WHL-038 Rev. 1.29.16
63
Part 13 - Shutdown
A. Shutdown Procedure
If the burner is not operating, disconnect the electrical supply.
If the burner is operating, lower the set point value to 70
o
F
and wait for the burner to shut off. Continue to wait for the
combustion blower to stop, so all latent combustion gases are
purged from the system. This should take a maximum of 40 to
90 seconds.
B. Vacation Procedure
If there is danger of freezing, change the set point to 70
o
F. DO
NOT turn off electrical power. If there is no danger of freezing,
follow “Shutdown Procedure”.
C. Failure to Operate
Should the burner fail to light, the control will perform two
more ignition trials prior to entering a lockout state. Note that
each subsequent ignition trial will not occur immediately. After
a failed ignition trial, the blower must run for approximately
10 seconds to purge the system. Therefore, a time period of
approximately 40 to 90 seconds will expire between each
ignition trial.
If the burner lights during any one of these three ignition
trails, normal operation will resume. If the burner lights, but
goes off in about 4 seconds, check the polarity of the wiring.
See electrical connection section.
If the burner does not light after the third ignition trial, the
control will enter a lockout state. This lockout state indicates
that a problem exists with the boiler, the controls, or the
gas supply. Under such circumstances, a qualified service
technician should be contacted immediately to properly
service the boiler and correct the problem. If a technician is
not available, depressing and holding the
RESET
button for
more than 1 second will remove the lockout state so additional
trials for ignition can be performed. The unit will try to re-light
once every 6 minutes.