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5. Field-wiring connections for modulation control are
to be made to external side of terminals 26, 28, 30
and 32 on humidifier’s control terminal strip.
Always refer to the external control’s wiring
diagram factory supplied with each NORTEC
modulation control option.
6. Varying dc Voltage Modulation Signal Powered
by Others: NHMC/NHP Series humidifier can be
factory configured to accept the following vdc
signals: 0-3 vdc, 0-10 vdc, 0-16 vdc, 0-20 vdc, 1-5
vdc or 2-10 vdc. Wire according to NORTEC
supplied external wiring diagram that comes with
each modulation option. To share the signal with
more than one humidifier, wire in parallel to each
humidifier. If a different signal is desired consult
factory.
7. Varying dc milliAmp (mA) Modulation Signal
Powered by Others: NHMC/NHP Series
humidifier can be factory-configured to accept a
standard dc mA signal, if pre-specified. Wire
according to NORTEC supplied external wiring
diagram that comes with each modulation option.
Choose from 0-20 dc mA or 4-20 dc mA. To share
the signal with more than one humidifier consult
factory.
8.
Varying Resistance (W) Modulation by Others:
NHMC/NHP Series humidifiers can be factory
configured to power a 3-wire varying resistance
modulation humidistat by others, if pre-specified.
Wire according to NORTEC supplied external
wiring diagram that comes with each modulation
option. Choose from 0-135W, 0-500W or up to
0-1000W. To share the signal with more than one
humidifier consult factory.
OPTIONAL MODULATION (CONTINUOUS
CONTROL) PACKAGES BY NORTEC
1. Modulation (continuous control) “packages” are
offered as accessories by NORTEC. Power
supply comes from inside NHMC/NHP Series
humidifiers.
2. NORTEC provides the humidity set point circuitry
and sensor(s) for wall or duct mounting or both
(only applies to NHMC. NHP is only capable of
single channel continuous control modulating) as
pre-selected when ordering the option. NORTEC
offers several packages for NHMC/NHP Series
humidifiers. Wire according to NORTEC supplied
external wiring that comes with each optional
modulation package.
3. Optional modulation packages without modulating
safety high limit can use on-off safety high limit.
Refer to on-off controls section.
4. All versions can use on-off safety air proving
switch. Refer to on-off controls section.
OPERATION
INTRODUCTION
The NORTEC NH Series humidifier is a
completely new design based on up-to-date
technology. The NHB is designed to provide clean
steam humidification at an economical price. It utilizes
NORTEC’s patented electronic Auto-Adaptive internal
control system for high efficiency, low waste of water
and electricity.
The NHP and NHMC utilize NORTEC’s patented
P+I Auto-Adaptive control for greater control of the
space humidity. Both the NHP and NHMC use a
micro-computer control system for greater flexibility.
The NHMC has a liquid crystal display (LCD) to
indicate system messages, display RH and
temperature. The NHMC can accept dual modulation
signals and is NORTEC’s most advanced model.
LAYOUT AND FUNCTION
The NH Series humidifiers consist of a plumbing
and an electric compartment. In every case there is at
least one steam distributor (SD) for installation in air
ducts or blower packs (built on: BOBP, remote
mounted: RMBP) for direct space humidification.
Water enters the steam cylinder through the
bottom via the drain valve from the fill cup assembly
when the 24 volt fill valve solenoid is energized. When
water submerges the electrodes, the minerals in the
water conduct current that heats the water and
produces sterile steam for distribution into the air. The
minerals in the water remain in the cylinder which is
periodically drained to maintain optimum performance
and cylinder life.
Primary electric power is applied to the electrodes
in the steam cylinder when the on/off switch is pushed
on and all controls options are calling. A primary to 24
volt stepdown transformer provides power to the
contactor holding coil(s) via the main control board.
The humidifier’s operating status is reported to the
user by the green and yellow indicator lights on the
front of the unit as shown in following table.
-7-
A
B
C
810 32 30 28 26
VariesWithEach
ModulationOption
SeeNORTECSupplied
ExternalWiringDiagram
External
Internal
NHMC/NHP
y
+
z
_
Figure #11
Generalized Modulation Wiring