Nortec MH Series, Engineering Manual

The Nortec MHTC / MHB |

 8

Description of Components 

Table 2: Humidifier Components 

Component 

Function of Component 

Check Valve 

Provides back flow protection for supply water line. 

Conductivity Sensor 

/Transmitter 

Sensor measures conductivity of water in the reservoir.  Transmitter 

sends measured value to control box for use in water quality control. 

Control Box / 

Display and Keypad 

Controls all functions of the humidifier’s operation and provides user 

interface for configuration of the humidifier. 

Drain Pan 

Collects unevaporated water from media for recirculation or draining. 

Drain Pan Drain 

Drain pan connection to hydraulic unit reservoir. 

Drain Outlet 

Drain connection from the hydraulic unit. 

Drain Overflow 

Provides protection from overfilling the drain pan. 

Drain Valve 

Drains water from the reservoir. 

Duct Seal 

Prevents duct air flow from bypassing the humidifier. 

Fill Valve 

Controls makeup water flow to humidifier based on float level.  

Float 

Measures water level in reservoir to prevent over filling. 

Fuse Block 

Overcurrent protection for pump and UV light. 

High Voltage 

Terminal Block 

Primary voltage connection on hydraulic unit and in control box. 

Hydraulic Unit 

Collects water from the drain pan and pumps, treats with UV light, and 

stages water to media.  Fills and drains reservoir to control water quality. 

Intermediate 

Member 

Structural member supports media boxes. 

Low Voltage 

Terminal Block 

Hydraulic Unit – connects control box inputs to the hydraulic unit. 

Control Box – provides connection for control signals and safety loop. 

Media Boxes 

Surface from which water is evaporated for humidification/cooling. 

Available in 8 in. (20 cm) or 12 in. (30 cm) thickness. 

Mist Eliminator 

Captures any water droplets that are carried off the media boxes with air 

flow in high duct speed applications. 

On/Off Switch 

Turns power On/Off to humidifier controller.  Note: Turn off humidifier 

disconnect to shut off primary power to the humidifier. 

Pressure 

Equalization Line 

Balances pressure in hydraulic unit reservoir with pressure in duct to 

ensure proper water flow to reservoir from drain pan. 

Pump 

Pumps water from the reservoir to the media boxes. 

Pump and UV Light 

Relay 

Turns on power to the UV light and pump based on signal from the 

control box. 

Reservoir 

Collects water from the drain pan for recirculation / draining. 

Side Panel, Right 

Structural member supports media boxes and spray bar cap. 

Spray Bar Cap/ 

Spray Bars 

Distributes water to the media boxes and prevents water from spraying 

anywhere else. 

Staging Manifold / 

Valve(s) 

Controls flow of water to media boxes based on demand. 

Transformer 

Steps primary voltage down to 24 VAC for the controller and internal 

components such as the fill valve and drain valve. 

UV Light 

Eliminates any bacteria in the water being pumped to the media boxes. 

Water Lines 

Supply water lines from hydraulic unit to spray bars.