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An optional secondary spray pump may be provided. This pump can be switched easily and maintained while the unit remains
in operation. Only one spray pump may be operated at one time. During normal operation follow the Table 6 to prevent water
stagnation.
Initial Startup:
1. Verify that both bypass lines are open and are not obstructed or kinked. Both bypass valves are to remain open during
normal operation.
2. Open both suction valves. Both suction valves are to remain open during normal operation.
3. Open the discharge valve for the pump that will be in operation
4. Close the discharge valve for the pump that will not be in operation.
Pump Switch Over:
1. Turn off the pump in operation and close the discharge valve for that pump.
2. Open the discharge valve for the pump that will be in operation. NOTE: The discharge valve for the pump in operation
is the only discharge valve that should be open during normal operation.
3. Start the pump that will be in operation.
Pump Removal:
1. Shut down, lock out, and tag out power to the pump motor for the pump that will be removed.
2. Close the bypass valve for the pump that will be removed.
3. Close the suction valve and the discharge valve to isolate the pump that will be removed.
4. Loosen and remove the flange hardware and gaskets from the suction and discharge flanges of the pump volute. See
Figure 16. NOTE: Do not remove hardware from the discharge or suction valves.
5. Loosen and remove hardware that fastens the pump mount to the cantilever pump base or remove the hardware that
fastens the pump feet to the pump mount. See Figure 18.
6. If the pump will be removed for an extended period install blind flanges on the suction and discharge side of the
removed pump. Tee the bypass line of the removed pump into the adjacent bypass line. Open the bypass valve for
the removed pump. See Figure 17.
Vertex™ Evaporative Condenser Operation & Maintenance Manual – Operation Considerations for Accessories
Valve Position for Normal Operation
Discharge Valve
Operational Pump
Non-Operational Pump
Table 6. Valve Position for Normal Operation
Suction Valve
OPEN
OPEN
CLOSED
OPEN
Bypass Valve
OPEN
OPEN
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