GMC 1976 ZEO 6083 Maintenance Manual page 740

SECTION 24E
ROOF MOUNTED AIR CONDITIONER
Contents of this section are listed below:
SUBJECT PAGE NO .
General Information ... . . ... . . ... . . .. . . . .. . . .... . ... . . . . . . ... . ... . ... . . ... . . .. . . . .. . . .... . . .. . . . . . . . ... . . ... . . . . . . . .. . . .. . . . .. . .24E-1
Safety Warnings . . . . .. . . .... . ... . . . .. . . ... . . ... . .... . . .. . . . . . . ... . . .. . . .. . . . .. . . .. . . . ... . . ... . . .. . . . ... . .... . . .. . . . .. . . ... . . ... . ... .24E-5
Electrical Diagnosis . . ... . . ... . . ... . . .. . . . .. . . ... . . ... . . .. . . ... . ... . . .. . . . .. . . .. . . . .. . . .... . ... . . . . . . . ... . . ... . . . . . . . .. . . ... . . .. . .24E-6
Refrigeration System Diagnosis . . . . . . ... . .... . ... . ... . ... . . ... . ... . . ... . . . . . . . ... . . ... . . . . . . . .. . . .... . . . . . . ... . . .. . . . . .24E-10
Cleaning Air Conditioner . . . .. . . .. . . . ... . . . .. . ... . . . . . . ... . . .. . . .. . . . . . . . .. . . . .. . . .... . . .. . . . .. . . ... . . . .. . . . . . . . .. . . .. . . . . .24E-13
Air Conditioner Replacement . .. . . . . . . . .. . . .... . . .. . .... . ... . . .. . . ... . . .. . . . . . . . . .. . . ... . . . . . . . .. . . .... . ... . . ... . . ... . . . .24E-13
Refrigeration System Service. . ... . . . . . . . .. . . ... . . . .. . ... . ... . . .. . . ... . .... . . . . . . . .. . . .. .. . . . . . . . .. . . ... . . ... . . . .. . . .. . . .. .24E-13
Special Tools . . . .. . . . .. . . .... . . .. . . . .. . . . . . . . ... . .... . ... . . . . . . ... . ... . . . . . . ... . . .. . . . .. . . .... . . . . . . . .. . . . . .. . ... . . . . . . . . . . . .. . . . ..24E-15
Specifications . . . .. . . ... . . .. . . . .. . . . ... . . .. . . . .. . . .. . . . .. . . . .. . .... ... . . . .. . .... . ... . . . . . . . ... . . ... . . . . . . . .. . . .... . ... . . ... . . .. . . . . .24E-15
DESCRIPTION
There are three configurations of roof mounted
air conditioners . Two of these are single unit, and the
other is a two unit system .
The single units are 1) a Mark IV unit (figure 1)
with a 13,500 BTU rating 2) a Duo-Therm (figure 2)
with a 13,500 BTU rating .
The two unit system has a Duo-Therm with a
13,500 BTU rating, forward mounted, and another
Figure 1-Mark IV Air Conditioner (Shroud Removed)
GENERAL INFORMATION
ROOF MOUNTED AIR CONDITIONER
24E- 1
Duo-Therm unit with a 11,000 BTU rating, rear
mounted .
The refrigerant system consists of four major
components : The compressor, the condenser, the
capillary tube, and the evaporator . The components
are connected by copper tubing and refrigerant cir-
culates within this closed system .
COMPRESSOR (FIGURE 3)
The compressor pumps the refrigerant through
the discharge line toward the condenser, and pulls
Figure 2-Duo-Therm Air Conditioner (Shroud
Removed)