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Farmer 400
Fav 700
Fav 900
Air-conditioning / General system
Function
A
General
12.12.2000
5500
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Capitel
Docu-No.
Index
Date
Version
Page
Function
Text-module
AC system pressure monitor
The high-pressure/low-pressure switch S035 is mounted on the reservoir (drier) (see refrigerant circuit
drawing).
Switch S035 monitors the compression in the reservoir.
If the compression in the system becomes too high (>28 bar), switch S035 interrupts the power supply
to the magnetic clutch Y024.
Possible causes of an excessive pressure in the system are:
Bullet-List
●
Overheating (condenser soiled)
●
Expansion valve iced up
●
System overfilled (too much refrigerant)
Text-module
If the compression in the system becomes too low (<2 bar), switch S035 interrupts the power supply to
the magnetic clutch Y024.
Possible causes of an inadequate pressure in the system are:
Bullet-List
●
Leaks in the system
●
System inadequately filled (too little refrigerant)
Text-module
Maintenance of the air-conditioning (see also tractor operating manual)
Bullet-List
●
Refrigerant 134 a
●
With the compressor running, the white ball must be floating in the upper half of the inspection glass
(on the reservoir). (If necessary, top up with refrigerant.)
●
If the blue ball turns pink. this is an indication of moisture in the system.
●
Various manufacturers offer filling units for evacuating and filling the air-conditioning system. (For
details of how to fill the air-conditioning system, please refer to the filling-unit operating manual.)
●
Even in winter the air-conditioning system should be switched on for approx. 10 min every month,
with ventilation set to recirculation mode. ( Note: If the system remains unused for too long, the
low-temperature oil (compressor lubricant) and the refrigerant can separate!)
●
Air-conditioning compressor v-belt: v-belt tension (strand force) measured in the centre between the
pulleys with an "Optibelt tension gauge", strand force 400+50 N (40+5 Kp) - profile 13mm
Text-module
Power consumption of air-conditioning system
Bullet-List
●
When first switched on approx. 6 kW (= 8 bhp)
●
In operation approx. 4 kW (= 5 bhp)
Operating points: high-pressure/low-pressure switch S035
(High pressure)
(Low pressure)
maximum pressure (bar)
minimum pressure (bar)
Switch open
28 +/- 2
< 2
Switch closed
22 +/- 2
> 2