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NORTEC), may be used for short condensate
runs.
2.
Always incorporate a trap in routing of
condensate return line. Condensate that
accumulates in trap will prevent possibility of
steam escaping. Depth of trap must exceed
duct static pressure in inches of water column.
See Figure #23.
Figure #23
Depth Of Trap My"
Must Be 2" More Than
Duct Static Pressure
Condensate Trap
1' \
3.
Ensure the trap is
3'
minimum under the
V
steam distributor and has the trap as close to
the floor drain as possible.
4.
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.
5.
All condensate return runs must be well
sloped towards the humidifier to ensure
adequate flow.
OPERATION
WATER LEVEL CONTROL
Band P Models
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 through one
channel and is routed to the float chamber through a
second channel. The tank fill incorporates a 1"
(25mm) minimum air gap, to meet plumbing codes.
This fill is isolated from the main tank to enhance
humidifier operation.
- 15 -
On initial startup, the solenoid operated water fill
valve opens and fills the water tank. When the water
level reaches float "8", see Figure #24, 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 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 "A" initiates the fill and
overflow cycle again.
If the water level'ever falls below float "8" the
burners will shut down to prevent any damage to the
unit.
Figure #24
PULSED FILL TO A
-f,~-+-~--II:;.f+f
CONSTANT FILL TO
a
-;~It-+-~:::-~~r-t"~~,,
c~~~~~~~~~~~y
TANK
Me
Model
SLOWDOWN
VALVE
A three-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 through one
channel and is routed to the float chamber through a
second channel. The tank fill incorporates a 1"
(25mm) minimum air gap, to meet plumbing codes.
This fill is isolated from the main tank to enhance
humidifier operation.
On initial startup, the solenoid operated water fill
valve opens and fills the water tank. When the water
level reaches float "C", see Figure #25, a call for
humidity will initiate the firing sequence. The water fill
continues until float "8" is reached. While the water
level is between Float "A" and "8" the fill valve will be
pulsed for intervals proportional to the demand for
humidity. When the water level reaches Float "A" the
fill valve will be disabled. 60 seconds after the fill
valve is disabled the drain valve will be activated (for a
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