Midea MCH2U-18PHH2, Service Manual

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1)
Connect the charge hose to the charging
cylinder and open the 2-way and 3-way
valves.
With the charge hose you disconnected
from the vacuum pump, connect it to the
valve at the bottom of the cylinder.
If the refrigerant is R410A, place the
cylinder bottom-up to ensure liquid charging
is possible.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder
and press the check valve on the charge set
(be careful of the liquid refrigerant).
3) Place the charging cylinder onto the
electronic scale and record the weight.
4) Turn on the air conditioner in cooling
mode.
5) Open the valves (Low side) on the charge
set. Charge the system with liquid refrigerant.
6).When the electronic scale displays the
proper weight (refer to the table), disconnect
the charge hose from the 3-way valve’s
service port immediately and turn off the air
conditioner before disconnecting the hose.
7). Mount the valve stem caps and the service
port
Use a torque wrench to tighten the service
port cap to a torque of 18N.m(13.27 ft·lbs).
Be sure to check for gas leaks.
4.5 Adding Refrigerant after Long-
Term System Operation
Procedure
1)
Connect the charge hose to the 3-way
service port and open the 2-way and 3-way
valve.
Connect the charge hose to the valve at the
bottom of the cylinder. If the refrigerant is
R410A, place the cylinder bottom-up to
ensure liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder
and press the check valve on the charge set
to purge the air (be careful of the liquid
refrigerant).
3) Place the charging cylinder onto the
electronic scale and record the weight.
4) Turn on the air conditioner in cooling
mode.
5) Open the valves (Low side)on the charge
set and charge the system with liquid
refrigerant.
6).When the electronic scale displays the
proper weight (refer to the gauge and the
pressure of the low side), disconnect the
charge hose from the 3-way valve’s service
port immediately and turn off the air
conditioner before disconnecting the hose.
7). Mount the valve stem caps and the service
port.
Use torque wrench to tighten the service
port cap to a torque of 18N.m(13.27 ft·lbs).
Be sure to check for gas leaks.
4.6 Procedure when servicing the
indoor unit refrigeration circuit.
1. Collecting the refrigerant into the
outdoor unit