Lochinvar EnergyRite ER202 Installation & Operation Manual page 43

10
Operating information
Sequence of operation
OPERATION
1. Upon a call for heat, the control module will look at the
high limit, the water pressure switch, and the auxiliary
safeties. If any of these devices are open, the control
module will not initiate an ignition sequence.
2. The control will enter the Pre-Purge Mode. After a few
seconds it will begin to look for the air pressure switch
to be closed. It will also look to see that the proving
switch is closed.
3. Once both the air pressure switch and the proving
switch are sensed closed the blower will provide an
additional pre-purge period before initiating a trial
for ignition.
4. Once the prepurge period is complete, the control
module starts the trial for ignition by sending spark
voltage to the spark electrode and opening the gas
valve.
5. If the control module does not detect flame by the
end of the trial for ignition period, the control module
will close the gas valve and initiate a prepurge
period. After the prepurge period another trial for
ignition sequence will begin. If the control module
does not detect flame by the end of the 4th trial for
ignition period, the control module will lockout and
display ignition failure in the display.
6. If the control module detects a flame before the trial
for ignition period ends, the spark shall be
de-energized and the gas valve will remain open.
7. Once the call for heat has been satisfied, the control
module will de-energize the gas valve. The blower will
continue to run for the post purge period.
8. The unit waits for the next call for heat.
Installation & Operation Manual
(continued)
POOL: Standby
POOL TEMP: 78°F
POOL: Standby
POOL TEMP: 78°F
POOL MODE PREPURGE
POOL MODE IGNITION
POOL MODE PREPURGE, IGNITION,
LOCKOUT IGNITION FAILURE
POOL: Heating
POOL TEMP: 78°F
POST PURGE POOL MODE
POOL: Standby
POOL TEMP: 78°F
DISPLAY
43