Merco Insta-Therm 16000 Series, Руководство по запчастям и обслуживанию

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Insta-Therm Service Manual 6
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming Power Supply Check breakers, reset if required. Check power plug
to be sure it’s firmly in receptacle.
Measure incoming power 208v
Hi Limit Thermostat Terminals are normally closed, if open push in reset
button.
If button will not reset replace hi limit.
Hi limit opens at 60C
Unit will not turn on
On – Off Switch Check continuity between switch terminals.
Replace switch as needed.
Contactor Check for supply voltage to contactor contacts, if no
voltage present trace back to on-off switch.
If voltage is present, check to insure contacts are
closing, replace as needed.
Solid State Relay
(Current limiting) Check for supply voltage to relay contact, if no voltage
present trace back to contactor.
Check for output voltage, if no output voltage check
percentage dial on relay is set to 50%.
If no output voltage present replace as needed.
No Stand By Heat
Elements Check the amp draw on each element for proper load.
Check specification plate for rating information.
Check individual elements for opens, shorts and
proper resistance 56ohms.
Micro Switch Check continuity of the NC held open switch with
sufficient weight on surface, if no continuity, replace
switch.
Solid State Relay
(Current limiting) Check for supply voltage to relay coil (this will be
indicated by two lamps on the unit) if no voltage
present trace back to contactor and/or the micro
switch.
Check for output voltage, if no output voltage check
percentage dial on relay is set to 50%.
If voltage is present at coil check contacts are closing,
replace as needed.
No Full Power
Elements Check the amp draw on each power leg for proper
load. Check specification plate for rating information.
Check individual elements for opens, shorts and
proper resistance 56ohms.
Hi Limit Trips Cooling Fan Motor Check to see cooling fan is operational, if not check
for voltage to motor, if no voltage present trace back
to on – off switch, if voltage is present replace motor.