MacDon M105 - Controls; Air Conditioning Compressor Protection

OPERATOR’S STATION
3.10.3 Contro
ls
A – Temperatur
e Control Dial controls cab temperature.
• Clockwise: In
creases temperature.
• Countercloc
kwise: Decreases temperature.
B–BlowerSwi
tch controls the blower spe ed.
• OFF/LOW/MED
IUM / HIGH
C – Air Condi
tioning Switch controls the A /C system.
•OFF:A/Cdoe
s not operate.
•ON:A/Cope
rates w ith blower switch ON.
Figure 3.22: Climate Controls
A - Te mperature C ontrol
B-Blower
C - Air Conditioning
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 47.
2. Turn blower switc h 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.
3.10.4 Air Conditioning Compressor Protection
The compressor is protected from excessively low and high pressures by two switches that shut down the compressor
to prevent damage to the system.
• T he LOW PRESSURE switch opens when the pressure falls to 2–8 psi (14–55 kPa), and shuts down the
compressor. When the pressure rises to 15–25 psi (103–172 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 shut down by either switch, locate the source of the problem, and correct it before
operating the system.
169890 48 Revision A