Flowserve Pump Division - 18
MOTOR THERMAL PROTECTION
The motor winding is protected by three thermal switches installed in series with normally closed contacts.
The contacts will open when the winding temperature within the motor exceeds 275° F (135° C). The
thermal switches must be wired into the motor starter within the control panel such that the motor
automatically shuts down in the event of overheating; see Figure 5: Motor Connection Diagram. Observe
the amperage rating of the thermal contacts at the connected voltage.
WARNING: FAILURE TO PROPERLY CONNECT THE MOTOR THERMAL SWITCHES MAY
RESULT IN PERSONAL INJURY OR PRODUCT DAMAGE AND WILL VOID THE
FACTORY WARRANTY AND THE EXPLOSION PROOF CERTIFICATION.
MOISTURE DETECTION SENSOR
A moisture detection sensor located in the bearing housing will detect failure of the lower mechanical seal
by measuring the electrical conductivity of the fluid in the chamber. Contamination of the cooling fluid
with the pumped fluid will cause the conductivity to increase. The sensor must be wired into an approved
moisture detection sensor relay to illuminate a light on the pump motor control panel with increased
conductivity of the fluid. The unit should be taken off-line for service with illumination of the light.
WARNING FAILURE TO PROPERLY CONNECT THE MOISTURE DETECTION SENSOR MAY
RESULT IN PERSONAL INJURY OR PRODUCT DAMAGE AND WILL VOID THE
FACTORY WARRANTY.
CAUTION: THE LEAKAGE DETECTION CIRCUIT FOR MOTORS NAMEPLATED CLASS 1,
DIVISION 1, GROUP C & D MUST BE SUPPLIED FROM AN ISOLATED SECONDARY
CIRCUIT: 30 Vrms; 42 Vpk; 0.5 ma MAX.
COOLING SYSTEM FILLING
Your pump will require 2.5-5 gallons (9.5-19 liters) of cooling fluid (Royal Purple Barrier Fluid GT22)
depending on the frame size of the motor (see table). In the event that fluid leaks onto the pump or into
the environment, it should be cleaned and disposed of according to the Material Safety Data Sheet.
Motor Frame Size Gallons of Cooling Fluid
23 2.5
24 3.5
25 5
Remove the plugs at the top of the cooling jacket (take care not to damage the O-rings on the washers).
Begin filling through the port marked with an F using a funnel or nozzle. Fill the pump until the oil level
reaches the bottom of the vent port. Replace the plugs and be sure to compress the O-rings.
CAUTION: DURING OPERATION, THE COOLING FLUID WILL INCREASE IN TEMPERATURE
AND PRESSURIZE THE COOLING SYSTEM. PRIOR TO DRAINING THE COOLING
FLUID, THE PUMP SHOULD BE ALLOWED TO COOL. THE COOLING SYSTEM
SHOULD BE OPENED CAREFULLY AS THE COOLING FLUID COULD STILL BE
PRESSURIZED.
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