Control Installation; Operation; Water Level Control; Sequence Of Operation - Nortec GH Series Instaliation, User & Maintenance Manual

5. Provide a "U" trap in condensate line even
when distributor is located in return air
plenum. It stops a suction action from
impeding condensate flow with duct pressures
below atmosphere.
6. It is not necessary to return the condensate to
the humidifier; however, routing condensate to
drain wastes energy.
7. All condensate return runs must be well
sloped towards the humidifier to ensure
adequate flow.
CONTROL INSTALLATION
1. Mount any wall humidistat (control or high
limit) over standard electrical box at height
similar to typical thermostat. Any wall
humidistat should be in location representative
of overall space being humidified and not in
path of blower pack or air supply grille. Do not
mount on an outside wall where temperature
fluctuation can affect control response.
2. Mount duct humidistat in location
representative of overall air humidity, usually
return duct. Do not mount it directly in front of
steam distributor or in turbulent or mixing
zone. Mount it where air's humidity and
temperature are uniform and representative of
spaces being humidified.
3. Mount duct high limit humidistat downstream
of steam distributors far enough that, under
normal humidity and air flow conditions, steam
will have been fully absorbed (typically at least
10 feet). It must be located to sense high
humidity only when uniform and representative
air is over-humidified or approaching
saturation.
4. Mount duct air-proving switch so that it is able
to sense air flow or lack of it. Wire it to make
when air flow is sensed and break when air
flow fails.
5. Check operation of all on/off controls before
starting humidifier.
6. Calibration of controls (on/off or modulation) in
the field may be necessary due to shipping
and handling. Verify humidistat accuracy
before commissioning system.
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OPERATION
WATER LEVEL CONTROL
A two float switch probe located in a separate float
chamber maintains water level and controls the fill
cycles through a solenoid operated valve. Cold fill
water is routed into the water tank, which incorporates
a 1" minimum air gap, to meet plumbing codes.
Overflow To
Skimmer
Low
Water
Level
/
Tank
Figure #23
Minimum 1" Air Gap
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A
B
0.
Fill Cycle
Q
Blowdown
CD"
Evaporation
On initial startup, the solenoid operated water fill
valve opens and fills the water tank. When the water
level reaches float "8", see Figure #23, a call for
humidity will initiate the firing sequence. The water fill
continues until float "A" is reached. Float "A" will
initiate a variable time delay relay which maintains
water flow for a preset amount of time. During a
portion of this time the water level in the tank will
exceed the level of the blowdown/skimmer and water
will flow down the drain until the timed cycle is
complete.
During operation, the water level in the tank will
lower by evaporation until float "An initiates the fill and
overflow cycle again.
If the water level ever falls below float "8" the unit
will shut down to prevent any damage to the unit.
SEQUENCE OF OPERATION
Provided the necessary power, water, gas and
vent connections are completed, the unit is started by
the activation of the on/off switch located on the front
panel.
When the operating humidistat and safety controls
are closed, the ignition module will energize the igniter.
The hot surface igniter then heats up, and after about
seven seconds, the gas valve is energized. The