113
c)
Ensure that the compressor is not expose to open air for more than the recommended time specified by
its manufacturer (typically less than 10 minutes). Removed the seal-plugs 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 than 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When charging R407C, ensure that only liquid is being withdrawn from the cylinder or can.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 vapor composition.
Composition of R407C in vapour phase
is different from liquid phase.
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 leak, the top-up method, commonly practiced for R22 system, is not recommended for
R407C system. Unlike R22 where the refrigerant is of a single component, the composition of R407C,
which 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 original composition. This composition shift
may adversely affect the system performance. It is recommended that the system should be evacuated
thoroughly before recharging with R407C.
R32/R125/R134
33% / 33% / 34%
23% / 25% / 52%
Dip-pipe
Invert cylinder
without dip-pipe
Liquid
withdrawal
Содержание M4MC075D
Страница 71: ...70 Blower Performance Curves BLOWER PERFORMANCE CURVE MDB 075D...
Страница 72: ...71 BLOWER PERFORMANCE CURVE MDB 100D...
Страница 73: ...72 BLOWER PERFORMANCE CURVE MDB 125D...
Страница 74: ...73 BLOWER PERFORMANCE CURVE MDB 150D...
Страница 75: ...74 BLOWER PERFORMANCE CURVE MDB 200D...
Страница 76: ...75 BLOWER PERFORMANCE CURVE MDB 250D L s 70 65 60...
Страница 77: ...76 BLOWER PERFORMANCE CURVE MDB 300D...
Страница 78: ...77 BLOWER PERFORMANCE CURVE MDB 400D...
Страница 79: ...78 BLOWER PERFORMANCE CURVE MDB 500D...
Страница 80: ...79 BLOWER PERFORMANCE CURVE MDB 075D DR VERY HIGH STATIC...
Страница 81: ...80 BLOWER PERFORMANCE CURVE MDB 100D DR VERY HIGH STATIC...
Страница 82: ...81 BLOWER PERFORMANCE CURVE MDB 125D DR VERY HIGH STATIC...
Страница 83: ...82 BLOWER PERFORMANCE CURVE MDB 150D DR VERY HIGH STATIC...
Страница 89: ...88 MODEL MDB 500D4 DR4 NOTE 1 WITH SEQUENTIAL CONTROLLER 2 VERTICAL AIR DISCHARGE...
Страница 90: ...89 Outlines And Dimensions Outdoor MODEL MMC 075 100D DR MODEL MDB 125D DR...
Страница 91: ...90 MODEL MMC 150D DR OUTDOOR UNIT WITH BALL VALVE MODEL MMC 075D...
Страница 92: ...91 MODEL MMC 100D MODEL MMC 125D...
Страница 93: ...92 MODEL MMC 150D...
Страница 97: ...96 MODEL MDB 400D4 vs MMC 100D x 4 MDB 500D4 vs MMC 125D x 4 WITH SEQUENTIAL CONTROLLER...
Страница 99: ...98 MODEL MDB 125DR vs MMC 125DR WITH U1 125 SLM3 HANDSET MODEL MDB 150DR vs MMC 150DR WITH U1 125 SLM3 HANDSET...
Страница 101: ...100 MODEL MDB 400DR4 vs MMC 100DR x 4 MDB 500DR4 vs MMC 125DR x 4 WITH SEQUENTIAL CONTROLLER...
Страница 102: ...101 Refrigerant Circuit Diagram MODEL MMC 075D 100D 125D 150D...
Страница 103: ...102 MODEL MLC 061C...
Страница 104: ...103 MODEL MMC 075DR 100DR 125DR 150DR R22 M4MC 75DR 100DR 125DR 150DR R407C...
Страница 177: ...2004 McQuay International 1 800 432 1342 www mcquay com ISO 9002 REGISTERED...