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Konfort Series 700R Service Manual
Image 2.8 – Part of the hydraulic circuit involved into the refrigerant injection
2.3
Evolution of the BiGas management: refrigerant recovery
and injection into Konfort 780R units
Unlike all the other models, Konfort 780R BiGas units provide the chance
to simultaneously manage both the services on the traditional A/C
systems working with R134a and the ones on the new generation
systems, based on the new refrigerant R1234yf.
This innovative architecture has led, inevitably, to a review of the
operating logic, in order to avoid any possible contamination between the
two different refrigerants within the equipment. More precisely, the
splitting of the recovery and injection hydraulic circuits has been
necessary,
in
order
distinguished.
Now, the way in which the equipment performs the hydraulic switching
that allows, depending on the type of A/C system, to deal either with
R134a or with R1234yf, will be detailed described, both for the recovery
phase and for the injection phase .
2.3.1 Recovery of R134a refrigerant
Before proceeding with the R134a refrigerant recovery from the vehicle's
A/C system, the equipment performs a preliminary check of which
refrigerant has been involved in previous service: if the service has been
done on an A/C system operating with R1234yf, then Konfort starts an
automatic clean-up process of the hydraulic circuit, in order to avoid
Copyright © 2014 – TEXA S.p.A.
to
keep
the
flows
18
TEXA Technical Assistance
of
R134a
and
R1234yf
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