Maritime Geothermal EMWT-65-HACW-P-1T, Инструкция по установке и обслуживанию

Страница: 30 / 44

Page 30 000662MAN-03 01 MAR 2012
ELECTRIC HEAT TROUBLE SHOOTING
Fault Possible Cause Verification Recommended Action
No Electric Heat Tripped or faulty electric
heat breaker. Reset if tripped. If not tripped verify
that there is 230VAC across L1 and
L3 of the electric heat contactor. Determine why breaker was
tripped. Replace breaker if faulty.
Insufficient Indoor Loop
pressure. Verify Indoor loop pressure. Must
have at least 12PSIG to engage the
safety pressure switch. Increase Indoor Loop pressure.
Faulty Timer.
(Note: timer is set to 2
hours at factory). Check timer setting. Adjust to mini-
mum value to test timer. Verify
24VAC across each of the terminals
to C on the terminals strip. Replace timer if faulty.
Faulty electric heat
contactor. Voltage on line side with contactor
held closed, but no voltage on one
or both terminals on the load side.
Points pitted or burned.
Or, 24VAC across coil but contactor
will not engage. Replace contactor.
Faulty elements. With power off to the unit, measure
the resistance across the T1 and T3
terminals of the electric heat contac-
tor .
Under 6 ohms = both elements good
Infinity = both elements bad. Replace the faulty elements.
Low Electric Heat
One faulty element. With power off to the unit, measure
the resistance across the T1 and T3
terminals of the electric heat contac-
tor .
6 to 12ohms = one element bad Measure each element individual-
ly to determine the faulty one and
replace it.
Faulty aquastat. S2 is not showing on the display
when it should be according to the
settings and tank temperature. Replace aquastat.
Faulty aquastat. S2 is showing on the display but
24VAC is not present across Stage
2 NO and COM in the aquastat. Replace aquastat.