Pentair 75 Operation And Installation Manual page 8

Operation - Heater (contd.)
Failure to Light- Lockout
1. Should the main burner fail to light, or flame is not
detected during the trial-for-ignition (TFI) period
the control will go into lockout and the valve will
be turned off immediately.
2. Recovery from lockout requires a manual reset by
resetting the thermostat or turning off the ON/OFF
switch for a minimum period of 5 seconds.
IMPORTANT!
IT IS RECOMMENDED THAT NO MORE THAN
TWO IGNITION ATTEMPTS IN SUCCESSION
BE PERFORMED FOR NATURAL GAS
SYSTEMS . BEFORE FURTHER IGNITION
ATTEMPTS WAIT AT LEAST FIVE MINUTES
FOR GAS TO CLEAR.
FOR PROPANE (LPG) SYSTEMS ALLOW AT
LEAST FIVE (5) MINUTES BETWEEN IGNITION
ATTEMPTS FOR THIS HEAVIER-THAN-AIR
GAS TO SAFELY DISSIPATE. AFTER TWO
UNSUCCESSFUL IGNITION ATTEMPTS WITH
PROPANE OPEN THE BURNER ACCESS
DOOR AND WAIT AT LEAST THIRTY (30)
MINUTES BEFORE REPLACING DOOR TO
ATTEMPT FURTHER IGNITION ATTEMPTS.
Normally the heater will light in the first or
second attempt. And with the exception of
a new installation or one that has been
shut down for an extended period, where
there is considerable air trapped in the gas
supply line, unsuccessful ignition
indicates other problems with the ignition
system - such as an unclean ignition
electrode impeding flame sensing.
3. If the thermostat is still calling for heat one hour
after a lockout the control will automatically reset
and attempt to ignite the burner again.
Flame Failure-Re-Ignition
1. If the established flame signal is lost while the
burner is operating, the control will respond within
0.8 seconds. The H.V. spark will be energized for a
trial for ignition period in an attempt to relight the
burner.
a. If the burner does not light the control will
de-energize the gas valve, shutting off the gas
flow, and the control will go into lockout as
described above in "Failure to Light-Lockout".
If flame is re-established, normal operation
resumes.
P/N 471105
NOTE
Control Fault -Diagnostic LED Conditions
Error Mode
Internal Control Failure
Flame Sense Fault
Ignition Lockout
The DSI Ignition Control can be accessed after removing
the heater's front control panel. The diagnostic LED
located on the top of the DSI control will flash on for 1/4
second, then off for 1/4 second during a fault condition.
The pause between fault codes is 3 seconds.
8
LED Indication
Steady on
2 flashes
3 flashes
Rev. F 1-22-04