Onan DYC Series Operator's Manual And Parts Catalog page 17

COOLING CONNECTIONS
The radiator cooled (standard) set does not require
any external connections except as discussed under
Ventilation. Allow clearance around the set for access
to service the radiator and fan belts. See Figure 6.
Heat Exchanger and Standpipe cooled sets must be
connected to a pressurized supply of cold water.
Make connections to the set with flexible pipe to
absorb vibration. On the cool water line install a
solenoid valve to shut off the flow when the set is shut
down and a rate of flow valve to control engine
temperature. This valve can be either manual or
automatic. Actual rate of flow will depend on inlet
water temperature.
Adjust the flow to maintain water temperature
between 165° Fand 195° F (73.9° C and 90.6° C) while
viewing the water temperature gauge.
Before filling cooling system check all hardware for security. This
includes hose clamps, capscrews, fittings and connections. Use
flexible coolant lines with heat exchanger, standpipe or remote
mounting radiator.
Remote radiator plumbing will vary with installation.
All systems must comply with the following
conditions—
1. Make all connections to the set and to the
radiator, with flexible pipe.
2. Install an auxiliary circulating pump if the
horizontal distance between the engine and
pump exceeds 15-feet (4.65 m).
3. Install a hot-well system to relieve excess engine
water jacket pressure if the top of the radiator is
more than 15-feet (4.65 m) above the center-line
of the engine crankshaft.
R A I N C A P
EXHAUST
W A R N I N G
Inhalation of exhaust gases can result in
death.
Engine exhaust gas must be piped outside building or
enclosure. Do not terminate exhaust pipe near inlet
vents or combustible materials. An approved thimble
(Figure 9) must be used where exhaust pipes pass
through walls or partitions. Pitch exhaust pipes
downward or install a condensation trap (Figure 10)
at the point where a rise in the exhaust system begins.
Avoid sharp bends; use sweeping long radius elbows.
Provide adequate support for mufflers and exhaust
pipes. Refer to Figure 6 for a typical exhaust installa-
tion. Shield or insulate exhaust lines if there is danger
^of personal contact. Allow at least 9-inches (230 mm)
of clearance if the pipes run close to a combustible
wall or partition. Use a pipe at least as large as the 4
inch (101.6 mm) pipe size outlet of the engine with a
flexible portion between the engine and the muffler.
D R I P C A P
H O L E S IN E N D O F
I N N E R S L E E V E
R O O F
W A L L O R P A R T I T I O N
H O L E S IN
E N D O F
I N N E R S L E E V E
N O T E : V E N T I L A T E D T H I M B L E D I A M E T E R 6'
m i T H A N E X H A U S T LINE
L A R G E R
FIGURE 9. EXHAUST THIMBLE
IF E X H A U S T L I N E M U S T B E P I T C H E D U P W A R D .
. C O N S T R U C T A T R A P O F PIPE F I T T I N G S A T
P O I N T O F R I S E
D R A I N C O N D E N S A T I O N T R A P
• P E R I O D I C A L L Y
FIGURE 10. EXHAUST CONDENSATION TRAP
Minimum diametersand maximum lengthsof pipeare
as follows:
Single Exhaust System:
4- inch pipe 75-feet (23 m)
5- inch pipe 250-feet (76.2 m)
6- inch pipe 500-feet (152.4 m)
Maximum permissible exhaust restriction (back
pressure) is 13.5-inches H 2 0 (25.4 mm Hg).
15