4-3
doesn’t exceed 120
°
F (49
°
C) when running at full rated
load.
Onan thermostatically controlled shutters can be used to
aid warm-up after starting and keep cold air out during
shutdown. When the discharged air reaches 120
°
F (49
°
C), shutters begin to open; at 140
°
F (62
°
C), the shutters
completely open.
Generator set overheating can result in
engine damage. To avoid this, never operate the
generator set with any of the cooling system compo-
nents removed.
EXHAUST
Pipe exhaust gases outside the enclosure. The exhaust
outlet fits a 1-1/2 inch pipe. Locate the exhaust outlet as
far as possible from the air inlet, to keep gases from reen-
tering the enclosure. Use seamless flexible tubing to
connect the engine exhaust to a rigid pipe extension, if
used, to prevent transmission of vibration.
Inhalation of exhaust gases can result
in severe personal injury or death. Modifying the ex-
haust system can allow poisonous exhaust gases to
escape. Use only original equipment replacement
parts when servicing the exhaust system. Unauthor-
ized modifications will also void the warranty and
cancel the UL Listing/CSA Certification. Liability for
injury or damages due to unauthorized modifica-
tions becomes the responsibility of the person mak-
ing the change.
Because an exhaust system is subjected to detrimental
conditions such as extreme heat, infrequent operation,
and light operating loads, inspect the exhaust system fre-
quently to be sure that it remains fume-tight.
Inhalation of exhaust gas presents the
hazard of severe personal injury or death. Exhaust
gas can easily leak from a faulty manifold. Do not
use exhaust manifold heat to warm a room or com-
partment.
An approved thimble must be used (Figure 4-5) to pass
exhaust pipes through walls or partitions. Build this thim-
ble according to code (see National Fire Protection Asso-
ciation bulletin, Volume 4, section 211 on “Standards for
Chimneys, Fireplaces, and Vents”).
As the exhaust pipe length and number of bends in-
creases, a larger pipe is required, to reduce excessive
exhaust restriction and back pressure.
