COOLING
CONNECTIONS
The radiator cooled (standard) set does not require
any external connections except as discussed under
Ventilation. Allow clearance around thesetforaccess
to service the radiator and fan belts. See Figure 7.
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
watertemperature.
Adjust the flow to maintain water temperature
between 165°
F
and 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.
GENERAL
WATER
FILTER
Electric generating sets can be equipped with an
optional cooling system filter (corrosion resistor).
This filter is a unit which directs coolant from the
system through a filtering and treating device. It
softens water, neutralizes acidity and protects against
corrosion by the use of a replaceable chemically
activated filtering element. In addition, the unit
con-
tains a sacrificial metal plate which arrests pitting of
metals in the system by electro-chemical action.
Exact location of filter will vary because of other
optional equipment which may also be installed.
Two types of elements are available from your Onan
dealer or distributor.
1.
Regular formula (chromate).
2.
PAF formula (borate) year round type.
jCAUTION
Do not use anti-freeze with an antMeak
formula. The stop-leak element can prevent
or retard the flow through the filter, thereby eliminating the filtering
process completely.
The regular formula can be used with plain water ahd
selected antifreezes. The best protection results will
be gained by using the borate formula element with a
. permanent antifreeze.
ONAN recommends that shutoff valves be installed to
the engine side of the inlet and outlet of the coolant
filter, for ease in changing elements. Anothersugges-
tion,
if so desired, a thick-walled pyrex tube can be
inserted and clamped into the line at a convenient
point to serve as a flow indicator. This flow indicator
will act in the capacity of a sight gauge to observe
general condition, possible air pockets and presence
of contaminants in the coolant flow. See Figure 10for
installation recommendations-.
WATER OUTLET
FROM HEATER
WATER HEATER
FLOW
INDICATOR
WATER INLET LINE
FROM BLOCK
SHUT-OF
VALVE
. COOLING SYSTEM
FILTER
FIGURE 10. COOLING SYSTEM (RADIATOR)
WATER
JACKET HEATER
(Optional)
This heater is installed to maintain an elevated engine
temperature in lower ambient temperature
applications. It heats and circulates engine coolant,
and is thermostatically controlled.
11
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