Nortec MH Series, Engineering Manual

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| Specifying the MH Humidifier / Air Cooler 

n)   Terminal block installed for easy field connection of low voltage 24Vac control 

cable from prewired hydraulic unit with 30 feet (10M) of cabling included. 

6.   The control panel (MHTC models only) shall be capable of accepting the following 

humidity control methods: 
a)   Humidistat/thermostat or BMS control 
b)   0-10Vdc, 0-5Vdc, 1-5Vdc, 2-10Vdc, 0-16Vdc, 0-20mA, or 4-20mA control signal 
c)   On/Off 24 Vac safety loop for On/Off control, air proving or high limit 
d)   Accepts Nortec Humidity Sensors or Controllers or Controls by others via DDC or 

BMS. 

e)   Integral timer programmable On/Off 

E.   Hydraulic Assembly (REflow model only) 

1.   For REflow models only a packaged pump hydraulic assembly will be included for 

recirculating water. 

2.   Air cooled electric sealed motor pump shall be powered by a 120 V 1phase 60 Hz 

connection. 

3.   Pump shall have stainless steel shaft and plastic housing to minimize corrosion 

and provide long service life. Pump shall be capable of running dry for short periods 
without damage. 

4.   Manifold block shall be configured to accept staging valves 1, 2, or 3 stages up to 

five banks of evaporative media. MHTC models only. 

5.   Adjustable volume control valves to provide even flow is always present to all 

media. 

6.   24 Vac pressure regulated water inlet valve with a ¾” BSPP connection shall 

operated between 30-80 psi operating pressure. 

7.   Level control float for indication to control electronics when water tank is full and 

when tank needs to be refilled. then 

8.   Drain connection is a 1.25” (3.175 cm) ID. 
9.   Overflow protection in case of a level control or fill valve failure allows water to flow 

directly to drain. 

F.   Aerosol Breakdown and Hygiene Control 

1.   The Management System must be cable of real-time flushing, washing and drying 

cycles to be programmable via the control panel of the Management System. In the 
event of no call for humidity, the humidifier shall drain the tank and remain empty 
until a demand is present. 

2.   A multi-sided gradient in the base pan ensures complete water tank draining and 

drying. 

3.   The humidifier shall provide aerosol-free operation and is guaranteed by the 

hygroscopic properties of the humidifier media. 

4.   Optional UV lamp that continually sterilizes all water flowing to evaporative media 

with UV-C radiation. 

5.   Optional conductivity monitoring sensor ensures water quality is maintained at an 

optimal level and maximum life of the media is achieved. 

G.  Available Options and Accessories 

1.   UV water treatment 
2.   Conductivity monitoring sensor (REflow models only) 
3.   Pressure reduction valve (building side) consult factory 
4.   P/N 1329505 - In-Line Water filter c/w 5 micron filter 
Nortec On/Off Controls: 
5.   P/N 2520273 - On/Off Dig. Duct Humidistat pkg 
6.   P/N 2520259 - On/Off Digital Wall Humidistat