Nortec 132-3091 manual Operation, Introduction, Layout And Function

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 (￿) 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 0-135￿, 0-500￿or up to

0-1000￿. 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.

Figure #11

Generalized Modulation Wiring

Varies With Each

Modulation Option

See NORTEC Supplied

AExternal Wiring Diagram

B

C

External
	8	10	32	30	28	26
Internal
			_	y	+	z	NHMC/NHP

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.

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