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- 32 -
2) Connect the cable to the outdoor unit
1. Remove the control cover from the unit by loosen-
ing the screw.
Connect the wires to the terminals on the control
board individually.
Connect the wires to the terminals on the control
board individually.
2. Secure the cable onto the control board with the
cord clamp.
3. Refix the control cover to the original position with
the screw.
4. Use a recognized circuit breaker 30A (30k, 32k),
35A (36k, 38k) between the power source and the
unit. A disconnecting device to adequately discon-
nect all supply lines must be fitted.
unit. A disconnecting device to adequately discon-
nect all supply lines must be fitted.
Terminal block
Over 5mm
Cover control
Connecting cable
The power
connecting cable
connecting cable
Main terminal board
Control terminal board
Cover control
After the confirmation of the above conditions, prepare the wiring as follows:
1) Never fail to have an individual power circuit specifically for the air conditioner. As for the method
of wiring, be guided by the circuit diagram posted on the inside of control cover.
2) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from
vibrations to which the unit is subjected during the course of transportation. Check them and make
sure that they are all tightly fastened. (If they are loose, it could cause burn-out of the wires.)
sure that they are all tightly fastened. (If they are loose, it could cause burn-out of the wires.)
3) Specification of power source.
4) Confirm that electrical capacity is sufficient.
5) See to that the starting voltage is maintained at more than 90 percent of the rated voltage marked
on the name plate.
6) Confirm that the cable thickness is as specified in the power source specification.
(Particularly note the relation between cable length and thickness. (Refer to page 28))
7) Always install an earth leakage circuit breaker in a wet or moist area.
8) The following would be caused by voltage drop.
• Vibration of a magnetic switch, which will damage the contact point, fuse breaking, disturbance of the nor-
mal function of the overload.
9) The means for disconnection from a power supply shall be incorporated in the fixed wiring and
have an air gap contact separation of at least 3mm in each active(phase) conductors.
CAUTION
Outdoor Unit
30K, 32K
36K, 38K
- 33 -
1) Checking the drainage
1. Remove the right side panel.
2. Remove the lower panel by the arrow.
3. Remove the left side panel.
(Remove the two screws.)
4. To check the drainage.
■
Pour a glass of water on the drain pan.
■
Ensure the water flows through the drain hose of
the indoor unit without any leakage and goes out
the drain exit.
the indoor unit without any leakage and goes out
the drain exit.
5. Drain piping
■
The drain hose should point downward for easy
drain flow.
drain flow.
■
Do not make drain piping.
Right side panel
Downward slope
Do not raise
Accumulated
drain water
drain water
Tip of drain hose
dipped in water
dipped in water
Air
Waving
Water
leakage
leakage
Water
leakage
leakage
Ditch
Less than
50mm gap
50mm gap
Water
leakage
leakage
Lower panel
Left side panel
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2) Form the piping
1. Form the piping by wrapping the connecting por-
tion of the indoor unit with insulation material and
secure it with two kinds of vinyl tapes.
secure it with two kinds of vinyl tapes.
■
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.
the end of the drain outlet should be routed above
the ground. Secure the drain hose appropriately.
2. 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.
from down to up.
■
Secure the tapped piping along the exterior wall
using saddle or equivalent.
using saddle or equivalent.
3. 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.
to up.
■
Secure the taped piping along the exterior wall.
Form a trap to prevent water entering the room.
Form a trap to prevent water entering the room.
■
Fix the piping onto the wall by saddle or equiva-
lent.
lent.
;;
;;
Taping
Drain
hose
Pipings
Connecting
cable
Trap is required to prevent water
from entering into electrical parts.
from entering into electrical parts.
Seal small openings
around pipings with a
gum type sealer.
around pipings with a
gum type sealer.
Trap is required to prevent water from entering
into electrical parts.
into electrical parts.
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Drain hose
Taping
Pipings
Connecting
cable
cable
Power supply
cord
cord
;;
;;
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
Seal a small opening
around the pipings
with gum type sealer.
around the pipings
with gum type sealer.
Trap
Trap
30K, 32K
36K, 38K
30K, 32K
36K, 38K
- 35 -
4. AIR PURGING
1) Air purging
Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below.
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.
block capillary tubing.
■
Water may lead to corrosion of parts in the refrig-
eration system.
eration 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.
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.
2) Air purging with vacuum pump
1. 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 side
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.
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 side
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.
2. Leak test
■
Connect the manifold valve(with pressure gauges)
and dry nitrogen gas cylinder to this service port
with charge hoses.
and dry nitrogen gas cylinder to this service port
with charge hoses.
■
Pressurize the system to no more than 150 P.S.I.G.
with dry nitrogen gas and close the cylinder valve
when the gauge reading reached 150 P.S.I.G.
Next, test for leaks with liquid soap.
with dry nitrogen gas and close the cylinder valve
when the gauge reading reached 150 P.S.I.G.
Next, test for leaks with liquid soap.
■
Do a leak test of all joints of the tubing(both indoor
and outdoor) and both gas and liquid side service
valves.
Bubbles indicate a leak. Be sure to wipe off the
soap with a clean cloth.
and outdoor) and both gas and liquid side service
valves.
Bubbles indicate a leak. Be sure to wipe off the
soap with a clean cloth.
■
After the system is found to be free of leaks,
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder.
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.
relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder.
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.
Be sure to use a manifold valve for air purging. If it is not
available, use a stop valve for this purpose. The "Hi"
knob of the manifold valve must always be kept close.
available, use a stop valve for this purpose. The "Hi"
knob of the manifold valve must always be kept close.
CAUTION
To avoid nitrogen entering the refrigerant system in a
liquid state, the top of the cylinder must be higher than
its bottom when you pressurize the system. Usually,
the cylinder is used in a vertical standing position.
liquid state, the top of the cylinder must be higher than
its bottom when you pressurize the system. Usually,
the cylinder is used in a vertical standing position.
CAUTION
Lo
Hi
Indoor unit
Indoor unit
Outdoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
cylinder(in vertical
standing position)
Pressure
gauge
gauge
30K, 32K
36K, 38K
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