McQuay M4MC Specifications download pdf (Page 22)

(5) Additional Charge

• The refrigerant charge has already charged into the outdoor unit. For the piping length of 7.6m, additional

refrigerant charge after vacuuming is not necessary.

• For MMC 075/100D/ER, please refer to the table below:

Liquid Pipe Size, inch Additional Charge, kg/meter

1/2” 0.10

5/8” 0.17

The additional refrigerant charge amount recommended is a guideline for longer piping application. The

actual charge required may be different from the guideline due to different application and variation in site

conditions.

Diagram shows typical charging method:

Note: R407C-Fixlterdryer

 R22-Nil

 R410A-Nil

CAUTION FOR R407C

Avoid prolong exposure of an opened compressor, or the internal part of refrigerant piping to

moist air. The POE oil in the compressor and piping can absorb moisture from air.

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McQuay M4MC Specifications Page 22