Nortec MH Series - Manual (Page 9)

Introduction | 6
Options and Accessories
Nortec provides a complete line of options and accessories for every humidification application.
The following options and accessories are available and may have been delivered with your
MHTC humidifier/cooler. Refer to the installation instructions that came with the accessories
for their proper installation and operation.
Table 2: Options and Accessories
Option / Accessory Used For
Mist Eliminator Removing water droplets that have been picked up by the air
stream as it flows through the evaporative media.
Conductivity Sensor Measuring water conductivity in the MHTC Reflow reservoir for
improved water management.
Water Filters Removing foreign particles from water supplied to the MH.
Water Pressure Regulators Reducing supply line water pressure supplied to the MHTC Flow
and MHB.
Digital or Analog Control Humidistats Controlling the output of the humidifier based on sensed RH (can
be mounted in the space being humidified or in the duct).
Digital RH Transducers Communicating RH in a space or duct to the humidifier
Digital or Analog High Limit Humidistats Preventing over humidification in a duct by shutting down or
throttling down the humidifier when duct RH gets high.
Air Proving Switches Insuring humidification only occurs when air is moving in a duct.
Nortec LINKS XPS (MHTC Only) Connecting the humidifier to a building management interface.
hardware allows control of the humidifier via BACnet, Lonworks,
Johnson N2, or Modbus.
MH Specifications
Table 3: MH Specifications
MHB Flow MHTC Flow MHTC Reflow
Voltage 120 vac / 60 hz 120 vac / 60 hz 120 vac / 60 hz
Control signals VDC 0-10 VDC 0-5, 1-5, 0-10,
2-10, 0-16, 3.2-16
mA 0-20, 4-20
VDC 0-5, 1-5, 0-10,
2-10, 0-16, 3.2-16
mA 0-20, 4-20
Max No. of Stages 3 3 3
Water supply 3/4 in. BPP, 1/2 in.
NPT adapter provided
1/2 in/ FPT 3/4 in. BPP, 1/2 in.
NPT adapter provided
Water drain 2 in. (50.8 mm) OD
tube
2 in. (50.8 mm) OD
tube
2 in (50.8 mm) ID
hose
Control accuracy Depends on air conditions, number of stages, and control setup
Allowable water supply pressure 30-80 psi (2-5.5 Bar)
Allowable water temperature 41-104ºf (5-40ºc)
Water quality Tap water, reverse osmosis, softened or fully demineralized water.
Note: Ultrapure DI water not recommended on MHB or Flow Systems.
Max. allowable velocity through media 1100 fpm (5.5 m/s) with mist eliminator.
Pressure drop Typically 0.44 IWC (250 Pa) @ 500 fpm (2.5 m/s) and 90% RH
Ambient conditions (control unit) 34 -104ºF (1- 40ºC) Max 75% RH
Max. allowable air temp. through media 120 ºF (48 ºC)
Fire classification of evaporative media UL 900 Class 1 USA, ULC-S111-07 Class 2 Canada