Additional Refrigerant Charge; Electrical And Gas Leak Checks - Midea BREEZELESS Technical Manual

7. Additional Refrigerant Charge

•
After the vacuum drying process is carried out, the
additional refrigerant charge process need to be
performed.
•
The outdoor unit is factory charged with refrigerant.
The additional refrigerant charge volume is decided
by the diameter and length of the liquid pipe be-
tween indoor and outdoor unit. Refer the following
formula to calculate the charge volume.
Diameter of liquid pipe (mm)
6.35
9.52
V: Additional refrigerant charge volume (g).
L : The length of the liquid pipe (m).
Note:
•
Refrigerant may only be charged after performed
the vacuum drying process.
•
Always use gloves and glasses to protect your hands
and eyes during the charge work.
•
Use electronic scale or fluid infusion apparatus to
weight refrigerant to be recharged. Be sure to avoid
extra refrigerant charged, it may cause liquid ham-
mer of the compressor or protections.
•
Use supplementing flexible pipe to connect refriger-
ant cylinder, pressure gauge and outdoor unit. And
The refrigerant should be charged in liquid state.
Before recharging, The air in the flexible pipe and
manifold gauge should be exhausted.
•
After finished refrigerant recharge process, check
whether there is refrigerant leakage at the connec-
tion joint part.(Using gas leakage detector or soap
water to detect).

8. Electrical and Gas Leak Checks

8.1
After installation, confirm that all electrical wiring is
installed in accordance with local and national regulations,
and according to the Installation Manual.
8.1.1
• Check Grounding Work
Formula
Measure grounding resistance by visual detection and with
V=12g/m×(L-5)
grounding resistance tester. Grounding resistance must be
V=24g/m×(L-5)
less than 0.1 Ω.
Note: This may not be required for some locations in the
US.
8.1.2
• Check for Electrical Leakage
During the Test Run, use an electroprobe and multimeter
to perform a comprehensive electrical leakage test.
If electrical leakage is detected, turn off the unit
immediately and call a licensed electrician to find and
resolve the cause of the leakage.
Note: This may not be required for some locations in the
US.
8.2
There are two different methods to check for gas leaks.
• Soap and Water Method
Using a soft brush, apply soapy water or liquid detergent
to all pipe connection points on the indoor unit and
outdoor unit. The presence of bubbles indicates a leak.
• Leak Detector Method
If using leak detector, refer to the device's operation
manual for proper usage instructions.
8.3
After confirming that the all pipe connection points DO
NOT leak, replace the valve cover on the outside unit.
Electrical Safety Checks
Before test run
During test run
Gas Leak Checks
After performing gas leak checks
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