Whirlpool R600A, Руководство по обслуживанию

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R600A Sealed System 2017
GENERAL INFORMATION
Refrigerants
Refrigerants
The use of flammable refrigerants in refrigeration systems was
discontinued after the appearance and large scale production
of CFC refrigerants. CFC refrigerants became the refrigerants of
choice because they are low in cost, non-toxic and are not
flammable.
However, studies have shown that CFCs have damaged, and
continue to threaten, the Earth’s delicate ozone layer. In light
of this, the Montreal Protocol was established to manage the
discontinuation of these refrigerants.
Various alternative refrigerants to CFC12 were studied
and some are now being used by the refrigeration industry
worldwide. Among them, are some flammable
refrigerants.
Refrigerants such as (R 600a) isobutane have increased in
popularity with the consumer population primary because of its
environmentally benign properties. More specifically, hydrocarbon
refrigerants are safe to the Earth’s ozone layer.
The Isobutane Refrigerant
Isobutane refrigerant, like other alternative refrigerants,
presents different thermodynamic characteristics different from
those of R 12 or R134a (see figure 1).
Figure 1 shows that isobutane (R 600a) presents lower
vapour pressures than R 12 or R 134a, in the standard
operational temperature range for a refrigeration system.
To better observe the impact of substituting R 12 for R 600a
in refrigeration applications, please see the table.
Fig.1. - Behavior of vapor pressure of R 600a and R 134a in
relation to R 12, according to temperature.
Compressor Label
figure 1