Control Systems - Haldex RF5910XX Manual De Instalación

The Fan Clutch is not recommended for use with modulating type
shutters. On vehicles with radiator mounted air conditioning
condenser, an Interlock (override) Control System is required. This
consists of a Pressure Sensing Switch mounted in the high pressure
portion of the air conditioning circuit and a Solenoid Air Valve in the
control line to the fan. This will engage the fan regardless of engine
temperature whenever conditions are such that the air conditioning
system builds up to about 250 psi. This control is not to be confused
with the limit switch which every air conditioning system normally has
for the purpose of cutting off the compressor whenever the
system pressure reaches approximately 400 psi. There is also a low
pressure cut-off switch to avoid operating the compressor, should the
refrigerant be lost. Vehicles with shutters will also usually have an
interlock with the air conditioning compressor drive to open the
shutters whenever the compressor is operating. One of two methods
may be used to install the Override Switch.
1. A line piercing Saddle Fitting and Pressure Switch may be
installed in the air conditioning compressor discharge line
without discharging the system;
2. Or if desirable, an Override Switch may be installed in the
manifold or fitting on top of the receiver dryer, in which case
the Freon system must be bled off and recharged.
Some operators desire a Manual Override whereby the fan may be
manually engaged regardless of engine need. This is accomplished
very easily with the Bendix Style Fan Clutch by routing the supply air
to the Thermo-pneumatic Valve through a panel mounted TW-1 Valve.
Material required for controls and installation diagrams for systems,
A, B, C, and D are as follows:
FAN CLUTCH CONTROL SYSTEMS
A. Vehicles with No Shutters and No Radiator Mounted Air
Conditioning Condenser (Fig. 16).
1. Thermo-pneumatic Control Valve, normally open, setting 10°
above engine thermostat (see Fig. 20 for P/N identification).
2. Fitting, tubing, etc., as required.
3. Install per diagram (Fig. 16).
FIGURE 16
*
THERMO-PNEUMATIC
CONTROL VALVE
AIR FROM
RESERVOIR
ENGINE
BLOCK
FAN CLUTCH
*
REQUIRED
NEW PARTS
18
RADIATOR