37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
29
NOTE: To satisfy the EMC compulsory regulations, which is
required by the international standard CISPR14-1:2005/
A2:2011 in specific countries or districts, make sure you
apply the correct magnetic rings on your equipment
according to the wiring diagram that adhere to the your
equipment.
E. AIR EVACUATION
NOTE: When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. Do not try to
force the valve to open further.
PREPARATION AND PRECAUTION
Air and foreign matter in the refrigerant circuit can cause abnormal rises
in pressure, which can damage the air conditioner, reduce its efficiency,
and cause injury. Use a vacuum pump and manifold gauge to evacuate the
refrigerant circuit, removing any non-condensable gas and moisture from
the system. Evacuation should be performed upon initial installation and
when unit is relocated.
EVACUATION INSTRUCTIONS
1. You can choose to evacuate all indoor unit systems directly through the
main valve, which requires opening all branch valves of connected in-
door units, or evacuate each indoor unit system sequentially through
the corresponding branch valve, which requires opening the main
valve.
2. Connect the charge hose of the manifold gauge to the service port on
the outdoor unit’s low pressure valve.
3. Connect another charge hose from the manifold gauge to the vacuum
pump.
4. Open the Low Pressure side of the manifold gauge. Keep the High
Pressure side closed.
Fig. 28 —Evacuation Instructions - Outdoor Unit
5. Turn on the vacuum pump to evacuate the system.
6. Run the vacuum for at least 15 minutes when choosing evacuation
from each branch valve, or until the Compound Meter reads -
76cmHG (-105Pa). When choosing evacuation through the main
valve, run the vacuum for at least 30 minutes.
7. Close the Low Pressure side of the manifold gauge, and turn off the
vacuum pump.
8. Wait for 5 minutes, then check that there has been no change in
system pressure.
9. If there is a change in system pressure, refer to Gas Leak Check
section for information on how to check for leaks. If there is no
change in system pressure, unscrew the cap from the packed valve
(high pressure valve).
10. Insert hexagonal wrench into the packed valve (high pressure valve)
and open the valve by turning the wrench in a 1/4 counterclockwise
turn. Listen for gas to exit the system, then close the valve after 5
seconds.
11. Watch the Pressure Gauge for one minute to make sure that there is
no change in pressure. The Pressure Gauge should read slightly
higher than atmospheric pressure.
12. Remove the charge hose from the service port.
After confirmation of the above conditions, follow these
guidelines when performing wiring:
• Always have an individual power circuit specifically for the air
conditioner. Always follow the circuit diagram posted on the
inside of the control cover.
• Screws fastening the wiring in the casing of electrical fittings
may come loose during transportation. Because loose screws
may cause wire burn-out, check that the screws are tightly
fastened.
• Check the specifications for the power source.
• Confirm that electrical capacity is sufficient.
• Confirm that starting voltage is maintained at more than 90
percent of the rated voltage marked on the name plate.
• Confirm that the cable thickness is as specified in the power
source specifications.
• Always install an earth leakage circuit breaker in wet or moist
areas.
• The following can be caused by a drop in voltage: vibration of a
magnetic switch, damaging the contact point, broken fuses, and
disturbance of normal functioning.
• Disconnection from a power supply must be incorporated into
the fixed wiring. It must have an air gap contact separation of at
least 3mm in each active (phase) conductors.
• Before accessing terminals, all supply circuits must be
disconnected.
CAUTION
Outdoor unit
Compound
-
gauge
76cmHg
Low
pressure
valve
High
pressure
valve
or
Vacu um
pump
valve
Pr essu r e
gauge
valve
Ch ar g e
hose
Manifold
Gau g e
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