Calcana SR Series, Specifications, Installation, Operation Service And Spare Parts Manual

Page: 82 / 96

SR -SERIES
78
CHECK CONTROL BOARD
Open access door and view the diagnostic red LED, located on the grey direct spark ignition module.
FAULT CONDITIONS
Error Mode LED Indication
Internal Control Failure Steady On
Air Flow Fault
1
flash
Flame with No Call for Heat 2 flashes
Ignition Lock Out 3 flashes
The LED will flash on for ¼ second, then off for ¼ second during a fault condition. The pause between fault
codes is 3-seconds.
INTERNAL CONTROL FAULT
•
If power supply cycles are fluctuating beyond 50/60 cycles such as with an un-stabilized power
supply from a generator, unit will not operate. If the circuit board is faulty the unit will not operate.
AIRFLOW FAULT - LOCK OUT (COMBUSTION AIR FLOW PROBLEMS)
•
Combustion airflow is continually monitored during an ignition sequence by the airflow switch
(PSW). If during the initial call for heat the pressure switch contacts are in the closed position for 30-
seconds without an output to the Combustion Blower, an airflow fault will be declared and the
control will remain in this mode with the combustion blower off.
•
If the airflow switch remains open for more than 30-seconds after the combustion blower output
(L1 & IND) is energized, an airflow fault will be declared and the control will stay in this mode with
the combustion blower off.
•
If the airflow signal is lost while the burner is firing, the control will immediately de-energize the gas
valve and the combustion blower will remain on. If the call for heat remains, the control will wait for
proper airflow to return. If proper airflow air is not detected after 30-seconds an airflow fault signal
will be declared.
Proceed as follows to verify reason for airflow lockout:
1. Check air intake and exhaust for blockage. Remove any blockage.
2. Check combustion air blower for dirt. Clean and/or replace as necessary.
3. If there is no blockage, disconnect fresh air intake at burner head (if equipped). Retry for ignition. If
unit does ignite, check to verify that duct size to unit is of proper size and length and that there is
no blockage. Replace ducting as necessary to reduce amount of air restriction to unit.
4. If unit still does not ignite, disconnect exhaust vent at heater and retry for ignition. If unit does ignite,
check to verify that vent size to unit is of proper size and length and that there is no blockage. (Refer
to
“ VENTING ” on pages 55 to Error! Bookmark not defined. ). Replace venting as necessary to reduce
amount of restriction.
5. If after 2, 3 and 4 are performed and unit still does not operate, replace air switch.
6. Reconnect venting and ducting, verify operation of unit.