16
Soft Start.
During installation of the sprinkler system or initial commissioning, it may be desirable to start the engine at a
reduced speed. Reducing the speed reduces the pressure of the pump discharge. This allows leak detection
to be performed at reduced system pressure and reduces the likelihood of water hammer at start. The process
is simple with a mechanical engine as it has a mechanical linkage that can be removed. No provision exists on
most electronic engines.C18 models from Clarke are equipped with a “Soft Start” feature to allow operation at a
reduced speed. To use the feature, the engine should be started manually from the engine gauge panel. To
use the feature:
Switch the main fire pump controller to the OFF position.
Switch the MODE SELECTOR to MANUAL RUN. (Refer to Figure #8).
Open the engine gauge panel and locate the “Soft Start” switch. It is a momentary toggle switch located in the
upper part of the panel interior. (See Figure #9B).
With your left hand, pull the toggle switch towards you and maintain that position. Then lift and hold the
MANUAL CRANK #1 on the front of the engine gauge panel with your right hand. Release it when the engine
starts.
The engine will run at 1100 rpm until the “Soft Start” toggle is released. Once the toggle is released, the engine
will increase speed at the rate of 10 rpms per second until it reaches rated speed. The “Soft Start” toggle can
be activated again and the engine will immediately return to 1100 rpm.
To Stop the Engine
If engine is started from pump controller use pump controller to stop the engine.
If engine is started from engine instrument panel, lift and hold the Manual Stop Switch (Figure 3-1 item 7).
Close cooling system manual by-pass valve if opened.
IMPORTANT: DO NOT leave the MODE SELECTOR switch in the MANUAL RUN position during AUTOMATIC
operation. (The controller will be unable to stop the engine and DAMAGE MAY RESULT). Note: On C18
Engines you can also start the engine using the manual contactors.
Interior view of engine gauge panel door - BASE dual ECM auto-switching device and green LED
Figure #3-2
Interior view of engine gauge panel.
Figure #3-3
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