McQuay M4LC Especificaciones descargar pdf (Pagina 34)

by its manufacturer (typically less than 10 minutes). Remove the seal-plug only when the compressor

is about to be brazed.

(d) The system should be thoroughly vacuumed to 1.0 Pa (-700mmHg) or lower. This vacuuming level is

more stringent then R22 system so as to ensure no incompressible gas and moisture in the system.

(e) When charging R407C, ensure that only liquid is being withdrawn from the cylinder or can. This is to

ensure that only the original composition of R407C is being delivered into the system. The liquid

composition can be different from the vapour composition.

(f) Normally, the R407C cylinder or can is being equipped with a dip-pipe for liquid withdrawal. However,

if the dip-pipe is not available, invert the cylinder or can so as to withdraw liquid from the valve at the

bottom.

(g) When servicing leaks, the top-up method, commonly practiced for R22 system, is not recommended

for R407C systems. Unlike R22 where the refrigerant is of a single component the composition of

R407C (which is made-up of three different components) may have changed during the leak.

Consequently, a top-up may not ensure that the R407C in the system is of the original composition.

This composition shift may adversely affect the system performance. It is recommended that the system

by evacuated thoroughly before recharging with R407C.

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McQuay M4LC Especificaciones Pagina 34