MacDon M155 Operators Manual - Manual (Page 72)

OPERATOR’S STATION
3.10.3 Controls
A – Blower Switch controls the blower speed.
• OFF / LOW / MEDIUM / HIGH
B – Air Conditioning Switch controls A/C system.
• OFF: A/C does not operate.
• ON: A/C operates with blower switch ON.
C – Outside Air Switch controls the air source.
• Fresh Air: Starts booster fan and filtered outside air is
drawn into cab.
• Recirculate: Stops booster fan and cab air
is recirculated.
D – Temperature Control Dial controls cab temperature.
• Clockwise: Increases temperature.
• Counterclockwise: Decreases temperature.
Figure 3.33: Climate Controls
A - Blower Switch B - Air Conditioning Switch
C - Outside Air Switch D - Temperature Control Switch
IMPORTANT:
To distribute the refrigerant oil throughout the
A/C system, perform the following steps when
starting the windrower after more than one week
of storage:
1. Ensure heater shut-off valve at engine is OPEN. Refer
to 3.10.1 Heater Shut-Off, page 55 .
2. Turn blower switch to the first position, turn
temperature control switch to MAXIMUM heating, and
A/C control to OFF.
3. Start engine and operate at low idle until engine
is warm.
4. Click A/C switch from OFF to ON for 1 second, then
back to OFF for 5 to 10 seconds. Repeat this step
ten times.
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