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has been improved to prevent backup despite long
or gently sloped drain lines but it can not
compensate for flat or uphill runs.
2. The drain line should not end in a sink used
frequently by personnel, or where plumbing codes
prohibit it. Route to a floor drain or equivalent for
safety reasons, since drain water from humidifier
can be very hot.
3. Keep drain lines as short as possible. Keep drain
lines sloped down, not level and not up since
low spots in drain lines will accumulate
sediment and cause backup. The drain line
should be 7/8" O.D. copper pipe or larger. Do not
use plastic pipe for drain lines. Consult factory.
STEAM LINE AND CONDENSATE RETURN LINE
1. Refer to the installation manual of the steam
distribution system used in your application.
Steam Distribution - Form #XX-231, SAM-e - Form
#XX-249, Blower Pack - Form #XX-239.
ACCESSORIES - FILL CUP EXTENSION KIT(S)
1. The NH Series humidifier is an electrode
humidifier. It produces steam at atmospheric
pressure. Pressure head must develop to push
steam through supply line and into air duct.
2. Combined resistance of duct positive static
pressure and steam line resistance creates a
small pressure head in steam cylinder. Total
amount of positive static pressure head is
reflected directly by water column differential that
develops between water in the fill cup hose
feeding cylinder and water level in cylinder.
3. Standard dimensions of humidifier limit static that
can be tolerated before water will be pushed high
enough to spill over into overflow tube in fill cup
assembly.
4. To increase allowable water column (allowable
positive static pressure) an accessory Fill Cup
Extension Kit is available from NORTEC. See
Figure #8.
5. Water column requirements are even higher duct
static pressure when distributor’s steam outlets
are faced with downflow duct applications.
ELECTRICAL
PRIMARY VOLTAGE SUPPLY WIRING TO
HUMIDIFIER
1. Check and ensure that available voltage and
phase corresponds with operating voltage and
phase of humidifier as indicated on the humidifier
nameplate label (see Figure #1).
2. Ensure that an adequate power supply is available
to carry full humidifier amperage drawn as
specified by rated amps on the humidifier
nameplate label refer to local codes.
3. A dedicated external disconnect must be installed.
Do not exceed the maximum circuit protection
amps as indicated on the nameplate label.
4. Optional internal primary fuses are not intended to
substitute for external fuses. Internal primary
fuses are a factory added option (when specified)
to protect internal primary wires individually.
5. Connect ground wire to cabinet ground clamp. Do
not use neutral wire of four wire supply as ground.
6. Single phase humidifiers may be run on three
phase power, but load may unbalance power grid.
7. External wiring sizes must be in accordance with
NEC and/or CEC and existing local electrical
codes and by-laws.
-4-
ClampAnd
1.5”I.D.Hose
FactorySupplied
2" O.D. StainlessSteel Pipe
Or2" I.D.DICompatible Hos
e
(NotSupplied)
Stainlesssteel Reducer To
ServeAsFunnel
Drain(ByOthers)
A
ir Gap
NOTE: Steam hose should not reach bottom of the funnel.
Figure #7
Drain Connection
HoseFromFillValve
Fill Cup Bracket
Fill Cup
Overflow Hose
Fill Hose To
Cylinder
Figure #8
Fill Cup Extension Kit to Overcome Static Pressure