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26 Pump Switch
Controls operation of proportioning pump hydraulic
drive cylinder. Pump switch has 3 settings:
•
Off - Deactivates pump system and shuts off
hydraulic directional valve. Hydraulic pressure
cannot be generated in this position.
•
Spray- Powers pump; must be set for system to
operate. Used for all normal operation of the
pump system, including pressurizing system
and dispensing chemical.
•
Park - Use during any period of machine inac-
tivity. Pump system is energized so that isocy-
anate pump shaft is retracted into pump
cylinder. Also, shields isocyanate pump shaft
from moisture to limit crystallization during peri-
ods of machine inactivity.
27 Pump Directional Indicator Lights
Indicate direction of proportioning pump travel. Both
lights are off when pump switch is in OFF position or
when chemical pump pressure exceeds setting of
overpressure safety switches.
28 Hose Heater Switch
Energizes hose heat system circuit. In ON position,
green light within switch illuminates.
29 Hose Heat Temperature Controller
Digital display of controller is energized when
control power switch is activated. Hose heater
switch must be in ON position before heating
process begins. (See Digital Temperature
Controllers, page 20.)
30 A- (Isocyanate) Primary Heater Switch
Energizes A-primary heater system circuit. In ON
position, green light within switch illuminates.
31 A- (Isocyanate) Primary Heater Temperature
Controller
Digital display of controller is energized when
control power switch is activated. A- primary heater
switch must be in the ON position before heating
process begins. (See Digital Temperature
Controllers, page 20.)
32 B- (Resin) Primary Heater Switch
Energizes B-primary heater system circuit. In ON
position, green light within switch illuminates.
33 B- (Resin) Primary Heater Temperature
Controller
311392C
Digital display of controller is energized when
control power switch is activated. B- primary heater
switch must be in ON position before heating
process begins. (See Digital Temperature
Controllers, page 20.)
34 Hose Heat Secondary Circuit Breaker
50-amp circuit breaker; protects hose heat system
by limiting current to hose heat element. Must be
ON for heated hoses to function.
35 Control Circuit Transformer
Reduces incoming line voltage to 120 VAC for use
by control circuit system.
36 Hose Power System Controller
Automatically manages electrical current supplied to
hose heat system.
37 Hose Heat System Transformer
Provides isolated low-voltage output for heating
various chemical hose lengths.
35
34
37
F
. 5: Transformer Compartment Electrical
IG
Components
Component Identification
36
11
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