Service manual

Electric Booster– Installation, Operating and Maintenance Instructions
11
Problem Possible Cause Solution
Thermostat set too high
above 185ºF (85ºC)
Remove front cover. Adjust thermostat
to a lower setting.
Pressure increases to 125
p.s.i. during booster heater
heating cycle because:
A. Pressure reducing
valve is an incorrect
style (without relief by-
pass). Letter “B”
should be in model
number.
Replace with correct pressure reducing
valve.
Pressure temperature relief
valve discharges water
B. By-pass in pressure
reducing valve plugged
or inoperative.
While unit in heating cycle, tap
pressure-reducing valve with wood
hammer or screwdriver handle. If
pressure gauge does not show drop in
pressure, replace pressure-reducing
valve.
Pressure temperature relief
valve discharges water (after
checking above).
Relief valve not reseating
properly.
Quickly lift and release manual
discharge lever on relief valve to assist
proper reseating. If this fails, replace
temperature and pressure relief valve.
Element and thermostat
threads may be leaking.
Turn off electricity to booster heater and
tighten elements.
Turn off water, drain, remove and apply
sealant if necessary. (Be sure to turn
off electricity before draining or
elements will burn out).
Water leaking from booster
heater.
Plumbing connections may
be leaking.
Tighten incoming pipes, heating
elements, and temperature and
pressure relief valve. Turn off water,
drain and remove and apply sealant if
necessary. (Be sure to turn off
electricity before draining or elements
will burn out).