Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual download pdf (Page 42)

Commercial Pool Heaters

OPERATION

Continued

HOT SURFACE IGNITION SYSTEM

Hot Surface Igniter and Ignition Control

Module

This unit has one ignition module and one hot surface igniter.

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.

 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.

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