IM-P681-02 ST Issue 2
19
7. Fault finding
Caution
Installation and troubleshooting should be performed by qualified personnel.
Before disconnecting any connections to the MFP14-PPU, every effort should be made
to ensure that any internal pressure has been relieved and that the motive supply line
is isolated to prevent inadvertent discharge of the pump. Verify that all hot parts have
cooled to prevent risk of injury from burns.
Always wear the appropriate safety clothing.
Quick reference trouble-shooting guide
Symptom Cause Check and cure
MFP14-PPU
fails to
operate.
Motive supply valve (item 7)
closed.
Open valves to supply motive
pressure to pump.
Condensate inlet valve
(item 5) closed.
Open all valves, including those
fitted to points (Y) and (Z) to allow
condensate to reach pump.
Condensate discharge
valve (item 5) closed.
Open all valves to allow freedischarge
from pump to condensate return line.
Motive pressure
insufficient to overcome
backpressure.
Check motive pressure and static
backpressure. Ensure motive
pressure is higher than the static
backpressure to give a differential
pressure between 2 and 4 bar g.
Restricted vent.
Ensure that vent line is unrestricted
and self draining to the receiver.
Blocked condensate inlet or
motive supply strainer.
Remove screen from item 6 and clean
or replace.
'U' bend water
seal is broken
and flash
steam
is discharging.
'U' bend water seal empty.
Re-prime 'U' bend with water, see
Section 3.
If flash steam discharges again from
point X this could indicate a blocked
vent line (Y). (Observe Safety note.)
Receiver pressurised
above 0.03 bar (0.4 psi).
Verify vent line is open and
unrestricted.
Large amount
of flash steam
vent line (Y).
Motive steam trap failed open
(steam operated versions only).
Inspect - repair or replace as
necessary.
Motive inlet valve and exhaust
valve of the pump (item 3) is
leaking.
Inspect pump (observe safety note)
repair or replace motive inlet and
exhaust valves as necessary.
Fig. 10 Triplex MFP14-PPU shown
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