ENGLISH 43 / 77 CAP. 10 - A/C SYSTEM RECHARGE
M
ULTIGAS 8500 PLUS
10.3 QUICK MODE AND ZERO TOLERANCE RECHARGE MODE
MULTIGAS 8500 PLUS can apply two different refrigerant recharge modes; the first one is called
Quick mode and features the opening of the recharge valve by injecting gas through the HP port. By
the Quick Mode part of the refrigerant remains into the hoses and is compensated by software
calculation.
Whenever the recharge is not completed the UNIT shifts automatically to the Zero Tolerance mode.
The Zero Tolerance function is the second recharge procedure, an alternative to the Quick Mode.
It features a more accurate recharge and guarantees a successful recharge (it however requires a
longer time and the operator's intervention).
If the car A/C system is equipped with both couplers or with LP coupler only, there are two slightly
different working modes; in any case if only the HP coupler is available the Zero Tolerance mode is
not applicable.
With both HP and LP couplers available the Zero Tolerance features the injection of the selected
refrigerant amount into the system through the HP hose; then refrigerant remained into the HP hose
is sucked by the car system – engine and compressor running – through LP (after disconnecting and
closing the HP coupler).
In case the LP coupler only is available the station charges the system with 50% of the selected
amount with car compressor off and waits for 10 minutes before recalling the operator. This wait
time – quite rare since most of cars are equipped with HP coupler too – allows the refrigerant
injected near the compressor – that is LP side – to evaporate to prevent any damage to the
compressor during the admission of liquid phase refrigerant. Then, after car and A/C system switch
ON recharge continues through timed injection of refrigerant through hose LP, such injections start
exclusively if the LP pressure is lower than 3 bar.
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