PAGE 2.1 - 56 OPERATION MARK IV HD J2 TAMPER
REVISED 10 - 2020 CONTROLS BULLETIN 5082505
2.1
2.1.12 Cab Air Conditioner / Pressurizer - See Figure 2.1-36
The Cab Air Conditioner / Pressurizer Controls are located on the top of the air conditioner /
pressurizer unit in the right rear side of the cab wall. The unit consists of the following controls:
(1) Fan Switch
The control knob controls the blower fan operating speed; Off / Low / Medium / High. Rotate the
knob clockwise to increase the blower fan operating speed. Rotate the knob counter-clockwise
to decrease or shut off the blower fan operating speed.
(2) Air Conditioner Switch
The rocker switch controls the air conditioner portion of the unit. Press the upper portion of the
switch to turn On the air conditioner unit and to start the compressor. Press the lower portion of
the switch to shut Off the air conditioner unit and stop the compressor.
(3) Heater Switch
The rocker switch controls the heater portion of the unit. Press the upper portion of the switch to
turn On the heater unit and to start the coolant booster pump to pump warm coolant to the
heater unit. Press the lower portion of the switch to shut Off the heater unit and stop the coolant
booster pump.
(4) Temperature Control
The control knob controls the air temperature. Rotate the knob clockwise to the Red Zone to
Increase the temperature. Rotate the knob counter-clockwise to the Blue Zone to Decrease the
temperature.
(5) Pressurizer Switch
The switch controls the cab pressurizer. Move the switch to the ON position to turn ON the cab
pressurizer. Move the switch to the OFF position to shut OFF the cab pressurizer.
(6) Air Deflectors
The deflectors direct the air flow from the unit’s blower fan in the desired direction. The
deflectors can be Opened or Closed to suit the operator's preference.
(7) Recirculating Filter
The filter cleans the cab interior air that is being re-circulated thru the unit. Clean or replace the
filter as necessary when it becomes dirty.
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