Emptying; Additional Refrigerant Charge - ComfortStar BAR4 Service Manual

2 . E m p tyin g
C A U T IO N S :
Do not open the service valve until the leakage inspection and emptying of refrigerant lines and indoor coils
are completed.
1. Evacuate until the micrometer reading is not higher than 350 micrometers, and then close the valve of
the vacuum pump.
2. Observe micrometer gauge. If the micrometer meter does not rise above 500 micrometers within one (1)
minute, the evacuation is completed.
After the evacuation, turn off the vacuum pump and micrometer, and close the valve on the manifold
instrument cluster.
3 . A d d itio n a l R efrig era n t C h arg e
C A U T IO N S :
● Refrigerant cannot be charged until field wiring has been completed.
● Refrigerant may only be charged after performing the leak test and the vacuum pumping.
● When charging a system, care shall be taken that its maximum permissible charge is never
exceeded, in view of the danger of liquid hammer.
● Charging with an unsuitable substance may cause explosions and accidents, so always
ensure that the appropriate refrigerant is charged.
● Refrigerant containers shall be opened slowly.
● Always use protective gloves and protect your eyes when charging refrigerant.
The outdoor unit is charged with refrigerant from factory. Calculate the additional refrigerant
according to the diameter and the length of the liquid side pipe of the outdoor unit/indoor unit.
There are two methods for additional refrigerant charging:
1. During the initial installation, or when the refrigerant quantity of the updated system is
charged, the w eig h in g m eth o d is used. All models have a charge factor of 0.6 oz / ft for
refrigerant pipe length.
Model Refrigerant pipeline length Charge factor
≤25ft Factory charge data on nameplate
All models
0.6 oz / ft
＞25ft
2. When the outdoor ambient temperature is higher than 55°F, recommending use su b co o lin g
(co o lin g m o d e) ch arg in g m eth o d . For outdoor ambient temperature below 55°F, use the
weighing charging method.
R e m ark : P le a s e g o to th e 1 4 th p a rt o f th e in s talla tio n m a n u al for m o re c h a rgin g d e ta ils .
Installation 4