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This appendix to the operator’s manual only
pertains to the PLD features of the Clarke Engine.
This section should be used in conjunction with
Sections 1 through 14 of the Operations and
Maintenance Manual, contained within this
document.
15.1.1 Identification/Nameplate
In addition to the information on a standard engine
nameplate, the PLD equipped Clarke Engine
models are also identified by a specific engine
model number on the Clarke nameplate. The
Clarke nameplate also includes: Control Pressure
Set Point, System Maximum Pressure, Variable
Speed Pressure Limiting Control (VSPLC) Rating,
Variable Speed Suction Limiting Control
(VSSLC) Rating, and Minimum Operating Speed.
(Ref. Fig #3).
Figure #25 – PLD / VSPLC&VSSLC nameplates
Example:
Model: C32H0-UFAD12-D
C = Caterpillar base engine prepared by
Clarke
32 = base engine displacement (32 liter)
H = Heat Exchanger cooled
0 = Non-Hazardous Location
UF = Underwriters Laboratories Listed/
Factory Mutual Approved
A = Manufactured in Cincinnati, OH
D = EPA Tier 3 Emissions Certified
12 = A power rating code
D = Suffix to signify a PLD equipped
Engine
– D-VSPLC
– S-VSSLC
– DS-VSPLC / VSSLC
Smart P/N – Clarke internal P/N to establish
engine bill of material
Mfg. S/N = Engine S/N
Rated Speed = Engine Rated Speed
Rated Power = Engine Rated HP
Control Pressure=
Factory Set Point Pressure. Engine will
begin to slow down once this system
pressure is exceeded.
System Max. Pressure=
Maximum Working Pressure of the
Sprinkler System.
VSPLC Rating, “Z”=
Variable Speed Pressure Limiting Control
Rating “Z” Factor. This “Z” value, when
multiplied by the pump differential shut-
off pressure, gives the maximum pressure
trimming capability of the PLD equipped
engine.
VSSLC Rating, “SZ”=
Variable Speed Suction Limiting Control
Rating “SZ” Factor. This “SZ” value will
be used by the manufacturer to determine