Corrective Action - ECR International AT Serie Manuel D'installation, D'utilisation Et D'entretien

!
WARNING
Electrical shock hazard. Turn OFF electrical
power supply at main power switch before
servicing unit. Service shall be preformed by a
qualified service agent. Failure to do so could
result in death or serious injury.
Fault
HL - High Limit Trip
AbP - Abnormal Power
Alarm
Water temperature
overshoots set point
temperature.
DFF - Dry Failure
Alarm
tSO, tSS -
Temperature sensor
failure.
CHF
Control Hardware
Failure
Circuit Beakers Trip
r1, r2, r3, r4
Relay failure code
TROUBLESHOOTING
AT Boiler Trouble Shooting
Possible Cause
Is circulator pump functional?
Check temperature rise across boiler.
Check for temperature overshoot after
completion of heating cycle.
Check that HL screw terminals on control
board are tight.
Are high limit switches open while water
temperatures less than 200°F (<200°F)?
Is heat load too small?
Power too high or too low?
Power is OK while unit is off but drops
when unit is on.
A small overshoot is normal, however if
overshoot is greater than 10°F (OS > 10°F)
then check the following.
Boiler is oversized for heating zone?
Differential is too low?
Air in boiler?
Check resistance value of sensor using R/T
chart.
Check for all wiring for damage or loose
connections.
Inspect wiring for damage or short circuits.
Inspect heating elements, Check element
resistance value is between 9-20Ω (Ohms).
Is current draw between 12 A and 25 A per
element?
Is heating element wiring loose or
damaged?
Is heat relay stuck closed?
If pump is not working replace.
If > 20°F - Increase flow rate by using larger
pump or pipe size.
If greater than 10°F then increase differential
setting.
Check high limit switches with Ohm meter. Replace
high limit(s) open.
Check heat load calculations.
Check Incoming power is between 197 Vac
and 240 Vac. If power outside range, contact
electrician to have power corrected.
Check for adequate wiring and breaker size.
Check temperature rise across boiler is less than
20°F. If too high then increase flow rate through
boiler, use larger boiler pump if necessary.
Check heat load calculations.
Increase differential temperature setting.
Purge boiler until all air is removed.
Check that adequate air vents located in critical
system high points. Add vents as necessary.
Good - Check for loose WT terminals on control
board.
Bad - Replace Sensor.
Bad - Tighten any loose terminals. Replace
Damaged Wiring.
Good - Replace Control.
Bad-Tighten any loose terminals. Replace
damaged wiring.
Bad - Replace heating element(s).
Bad - Replace heating element(s).
Bad-Tighten any loose terminals. Replace
Damaged Wiring.
With power removed check relay contacts with
an Ohm meter. Replace control if relay is stuck
closed.
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Corrective action

PN 240013676 REV. A [07/01/2022]