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Konfort Series 700R Service Manual
2.2
Detailed description of the single phases
We would like now to provide a more detailed description of each
operating phase of the equipment. For each
components that are activated and the part of the hydraulic circuit
involved will be shown. The flow diagram of a Konfort 760R will be taken
as reference. From this diagram, the main components of the equipment
(recovery group, compressor, vacuum pump, pressure sensor, electro-
valves, condenser, refrigerant bottle) can be easily identified.
2.2.1 Refrigerant Recovery
During this phase, the equipment activates the following electrical
components:
Pressure sensor (1);
LP electro-valves (only for 760R, 760R Bus and 780R BiGas);
HP electro-valves (only for 760R, 760R Bus and 780R BiGas);
EVREC electro-valve;
Compressor CO;
Condenser fan (2);
Refrigerant load cell (3).
During this phase, the equipment carries out the refrigerant recovery
from the A/C system of the vehicle. The recovered refrigerant does not
end directly into the internal bottle, but it is firstly cleaned from any solid
impurities and moisture, by submitting it to an appropriate filtering.
More specifically, the refrigerant, thanks to the opening of the four HP
and LP electro-valves (only on Konfort 760R, 760R Bus and 780R BiGas
units, in the K705R, K710R and K720R the LP and HP branches have to be
manually opened by means of the HP and LP valves located on the side of
the unit) and of the EVREC electro-valves, is converged into the recovery
hydraulic circuit of the equipment. By entering in the filtering body, the
refrigerant firstly encounters a mechanic filter (4), which aims is that of
blocking any large solid impurity mixed with it.
Then, the fluid passes through an expansion valve (5), whose function
is that of raising the temperature to values close to 0°C. Under these
thermal conditions, the fluid enters the inner chamber of the following
separator filter (6): there the refrigerant (which, at this temperature, is
in the gas phase and is remaining suspended into the chamber) can be
separated from the oil which has been recovered from the A/C system
(which is in the liquid phase and, therefore, tends to settle in the bottom
of the separator filter).
The refrigerant, now completely in the gaseous phase, passes through a
dryer filter DF, where it is purified from any residual moisture.
Copyright © 2014 – TEXA S.p.A.
TEXA Technical Assistance
phase, the hydraulic
11
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