Oirect
Flow Installation
With this system, a city or raw water cooling supply
under pressure forces water directly into the engine,
through the engine and to the outlet. An adjustable
valve controls the incoming water flow rate to obtain
correct engine water temperature, as measured at
engine coolant water outlet while the generator set is
operating under full
load.
A solenoid valve is coor-
dinated with the generatorset system to open during
set operation.
Restrict inlet water pressure to a maximum of
7 psi or 48.3 kPa, otherwise engine gaskets
CAUTION
and seals will leak.
Raw water cooling is often undesirable because:
1.
The water supply must be very clean or engine
deposits will result.
2.
A high temperature differential between the cold
incoming water into the engine and warm dis-
charged water can put damaging stresses on
engine components (no overall uniform engine
temperature).
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 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
water temperature and applied
load.
Adjust the flow to maintain water temperature
between 165
0
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.
16
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