McQuay M4MC Especificaciones descargar pdf (Pagina 18)

(3) Refrigerant Piping

Field Piping

To ensure satisfactory operation and performance, the following points should be noted for the eld piping ar-

rangements of the complete refrigerant cycle.

a) Liquid loops or oil traps must be provided according to the position of the outdoor and indoor units (depend-

ing on whether the indoor unit is above or below the outdoor unit).

b) Field supplied lter dryer should be provided as close to the expansion valve(s) of the indoor unit (evapora-

tor) as possible.

c) Field supplied sight glass must be assembled and mounted next to lter dryer.

Maximum Piping Length and Maximum Number of Bends

When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends in-

creases, system piping resistance to the refrigerant ow increases, thus lowering the cooling capacity, and

as the result the compressor may become defective. Always choose the shortest path and follow the recom-

mendation as tabulated below:

Model

Indoor

Outdoor

MCC 075/100 D/DR

MMC/M4MC

075/100 D/DE

Maximum Length, m 35

Maximum Elevation, m 20

Maximum No. of Bends 8

CAUTION:

1) Our guarantee on the performance of our air-conditioners is strictly revoked if the height, length

and/or the number of bends of the refrigerant piping system installed is beyond the limit above.

2) Bendings must be carefully made so as not to crush the pipe. Use a pipe bender to bend a pipe as

far possible.

(4) Vacuuming and Charging

The pre-charged outdoor unit does not need any vacuuming or charging. However once it is connected, the

connecting pipe line and the indoor unit need to be vacuumed before releasing the R22/R407C from the out-

door unit.

1. Open the service port core cap.

2. Connect pressure gauge to the service port.

3. Connect the line to vacuum pump. Open the charging manifold valve and turn the pump on. Vacuum to -0.1

MPa (-760mmHg) or lower. (Evacuation time varies by the pump but averagely in 1 hour).

CAUTION FOR R407C

Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit

thoroughly and then charge the unit with fresh R407C according to the amount recommended

in the specication.

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McQuay M4MC Especificaciones Pagina 18