Start Up Procedure; Filling The System; Testing The Ignition Safety Shut-Off; Blower Pack Operation - Nortec GH Series Instaliation, User & Maintenance Manual

burner will then be lit and the igniter will stop glowing.
If the burner flame is not sensed by the flame sensor
within 4 seconds, the gas valve will shut off and this
cycle will be repeated a maximum of three times. To
recycle the burner, momentarily turn the power switch
to the off position and then to the on position. When
the humidity in the space matches the setting of the
operating controller, the system will shut down until the
next call for humidity.
START UP PROCEDURE
Prior to filling the unit, it is necessary to ensure
that no dirt or dust has accumulated in the control
compartment. If necessary, clean this area to prevent
contaminants from being drawn into the combustion
blower.
FILLING THE SYSTEM
Before the GH unit can be put into operation it
must be filled with water to the low level setting of the
water level controller.
To fill with water, turn the gas valve off and switch
the unit on at the power switch after all plumbing,
venting and wiring have been completed. The unit will
fill automatically until the low water level is reached
and then trial for ignition will begin. After three tries
the ignition module will lock-out. Leave the unit
switched on until the fill sequence is complete. Then
switch off the power and proceed with the ignition
safety shut-off test.
TESTING THE IGNITION SAFETY SHUT-OFF
The ignition system safety shut-off must be tested
by conducting the following method of test:
1. With the gas supply off, turn power on.
2. Blower prepurges for 30 seconds. NOTE: On
mUlti-blower models, it is necessary to wait for
all blowers to cycle.
3. After seven seconds the gas valve is
energized for four seconds, then de-energized.
After three trials for ignition (complete with
preperge) the unit goes into a safety lockout.
4. Manually re-open the gas supply. No gas
should flow to the main burner. End of test.
5. To reset the system, momentarily shut off
power switch, then turn it back on again.
Igniter will start to heat up and normal
operating cycle will occur as described in the
sequence of operation.
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BLOWER PACK OPERATION
Blower packs are equipped with a control
thermostat mounted on the steam distributor. As soon
as humidifier generates steam, the contact is closed
and the fan is started. When steam is no longer being
generated, the fan cuts out with a delay.
If blower packs get overheated (malfunction of the
air circulation), the resettable safety thermostat
interrupts steam generation. To reset, switch off the
humidifier and wait until the steam distributor cools
down. For manual reset, remove left-hand side intake
air filter and, using a screwdriver, press the reset
button (marked with a red dot) inside the blower packs.
All units are equipped with a speed select switch.
The switch is located on the right-hand side of the
blower, inside the blower pack. To access the switch,
remove right-hand side intake air filter.
To avoid condensation on the cabinet parts, run
blower pack on high speed when humidifier delivers
more than 75 Ibs/hr of steam per blower pack.
When two blower packs are connected to a GH
100 (100 Ibs/hr of steam) they may be operated on low
speed.
SAFETY INSTRUCTIONS
Refer to front cover and page 1 of this guide.
MAINTENANCE
DRAINING THE TANK
During extended periods of inactivity such as off
season or periods of very low demand, it is advisable
to drain the water from the tank. This is accomplished
by switching the power off and opening the 1" manual
drain valve at the bottom of the tank in the control
cabinet area. On models shipped with electric drain
valves, simply switch the unit to "Drain".
Ensure that valve is closed and power is switched
on again during periods of demand.
CLEANING THE STAINLESS STEEL TANK
CAUTION: Water and scale may be hot enough
to cause burns. Turn off humidifier and allow it to cool
before cleaning.
The combustion chamber walls are usually self
cleaning. The mineral buildup flakes off, due to the
expansion and contraction and violent boiling action