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MZ series
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After the pipe is protected well enough, never bend it to form a small angle; otherwise it would crack or
break.
(3)Wrap the Pipe with Tape
：
a. Bundle the refrigerant pipe and electric wire together with tape, and separate them from the drain pipe to
prevent the condensate water overflowing.
b. Wrap the pipe from the bottom of the outdoor unit to the top of the pipe where it enters the wall. During the
wrapping, the later circle should cover half of the former one.
c. Fix the wrapped pipe on the wall with clamps.
1) Do not wrap the pipe too tightly; otherwise the insulation effect would be weakened. Additionally, make sure the
drain hose is separated from the pipe.
2) After that, fill the hole on the wall with sealing material to prevent wind and rain coming into the room.
4.2.4 Support and protection for pipeline
Support should be made for hanging connection pipe. Distance between each support can not be over 1m.
4.3 Air Purging and Refrigerant Charge
4.3.1 Air purging
(1) The refrigerant has been charged into the outdoor unit before shipment, while additional refrigerant still need
be charged into the refrigerant pipe during the field installation.
(2) Check if the liquid valve and the gas valve of the outdoor unit are closed fully.
(3) As shown in the following figure (Fig.10), expel the gas inside the indoor unit and refrigerant pipe out by the
vacuum pump.
"LO"Knob
"HI"Knob
Vacuuming pump
Manometer
Manometer
Connection hose
liquid valve
Gas valve
Fig 10
(4) When the compressor is not running, charge the R410A refrigerant into the refrigerant pipe from the liquid
valve of the outdoor unit (do not do it from the gas valve).
4.3.2 Additional refrigerant charging
(1) Refrigerant Charge in the Outdoor Unit before Shipment
NOTICE
1) Outdoor unit has been charged refrigerant before delivery. The refrigerant charge is not included those charged
additionally in the indoor unit and the refrigerant pipe.
2) The amount of the additional refrigerant charge is dependent on the diameter and length of the liquid refrigerant
pipe which is decided by the actual yield installation requirement.
3) Record the additional refrigerant charge for future maintenance.
