Bell & Gossett P81568D Series 1535 - Manual (Page 17)

Make sure that the pump body is full of liquid before startup. If the system does not
automatically fill the pump body with liquid, then you must manually prime the pump.
When you prime the pump from an independent source, you can connect a 1/4 in. pipe
line that is controlled by a valve to one of the side plugs on the volute shell. You can also
replace plugs in the top and bottom of the volute casing with 1/8 in. valves in order to
facilitate priming and draining.
1. Loosen the vent plugs on the pump body.
2. While venting the air from the pump body, rotate the pump shaft a few times by hand.
3. After all air has been purged from the pump, close the vent plugs.
Start the pump
WARNING:
Pressurize the pump body slowly while you check for leaks at all joints with gaskets. Failure
to follow these instructions can result in serious personal injury and/or property damage.
CAUTION:
• Immediately observe the pressure gauges. If discharge pressure is not quickly attained,
stop the driver, reprime, and attempt to restart the pump.
• Observe the pump for vibration levels, bearing temperature, and excessive noise. If
normal levels are exceeded, shut down the pump and resolve the issue.
• Open the suction valve.
• Open any recirculation or cooling lines.
1. Fully close or partially open the discharge valve, depending on system conditions.
2. Start the driver.
3. Slowly open the discharge valve until the pump reaches the desired flow.
4. Immediately check the pressure gauge to ensure that the pump quickly reaches the
correct discharge pressure.
5. If the pump fails to reach the correct pressure, perform these steps:
a) Stop the driver.
b) Restart the driver.
6. Monitor the pump while it is operating:
a) Check the pump for bearing temperature, excessive vibration, and noise.
b) If the pump exceeds normal levels, then shut down the pump immediately and
correct the problem.
7. Repeat steps 5 and 6 until the pump runs properly.
Commissioning, Startup, Operation, and Shutdown
16 Series 1535 Installation, Operation, and Maintenance Manual