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·
At the completion of the float test, the humidifier
will begin the combustion sequence by energizing
the combustion blowers
·
All blowers will run at full output for 30 seconds to
pre-purge the combustion chamber. During this
time the controller will monitor that all air proving
switches closed to prove air flow
·
The igniter(s) will be energized for 15 seconds,
allowing it time to heat to the appropriate ignition
temperature and the gas valve will be energized
·
After 4 seconds both the gas valve(s) and the
igniter will be de-energized
·
After three trials for ignition (complete with
pre-purge) the red LED on the ignition control
module will begin blinking to indicate a safety
lockout and a fault message will be displayed on
the humidifier display
·
NOTE: On multiple burner models, each burner
tries to ignite in sequence. It is necessary to wait
for all burners to cycle to complete the test.
· Manually re-open the gas supply to the
humidifier. No gas should flow to the burner(s)
· To reset the humidifier, shut off the power switch,
then turn the power back on
STARTING THE HUMIDIFIER
Once the tank has been filled and the ignition
safety test has been performed as outlined above, the
humidifier is ready to be put into operation.
·
Verify that the inspection checklist has been
completed and all deficiencies with the
installation have been corrected
·
Open the shut-off valve in the gas supply line
·
Open the shut-off valve in the water supply line
·
Ensure all external controls connected to the
security loop are closed
·
Verify that the building demand signal is
connected to the humidifier
·
Install and secure all cabinet service doors
·
Switch the humidifier on
·
At the completion of the float test, the humidifier
will begin the combustion sequence and each
burner will ignite in sequence
·
Depending on the system demand the
combustion blowers will modulate faster or slower
to control the burner input
·
The water in the tank will heat up and begin to
boil, delivering steam to the distribution system
·
During the boiling sequence the water fill valve
will periodically activate to replenish water that
has evaporated from the tank
·
Once the humidity requirements have been
satisfied (demand drops below minimum %) all
gas valves will be de-energized and the blowers
will be shut off after performing a post purge of
the combustion chamber
·
The humidifier will go into standby mode until the
next call for humidity (demand rises above
minimum %) at which time the unit will again
begin the combustion sequence
TAKING OUT OF OPERATION
If it is required that the humidifier be taken out of
operation (e.g. for service or end of season
shut-down), proceed as follows:
· If the unit is firing, remove the demand signal or
open the security loop, allowing the burners to
shut off and the blowers to perform a post purge
of the heat exchangers before shutting off
·
Switch the main power switch from On to Off and
then to the Drain position. The drain pump will be
energized and the tank will begin to drain
·
Once the tank has completely emptied shut off
the drain switch
·
Close the shut-off valve in the gas supply line
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