Chapter 4 – Smoke Control Section, Page 4-42__________________________________________________
Wash System – Troubleshooting (Cont.)
Detergent Pump – Initial Operation (Cont.)
If the pump does not self-prime, an air lock may have developed within the pump head and the following
action should be taken:
1.
Hold down the Pump Test Switch, located on the bottom of the electrical junction box on the pump
(Refer to Figure 4-37-1).
2.
Loosen the Top Cap slightly to allow air to be pushed out and then retighten. Repeat as necessary until
liquid climbs up the tube and fills Pump Head and both Poppet Checks are moving up and down slightly.
Note: Be careful not to tighten to much as it will cut the “O” ring.
3.
Check all fittings to ensure an airtight system.
If the pump still does not work properly, check and rebuild or replace the Foot Valve, Pump Head, and/or
Brass Check Valve in the following order:
1.
Foot Valve (Refer to Figure 4-43-1 and Figure 4-43-2)
a)
The Foot Valve should be clean and immersed in the detergent.
b)
To clean the Foot Valve proceed as follows:
1)
Remove Tubing and Foot Valve from the Detergent Reservoir.
2)
Slide the stainless steel tube away from the Foot Valve.
3)
Pull the vinyl tubing off the Foot Valve.
4)
Unscrew the Screen from the Valve Base.
5)
Remove the Ball Check and the “O” Ring from the Screen.
6)
Clean the entire assembly and reassemble.
Figure 4-42-1
Detergent Pump
Pump Test Switch
Pump Head
