and multimeter
to perform the electrical leakage check. Turn off the unit
immediately if leakage happens. Check and find out the
solution ways till the unit operates properly.
Gas leak check
1
Soap water method:
Apply a soap water or a liquid neutral detergent on
the indoor unit connection or outdoor unit connections
o
by a soft brush to check for leakage of the connecting
points of the piping. If bubbles come out, the pipes
have leakage.
2. Leak detector
Use the leak detector to check for leakage.
caution
A
Lo packed valve
B
Hi packed valve
C and D are ends of indoor unit connection.
Indoor unit
check point
Handle H i
Cover
C harge hos e
Vacuum pump
Outdoor unit
check point
Test running
Perform test operation after completing gas leak check at
the flare nut connections and electrical safety check.
•
Check that all tubing and wiring have been properly
connected.
•
Check that the gas and liquid side service valves are
fully open.
•
Connect the power, press the ON/OFF button on the
remote control to turn the unit on.
•
Use the MODE button to select COOL, HEAT, AUTO
and FAN to check if all the functions work well.
Kelvinator Air Conditioning air purging/test running 19
D
C
B
A
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