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(c) Ensure that the compressor is not exposed to open air for more than the recommended time specified
by its manufacturer (typically less than 0 minutes). Remove the seal-plug only when the compressor is
about to be brazed.
(d) The system should be thoroughly vacuumed to .0 Pa (-700mmHg) or lower. This vacuuming level is more
stringent then R system so as to ensure no incompressible gas and moisture in the system.
(e) When charging R07C, ensure that only liquid is being withdrawn from the cylinder or can. This is to en-
sure that only the original composition of R07C is being delivered into the system. The liquid composition
can be different from the vapour composition.
R32/R125/R134
23% / 25% / 52%
33% / 33% / 34%
Composition of R407C in vapour phase
is different from liquid phase.
(f) Normally, the R07C 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.
Dip-pipe
Liquid withdrawal
Invert cylinder
without dip-pipe
(g) When servicing leaks, the top-up method, commonly practiced for R system, is not recommended for
R07C systems. Unlike R where the refrigerant is of a single component the composition of R07C
(which is made-up of three different components) may have changed during the leak. Consequently, a
top-up may not ensure that the R07C 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 R07C.
Summary of Contents for A4MC 100ER
Page 1: ...Ceiling Concealed D Series ACC D2 2007 ACC 75 D DR ACC100 D DR Models ...
Page 50: ...48 Model AMC A4MC 75 100D ER Note All Dimension are in mm Outdoor Unit ...
Page 53: ...51 Model ACC 75 100D vs AMC A4MC 75 100D Cooling Only 10 WIRING DIAGRAMS ...
Page 54: ...52 Heat Pump Model ACC 75 100DR vs Model AMC A4MC 75 100ER ...