SECTION 22: HEATING AND AIR CONDITIONING
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
27
7.1.4 Compressor
Maintenance
For complete information on Bitzer A/C
compressor maintenance, installation, torque
chart, approved oils, refer to the following Bitzer
manuals included with the technical publications
in PDF format.
Bitzer kb-540-3 Operating Instructions
Bitzer ke-540-7 Spare Parts List
Bitzer kw-541-2 Exchanging Shaft Seal
Bitzer kt-510-5 Tech Info oils
Bitzer kw-555-3 Tightening Torques
Bitzer kt-100-3 Capacity Control
(unloader)
Bitzer kw-540-1 Maintenance Instruction
7.1.5 Oil Level Check and Oil Change
Oil level should be at ¼ to ¾ of sight glass
height.
Oil Type: Polyoester ISO68.
Bitzer BSE55 (POE)
Castrol Icematic SW 68
Mobil EAL Arctic 68
Shell S4 FR-F 68, Clavus R68
Changing the compressor oil is not necessarily
required for A/C systems which are operated in
a normal fashion. Only impurities from the
system components or operation outside the
application ranges can lead to deposits in the
lubrication oil and darken its color. Change the
oil in this case. At the same time, clean the oil
filter and magnetic plug as well. Determine and
eliminate the cause for operation outside the
application ranges.
However, compressor oil does wear down;
therefore, it is strongly recommended
to change the oil approximately every
4
years (10000-12000 operating hours). Clean
the oil filter and the magnetic plug with
every oil change.
Once every 6 months empty the shaft seal oil
collecting tube. This tube collects oil seeping
through the shaft seal.
FIGURE 28: SHAFT SEAL OIL COLLECTING TUBE
During the 250 hour run-in period of the shaft
seal, an increased oil leak rate may occur.
FIGURE 29: MOUNTING BOLTS TORQUE – 4 BOLTS
7.1.6 Troubleshooting
Guide
A preliminary check may be made by simply
feeling the cylinder heads with the unit in
operation at ambient temperatures of 35
o
F (2
o
C)
and over. The cylinder heads are internally
divided into suction and discharge areas. The
upper central section of the cylinder is the
suction side and it should be relatively cool to
the touch, as opposed to the hot discharge area
which is the lower perimeter area of the cylinder
head. If a valve plate or head gasket is blown, or
a compressor unloader is stuck open, partially
compressed refrigerant vapor will be circulated
between the suction and discharge sides of the
head. The affected cylinder head will then have
a relatively even temperature across its surface
and be neither as hot as the normal discharge
temperature nor as cool as the normal suction
temperature.
