MacDon M150 SP - Manual (Page 26)

OPERATOR’S STATION
Form 169017 / 169087 / 169095
24
Revision C
5.10.3 CONTROLS
IMPORTANT
To distribute the oil throughout the system,
perform the following steps whenever the
machine is first started after storage for
more than one week:
a. Turn blower switch to the first position. Turn
temperature control switch to maximum heating,
and A/C control to “OFF”.
b. Start engine, and operate at low idle until engine is
warm.
c. Click A/C switch from "OFF" to "ON" for one
second, then back to "OFF" for 5 to 10 seconds.
Repeat this step ten times.
5.10.4 A/C COMPRESSOR PROTECTION
The compressor is protected from excessively low
and high pressures by two switches that shutdown
the compressor to prevent damage to the system.
• The LOW pressure switch opens when the
pressure falls to 5.1 - 10.9 psi (35 - 75 kPa),
and shuts down the compressor. When the
pressure rises to 17.6 - 26.4 psi (121 - 182
kPa), the switch closes, and allows the
compressor to run.
• The HIGH pressure switch opens and stops
the compressor when the pressure rises to
315 - 335 psi (2172 - 2310 kPa). When the
pressure falls to 220 - 280 psi (1517 - 1930
kPa), the switch closes, and allows the
compressor to run.
If the air conditioning system is shutdown by either
switch, locate the source of the problem, and
correct it before operating the system.
• The Windrower Control Module (WCM)
monitors the compressor operation, and when
it senses rapid pressure changes that cause
the compressor to rapidly engage and
disengage, a “CHECK A/C SYSTEM” will
appear on the CDM display.
5.11 INTERIOR LIGHTS
Two interior lights are installed in the cab
headliner.
A low intensity LED light (A) is located directly
overhead to provide ambient lighting if desired,
and functions only when the road/field light switch
is on.
An on-off switch is located on the light.
The other interior light (B) is located on the
headliner switch panel and the push-on, push-off
button is located on the light.
OUTSIDE AIR SWITCH
Controls Air Source
FRESH AIR - Starts Booster Fan and
Filtered Outside Air Drawn Into Cab.
RECIRCULATE - Stops Booster Fan
and Cab Air Is Recirculated.
AIR CONDITIONING SWITCH
Controls A/C System
OFF - A/C Does Not Operate.
ON - A/C Operates With Blower
Switch On.
TEMPERATURE CONTROL
Controls Cab Temperature
INCREASE - Clockwise
DECREASE - Counter Clockwise
BLOWER SWITCH
Controls Blower Speed
OFF / LO / MEDIUM / HI
A
B