Landa EHW Series Operator's Manual page 18

Maintenance
PROBLEM
WATER ESCAPING
FROM FILL PIPE ON HEAT
EXCHANGER
UNLOADER DOES
NOT GO INTO
BYPASS OR
WILL CYCLE ITSELF
SPIKES
TOO HIGH
SYSTEM WON'T
COME UP
TO PRESSURE
18
POSSIBLE CAUSE
Cold water added to heat exchanger
Ruptured coil or leaking
Spray gun or hose is leaking
to atmosphere
Check plunger either did not move or
did not seal
Actuator O-ring failure
Slow moving actuator; this may be
caused by bad O-rings either on the
plunger or inside the actuator fitting
Spring tension
Hose length
Water is leaking between ball
and seat
Cs on actuator plunger
are bad
Locknut may be improperly set
Tip/GPM combination is incorrect
Tip worn- the GPM may be greater than
expected with a worn tip
Bad gauge - the pressure may
be higher than the gauge shows
Landa EHW Operator's Manual 8.941-114.0 - M
SOLUTION
Will stop once at operating
temperature.
Check, repair or replace fittings.
Check and repair all leaks.
Remove discharge port. Clean and
inspect the check plunger.
Replace the O-ring if needed.
Remove actuator plunger assembly and
inspect O-ring and back-up rings. Replace
if necessary.
Remove the actuator assembly to inspect
the O-ring and back-up rings. The actuator
assembly will have to be disassembled to
inspect and/or replace the O-rings in the
actuator fitting.
Adjustment should stop when pressure is
no longer affected by further
compression of the spring.
Hose length can affect the amount of
spike pressure. Long lengths of hose may
cause high spike pressures.
Disassemble inlet fitting and check
for contaminates or worn parts.
Clean or replace as needed.
Remove actuator assembly and
inspect O-ring and back-up rings.
Replace if necessary.
Readjust locknut.
NOTE: The locknut is inside the spring on
models that have the stem exposed above
the spring.
Check actual GPM on unrestricted pump
and size tip accordingly.
Replace tip.
Replace gauge.