Lochinvar F0600187510 - Manual (Page 42)

Commercial Pool Heaters
HOT SURFACE IGNITION SYSTEM
Hot Surface Igniter and Ignition Control
Module
This unit has one ignition module and one hot surface igniter.
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CAUTION: The igniter is extremely fragile, be
very careful when removing. A faulty or damaged hot
surface igniter MUST BE replaced with a Lochinvar
PLT3400 igniter. DO NOT use general purpose field
replacement igniters.
Figure 47 – Hot Surface Igniter
Figure 48 – Hot Surface Ignition Control Module
Hot Surface Ignition Control Module
Ignition Module Lockout Functions
The ignition module may lockout in either a hard-lockout
condition, requiring pushing of the reset button to recycle the
control, or a soft-lockout condition which may recycle after an
approximate five-minute waiting period. This soft-lockout
condition is intended to allow self-correcting faults to correct
themselves and permit normal operation. A typical hard-lockout
fault is a flame failure condition. An ignition module that is in a
hard-lockout condition may only be reset by pushing the reset
button for the ignition control. The reset button is located on the
front of the control panel. Upon a flame failure, the reset button is
only active after the control module has completed its post-purge
cycle. Turning main power “OFF” and then “ON” or cycling the
thermostat will not reset a hard-lockout condition. Wait five
seconds after turning on the main power before pushing the reset
button when the ignition module is in a hard lockout.
The ignition module will go into a soft lockout in conditions of low
air, low voltage or low hot surface igniter current. A soft-lockout
condition will operate the combustion air fans for the post purge
cycle and then the ignition module will pause for approximately five
minutes. At the end of this timed pause, the ignition module will
attempt a new trial for ignition sequence. If the soft-lockout fault
condition has subsided or has been corrected at the end of the timed
pause, main burner ignition should be achieved with the
resumption of the normal trial for ignition sequence. If the control
sensed fault is not corrected, the ignition module will continue in
the soft-lockout condition. If the thermostat opens during the
soft-lockout period, the ignition module will exit soft lockout and
wait for a new call for heat from the thermostat. A soft-lockout
condition may also be reset by manually cycling the thermostat or
turning the main power switch “OFF” and then “ON” after the
control sensed fault has been corrected.
Diagnostic Status Indication
The ignition module has an LED which indicates the status of the
safety circuits. A remote Ignition Module Status indicating light is
wired from the ignition module Status LED and mounted on the
front control panel. The flashing operation of this light/LED
indicates the diagnostic status of the ignition control module. The
status LED, mounted on the ignition module, flashes a code
sequence from the Ignition Module to indicate the status of the
ignition process. See TABLE– N, on page 43 for the flashing
diagnostic status codes as signaled by the ignition module.
42
OPERATION Continued