Procedure For Filling Engine; Providing Adequate Raw Water Supply To The Engine Heat Exchanger; Raw Water Supply; Cooling Loop - Clarke C18H Instruction Manual

Inhibitors become depleted through normal
operation; additional inhibitors must be added to
the coolant as required to maintain original
strength levels.
To properly check inhibitor concentration, it may be
necessary to contact your local Service/Dealer for
assistance. Refer to Parts Information Section to
obtain the part number for the factory Coolant Analysis
Kit. This kit can be purchased for a nominal fee for
analyzing the conditions of the engine's coolant.

3.4.6 Procedure for Filling Engine

During filling of the cooling system, air pockets may
form. The system must be purged of air prior to being
put in service. This is best accomplished by filling
with a pre-mix solution. Refer to Figure #18 for proper
fill level.
Caution: Do not overfill cooling system. A
pressurized system needs space for heat
expansion without overflowing.
Install the pressure cap, start and run engine for
approximately 5 minutes to purge the air from the
engine cavities.
When verifying that the coolant is at a safe operating
level, it is best to wait until the engine temperature
drops to approximately 120ºF (49ºC), or lower, before
removing the pressure cap.
Remove the pressure cap and refill to the proper fill
level. To continue the de-aeration process, start and
run engine until the temperature stabilizes at
approximately 160°-200° (71°-93° C) or run engine for
25 minutes, whichever is longer. During this warming
process, you may see coolant coming from the
overflow tube attached at the pressure cap location.
Allow engine to cool, then remove the pressure cap
and refill to the proper fill level.
Caution: Do not remove pressure cap while coolant is
at normal operating temperatures. Possible personal
injury could result from the expulsion of hot coolant.
3.4.7 Providing Adequate Raw Water Supply to the
Engine Heat Exchanger

3.4.7.1 Raw Water Supply

Most Clarke diesel engine fire pump drivers are heat
exchanger cooled and some engines also have a charge
air cooler (CAC) that uses raw water to cool the air
before entering the intake manifold. If you have a
radiator cooled Clarke engine, you can disregard this
section. Heat exchanger cooled diesel engine drivers
require a clean source of pressurized water from the
discharge side of the fire pump. To prevent
overheating, the loop must provide a specified
minimum amount of raw water flow.

3.4.7.2 Cooling Loop

Note: Engine may include a cooling loop as an
optional feature and has not been evaluated by UL
as part of a UL Listed fire pump driver.
Clarke cooling loops are FM Approved to meet
standard sizing conditions of 50% blocked wye
strainers, 100degF (38degC) raw water inlet
temperature, 80 psi inlet pressure, and 10 psi
available at the engine outlet.
Figure #19 shows the standard NFPA 20 cooling loop
piping arrangement. The cooling loop consists of an
Automatic flow line with a 12v or 24v solenoid valve
(HSC and ES pump applications only) that is energized
to open anytime the engine is called upon to run from
either the fire pump controller or from the engine
gauge panel.
37
Figure #18