User Manual

43
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When the dierential set point is reached both the audible
and visual alarms will be triggered and will remain engaged
until both the alarm condition is corrected and the
alarm-reset button is pressed (if the alarm-reset button is
pressed but the dierential pressure is beyond the set point,
the alarms will re-engage immediately). After the strainer
is cleaned and put back in service, the dierential pressure
should return to 1 psi.
Auxiliary Contacts
The PDA option is equipped with a remote alarm feature.
The remote alarm contacts are located at the two black and
red banana clip posts (See Figure 21). The alarm can be set
up in one of two ways:
1. A remote alarm signal of 12 VDC can be sent to a central
monitoring station or
2. A set of auxiliary contacts will indicate a “closed”
condition when the alarm activates. (Locate the
Auxiliary Contact Schematic inside the PDA box by
removing the four screws on the cover plate).
Water Resistance
The Pressure Dierential Alarm Controller is water-resistant,
but not water proof. Do not install below ground level
where the box can be submerged in water. Do not remove
the cover plate from the PDA controller. Keep the cover
tightly sealed on the module during normal operation.
Problem
•
Seals damaged or worn out • Install repair kit
•
Valve is not stopping at proper closed position
•
Adjust limit switches
Valve stem leaks
• Worn stem seals •
On metal valves: tighten stem packing nut 1/2 turn.
CAUTION! Over tightening stem nut could cause drag on
motor and trip internal circuit breaker. May require repair kit
or new valve.
•
Loose body bolts or excessive operation pressure
•
Check bolts and observe recommended pressure ratings
•
Defective seals
•
Install repair kits or new valve
•
Swollen seals or product buildup in valve chamber
•
Check valve for compatibility with product, may require valve
cleaning or new valve
•
Valve bolts too tight
•
Loosen bolts slightly
•
Stem nut too tight
•
Loosen stem nut slightly
Troubleshooting for ATF Package
Solution
Valve is leaking past ball
Valve hard to turn
Valve body leaks
Table 3