53
the capability of VSSLC for a given set of
operating conditions. Contact Clarke with
the following pieces of information about
the installation:
Pump curve (3 points min.)
Suction supply curve (2 points min.)
Elevation of system resistance curve
It will be necessary to run Clarke’s VSSLC
Calculator program to determine
compatibility with the
installation. This can be accessed through
Clarke’s website,
www.clarkefire.com or by consulting the
factory.
Minimum Operating Speed=
Minimum reduced speed the PLD
equipped engine can operate at.
15.1.2 PLD Engine Models
Refer to appendix “A” on page 49 of this manual
for PLD equipped Clarke Engine Models.
15.2 INSTALLATION INSTRUCTIONS
15.2.1 Connections
15.2.1.1 Discharge / Suction Pressure
Engine is provided with a single connection
block for pressure sensing, incorporating
discharge pressure and suction pressure
connections. Connections are labeled
appropriately.
Discharge pressure connection from the
sprinkler system must be made between the
pump discharge flange and the discharge
check valve. (NOTE: The discharge
pressure line must not be connected to the
engine cooling loop.) A ½” (12.7mm)
nominal size inside diameter pressure line
shall be used. Discharge pressure line must be
rated for the maximum potential system
pressure. (See Figure #4).
Suction pressure connection from the sprinkler
system must be made between the OS&Y
valve and pump. A ½” (12.7mm) nominal size
inside diameter suction line shall be used.
Suction pressure line must be rated for
pressures as low as 0 psi absolute. (See Figure
#25).
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