GMC 1976 ZEO 6083 Maintenance Manual page 764

24G- 2 FURNACE
The furnace utilizes a sealed combustion system
with an axial blower assembly . Combustion air is
drawn in from outside the vehicle, passes through the
combustion chamber and returned to the outside.
Warm air inside the vehicle is ducted from the ple-
num on front of furnace to registers located at floor
level. Cold air ducts return air to the rear portion of
the furnace.
The warm air duct on top of the plenum is con-
nected to an auxiliary furnace blower. This heated
air is then supplied to the bathroom module .
NOTE:
If bathroom warm air outlet is located
beside shower head the auxiliary furnace blower
is located in the closet module (See figure 32). If
warm air duct is located on wall below bathroom
sink the auxiliary furnace blower is installed be-
hind the kitchen range/oven (See figure 33).
The furnace operates on 12-volts D .C . and its
wiring diagram is shown in Figure 2.
FURNACE COMPONENTS
CONTROL BOX
The control box contains three control relays,
thermal relay with manual reset, and fuse and
Figure 2-Furnace Wiring
holder. The unit is located on the left side of the
furnace (refer to figures 2 and 3) . If a malfunction
occurs, the control box is replaced as an assembly .
BLOWER ASSEMBLY (FIGURE 3)
The combustion-air portion of blower is sealed so
as to allow no passage of air between it and the
circulating room-air portion of blower. The combus
tion-air blower draws air from the outside atmos-
Figure 3-Furnace Components (Left-Side)