Nortec NH-EL User Manual

Important: Read and save these instructions. This guide to be left with equipment.

2570435 D | 25 JUN 2014

NH-EL

Series

Installation and
Operation Manual

Includes installation, operation
maintenance and troubleshooting
information for your NH-EL Electric
Steam humidifier

INSTALLATION DATE (MM/DD/YYYY)

MODEL #

SERIAL #

CYLINDER #

Thank you for choosing Nortec.

Proprietary Notice

This document and the information disclosed herein are proprietary data of Nortec Humidity Ltd. Neither this
document nor the information contained herein shall be reproduced, used, or disclosed to others without the
written authorization of Nortec Humidity Ltd., except to the extent required for installation or maintenance of
recipient’s equipment.

Liability Notice

Nortec does not accept any liability for installations of humidity equipment installed by unqualified personnel or
the use of parts/components/equipment that are not authorized or approved by Nortec.

Copyright Notice

Copyright 2014, Nortec Humidity Ltd. All rights reserved.

Contents

1 Introduction

2 Receiving and Unpacking

3 Humidifier Components

5 NH-EL Models

6 Options and Accessories

9 Installation

10 Typical Humidifier Installation

11 Location

13 Mounting with Keyholes

14 Plumbing

15 Steam Distributor

16 Steam Lines and Condensate

Returns

21 Electrical

48 Operation

49 LED Status Lights

51 How the Humidifier Works

54 NH-EL Humidifier Configuration

62 Maintenance and

Servicing

63 Required Maintenance

68 Extended Shutdown

69 NH-EL Maintenance Checklist

70 Troubleshooting

72 General Troubleshooting

75 NH-EL Warnings and Faults

81 NH-EL Wiring Diagram (Cylinder A)

82 NH-EL Wiring Diagram (Cylinder B)

22 External Controls

36 Options and Accessories

38 Start Up

39 Installation Check

40 NH-EL User Interface

41 Start Up Procedure

42 Information Screens

43 Nortec Digital Controls

46 NH-EL Pre-Start Up Checklist

47 NH-EL Start Up Checklist

83 Spare Parts
95 Warranty

CAUTION: Servicing

Humidity Ltd.

CAUTION: Electrical

CAUTION: Plumbing

 All plumbing work should be done according to local plumbing code.

CAUTION: Installation

proving switch in series for this function.

Introduction

 Disconnect main power before any servicing.

 The plumbing and electrical compartments contain high voltage components and

wiring. Access should be limited to authorized personnel only.

 During and following operation of the humidifier, the steam and components in

contact with the steam such as the cylinder, blower pack, steam lines, steam
distributors, and condensate lines can become hot and can burn if touched.

 Nortec Humidity Ltd. does not accept any liability for installations of humidity

equipment installed by unqualified personnel or the use of

parts/components/equipment that are not authorized or approved by Nortec

 All electrical work should be done according to local electrical code.

 Electrical connection to be performed by a licensed electrician.

 Plumbing to be performed by a licensed plumber.

 Drain water from humidifier can be very hot. Do not drain to public sink.

 Do not mount on hot surfaces.

 Do not mount in area where freezing can occur.

 Do not mount on vibrating surface.

 Do not mount on floor.

 The NH-EL produces steam at atmospheric pressure; no devices which could block

steam output should be connected to the steam outlet.

 Steam lines must be installed so that no restriction can produce back pressure in

the humidifier. Failure to follow installation instructions will result in improper
operation and could void warranty.

 Regardless of selecting On/Off or modulating control method, NORTEC humidifiers

must have a closed circuit across its On/Off security loop control terminal to
operate. NORTEC highly recommends the use of a high limit humidistat and an air

1 | Introduction

Receiving and Unpacking

1 Check packing slip to ensure ALL material has been delivered.
2 All material shortages are to be reported to NORTEC within 48 hours from receipt of goods.

NORTEC assumes no responsibility for any material shortages beyond this period.

3 Inspect shipping boxes for damage and note damages on shipping waybill accordingly.
4 After unpacking, inspect equipment for damage and if damage is found, notify the shipper

promptly.

5 All NORTEC products are shipped on a Free-On-Board (FOB) factory basis. Any and all

damage, breakage or loss claims are to be made directly to the shipping company.

Before Installation

1 Ensure that available voltage and phase corresponds with humidifier voltage and phase as

indicated on humidifier’s specification label.

2 Ensure that the dedicated external fuse disconnect is of sufficient size to handle the rated

amps as indicated on the specification label. Refer to local codes.

3 Report any discrepancy immediately to the site engineer.
4 Ensure sufficient clearances will be available as described in Location on page 11.
5 Ensure steam lines can be routed to distributor or blower pack as described in Steam Lines

and Condensate Return on page 16.

Figure 1: Specification Label Location

Introduction | 2

Steam Outlet

Condensate Return

Fill Cup

Drain Valve

Drain Canal

Fill Valve

Cylinder

Cylinder Strap

Cylinder Plug

High Water Sensor
Plug

Touch Screen Display

On/Off Switch

Auxiliary Drain Switch

Door Interlock Switch

Driver Board

Remote Relay Board

Contactor

High Voltage
Terminal Block

Transformer

Integrated Controller

Control Terminal
Strip

NOTE:

NH-EL 005-030
shown, component
location may vary
slightly for other
models.

TEST

Humidifier Components

3 | Introduction

Figure 2: NH-EL Humidifier Components

Component

Function of Component

Auxiliary Drain

Drains water from cylinder by activating drain valve. Note that initiating a
drain in this manner will not induce Drain Water Cooling.

Condensate Return

Provides a connection to return condensate to humidifier.

Contactor

Turns On/Off power to cylinder electrodes.

Control Terminal
Strip

Terminal strip for connecting external controls and blower pack to
humidifier.

Cylinder Plug

Power connectors to electrodes in cylinder.

Cylinder strap

Securely holds cylinder in place.

Cylinder

Holds electrodes in water. Current between electrodes generates heat used
to generate steam.

Touch Screen
Display

User interface for configuring the humidifier.

Door Interlock
Switch

Prevents contactor from engaging when door is removed (pull out to
override this safety feature while troubleshooting).

Drain Canal

Combines cylinder drain water and fill cup overflow into a single drain outlet.

Drain Valve

Drains water from cylinder.

Driver Board

Provides input and output connections to humidifier components.

Fill Cup

Provides an air gap for backflow prevention.

Fill Valve

Controls flow of water into humidifier.

High Voltage
Terminal Block

Primary power connection from remote disconnect to humidifier.

High Water sensor
Plug

Used to detect max water level in cylinder.

On/Off Switch

Turns power On/Off to humidifier controller. Note: Turn off humidifier
disconnect to shut off primary power to the humidifier.

Remote Relay
Board (option)

Provides a terminal strip to dry contacts which open/close to indicate the
humidifier is on, humidifying, needs service, or is in a fault condition.

Steam Outlet

Connect to steam line with steam hose.

Integrated
Controller

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

interface for configuration of the humidifier.

Transformer

Steps primary voltage down to 24 VAC for the controller and internal
components such as the fill valve and drain valve.

Description of Components

Table 1: Humidifier Components

Introduction | 4

NH-EL 005-030 NH-EL 050-100 NH-EL 150-200

Fill Connections Drain Connections

NH-EL Models

The NH-EL with its Integrated Controller and state-of-the-art features and options is the most
advanced electrode steam humidifier available. As well as controlling the operation of the
humidifier, the Integrated Controller can be connected directly to BACnet and to the Internet.
The NH-EL is available in capacities ranging from 5 lb/hr (2 kg/hr) to 200 lb/hr (90 kg/hr). NH­EL humidifiers are packaged in three different cabinets depending on capacity. Figure 3: NH-EL
Sizes shows the configuration and relative size of the three different cabinets. NH-EL models up
to 100 lb/hr (45 kg/hr) are also available with a built on blower pack. Table 3 provides
specifications for the NH-EL product line.

Figure 3: NH-EL Sizes

Double Unit (NH-EL 150-200)

NH-EL double units have two cylinders to provide increased capacity. The construction and
installation of double units is identical to units with a single cylinder with the following
exceptions:

 Double units have two driver boards (designated A and B). One driver board controls each

cylinder. (See Figure 3: NH-EL Sizes).

 Double units can operate both cylinders in series or parallel from a single set of control

signals or independently based on two sets of control signals (see Double Mode (NH-EL 150-
200 only) on page 56 for configuration instructions).

 Independent Operation - If configured for independent operation then 2 sets of control

wiring must be provided. Control wiring for each cylinder must be connected to the

cylinder’s corresponding driver board/terminal strip and each cylinder performs

independent of the other.

 Parallel Operation - If configured for parallel operation then only one set of control wiring is

required and the cylinders operate in parallel. The advantage is even wear on both cylinders.

 Series Operation – If configured for series operation, then only one set of control wiring is

required and the cylinders operate in series. Cylinder A’s output range is 0-50% and
Cylinder B’s output range is 50-100%. The advantage is the lower turndown ratio of one
cylinder.

 Double units have one primary power connection but have individual fill, drain, and steam

outlet connections for each cylinder.

5 | Introduction

Option / Accessory

Application

Steam Distributors

Adding steam into air ducts.

Remote Blower Pack

Adding steam into a space remote from the humidifier.

SAMe Steam Distribution Manifold

Adding steam into air ducts where short absorption is required.

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

Ensuring humidification only occurs when air is moving in a duct.

Fill Cup Extension

Increasing the steam back pressure capability of an NH-EL.

Drain Water Cooling (Extreme)

Cooling drain water to less than 120 °F (49°C).

Foam Detection Kits

Increasing the range of water quality in which an NH-EL can
operate.

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 NH-EL humidifier. Refer to the installation instructions that came with the accessories
for the proper installation and operation.

Table 2: Options and Accessories

Introduction | 6

Phase

Capacity

lb (kg)

Volts

NH-EL

Part No.

Amps

Max

Ext

Fuse

KW

Stand-

ard

Cylinder

Fill

gal (l)

per min

Net/Full

Weight

lb (kg)

1

5 (2.3)

110-120

2573379

15.6

20

1.9

202

0.13 (0.5)

45/55

(21/25)

10 (4.5)

208

2573380

18.3

25

3.8

202

0.13
(0.5)

220-240

2573382

15.9

20

3.8

202

277

2573383

13.7

20

3.8

202

440-480

2573385

7.9

15

3.8

204

550-600

2573386

6.3

15

3.8

204

20 (9)

208

2573388

36.6

45

7.6

321

0.13
(0.5)

45/65

(21/30)

220-240

2573389

31.7

40

7.6

321

277

2573390

27.5

35

7.6

321

440-480

2573392

15.9

20

7.6

309

550-600

2573393

12.7

20

7.6

309

3

20 (9)

208

2573394

21.1

30

7.6

303

0.13
(0.5)

220-240

2573395

18.3

25

7.6

303

440-480

2573397

9.2

15

7.6

311

550-600

2573398

7.3

15

7.6

311

30

(13.5)

208

2573399

31.7

40

11.4

421

0.3

(1.2)

45/80

(21/37)

220-240

2573400

27.5

35

11. 4

421

440-480

2573402

13.7

20

11.4

411

550-600

2573403

11.0

15

11.4

411

50

(22.5)

208

2573404

51.9

70

18.7

621

0.5

(2.0)

85/150

(39/68)

220-240

2573405

45.0

60

18.7

621

440-480

2573407

22.4

30

18.7

605

550-600

2573408

18.0

25

18.7

605

75 (34)

208

2573409

77.9

100

28.1

621

0.5

(2.0)

220-240

2573410

67.4

90

28.1

621

440-480

2573412

33.8

45

28.1

605

550-600

2573413

27.0

35

28.1

605

100 (45)

208

2573414

94.4

125

34.0

621

0.9

(3.3)

220-240

2573415

90.0

125

37.4

621

440-480

2573417

45.0

60

37.4

605

550-600

2573418

36.0

45

37.4

605

150 (68)

208

2573419

155.8

200

56.1

621

0.5**

(2.0**)

120/245

(55/112)

220-240

2573420

135.0

175

56.1

621

440-480

2573422

67.4

90

56.1

605

550-600

2573423

54.0

70

56.1

605

200 (90)

208

2573424

188.7

250

68.0

621

0.9**

(3.3**)

220-240

2573425

180.0

225

74.8

621

440-480

2573427

90.0

125

74.8

605

550-600

2573428

72.0

90

74.8

605

Table 3: NH-EL Specifications

** Note: Per cylinder basis.

7 | Introduction

Phase

Capacity

lb (kg)

Volts

NH-EL
Space

Part No.

Amps

Max

Ext

Fuse

KW

Stand-

ard

Cylinder

Fill

gal (l)

per min

Net/Full

Weight

lb (kg)

1

5 (2.3)

110-120

2573429

17.2

25

2.0

202

0.13 (0.5)

83/93

(38/42)

10 (4.5)

208

2573430

19

25

4.0

202

0.13
(0.5)

220-240

2573431

16.5

25

4.0

202

277

2573432

14.2

20

4.0

202

440-480

2573434

8.2

15

4.0

204

550-600

2573435

6.6

15

4.0

204

20 (9)

208

2573436

37.3

45

7.8

321

0.13
(0.5)

83/103

(38/47)

220-240

2573437

32.3

40

7.8

321

277

2573438

28

35

7.8

321

440-480

2573440

16.2

20

7.8

309

550-600

2573441

13

20

7.8

309

3

20 (9)

208

2573442

21.8

30

7.8

303

0.13
(0.5)

220-240

2573443

18.9

25

7.8

303

440-480

2573445

9.5

15

7.8

311

550-600

2573446

7.6

15

7.8

311

30

(13.5)

208

2573447

32.4

40

11.7

421

0.3

(1.2)

83/118

(38/54)

220-240

2573448

28.1

35

11.7

421

440-480

2573450

14

20

11.7

411

550-600

2573451

11.3

15

11.7

411

50

(22.5)

208

2573452

52.6

70

18.9

621

0.5

(2.0)

123/188

(56/85)

220-240

2573453

45.6

60

18.9

621

440-480

2573455

22.7

30

18.9

605

550-600

2573456

18.3

25

18.9

605

75 (34)

208

2573457

78.6

100

28.3

621

0.5

(2.0)

220-240

2573458

68

90

28.3

621

440-480

2573460

34.1

45

28.3

605

550-600

2573461

27.3

35

28.3

605

100 (45)

208

2573462

95.1

125

34.5

621

0.9

(3.3)

220-240

2573463

90.6

125

37.7

621

440-480

2573465

45.3

60

37.7

605

550-600

2573466

36.3

45

37.7

605

Table 4: NH-EL Space Specifications

Introduction | 8

Installation

10 Typical Humidifier Installation
11 Location
13 Mounting with Keyholes
14 Plumbing
15 Steam Distributor
16 Steam Lines and Condensate Return Instructions
21 Electrical
22 External Controls

22 Control Wiring

22 Control Location

24 On/Off Control Wiring

25 Keep Warm Wiring

26 Modulating Control Wiring

28 Transducer Control Wiring

29 Double Unit Control Wiring

33 Remote Fault Option Wiring
34 Multi Mode Wiring
35 Modbus Digital Control
36 Options and Accessories

37 Fill Cup Extension

37 Extreme Drain Water Cooling

37 Condensate Cooling (External)

37 Foam Protection

37 Internal Fusing

37 Remote Fault Indication

9 | Installation

Typical Humidifier Installation

6 in.

(15 cm)

min.

right

clearance

36 in. (90 cm)

min. front
clearance

24 in.

(60 cm)

min.

3 in. (7.5 cm) Screws

1- 24 VAC
2- Security Loop
3- Common
4- Channel 1
5- Channel 2
6- 5 VDC
7- Ground
8- Blower Pack
9- Blower Pack

On/Off

Controls

Modulation

Controls

E
X

T
E
R

N
A
L

N
H

­E
L

L1L2L3

Ground

Dedicated

Circuit

Breaker or

Disconnect

NH-EL

EXTERNAL

Cold potable water
150-1200 microsiemens
30-80 psig

Air Gap

½ in NPT

2 in.

(5 cm)

min.

1ft (30 cm)

1 ft (30 cm)

min.

1 – 24 VAC
2 – Security Loop
3 – Common
4 – Channel 1
5 – Channel 2
6 – 10 VDC
7 – Ground
8 – Blower Pack
9 – Blower Pack

0” (0 cm)

right

clearance

6” (15 cm)

recommended

Mounting
Pg 13

Steam

Distribution

Pg 15

Controls
Pg 22

Plumbing
Pg 14

Electrical
Pg 21

Figure 4: Typical Humidifier Installation

Installation | 10

6 in.

(15 cm)

Recommended

Side

Clearance

36 in. (91.5 cm)

Min. Front Clearance

24 in.(61 cm)

Min Height

Mount Humidifier

Level

5-95%

(See Table for

Blowerpack

clearances)

(See Table for

Blowerpack

clearances)

(See Table for

Blowerpack
clearances)

If Blowerpack is used,

mount so that the steam

outlet is at least

96 in. (244 cm)

above ground level.

Note: Do not mount on hot surfaces, where freezing can occur, vibrating surface, or
floor.

Location

 Mount on a suitable wall or vertical surface. Do not sit the unit on the floor to allow

clearances required for plumbing and electrical connections.

 Clearance dimensions shown are for reference only and are the minimum required for

maintenance of the humidifier. Consult local and national codes before final location and
installation. NORTEC does not accept responsibility for installation code violations.

 Install only in areas with ambient temperature 41-104 °F (5 – 40 °C) relative humidity 5 -

95% (non condensing).

 When possible install the humidifier below the steam distributor. Take care to provide proper

steam line routing and proper condensate traps.

 DO NOT locate the humidifier any further than absolutely necessary from the steam

distributor location. Net output will be reduced as a result of heat loss through the steam
line.

 When possible, mount the NH-EL humidifier at a height convenient for servicing.

11 | Installation

Figure 5: Mounting Location / Clearance

Humidifier

Capacity

lbs/hr (kg/hr)

Minimum

No. of

Blower

Packs

Min. Frontal

Clearance

Inches (cm)

Min. Overhead

Clearance

Inches (cm)

Min. Left side

Clearance

Inches (cm)

Min. Right side

Clearance

Inches (cm)

30 (13.6)

1

132 (336)

12(31)

12 (31)

12 (31)

100 (45.4)

1

Not

recommended

Not

recommended

Not

recommended

Not

recommended

Humidifier

Capacity

lbs/hr (kg/hr)

Minimum

No. of

Blower

Packs

Min. Frontal

Clearance

Inches (cm)

Min. Overhead

Clearance

Inches (cm)

Min. Left side

Clearance

Inches (cm)

Min. Right side

Clearance

Inches (cm)

30 (13.6)

1

120 (305)

12(31)

12 (31)

12 (31)

100 (45.4)

1

248 (630)

36 (91)

30 (76)

30 (76)

Table 5: Clearances for Blower Packs on Low Speed*

Table 6: Clearances for Blower Packs on High Speed*

*NOTES:
Nominal Conditions 72˚F (22.2˚C), 43% RH.
Low speed not recommended for 100 lbs/hr humidifier. Consult factory for recommendations.
Blower Pack should not be installed near cold surfaces or where dew point may be reached.
Higher humidity or lower room temperature may result in longer absorption distances.

Installation | 12

B

A

Install “L” brac ket

after hanging
humidifier

#12 x 3 in. (7.5 cm)
Wood Screws

Insert screws so that

1/4 in. (6 mm) exposed,

hang unit, tighten

screws.

Unit Size Screws Dim A in (cm). Dim B in. (Cm)

5-30 2 11.9 (30.2) -

50-100 2 16 (40.6) -

150-200 3 16 (40.6) 16 (40.6)

SPACESPACE

SPACESPACE

Mounting with Keyholes

1 The NH-EL Series humidifier is wall mounted using keyholes located on the back of the unit

cabinetry.

2 Use #12 x 3 in. (7.5 cm) screws mounted into 2x4 studs or better. Two screws are needed

for a single unit (NH-EL 010 to 100). Three screws are needed for a double unit (NH-EL 150
to 200).

3 Keyholes are spaced 16 in. (40.6 cm) apart center to center for large units and 11.9 in.

(27.2 cm) apart for small units. Insert screws into the studs until there is 1/4 in. of screw
exposed. Be sure the screws are level to each other.

4 Raise the unit and place the screws through the keyholes. Make sure the unit is level, then

tighten the screws to secure the unit in place.

5 Place “L” Shaped brackets on top of the unit, with holes inline with the studs. Using the

appropriate sized wood screw, fasten the “L” brackets to the studs, securing the unit from
any upward motion. See Figure 6: Mounting with Keyholes.

Note: Use screws longer than 3” (7.5 cm) if drywall or other spacer is present.

13 | Installation

Figure 6: Mounting with Keyholes

Min. 7/8 in. OD drain line.
Keep as short as possible.
Slope down to floor
drain or main drain.
Increase size if combining
multiple drains as in double unit.

1.2 in. (30 mm). OD
un-threaded outlet
with factory supplied
bent hose and clamp.

Air gap required.
2 1/2 in. to 7/8 in. copper
reducer is ideal.
(NORTEC option P/N 2522172)
Hose must not touch
the bottom of the funnel.

Always install a water
shut-off valve.

1/2 in. NPT

Use union to connect

supply pipe to unit.

*Pipe and water shut-off valve not supplied by NORTEC.

Note:

 Use material suitable for 212°F (100°C) for drain and condensate lines.

Plumbing

 Drain Water is very hot, do not drain to public sink

 Supply cold potable water (not Reverse Osmosis or Demineralized). Conductivity:

150–750 microsiemens and pressure: 30-80 PSIG.

 All water supply and drain line connections should be installed in accordance with local

plumbing codes.

 Supply water should at 30 to 80 PSIG and be between 150-750 microsiemens (Hardness

0-12 GPG). For 750-1200 microsiemens, please consult factory.

 Install water shut off valve and union before humidifier to facilitate servicing.
 The drain line should not end in a sink used frequently by personnel, or where plumbing

codes prohibit. Route to a floor drain or equivalent for safety reasons.

 Ensure drain line is adequately sized to provide free and easy draining and that an air gap is

installed as shown. A restricted drain can cause cylinder water to over concentrate,
resulting in poor operation or result in water backing up at the air gap.

Figure 7: Water Supply and Drain Connection

Installation | 14

12 in.

(30 cm)

min.

Calculated absorption

distance to any obstruction

or 8-10 ft (2.4 - 3 m)

if unknown

Mount distributor

to side of duct

2 x duct

height min.

2/3 Duct
height

Note:





Steam Distributor

 Steam generated by the NH-EL may be distributed directly into a space with a built on or

remote blower pack, or into an air handling system using either Nortec steam distributors or
Nortec’s SAMe steam distribution manifold.

 Whichever method is used, the steam distributor should be installed as close as possible to

the humidifier. Short steam distribution lines minimize condensate losses and the possibility
of generating back pressure in the steam distribution line.

 Figure 8: Distributor Location in Duct provides common guidelines for locating a steam

distributor in a duct.

Figure 8: Distributor Location in Duct

Install the NH-EL as close as possible to whatever steam distributor is used.

Refer to distributor, SAMe, or remote blower pack installation manuals for detailed installation
instructions.

15 | Installation

NH-EL

Maximum Steam

MED-L

Stainless

Possible Steam Losses

Model

Line Length

Copper

Steel

(based on 1” insulated copper pipe)

ft

(m)

Tube

Tube

lb/hr/ft

(kg/hr/m)

5

7

(2)

3/4

0.875 X 0.049W

0.06

(0.09)

10

12

(3.5)

20

17

(5)

30

22

(6.5)

50

43

(13)

1 1/2

1.75 X 0.065W

0.11

(0.16)

75/150**

47

(14)

100/200**

50

(15)

Oversized Steam Line (Use for longer steam runs)***

5

14

(4)

1

1.125 X 0.049W

0.06

(0.09)

10

24

(7)

20

34

(10)

30

44

(13)

50

86

(26)

2

2.0 X 0.065W

0.11

(0.16)

75/150**

94

(28)

100/200**

100

(30)

Nortec Steam Hose

5-30

10

(3)

Pt No 1328810 (7/8”)

0.1

(0.15)

50-200**

10

(3)

Pt No. 1328820 (1 3/4”)

0.15

(0.22)

Danger:

Steam Lines and Condensate Return Instructions

The following instructions must be followed for installation of steam lines for ASD, BSD, CSD,
SAM-e, and remote blower packs. Failure to use material recommended in

Table 7, exceeding maximum recommended length in Table 7, or failure to follow any other
steam line installation instructions will result in improper operation and could void the warranty.

The NH-EL is an atmospheric humidifier that will only operate properly when its steam
distribution system is installed so that it provides no significant backpressure.

Installing the NH-EL in such a way that backpressure can develop during operation
could result in serious injury or damage to property.

Table 7: Recommended Steam Line Material*, Maximum Length, Losses

Note: * The use of steam line other than copper, stainless steel tube or Nortec supplied steam line will void the warranty and may

adversely affect the operation of the humidifier.

** Use one steam line per cylinder for NH-EL 150-200 humidifiers. Do not combine lines except at distributor using a Nortec adapter

designed for that purpose and only if humidifiers operate in parallel.

*** These diameters require a reducer at humidifier and steam distributor connection.

Installation | 16

Ste

am

D

irectio

n

Ste

a

m Dir

ectio

n

S

t

e

a

m

D

i

r

e

c

t

i

o

n

2 in.
(5 cm)

1 ft (30 cm)

1ft (30 cm)

0.5 in.
(12 mm)

10 Degrees

2 Degrees

Use Appropriate Slope Insulate Pipe

1 in. (2.5 cm) pipe

insulation

Minimal Slope (up)

Minimal Slope (down)

Figure 9: Steam Line Slope and Insulation

Trap condensate

12 in. (30 cm)

min drop to

top of ‘P’ Trap

P Trap min

6 in. (15 cm)

or

duct static

pressure + 2 in

whichever is

greater

Tee is same size

as steam line

Use a full size tee, not a 90
degree elbow for vertical
to horizontal transitions.

‘P’ Traps Use:

- NORTEC 0.375 in condensate hose

- 1/4 in Med-L copper tubing, or

- 0.375 in stainless steel tubing

Condensate drains must be sloped down.

1 ft (30 cm)

0.25 in
(0.6 cm)

 Trap at all low points and recommended intervals using full size ‘T’ for traps.

 Condensate should not be routed to a sink used frequently by personnel. Route to a floor

 Route condensate to floor drain or equivalent in multi-unit to single SAM-e installation.

17 | Installation

drain or equivalent. Condensate normally cools in traps but is still hot. A SAMe or larger
steam line generates more condensate and water may not cool in the trap. A drain water
cooler option may be installed if required by code.

Figure 10: Condensate Traps

Hose cuff
with clamps

2 in. (5 cm)

min.

1 ft (30 cm)

‘P’ Trap

1 ft (30 cm)
min. before

any bend

Condensate line
Route to fill cup or drain .

Use steam hose and clamps
between cylinder and steam line.

Insulated copper
steam line. Support
so weight is not on
cylinder.

Never

1 ft (30 cm)

min.

< 1 ft
(30 cm)

Best

Never

< 1 ft
(30 cm)

Best

Good

Never

Never

1 ft (30 cm)

min 0.5 in.
(12 mm)

1 ft (30 cm)

min 2 in.

(5 cm)

Steam Line Rules

Figure 11: Typical Steam Line Installation

The following 10 points provide rules for installing steam lines connecting the NH-EL
humidifier to ASD, BSD, CSD, SAMe and remote blower packs. In addition to these rules
never use unapproved material for steam lines.

1. Allow minimum of 12 in. (30 cm) before first bend in steam line.

2. Slope the steam lines.

Installation | 18

> 10 ft (1.5 m)

Never

< 5 ft (1.5 m)

Note: 1) Always support hose. 2) Do not exceed 10 ft (3 m) hose length

Best

Best

Never

12 in.
(30 cm)
min. Radius

< 12 in.
(30 cm)
Radius

Never

< 12 in.
(30 cm)
Radius

Good

min. 12 in.

(30 cm)

Never

< 12 in.
(30 cm)

< 12 in.
(30 cm)

Good Never

Notes: 1. Units must operate in parallel.

2. Also for double units (cylinders must operate in parallel).

Condensate
Traps

Good

Never

3. Use steam hose only for short distances.

4. For steam hose maintain minimum 12 in. (30 cm) bend radius.

5. Install traps on condensate lines at least 12 in. (30 cm) below

connection.

6. Only combine steam lines at steam distributor with Nortec adapter.

7. Install condensate traps at low points and horizontal to vertical

transitions.

19 | Installation

Best

Good Never

Nortec
Condensate
Trap

Sloping Down

Increase =

Condensate

Blockage

max. 15 ft

(4.5 m)

max. 15 ft

(4.5 m)

Never

> 15 ft

(4.5 m)

max. 15 ft

(4.5 m)

max. 15 ft

(4.5 m)

Good

Never

> 15 ft

(4.5 m)

Never

Install a valve or other obstruction

Never Never

Reduce Steam Line Size Install Copper or SST without Insulation

Never Never

Never

Never Never

Never

Never

After Installation Always:

 Ensure all condensate lines / traps flow.

8. Increase diameter either on down slope or install condensate trap.

9. Install condensate traps if steam line > 15 ft (4.5 m).

10. In addition never:

 Purge steam lines to remove any contaminants and installation materials

Installation | 20

L1
L2

Ground

L1
L2

Ground .

L1
L2
L3

Neutral

Ground

L1
L2
L3

Neutral

Ground

L1
L2

Ground

L1
Neutral

Ground

L1
L2
L3

Neutral

Ground

L1
L2

L3

Ground

Three Phase NH-EL

Single Phase NH-EL

Single Phase Supply

Three Phase Supply

(Note: Load will be unbalanced)

Three Phase Supply

Dedicated

Circuit Breaker

or

Fused Disconect

Note:
1

2

3

4

Optional internal fuses are not

a substitute for external fuses.

Dedicated external fused
disconnect must be installed.
Fusing must not exceed max
circuit protection as indicated
on the specification label.

Ensure that adequate power is
available to carry full humidifier
amp draw as indicated on the
specification label.

All wiring to be in accordance
with national and local electrical
codes.

E
X
T

I

N

T

E
X
T

I
N
T

E
X
T

I
N
T

E
X
T

I
N
T

Three Phase Supply

(Note: Load will be unbalanced)

Electrical

Caution: Wiring to be performed by a licensed electrician.

21 | Installation

Figure 12: Primary Power Connection

1

2 3

10 ft min.

Humidity
Control

(return air
duct or
location
representative
of the room)

Duct High

Limit

4

Out

door

temp.

sensor.

Air

Proving

Switch

Humidity
Control

(return air
duct or
location
representative
of the room)

Caution: Failure to wire the humidifier in accordance with the wiring instructions
could cause permanent damage. Such errors will void the warranty.

External Controls

Control Wiring

The following information is relevant to all controls, factory supplied or otherwise. For wiring use
a minimum of 18 AWG and keep as short as possible. The NH-EL humidifier can be operated
with two modulating inputs. Signal types must be the same (both demand or both transducer).
The NH-EL can also be operated as On/Off. See NH-EL Humidifier Configuration on page 54 for
configuration.

Control Location

Figure 13: Control Location (Duct Humidification)

Duct Humidification

1 Air Proving Switch

 Locate so that it can sense air flow or lack of it.

2 Duct High Limit

 NH-EL can be modulating, On/Off, or a humidity sensor.
 Locate at least 10 feet from steam distributor or far enough that under normal conditions

steam is fully absorbed.

3 Humidity Control

 NH-EL can be Modulating, On/Off, or a Humidity Sensor.
 Can be located either in return air duct (preferred) or in room being humidified.
 Mount in area representative of room humidity (draft, doorways, sunlight, or overhang such

as a shelf can affect reading). Avoid placing near discharge diffuser of humidified air.

4 Outdoor Temperature Sensor
 Mount in area representing outdoor air temperature (makeup air duct, outside).

Installation | 22

1

Humidity
Control

(in location
representative
of the space)

1

Humidity
Control

(in location
representative
of the space)

1

Humidity
Control

(in location
representative
of the space)

Note: Regardless of selecting on/off or modulating control method, Nortec humidifiers must have a

closed circuit across its security loop control terminal to operate. Nortec highly recommends the use

of a high limit humidistat and an air proving switch in series for this function.

Space Humidification

Figure 14: Control Location (Space Humidification)

1 Humidity Control

 NH-EL can be modulating, On/Off, or a humidity transducer.
 Locate in room being humidified but not in discharge zone of blower pack(s).
 Mount on indoor wall in area representative of room humidity (draft, doorways, sunlight, or

overhang such as a shelf can affect reading).

2 High Limit Humidistat (not shown)
 Install a high limit On/Off humidistat in area representative of room humidity.

3 Outdoor Temperature Sensor (not shown)
 Mount outside in area representing air temperature.

23 | Installation

Figure 16: Digital On/Off Humidistat

Note: 1

2
3

4

Humidifier will run when circuit between
terminal 1 a n d 2 on h u midifier is closed.
T e rminal 1 is 24 VAC Hot, turn uni t o ff to
avoid shorting while wiring.
Digital Humidi stat requires 24 VAC power
from terminals 1 and 3 of humidifier.

2520273 - Digital On/Off Duct Humidistat
can also be used for duct high li mit. W ire
in series to 3 - Common and 4 - Digital Out
of the humidistat.

Humidifier Terminal Strip

Air Proving

Switch

Duct High

Limit

2548731 - Digital

On/Off Humidistat

1 – Common

8 – Temperature

On/Off Control Wiring

Figure 15: On/Off Controls

2 – 24 VAC

3 – Digital In

4 – Digital Out

5 – Fan Activation

6 – Fan Activation

7 – Temperature

Installation | 24

Air Proving

Switch

Duct High

Limit

Digital On/Off

Humidistat

Duct Sensor

1 - Common

2 - 24 VAC

3 - Analog Out

Wire remote sensor to digital display as shown below,

wire digital display to humidifier as shown above.

2520273 - Digital On/Off Duct Humidistat Package

1 - Ground

2 - 24 VAC

7 - Analog In

The security loop must
be closed for keep warm
to operate when the
humidifier is in standby.

Install an On/Off high
limit humidistat between
terminal 1 and 2.

Optional Modulating

Humidity Controller

Channel 2

Humidity Controller

Channel 1

Other On/Off
Controls

Figure 18: Keep Warm Wiring

1 – Common

7 – Analog In

Keep Warm Wiring

For the keep warm feature to work the security loop between terminal 1 and 2 on the low
voltage terminal strip must be closed. To accomplish this:

1 Install an On/Off high limit humidistat between terminal 1 and 2.
2 Install any other On/Off controls in series with the control signal connected to terminal 4

(Channel 1 control signal).

3 If desired a modulating high limit humidistat can also be installed and connected to terminal

5 (Channel 2 control signal).

2 – 24 VAC

Figure 17: Duct Sensor Wiring

25 | Installation

Note: 1

2

3

4

Install On/Off controls or jumper between
terminal 1 a n d 2 o f h u midifier in order to run.
Terminal 1 is 24 VAC Hot, turn unit off to
avoid shorting while wiring.

High Limit Humidistat must be duct mounted.
It can be On/Off or modulating.
Control Humidistat can be mounted in space
or in return air duct and can be On/Off or
modula ting.

Air Proving

Switch

High Limit Humidistat

Control Humidistat

Humidifier Terminal Strip

SPACE

SPACE

Figure 20: Digital Modulating Humidistats

1 – Common

2 – 24 VAC

1 – Common

2 – 24 VAC

Analog Out -3

24 VAC – 2

Common – 1

Modulating Control Wiring

Figure 19: Modulating Controls

Installation | 26

Air Proving

Switch

Duct High

Limit

2520261 - Digital
Wall W/O Sensor

1509858 - Wall

Sensor

1 - Common

2 - 24 VAC

7 - Analog In

1 - Common

2 - 24 VAC

6 - Analog Out

Wire wall sensor to digital display as shown

below, wire digital display to humidifier as shown

for 1510142 - Digital Wall Humidistat.

+

1509858 - Wall Sen so r

2520261 - Dig ital Wall W/O Sensor

2520261 - Digital
Wall W/O Sensor

1509858 - Wall

Sensor

Figure 22: Digital Wall Humidistat - On/Off High Limit Duct Humidistat

1 – Common

2 – 24 VAC

1 – Common

8 – Temperature

Figure 21: Digital Wall Humidistat – Remote Wall Sensor

2 – 24 VAC

3 – Common

4 – Digital Out

7 – Temperature

27 | Installation

Figure 24: Digital Transducers

Air Proving

Switch

Duct High Limit

1509857 - 2-10V Duct

Humidity Transducer

Humidity Control

1509858 - 2-10V Wall

Humidity Transducer

Note: 1

.

2

3

4

Install On/Off controls or jumper between
terminal 1 a n d 2 o f h u midifier
Terminal 1 is 24 VAC Hot, turn unit off to
avoid shorting while wi rin g .

Duct High limit can be duct humidity
transducer as shown or duct On/Off humidistat.
Humidity Control can be wall humidity
transducer as shown, duct humidity transducer,
or On/Off humidistat.

Humidifier Terminal Strip

1 – Common

3 – Analog Out

1 – Common

2 – 24 VAC

.

Transducer Control Wiring

Figure 23: Transducers

2 – 24 VAC

Installation | 28

Connect all controls
to terminal block A

B

A

Double Unit Control Wiring

NH-EL double units (150-200) have two low voltage terminal blocks. The units can be
configured to operate the cylinders in series or parallel from one set of control signals, or
independently from two sets of control signals. See Double Mode (NH-EL 150-200 only) on
page 56 for more information.

Always select Parallel operating mode when connecting both cylinders to one SAM-e. Use
separate steam distributors for each cylinder if configured for sequence operation.

Parallel or Series - One set of control signals (Double Mode = Series or Parallel) wire the

controls to terminal block A.

Figure 25: Parallel or Series Mode Control Wiring (Double Unit)

29 | Installation

Figure 26: Double Unit Parallel or Sequence Wiring

Double Unit Control Wiring (Continued)

Installation | 30

Figure 28: Double Unit Independent Mode Wiring

Zone B (Cylinder B) Controls Zone A (Cylinder A) Controls .

Connect zone B

controls to

terminal block B

Connect zone A

controls to

terminal block A

B

A

1 – 24 VAC
2 – On/Off Loop
3 – Common
4 – Channel 1
5 – Channel 2
6 – 10 VDC
7 – Ground
8 – Blower Pack
9 – Blower Pack

1 – 24 VAC
2 – On/Off Loop
3 – Common
4 – Channel 1
5 – Channel 2
6 – 10 VDC
7 – Ground
8 – Blower Pack
9 – Blower Pack

Double Unit Control Wiring (Continued)

Independent– Two sets of control signals (Double Mode = Independent) wire the controls for
Zone A (cylinder A) to terminal block A and wire the controls for Zone B (cylinder B) to terminal
block B. All control signals must be the same type (Demand/Transducer).

Figure 27: Independent Mode Control Wiring (Double Unit)

31 | Installation

Figure 30: Outdoor Temperature Sensor

SETPOINT LIMIT (%RH)

OUTDOOR TEMPERATURE

1 – 24 VAC
2 – On/Off Loop
3 – Common
4 – Channel 1
5 – Channel 2
6 – 10 VDC
7 – Ground
8 – Blower Pack
9 – Blower Pack

1 – Common

2 – 24 VAC

Outdoor Temperature Setback Sensor

Figure 29: Outdoor Temperature Reset

 Each digital controller is equipped with an integrated reset function that can reduce the

setpoint during cold weather operation. This will prevent condensation on windows and
building structures. The above graph illustrates how the setpoint reset feature operates.

 This feature is enabled by removing the jumper from terminals 8 and 1 on the humidistat

and wiring the outdoor temperature sensor to these terminals.

 When the outdoor temperature setback feature is in effect, the humidistat will normally

display the calculated setpoint limit based on the outdoor air temperature. A snowflake will
also be displayed to indicate cold weather operation. When any key on the controller is
pressed, the LCD screen will display the customer specified setpoint for a short duration.

Installation | 32

Steam

Unit ON

Error

Service

NO

COM

NO

COM

NC

NO

COM

NC

NO

COM

Remote Fault Option Wiring

The NH-EL remote fault option includes 4 relays that can provide remote status indication. The
relays are mounted to a remote fault board which is located as shown in Figure 31: Remote
Fault Wiring. The PCB with the relays includes markings which indicate the function of each
terminal on the board. The relays indicate the following status:

1 Unit On – The normally open relay is closed when the humidifier has power and the On/Off

switch is set to on.

2 Steam – The normally open relay is closed when the control board detects that the cylinder

is drawing current and steam is being produced.

3 Service – The relay can be wired to open (NC) or close (NO) when a warning is displayed on

the humidifier display and the yellow service LED is illuminated.

4 Error – The relay can be wired to open (NC) or close (NO) when a fault is detected by the

humidifier controls.

Figure 31: Remote Fault Wiring

33 | Installation

Daisy chain pole 1 and 2
of terminal J10 of the
control board.

Do not reverse polarity.

Note:

Slave X

Daisy Chain
up to 16
Humidifiers

Master

Slave 1

Multi Mode Wiring

 Connect up to 16 units (equivalent of 1600 lb/hr) using 18-24 AWG multi-strand, twisted

pair, shielded cable.

 Connect humidistats/transducers and security loop to master unit only.
 Jump the security loops on slave units.
 When connecting double units connect only to driver board A.
 See NH-EL Humidifier Configuration on page 54 and Multi on page 57 for software

configuration.

Figure 32: Multi Mode Wiring

Installation | 34

BMS

Protocol

Signal Type

Recommended

Cable

Max. Recommended Distance

from Nortec Module to BMS

Modbus

EIA-485,

2-wire

18-24 AWG

Shielded, Twisted

Pair, 120 Ω*

Should not exceed 2200 ft

Item

Default

Adjustment Range

Signal Type*

EIA-485

-

Transmission Mode*

RTU

-

Baud Rate

9600

9600, 19200,

38400, 115200

Data Bits*

8

-

Stop Bits*

1

-

Parity

Even

Odd, Even, None

Address

1

1-247

Timeout

300 s

0-300 s

Modbus Digital Control

The NH-EL humidifier comes standard with a Modbus communication interface. The Modbus
interface can be configured to control the humidifiers output or can be used to monitor its
operation. See Nortec document 2560599 – Using Modbus with Nortec Humidifiers for a listing
of Modbus parameters that are available with the NH-EL.

Wiring

Table 8 provides information on Modbus wiring requirements. The NH-EL uses a three pole
terminal, the Integrated Controller PCB, to provide Modbus communications. Connections can
be made directly to this terminal.

Table 8: Modbus Wiring Requirements

* Connect humidifiers in daisy chain to the Modbus RTU. Ground shield at one end only (BMS or humidifier)

Modbus Communication Requirements

Table 9: Modbus Communication Parameters lists the requirements for Modbus communication
with the NH-EL and the range of adjustable parameters. Adjustable parameters are set using
the LCD touchscreen of the NH-EL in the Factory Menu Level which is not accessible to users. If
the parameters must be changed from default, refer to the Nortec document 2560599 – Using
Modbus with Nortec Humidifiers.

Table 9: Modbus Communication Parameters

* Parameters not adjustable

35 | Installation

Figure 33: Small and Medium NH-EL Space Humidifiers (not to scale)

Note:

provided with them.

Options and Accessories

For installation of options and accessories follow the instructions that are

Blower Packs

The NH-EL Space humidifier models come pre-assembled with a Blower Pack mounted on the
top. Both smaller steam capacity NH-EL models (5-30 lbs/hr) and medium steam capacity
NH-EL models (50-100 lbs/hr) can be ordered for direct In-Space steam distribution.

For mounting clearances of the NH-EL Space humidifier, please refer to Figure 5 on page 11.
Installation of an NH-EL with a built on blower pack is otherwise identical to installation of an
NH-EL without a blower pack. The steam line, condensate return and wiring connections to the
blower pack have been done at the factory.
For in-space distribution with large steam size capacities humidifier (Dual cylinder NH-EL 150,

200) , the RM-BP (remote mounted blower pack) can be added to the humidifier.

Figure 34: Remote Mounted Blower Pack

For installation instructions on the RM-BP, please refer to the Blower Pack installation and
operation manual (document 2572641).

Installation | 36

Fill Cup Extension

For installations where duct static pressure exceeds 6 inches a fill cup extension kit is required.
This provides a bracket and hoses for mounting the fill cup above the humidifier. The fill cup
extension kit may be required if water runs to drain while the humidifier is filling. See chapter
on troubleshooting for more information on diagnosing fill problems.

Extreme Drain Water Cooling

For installations where drain water must be cooler than 120ºF (49ºC) a kit is available which
consists of a double fill valve. The second fill valve adds additional water to the drain cup while
the humidifier is draining to cool the water more than the single fill valve.

Note that initiating a drain using the black manual drain switch on the front of the unit will not
induce drain water cooling as it is controlled using software. See Drain Cool on page 55 for
details.

Condensate Cooling (External)

Pneumatic and electric drain water coolers are available from Nortec for installation outside the
humidifier or on condensate drains from steam traps, distributors, and SAMe headers. If

condensate cannot be routed back to the humidifier tank via the humidifier’s fill cup then an

external condensate cooler may be required to meet regulations restricting the temperature of
hot water that can be fed to drain. The external drain water cooler is only available for field
installation.

Foam Protection

NORTEC’s NH-EL includes software detection of foaming which in most cases should be
sufficient to address waters which can cause foaming. For more severe cases, an optional
foam prevention kit is available. The kit consists of an external float chamber, steam outlet,
hose and fittings required for installation. The kit can be factory or field installed.

Internal Fusing

An optional internal fusing kit is available for all models of NH-EL. The kit provides extra internal
protection to the humidifier and must always be used in conjunction with an external fused
disconnect. The Internal fusing option is only available as a factory installed option.

Remote Fault Indication

An optional remote fault kit is available that can provide remote indication of humidifier status.
The kit can be factory or field installed. See Remote Fault Option Wiring on page 33 for more
information about the remote fault indication kit.

37 | Installation

Start Up

39 Installation Check
40 NH-EL User Interface

40 Auxiliary Drain Switch

40 Door Interlock Switch

41 Start Up Procedure
42 Information Screens
43 Nortec Digital Controls

43 Demand Control

43 On/Off Control

44 Transducer Control

44 Multi Unit Operation
45 Modbus Control
45 BACnet MS/TP and IP
45 Other Building Automation Systems
45 Nortec ONLINE
46 NH-EL Pre-Start Up Checklist
47 NH-EL Start Up Checklist

Start Up | 38

Steam Line

- Adequate slope

- No restrictions

- No kinks (hose)

- Condensate traps
on long runs

P Trap .

.

with 12 in
(30 cm) min drop
.

Fused

Disconnect

Correct

voltage /

amps /

phase

per spec

label.

On/Off Controls

(Air Proving)

in series between

terminal 1 and 2

Min 10 ft (3 m)

Control

- Wired to terminal 4.

- On/Off in series between
terminal 1 and 2.

- In return duct or location
which represents humidified
space (no drafts, not by
door, not by diffuser).

Air
gap

1/2 in line min
30-80 PSI

Not plastic drain,
Not to sink.

High Limit

- Wired to terminal 5

- On/Off in series
between terminal
1 and 2

Mounting

- Unit level

- Screws into

structural member

- L Bracket on top

Spec label

Calculated absorption distance

to any obstruction or 8 - 10 ft

(2.4 - 3 m) if unknown.

2 x duct height

from fan or

transition

SPACE

SPACE

Installation Check

Before turning on power to the NH-EL, inspect the installation to ensure that it was carried out
correctly. Refer to Figure 35: Installation Check, to the NH-EL Pre-Start Up Checklist on page
46, and to the chapter on Installation that starts on page 9.

Figure 35: Installation Check

39 | Start Up

Touch Screen Display

Provides status
information as well
as a user interface
for configuring the
humidifier.

Status LED

Single LED changes
color to indicate status.

Door Interlock Switch

NOTE:

(prevents contactor from
engaging when door is open)

Pull out with door off

to override.

On/Off Switch

(Turns humidifier On/Off)

Auxiliary Drain Switch

(Can be used to drain
cylinder without software)

Caution: Power to the humidifier should always be turned off using the dedicated external

the humidifier.

NH-EL User Interface

Figure 36: NH-EL User Interface

Auxiliary Drain Switch

In addition to software controlled draining of the cylinder, the NH-EL has a manual drain switch
which can be used to drain the cylinder even if software is not functioning. To drain the cylinder
put the switch into the drain position. For normal operation the switch should be in the off
position. If the unit has multiple cylinders, the switch will have both “Cylinder A” and “Cylinder
B” settings. This allows single-cylinder draining.

Door Interlock Switch

The door interlock switch cuts power to the contactor when the door is removed. It is an
additional safety device intended to prevent the possibility of service technicians coming into
contact with live electrical wiring while working on the humidifier. Pull the switch out with door
off to override.

disconnect before removing the door or side panel, or before doing any service work on

Start Up | 40

Note: If operated on low conductivity water it may take several hours for the NH-EL to reach

full output capacity. This is normal. During this time the status will cycle between “Filling”

and “Warning – Max Level”. The humidifier will not perform any drains and will concentrate
the cylinder water until required capacity is reached, at which point it will indicate

“Humidifying”.

Warning: Damaged units or improperly installed units must not be operated. Damaged or

improperly installed units may present a danger to persons and property.

Start Up Procedure

1 Examine the humidifier and installation for damage and/or improper installation.
2 Ensure that the doors are in place and secured with retaining screws.
3 Open the supply water shut off valve.
4 Turn on the mains power using the installed disconnect.
5 Press the On/Off switch on the front of the humidifier to turn the humidifier on.

The display will show a splash screen then a few seconds later the
main status screen will be displayed indicating the humidifier is in
normal operation mode. If no faults or warning conditions are
detected the LED will be either solid, or flashing green.

If a warning or fault condition is detected it will be displayed on the
status screen and the status LED will be yellow for a warning or red
for a fault. See troubleshooting section for information on
diagnosing and correcting faults.

Note: The information displayed depends on the configuration of
the NH-EL and the actual operating conditions. It may vary from the
display shown.

6 If On/Off or a control humidistats have been installed, check and adjust the control setpoint

on the control and high limit humidistat (see Nortec Digital Controls on page 43). If
transducer controls have been installed then adjust the humidity setpoint using the touch
screen display (see NH-EL Humidifier Configuration on page 54)

7 When either the external humidistat or internal controller generate a demand for humidity

higher than 27% and the security loop is closed the LED will turn solid green, the main
contactor will engage, the fill valve will activate (after a delay) and the cylinder will slowly fill
with water.

Note: While the cylinder is filling with water there should be no water flowing down the drain. If

water is flowing down the drain it can indicate excessive backpressure or a leaking drain
valve. See General Troubleshooting on page 72.

8 It can take 15 – 20 minutes or longer for a large humidifier to fill, for the water to be heated

up by the submerged electrodes, and for steam to be produced.

41 | Start Up

Use Up/Dn arrows
to move to other
screens.

 In addition to the main status screen, the NH-EL

includes several information screens which
provide additional information about the
humidifier. The additional screens can be
reached by pressing the “(i) About” button at the
bottom of the status screen display.

To page down and up through the screens, use
the up / down arrows located at the top of the
screen.

 The Information screens also provide access to

an output graph that displays a trend graph,
indicating the performance of the humidifier. To
view the graph press “View”.

The - / + buttons on the screen change the time
scale at the bottom of the graph.

Buttons at the bottom of the screen
activate/deactivate display of indicated data.

 The Humidifier Status screen shows the control

mode configuration. Control Mode must be set
to match humidistats/ transducers connected to
the humidifier.

Figure 37: Information Screens

Information Screens

Start Up | 42

Output signal is shown on
modulating controller
proportional to the demand.

State of On/Off humidistat

Setpoint (RH%)

Humidity (RH %)

Indicates the

humidistat is on.

A half moon

indicates it is off.

Snowflake indicates the

setpoint is being

overridden by outdoor

temperature.

Option button accesses
sensor calibration.

See troubleshooting

Increase / Decrease Setpoint

Power button turns

off the humidiistat if

pressed for 2 seconds

Caution:

screen do not match those connected to the humidifier.

 Improper control configuration can result in over humidifying which can result in damage

to property.

 See Advanced Control Configuration if the controls displayed in the humidifier Status

Nortec Digital Controls

Nortec provides optional On/Off, Modulating Control, or Transducer digital controls. Figure 38
and Figure 39 show the function and meaning of the Digital Control’s display and buttons. All
controls are available either wall mounted or with a remote sensor for duct mounting.

Demand Control

The modulating controls use a PI control algorithm to transmit a 0-10V control signal to the
humidifier. Adjust the setpoint to the desired setting by using the up/down arrow buttons on
the controller.

On/Off Control

The On/Off controls use a PI control algorithm to open and close a relay that opens and closes
the humidifier’s security loop. Adjust the setpoint to the desired setting by using the up/down
arrow buttons on the controller.

43 | Start Up

Figure 38: Modulating and On/Off Digital Control Operation

Humidity (RH %)

Option button accesses

sensor calibration.

See troubleshooting

Adjust calibration

while in calibration

mode

Power button will

display “NO” if an

attempt is made to

turn off the transducer.

Note: It is possible to field calibrate NORTEC Digital controls if the displayed humidity is found to be

Troubleshooting.

Note: See

humidifiers in a multi mode system.

Transducer Control

The transducer controls transmit a 2-10V control signal proportional to the sensed relative
humidity to the humidifier. Humidity setpoint is not set at the transducer. The setpoint is set on
the NH-EL’s display.

Note: It is possible to field calibrate NORTEC Digital controls if the displayed humidity is found

to be different than a known trusted source. See Digital Humidistat on page 74 of

different than a known trusted source. See Digital Humidistat on page 74 of chapter on

chapter on Troubleshooting.

Multi Unit Operation

Start up of each humidifier configured and installed for multi mode operation is the same as
starting up standalone humidifiers with the exception that for the humidifier to fill and produce
steam the demand to the master unit must be greater than the Zero Out setting of the unit
being started. (Example for a slave unit configured to operate between 20 and 30% the demand
to the master must be greater than 22.7%).

Each unit connected in a multi mode system will display its demand as a percentage of the
range for which it is configured. Example, a slave unit configured to operate between 20 and
30% demand will display a demand of 50% when demand to the master is 25%.

Figure 39: Transducer Control Operation

Note: See Multi on page 57 for software configuration, and Multi Mode Wiring on page 34 for

Multi on page 57 for software configuration, and Multi Mode Wiring on page 34 for wiring of

wiring of humidifiers in a multi mode system.

Start Up | 44

Modbus Control

If the humidifier is to be controlled using the standard Modbus interface then the Source
parameter in the Control Setting Menu must be set to Modbus (see page 56). When Source =
Modbus the humidifier will operate on the basis of digital inputs from the Modbus network and
ignore any analog inputs. See Modbus Digital Control on page 35 for other requirements for
Modbus control and/or monitoring.

BACnet MS/TP and IP

If the humidifier is to be controlled using the standard BACnet IP interface, then the Source
parameter in the Control Setting Menu must be set to BACnet (See page 60). See supplemental
Building Management manual for more information.

Other Building Automation Systems

Additional protocols such as LonWorks and Johnson N2 can be used with the NH-EL by
purchasing the respective Building Automation System option. See supplemental Building
Management manual for more information.

Nortec ONLINE

Nortec OnLine enables a humidifier to communicate and be monitored through the Internet.
Nortec OnLine is built into the NH-EL. See Nortec Online on page 60 for configuring the NH-EL
to operate on Nortec Online. See supplemental Building Management manual for more
information.

45 | Start Up

NH-EL Pre-Start Up Checklist

Unit Serial #: _________________ Tag: _______________

Unit type: _______ __________ Voltage: ________V/_____ph Steam output: ______lb/hr

Cylinder type: Customer/Job: Address:

Water Quality:

 Well water  City water  Softened water 

Humidifier Mounting: (Clearances around the unit)

 Level  Front/Side Clearance 

Steam Line(s):

 Slope up (min 2 in/ft).  Slope down (min 0.500 in/ft) 
 Diameter / Size Material
 Low point condensate traps  No Hose Kinks / Restrictions 
 Type of Insulation

Condensate Line(s):

 P Trap min 6 in or duct press + 2 in  P Trap min 12 in drop 

Water Line:

 Conductivity 150-750 microsiemens  Water pressure: 30-80 psig 

Drain Line:

 Air gap within 3 ft of the unit  Diameter / Size

Cylinder:

 Seated in drain valve and secured yes  no 

Wiring:

 Wiring connections and connectors secured yes  no 

Controls:

 Control Location Control to Terminal 4 
 High Limit Location High Limit to terminal 5 

Power:

 Voltage, amp, fuse per Spec Label: yes  no 
 Disconnect switch located close to humidifier yes  no 
 Panel Number

Inspected by: Date of inspection: ______/_______/______

Company:

Start Up | 46

Note: Most water does not contain enough conductivity for full boil on initial start-up. Units

will need to concentrate the water over a time period (hours to days). It is normal for
the humidifier status to cycle between “Filling” and “Warning – Max Level” indicating
water level is at the top of the cylinder during this time period.

NH-EL Start Up Checklist

Unit Serial #: _________________ Tag: _______________

Unit type: _______ __________ Voltage: ______V/____ph Steam output: ______ lb/hr

Cylinder Type: Customer/Job: Address:

Preliminary:

 Pre-start-up checklist completed? yes  no 

If no, perform Pre-Start-up Checklist before starting humidifier.

Start-Up Procedure:

The prerequisites for the humidifier filling and contactor pulling in to make steam are as follows:

 Plumbing door in Place and secured with screw yes  no 
 Water supply valve opened yes  no 
 Mains disconnect switched on yes  no 
 Turn on the On/Off switch yes  no 
 On/Off Security loop (Terminal 1 and 2) closed yes  no 

Controls:

 Installed Controls Match Configuration yes  no 

 Control Setpoint: High Limit Setpoint:

 Demand (Modulating Humidistat) yes  no 

or

 Sensed RH < Setpoint (Transducer) yes  no 

The Humidifier will undergo a self-test when the power is turned on activating the LED’s and other
internal components.

If the above listed prerequisites are fulfilled the humidifier will start filling the cylinder and begin
normal operation.

Remarks:

Started by: Date of Start Up: _______/_______/______

Company:

47 | Start Up

Operation

49 LED Status Lights
51 How the Humidifier Works

51 Steam Generation

51 Drains

51 Steam Distribution

52 Selecting an RH Setpoint
54 NH-EL Humidifier Configuration

54 Navigating the NH-EL Software

54 Main Menu (NH-EL Password)

55 Configuration Submenu

55 Features Submenu

56 Controls Submenu

57 Multi Mode

58 General Submenu

59 Comms. Submenu

61 Service Submenu

61 Admin Submenu

Note : For Description of Components in Introduction:

3 Humidifier Components
4 Description of Components

Maintenance and Servicing | 48

Red - Fault

Indicates the controller has detected a

fault condition and stopped humidifier.

Check display for fault information.

Yellow - Service

Indicates that service may be required

or that the water level is high. Check

display for warning information.

Green ON LED On

ON LED Blinking

Indicates steam is being produced.

Indicates no demand or safety loop

open.

Status LED

The NH-EL has a single LED that

changes color to indicate Status

Warning – Max Level

only and unless it persists for an extended period of time it does not require any action.

Security Loop

information only and does not require any action.

LED Status Lights

The keypad and display panel includes a single tri-color LED which provides information about
the humidifier status.

Common Warnings

The following two warnings are common during normal operation and do not normally indicate
that service is required. For a new cylinder the Level Sensor On warning indicates that full
capacity cannot be reached because cylinder water is not concentrated. For an old cylinder the
Level Sensor On warning may be an indication that the cylinder will soon have to be replaced.

The above warning is normal during the start and end of a cylinder life. It indicates that

the high water sensor has interrupted filling of the cylinder. It is displayed for information

Figure 40: LED Status Lights

49 | Maintenance and Servicing

The above warning is normal during operation. It indicates that one of the security loop
devices connected between control terminal 1 and 2 is open. It is displayed for

Control Board

Contactor

Steam Distributor

Steam Line

Cylinder

Drain Canal

Fill Valve

Condensate Return

Fill Cup

Overflow

Electrodes

Internal Air
Gap

Drain Valve

High

Water

Sensor

External Air
Gap

Air Gap

Current Sensor

Driver Board

Humidifier Schematic

Figure 41: Humidifier Schematic

Maintenance and Servicing | 50

Note: The cylinder is gravity fed from the fill cup. If backpressure from the steam line is too high it will
cause water to back up in the fill cup and flow down the overflow line to the drain.

How the Humidifier Works

The NH-EL is an atmospheric steam generator that uses heat generated by electrical current
flowing between submerged electrodes to generate heat and steam. The NH-EL is designed for
air humidification via steam distributor, blower pack, or steam manifold (SAM-e).

Steam Generation

 Once the unit receives a demand signal, the door interlock switch is closed, and the security

loop between terminal 1 and 2 is closed, the humidifier closes the contactor and measures
the current.

 If the demand is lower than the actual output, the inlet valve is kept closed and output is

reduced by letting the water level in the cylinder decrease by evaporation.

 If demand is higher than the actual output, after a brief delay, the fill valve is activated and

water flows into the fill cup. Water from the fill cup flows into the bottom of the cylinder
through a hose connected to the drain valve housing.

Note: The cylinder is gravity fed from the fill cup. If backpressure from the steam line is too

high it will cause water to back up in the fill cup and flow down the overflow line to the
drain.

 As soon as the water in the cylinder comes in contact with the energized electrodes current

flows through the water. The resistance of the water to the electrical current heats the
water and turns it to steam. The more the electrodes are covered by water the higher the
current and output. The unit continues to fill until the current matches demand or the high
water sensor detects a high water level.

 The NH-EL repeats the fill and boil down cycle repeatedly to match output to demand.
 Over time minerals in the water will adhere to the cylinder electrodes. The humidifier will

automatically fill to a higher water level to maintain full capacity during the life of the
cylinder. Eventually, because of scale formation, it will no longer be possible for the
humidifier to reach its full capacity. The NH-EL software monitors this condition and will
display a warning when the cylinder needs to be replaced.

Drains

 As steam is produced, minerals are left behind, increasing the conductivity of the water. The

NH-EL’s patented auto adaptive cycle will monitor the water conductivity and perform drains
to maintain the water at optimal conductivity for peak performance.

 The auto adaptive cycle provides the longest cylinder life in combination with keeping the

tightest control and most efficient use of water during the entire cylinder life.

Steam Distribution

Steam generated by the humidifier may be introduced into the air in several different ways. The
most common method for adding the steam into the air is to mount a steam distributor tube in
a supply air duct as shown in Figure 41: Humidifier Schematic. For larger ducts, or larger loads,
it is also common to use a steam manifold with a single steam line connection and multiple
tubes for distributing the steam (see Figure 42: SAM-e Manifold). For introducing steam directly
into a room, humidifier mounted or remote mounted blower packs are used (see Figure 43:
Remote Blower Pack).

51 | Maintenance and Servicing

Note: The job site design may have specified a setpoint chosen specifically for the site.

the site.

Condensate Return

The condensate must be collected and removed from the distribution system so that it does not
build up and leak into the duct (or room if blower pack is used). Condensate can be returned to
the NH-EL fill cup to reduce water waste, or can be fed to drain.

Selecting an RH Setpoint

The optimum humidity setpoint depends on the reasons that a space is being humidified. The
“ASHRAE Handbook – HVAC Applications” recommends specific design relative humidities for
specific applications. Also see NORTEC publication “When You Need Humidity” (Form 124A) for
more information on humidity settings.

Health and Comfort - The benefit of humidity is most pronounced for health and comfort in the
40-60% range. A humidity setting of 40-50 % is recommended for this purpose to prevent over
humidifying.

Refer to site documentation and where possible use setpoints specifically determined for

Temperature Setback - In cold climates it is often necessary to reduce the humidity level in a
space to prevent build up of condensation on the inside of exterior walls, windows, and trim. It
is highly recommended that the temperature setback function of the NORTEC digital controls be
used under these conditions to prevent damage from condensation. The digital control with an
outdoor temperature sensor installed will automatically setback the humidity setpoint to
correspond with outdoor temperature.

Duct High Limit – The duct high limit is intended to prevent saturation and wetting in duct work
at high load conditions. NORTEC recommends a setting of 85% for the duct high limit. It may
be necessary to reduce this setting if the duct work is very cold or in contact with exterior cold
surfaces.

Maintenance and Servicing | 52

SAM-e Manifold

Steam Line

“P” Trap

Condensate Drain

Blower Pack

Condensate

Drain

“P” Trap

Steam Line

Figure 42: SAM-e Manifold

53 | Maintenance and Servicing

Figure 43: Remote Blower Pack

NH-EL Humidifier Configuration

Navigating the NH-EL Software

Figure 44: Navigating the NH-EL Software

Main Menu (NH-EL Password)

The menu levels of the NH-EL are password protected to prevent configuration changes by
unauthorized persons. In order to access the menu level press the Menu icon and when
prompted enter the password 0335.

Enter Password

Press the Menu button from the main status
screen. Enter the user level code 0335. Press
the check mark to accept the entered password.

Main Menu

From here you can access the Configuration,
Service, Setpoint, and Administrator submenus.
Select any sub-menu by touching it on the
screen.

Note: Do not make changes unless you are
familiar with the software.

Maintenance and Servicing | 54

Configuration Submenu

The configuration submenu provides access to most user configurable settings. It is further
broken down into Features, Control Settings, General, and Comms. submenus. Select any
submenu by touching it on the screen.

Figure 45: Configuration Submenu

Features Submenu

Drain Cool

When On the fill valve is activated at any time that the drain valve is
activated to cool the drain water. (Default = On).

Idle Mode

Configures operation when no demand is present. Idle Only = no action.
Idle Drain = drain cylinder after Idle Drain Time. Keep Warm = keep
cylinder warm by periodically engaging contactor. (Default = Idle Drain).

Idle Drain Time

When Idle Mode = Idle Drain configures time the humidifier waits with no
demand before the cylinder is drained. (Default = 72 hours).

3DD Force

When On the humidifier will drain the contents of the cylinder every 3 days
regardless of demand or idle condition. It can improve performance for
water conditions with sediment or other contaminants. (Default = Off).

Dfactor

Increases or decreases the drain time used to control cylinder water conductivity. It should not
normally need to be adjusted. A NORTEC representative will provide instructions if it should
need to be adjusted. (Default = 1.0).

Drain Mode

Configures when a corrective drain will be performed in case the software detects excess
current. Fixed ED = drain at 115% of full capacity. Float ED = drain at 115% of current
demand. (Default = Fixed ED).

Foam Mode

These settings can be used to detect foaming in the cylinder and take corrective action. Basic
is a software only setting. Advanced requires installation of a hardware kit. (Default = Off,
Default with Kit = Advanced).

Cal. Drain Mode

Sets how the humidifier drains to control cylinder water conductivity. Basic = normal drain,
Prefill = fill then drain, Multi = fill then drain to trigger point until drain duration elapsed. (Default
= Basic).

55 | Maintenance and Servicing

CAUTION: Improper control configuration can result in over humidifying
which can result in damage to property.

(Features Submenu Continued)

Double Mode (NH-EL 150-200 only)

Parallel = cylinders operate in parallel from one set of control signals.
Sequenced = cylinders operate in series from one set of control signals.
Independent = two sets of controls signals and each cylinder follows one of
the sets.

Manual Cap

Reduces the maximum capacity of the humidifier to a percentage of its full
capacity. Use up/down buttons to increase/decrease and press
checkmark to save the setting.

Ground FI

When “On” the contactor will be disengaged whenever the drain valve is
activated to prevent current leakage to the drain. (Default = Off).

Fill Stop

When activated during a fill cycle the fill valve will be turned off when current equals 95% of
demand to prevent overshooting the demand. (Default = Off).

Overcurr

Adjust only if instructed by NORTEC Representative. (Default = 0.00)

Low Conductivity

Prevents false “Spent Cylinder” codes. Set to On if water conductivity is below
250 microsiemens. (Default = Off)

Short Cycle

When “On” reduces the capacity if short cycling is detected. This will reduce the possibility of
short cycling. (Default = Off).

Controls Submenu

Control Settings allow you to set the type of external controls the humidifier is connected to. In
most cases, the NH-EL humidifier is factory configured to operate with the external controls that
were specified for the site.

Source

Configures the humidifier to either accept analog control signals from a
humidistat or digital signals from a Building Management System.

Control Mode

Configures the type of control used with the humidifier. RH (P) is
proportional only internal control based on a transducer signal. RH (PI) is
proportional control with an integral.

Control Channels

Configures the humidifier to either operate with a single channel (control
only) or dual channel (control and high limit).

Channel 1/2 Type

Configures the Volt or amp range of the control signal connected to Channel 1/2. Can be used
to configure the humidifier to be On/Off. However, Nortec recommends using the Security Loop
for On/Off applications.

Maintenance and Servicing | 56

Note: Set P, Prop Band, and Int Time will only be displayed in the menu if Control Mode

(Controls Submenu Continued)

is set to RH (P) or RH (PI).

Setpoint Channel 1/2

Sets the humidity setpoint value. The humidifier will attempt to maintain
this humidity level in the space where the control transducer is installed.
The controller evaluates demand for both channels (if activated) and uses
whichever is lower.

Band Channel 1/2

Band should not have to be changed under normal conditions. The Band
setting adjusts the proportional band within which the humidifier will
modulate between 0 and 100% output. At set point +Prop Band the
output will be 0. At set point – Prop Band the output will be 100%.
(Default 15%).

I Time Channel 1

I Time should not have to be changed under normal conditions. In order to
correct for error inherent in proportional control, the controller will increase
/decrease output by Setpoint-Actual humidity. The I Time adjusts the
frequency at which the correction is performed. (Default 5 min).

Damp Channel 2

Damp Channel 2 should not have to be changed under normal conditions. In order to prevent
rapid cycling between Channel 1 and 2, Damp provides a delay time before Channel 2 is used
as the demand source. (Default 5s).

Multi Mode

To Operate in Multi Mode the following is required.

 One humidifier must be designated the master and all others as slave units.
 The master unit must be the unit to which external controls, including security loop, are

connected.

 Each humidifier in the system, including the master, must have the range of demand signal

in which it will operate configured. Based on the setting of the Full Out and Zero Out the
humidifiers can be configured to operate in parallel or in series.

Parallel Operation – When Full Out = 100% and Zero Out = 0% for the master and every slave
humidifier connected, all humidifier’s will output the same amount to meet the zone
humidification demand. The advantage is even wear on all units.

Series Operation – When Full Out and Zero Out are set to different ranges for each humidifier
they will each only operate when the demand is equal to, or greater than, the Zero Out setting.
The advantage is the turndown ratio of a single unit. The Full Out - Zero Out range of each unit
is based on its capacity divided by the sum of all the connected units capacity. To provide even
output, the Zero Out of each unit in series should be equal to the Full Out of the proceeding unit.

Example: 2 x 200 lb/hr units and 1 x 50 lb/hr unit are to operate in series.

 Master Unit (50 lb/hr) - Zero Out = 0, Full Out = 50 / (50+200+200) = 11%

57 | Maintenance and Servicing

NOTE: The Full Out and Zero Out selections are only displayed if Multi Mode

 Slave 1 (200 lb/hr) - Zero Out = 11%, Full Out = 11+(200/(50+200+200))= 55%
 Slave 2 (200 lb/hr) - Zero Out = 55%, Full Out = 55+(200/(50+200+200))=99%

Note: To obtain the best turn down ratio possible the smallest unit should be configured to

come on first.

When more than one humidifier is required to satisfy the demand of a single zone the units are
all operated from a single control signal. By using the Multi Mode function of the NH-EL the
control signal only needs to be connected to one master humidifier. All other humidifiers
serving the zone must then be connected using the linkup terminal (J10) on the NH-EL control
board (See Multi Mode Wiring on page 34). Additionally, all slave units must have a jumper on
the security loop.

Multi Mode
Use Multi Mode to configure the humidifier to operate as one humidifier of
a group controlled by a single control signal / transducer signal. (Default =
Standalone)

Full Out

System demand at which the humidifier should output its full capacity
(Default = 100%).

Zero Out

System demand at which the humidifier should shut off (Default = 0%)

is set to either Master or Slave. It is not displayed in Standalone mode units

General Submenu

The General menu allows you to set the date, time, language, units and general display settings.

Date

Sets the date. Enter MM/DD/YYYY. Use arrows to move to digit you wish

to change or press “Delete” to clear entry completely. Press checkmark to

save changes.

Time

Sets the time of day. Use arrows to move to digit you wish to change.
Press “a”(2) for am, “p”(7) for pm. Press checkmark to save changes.

Language

Select the desired language and press the checkmark to save changes.

Unit

Select the desired units and press the checkmark to save changes.

Contrast

Increase/Decrease screen contrast. Press checkmark to save changes.
(Default = 8)

Brightness

Increase/Decrease screen brightness. Press the checkmark to save
changes. (Default = 52)

Date / Clock Format

Select the desired format and press the checkmark to save changes.

Maintenance and Servicing | 58

Comms. Submenu

The Comms. Submenu allows the user to configure the humidifier for operation on a TCP/IP
network, Modbus network, or BACnet IP network.

Allow Remote Disable

Sets whether the humidifier can be disabled remotely by a Building
Management System. Select Yes or No and press checkmark to save
settings. (Default = No).

IP Type

DHCP = Automatically acquire network address settings, Fixed = manually
configure network address and settings. (Default = DHCP).

IP Address

The IP address of the humidifier. Should only be configured if IP Type =
Fixed.

Subnet Mask/Default Gateway/Primary DNS/ Secondary DNS

Network configuration parameters for the humidifier. Should only be
configured if IP Type = Fixed.

MAC Address / Host Name

The MAC address and Host Name of the humidifier. For information
purposes only and cannot be changed by the user.

Modbus

On = The humidifier will connect to a Modbus network. Additional Modbus
parameters are only displayed if Modbus = On. (Default = Off).

Modbus Address

The Modbus address that has been assigned to the humidifier on the
network. (Default = 10).

Parity

Sets the parity that the humidifier will use for communicating on the
Modbus network. Select the desired parity and press checkmark to save.
Reboot to implement save. (Default = Even).

Baud Rate

Odd/Even Sets the baud rate the humidifier will use for communicating on the Modbus network.
Select the desired baud rate and press checkmark to save. Reboot to implement save.
(Default = 9600).

BMS Timeout

Sets a maximum time the humidifier will wait with no communication from the Modbus network
before a Modbus timeout warning is generated. Exceeding the timeout also stops humidifier
operation if the humidifier Source is set to Modbus in the Controls Menu. (Default = 300s).

59 | Maintenance and Servicing

BACnet

MSTP = Use a BACnet MSTP connection. IP = Use a BACnet IP connection.
Off = No BACnet connection. (Default = Off).

Device Name/Description/Location

Used to set a name, description, and location of the humidifier. To enter
letters repeatedly press numeric key until desired letter is displayed (eg
press “2” twice to enter “a”. Press checkmark to save setting.

Node ID

Sets the node ID the humidifier will use on the BACnet network. Select the
desired value using up/down arrows and press checkmark to save.
(Default = 79).

BACnet IP Port

Sets the IP Port the humidifier will use on the BACnet network. Select the desired value using
up/down arrows and press checkmark to save. (Default = 47808).

BMS Timeout

Sets a maximum time the humidifier will wait with no communication from the BACnet network
before a BACnet timeout warning is generated. Exceeding the timeout also stops humidifier
operation if the humidifier Source is set to BACnet in the Controls Menu. (Default = 300s).

Nortec Online:

Enabled: When enabled the humidifier will connect to Nortec Online.
Additional Online parameters are only presented when Nortec Online is
enabled. Default setting Disabled.

Online Status:

Displays the status of Nortec Online either Connected, Disconnected or
Waiting for registration

PIN:

A unique PIN number assigned and written to the humidifier by the Nortec Online server

Serial Number:

Displays the serial number of the humidifier.

JID:

A unique Jabber ID used by the humidifier to communicate with the Online server, including
registration, real time data transfer and historical data downloading.

Maintenance and Servicing | 60

Service Submenu

Cylinder A/B Reset
The humidifier uses information about cylinder replacement to optimize
the performance of the humidifier. Only after replacing a cylinder select
Reset Cylinder, and then press the Yes button.

Drain Cylinder

Allows the user to drain the cylinder(s). Select the cylinder(s) that should
be drained and press the checkmark. To interrupt draining press cancel.

Fault / Service History

Displays the fault / service events that have been recorded by the
humidifier.

Reset Fault/Service History

Deletes the list of Faults/Service events stored in the Fault / Service
history. Resetting the fault / service history is not normally required, but
can be done after repairs to remove faults that are no longer needed.

Export History

Allows export of the service history to a USB memory stick plugged into the
humidifier controller USB port. The file can be sent to Nortec for analysis.

Input Diagnostics

Displays a list of the humidifier’s inputs and the current status/value.

Output Diagnostics

Displays a list of the humidifier’s components and remote indication relays. The components
and relays can be activated for diagnostic purposes.

Admin Submenu

Setpoint Password

Yes = The humidifier will prompt a user for a password in order to change
the setpoint from the main status screen. No = allows any user to change
the setpoint from the main status screen without a password. (Default =
Yes)

Main Menu Password

Sets whether a password is required to access the main menu. No =
pressing Menu on the main status screen opens the Main menu without
requesting a password.

Software Update

Initializes a software update from a USB memory stick plugged into the humidifier controller
USB port.

61 | Maintenance and Servicing

Maintenance and Servicing

63 Required Maintenance

63 Cylinder Spent Warning / Fault

64 Replacement Cylinder

65 Removing the Cylinder

66 Drain Valve Cleaning

67 Installing the New Cylinder

68 Extended Shutdown

68 Starting After Extended Shutdown

69 NH-EL Maintenance Checklist

Maintenance and Servicing | 62

Status LED Yellow

+

Cylinder Spent

=

Cylinder is Spent and

must be replaced.

Fault LED On

+

Cylinder Spent

=

Cylinder is Spent and

must be replaced.

Humidifier has

shut down.

Danger:

serious injury or damage to property.

Required Maintenance

The NH-EL humidifier has been designed to require very little maintenance. Regular
maintenance consists of checking the humidifier to ensure it is in good condition, replacing the
cylinder when the software advises that the cylinder is spent (and changing the o-ring), as well
as cleaning out the drain valve whenever the cylinder is replaced.

Cylinder Spent Warning / Fault

The steam cylinder is disposable and must be replaced at end of cylinder life. Cylinder life is
dependent on water supply conditions and humidifier usage.

Resetting and/or servicing a spent cylinder to extend operation will void warranty and could cause

Warning

When the software
determines that the
cylinder is spent, it first
displays a warning and
turns on the yellow
service LED. The
humidifier will continue
to operate for another
72 hours after the
warning is displayed.

63 | Maintenance and Servicing

Fault

After 72 hours the
humidifier will display a
fault and shut down.

If a replacement
cylinder is not yet
available, the humidifier
can be temporarily put
back into service by
turning the humidifier
off and on. The
humidifier will run for
another 72 hours at
reduced capacity.

Figure 46: Cylinder Spent Warning / Fault

Electrode Pin

Connect color coded cylinder
plugs to pin with corresponding
color label. There may be 2, 3
or 6 connections depending on
cylinder.
The spring loaded plug should
fit snugly on the pin. Replace if
loose or any signs of damage.

Steam Outlet

Secure steam hose to
outlet with hose clamp.

Electrode Internal
Mounting Point

High Water Sensor Pin
Has a plastic collar
around it. Connect

orange high water
sensor wire here.

Label

Identifies cylinder type in
top left. Always replace
cylinder with the same
model.

end of life.

Replacement Cylinder

The label on the existing cylinder identifies the cylinder type in its top left corner. When ordering

a cylinder always quote the three or five digit model number on the label, the humidifier’s serial

number and the humidifiers voltage. Serial number and voltage are located on the specification
label on the right side of the humidifier.

Note: Nortec recommends keeping several replacement cylinders in stock throughout the
humidification season. This will prevent possible downtime when the humidifier reports cylinder

Figure 47: NH-EL Cylinder

Maintenance and Servicing | 64

Manual Drain Switch

On/Off Switch

Door Screw

Cylinder Plug

Lift vertically

Hose Clamp

Tilt cylinder

forward to clear

hose and then

lift from drain

valve.

Cylinder

SPACE

Warning

Removing the Cylinder

 Disconnect main power at the external disconnect before any servicing.

 The plumbing and electrical compartments contain high voltage components and

1 Drain the existing cylinder. Press Drain Icon on the display. If asked for a password enter

2 Close supply water shut off valve.
3 Turn the humidifier On/Off switch off.
4 Turn off power to the humidifier with the external disconnect.

wiring. Access should be limited to authorized personnel.

 Cylinder may be hot, take care when handling.

0335 and press the checkmark. Either press “Yes” to confirm the cylinder should be
drained or, for a double unit, select which cylinder(s) should be drained and then press
“Yes”. The display will show that the unit is being drained. Let the humidifier drain until no
more water is flowing out to drain. The NH-EL will count down the drain time with a 20
minute timer.

5 Loosen the plumbing door screw and remove the door.
6 Remove the cylinder plugs from the cylinder pins by pulling vertically.
7 Using a flat screwdriver, loosen the hose clamp where the hose is connected to the cylinder.
8 Using a small flat screwdriver, press the tab on the cable tie holding the cylinder in place

9 Tip the top of the cylinder forward to pivot it out of the steam hose. When free of steam

and pull the cable tie open.

hose lift the cylinder out.

65 | Maintenance and Servicing

Figure 48: Cylinder Removal

Cylinder Port
and O-ring

Ground Wire

Spade Connectors

Solenoid

Brass Nut
(Actuator)

Hose and

Hose Clamp

Screws

Drain Valve Cleaning

Always clean the drain valve before installing a new cylinder. Scale from the spent cylinder may
have fallen into the drain valve and could prevent its proper operation. To properly clean the
drain valve it must be removed and disassembled.

Note: Be sure to reattach the green ground wire to reduce the risk of electrical shock.

1 Disconnect spade terminals from the drain valve.
2 Remove the screw holding the green ground wire and the two screws holding the valve to

the drain pan.

3 Squeeze the tabs of the spring clamp holding the hose to the drain valve and slide it up the

hose. Pull hose from drain valve. Lift the drain valve from the drain pan.

4 Unsnap red coil cap on solenoid and remove the solenoid from the valve.
5 Loosen brass nut holding actuator to plastic housing with a wrench and disassemble

actuator.

6 Clean actuator components and valve housing (inlet port, outlet port, and cylinder port). Put

new o-ring that was supplied with new cylinder into valve.

7 Reassemble actuator making sure tapered end of spring is oriented as shown in Figure 50:

Drain Valve Actuator Assembly. Tighten brass nut 1/4 turn past hand tight.

8 Clean out end of hose and reattach to valve. Slide hose clamp back in place and place valve

into drain pan.

9 Secure valve with 2 screws and attach green ground wire to solenoid.

Figure 49: Drain Valve

Maintenance and Servicing | 66

CAUTION: Make sure the new cylinder is the same model as the one that was removed. Model number

Sleeve
and
Solenoid

Spring

Plunger

(Note Orientation)

NOTE: If the “Cylinder Reset” is not performed the humidifier will operate for 72 hours and then fault

Figure 50: Drain Valve Actuator Assembly

Installing the New Cylinder

1 Insert cylinder into drain valve. Tilt cylinder forward and fit end of steam hose to steam

2 Secure cylinder with the reusable cable tie. Hand tighten hose clamp being careful not to

3 Attach color coded cylinder plugs to the corresponding color coded cylinder pin. Push down

4 Replace the humidifier door and secure with door screw.
5 Turn on power to humidifier with the external disconnect.
6 Open supply water shut off valve.

is on top left corner of cylinder label.

outlet. Tip cylinder back into place.

over tighten and crush the plastic cylinder steam outlet. The Maximum torque is 12 in-lbs
for 7/8”Nortec steam hose and 16 in-lbs for 1 3/4" Nortec steam hose.

completely. Connect high water sensor plug. Spring loaded plugs should fit snuggly onto
the cylinder pin. Replace if they are loose or damaged.

7 Turn the humidifier On/Off switch to On.
8 After the software has completed its start up self check reset the cylinder by pressing in the

cylinder box of the status screen and confirming the cylinder was replaced in the following
screen.

on cylinder spent!

67 | Maintenance and Servicing

Note: As long as the NH-EL is powered, it will automatically drain the cylinder when

Extended Shutdown

Should it be required to disconnect power to the humidifier for a period of extended shut-down,
always drain the cylinder first.

1 Utilize the Drain Cylinder function on page 61
2 Wait until the humidifier is completely drained (20 minutes).
3 Turn the On/Off switch to the Off position.
4 Shut off power to the humidifier with the external disconnect.
5 Close the supply water shut-off valve.

there has not been a call for humidity for an extended period of time. This feature will
reduce or prevent the possibility of corrosion of the electrodes and the accumulation of

algae and bacteria growing in the cylinder. The cylinder will remain empty until there is

a call for humidity at which time the fill valve will open and refill the cylinder. The unit
will go through its normal process for optimum operation.

Starting After Extended Shutdown

1 Check to see the humidifier has not been damaged and the installation has not been

altered. Refer to the Chapter on Start Up.

2 Turn on the power to the humidifier with the external disconnect.
3 Turn the On/Off switch to the On position.
4 Drain the humidifier completely by pressing and releasing the manual drain button. Wait

until there is no water flowing to drain. It usually takes less than 10 minutes.

5 Follow the start up procedure in the chapter on Start Up.

Maintenance and Servicing | 68

NH-EL Maintenance Checklist

Model #: _________________
Serial #: _________________ Tag: ________
Cylinder #:

Cylinder / System Check

 Warning Cylinder Spent  Fault Cylinder Spent 

(If software displays Warning Cylinder Spent then cylinder must be replaced)

 Yellow LED On with Max Level Warning. 

(If Yellow LED is On with Max Level Warning and cylinder is not new, cylinder may have to be replaced soon.)

 Other warnings or Faults shown in display? No  Yes 

(See Troubleshooting Chapter for actions to address warnings and faults if present)

Replace Cylinder

 Cylinder drained. 
 Disconnect open, On/Off switch to Off, water shut off valve closed, door removed. 
 Cylinder removed 
 Drain valve removed / cleaned / new O-Ring 
 Drain valve installed / ground wire attached. 

 New Cylinder Installed and hose clamps tight (12 in-lbs for 7/8” steam hose and 16 in-lbs

for 1 ¾” steam hose).  New cylinder model #

(Should be same as removed cylinder)

 Cylinder plug colors match cylinder dots. 
 Cylinder plugs snug and in good condition. 
 High Water Sensor plug snug and in good condition. 
 Electrical wiring not loose and in good condition. 
 Steam hoses and steam lines in good condition / No kinks in hose. 
 No Signs of water leaking around humidifier, steam line, condensate returns. 
 Door replaced, water shut off valve opened, On/Off switch to On, Disconnect Closed. 
 “Reset Cylinder” in Software, (press cylinder status, Password 0335). 

Inspected by: Date of inspection: _______/_______/______

Company:

69 | Maintenance and Servicing

Troubleshooting

71 Organization of Troubleshooting Chapter

71 Troubleshooting Requirements

72 General Troubleshooting

72 Humidifier

73 Steam Distributors

74 SAM-e

74 Blower Pack

74 Digital Humidistat

75 NH-EL Warnings and Faults

75 Warnings

75 Faults

75 Clearing a Fault

81 NH-EL Wiring Diagram (Cylinder A)
82 NH-EL Wiring Diagram (Cylinder B)

Troubleshooting | 70

CAUTION: Be aware, when troubleshooting, that the humidifier is powered by high voltage.

NOTE: Most humidifier faults are not caused by faulty equipment but rather by improper

Organization of Troubleshooting Chapter

The troubleshooting chapter is broken down into 2 sections.

General Troubleshooting Deals with troubleshooting incorrect humidifier operation,

steam line and plumbing issues without any control
software warnings or faults.

Humidifier Warnings and Faults Deals with warning and error messages that are generated

by the humidifier’s control software.

Troubleshooting Requirements

 Ensure the installation meets the installation requirements outlined in the Installation

Chapter of this manual.

 Familiarize yourself with the operation of the humidifier by reading the Operation Chapter of

this manual.

 Wiring diagram specific for your humidifier is installed on the inside of the humidifier door. A

generic copy of the NH-EL wiring diagram is also included at the end of this chapter for
reference purposes.

 When contacting your local representative or NORTEC for troubleshooting assistance, please

ensure the serial number has been obtained for reference purposes.

Familiarity with both good practices and wiring of the humidifier is recommended. Any
troubleshooting that requires opening the cabinet should be done by qualified personnel.

installation. A complete fault diagnosis always involves a thorough examination of the
entire system. Often, the steam hose connection has not been properly executed, or the
fault lies with the humidity control system.

71 | Troubleshooting

Symptom

Cause

Corrective Action(s)

Nothing happens when
On/Off switch is turned On.

1 Fuse blown

1 Check inline fuse in yellow housing

between transformer and driver board.
Check and replace fuses (F2 and F3) on
driver board.

2 Incorrect or no Voltage

2a Check voltage against spec label and

correct.

2b Check disconnect and ensure humidifier

is getting power.

3 Step Down Transformer not

outputting 24VAC

3a Replace the transformer.

3b Verify primary wiring.

4 Door interlock switch open

4a Replace the door

4b Pull door interlock switch out to

override.

Caution! The electrical and plumbing
compartment contains high voltage
components and wiring.

Humidifier will not humidify
or not reaching RH setpoint

1 Security loop open

1a Check if “Security loop”: “Security loop”

is displayed on the humidifier’s display.

1b Check if there is 24 VAC at terminal 2.

1c Check wiring and operation of On/Off

devices connected to terminal 1 and 2.
Ensure they are closing when they should
be.

2 High limit limiting output

2 Check if the high limit is installed too

close to the humidifier, and if it is
operating correctly.

3 No signal on Channel 1

3 Check voltage between terminal 3 and 4.

For demand configuration 27% of full
scale signal must be present for
humidifier to start. For transducer
configuration the signal must be lower
than setpoint for the humidifier to start.

4 No signal on Channel 2

(For units configured for dual
channel operation).

4 Check voltage between terminal 5 and 3.

For demand configuration 27% of full
scale signal must be present for
humidifier to operate. For transducer
configuration the signal must be lower
than setpoint for the humidifier to start.

General Troubleshooting

The following section provides general guidelines for troubleshooting the NH-EL humidifier and
auxiliary components. For detailed troubleshooting information refer to the manuals that were
provided with the auxiliary equipment and to Table 11: Troubleshooting Warnings and Faults
later in this chapter.

Humidifier

Table 10: General Troubleshooting

Troubleshooting | 72

Symptom

Cause

Corrective Action(s)

5 Capacity has been manually

limited

5 Check Manual Capacity on status
screens. Adjust “Manual Capacity (A/B)”

under “0335” / ”Configuration” /
”Features” / if necessary.

6 Low conductivity water

6 Check if “Max Level”: “Max Level” is

displayed on the humidifier’s display. If

operated on low conductivity water it may
take several hours for the NH-EL to reach
full output capacity. This is normal.
During this time the humidifier will not
perform any drains and the conductivity
of the water in the cylinder will increase.

Humidifier has faulted or
has a warning

1 Software has detected an

abnormal condition

1 Refer to Table 11: Troubleshooting

Warnings and Faults.

Symptom

Cause

Corrective Action(s)

Distributor spitting out water

1 Distributor not level

1 Use support at end of distributor to

ensure it is level.

2 “P” Trap too close to distributor

2 “P” Trap must be a minimum of 12 in

(30 cm) below the distributor to
ensure flow. Relocate if required.

3 Condensate line not sloped

sufficiently

3 Sufficient slope to ensure flow is

required. Reinstall if required.

4 Trap blocked

4 Check that water flows through trap.

Clear out if blocked.

5 Condensate line double trapped

5 Condensate lines must not have two

traps in sequence. This can cause an
air lock and prevent water draining.

6 Steam line not insulated

6 If steam line is long, condensate build

up could overload distributor
condensate port. Insulate line to
improve efficiency and install
additional condensate traps as
required.

Condensation in duct

1 Installation clearances not

observed

1 Refer to distributor installation manual

for required clearances. Relocate
distributor if required.

2 Design conditions changed

2 Check supply air temperature and

humidity to determine if conditions
have changed.

3 High limit not functioning

3 Check setting and operation of high

limit. Replace if defective.

4 Air proving not installed or not

working

4 Check that the humidifier will only

operate when there is air moving in
the duct.

5 Improper location of high limit

5 Check that high limit is installed where

it can detect high duct humidity.

Steam Distributors

73 | Troubleshooting

Symptom

Cause

Corrective Action(s)

SAM-e spitting out water

1 “P” Trap too close to SAM-e

1 “P” trap must be at least 12 in (30

cm) below header. Relocate if
required.

2 Condensate line not sloped

sufficiently

2 Ensure line is sloped sufficiently to

carry condensate produced.

3 Steam line not insulated

3 If steam line is long condensate build

up could overload the SAM-e
condensate port. Insulate the steam
line to improve efficiency and install
condensate traps as required.

SAM-e Grommet leaks

1 Distributor tubes not seated

properly

1 Push distributor tubes down until

support washer is resting on rubber
grommet.

2 Grommet Damaged

2 Replace any damaged grommets

Symptom

Cause

Corrective Action(s)

Blower not operating

Note: Blower pack does not
come on unless steam is
being produced by the
humidifier.

1 No power to blower pack

1a Check power connection.

1b Check blower pack fuses

2 On/Off Thermostat not closing

2 Check wiring to thermostat replace if

it does not close when it is exposed to
steam.

Symptom

Cause

Corrective Action(s)

Humidistat Reading incorrectly

1 Sensor out of calibration

1 See humidistat manual.

2 Improper sensor location

2 Check that the humidistat is

positioned in a location
representative of room humidity.

3 Exposed to draft or heat source

3 Check that heat/cold fluctuations,

drafts, sunlight, doors, or vents are
affecting the reading.

4 No vapour barrier

4 Ensure drafts cannot affect reading

by ensuing vapour barrier is in place
and working.

SAM-e

Blower Pack

Digital Humidistat

Troubleshooting | 74

Press on Warning

to get list of warnings/

faults.

Press on any item

in the list to get

detailed info about it.

NH-EL Warnings and Faults

The self-diagnostic system built into the NH-EL is continually monitoring the operation of the
humidifier. When the display shows a warning or fault condition you can find out more
information about the fault by pressing on the warning/fault box. This will display a screen
listing any warnings/faults that are in effect. Pressing on any item in the list will provide a
description as well as causes and possible corrective actions.

Figure 51: Displaying Warning / Fault Information

Warnings

 When problem symptoms are detected, the NH-EL will attempt to take self-corrective actions

to try to correct the problem. A warning is displayed on the screen for information purposes
and the humidifier continues to operate.

 If the condition which generated the warning is eliminated the warning is cleared from the

display.

 While a warning is displayed the status LED is Yellow.

Faults

 If the humidifier is not able to self-correct a problem symptom it will, if necessary, respond

by shutting down.

 When this occurs, the humidifier illuminates the red “Fault” LED, shuts off power to the

cylinder, and drains the cylinder.

Clearing a Fault

 Check the fault message that the humidifier is displaying and take any necessary actions to

correct the cause(s) as outlined in Table 11: Troubleshooting Warnings and Faults.

 Power cycle the humidifier with the On/Off switch waiting 3 seconds between turning it off

and on.

75 | Troubleshooting

Display Message

LED

System

Detected

Cause

Corrective Action(s)

BMS

BACnet

Nortec Online

Staged
Modulation

Warning/Fault

Red

No Modbus/
BACnet / Nortec
Online / Multi
Mode signal

1 Loose connection

1 Check connections and

polarity of wires.

2 Incorrect

Modbus/BACnet/IP
address or
configuration.

2 Check that address of

humidifier matches that
of network.

3 Humidifier configured

but not connected to
network

3 Configure controls

correctly in “Control
Setting” level of

software (see Operation
Chapter).

4 Improper wire used

4 Use 120 Ohm

impedance shielded
twisted pair cable for
Modbus, Cat 5 for
BACnet IP/ IP.

5 Noise preventing

humidifier from
detecting signal.

5 Eliminate source of

noise causing
interference.

Control Signal
Warning / Fault

No signal from
RH control
sensor

No signal from
RH Limit sensor

1 Sensor not powered

1 Use multimeter to

check that sensor is
powered.

2 Sensor not wired

correctly

2 Check wiring is secure

and wired correctly per
instructions in
installation chapter.

3 Defective sensor

3 Check if sensor output

is corresponding to RH.
If not replace the
sensor.

Red

4 RH less than 5%

4 RH less than 5% are

interpreted as a broken
sensor. Contact
NORTEC Representative
for recommendation.

Red

5 Humidifier control

configuration incorrect

5 Check that the

humidifier control
configuration matches
the installed sensor
output.

Current Off Fault

Red

Current detected
with no demand

1 Contactor seized closed

1 Open Disconnect, check

if contactor is closed

2 Driver Board out of

Calibration

2 If display indicates

output with contactor
open, then replace the
driver board.

Table 11: Troubleshooting Warnings and Faults

Troubleshooting | 76

Display Message

LED

System

Detected

Cause

Corrective Action(s)

Cylinder Spent

Yel

Red

Electrodes
covered with
scale.

1 Cylinder electrodes are

covered with scale and
humidifier cannot meet
demand

1 Replace cylinder with

same model number
(see maintenance
chapter)

Excess Current
Warning/Fault

Yel

Current has
exceeded 130%
of max Full Load
Amps

5 Water supply too

conductive

5a Contact Nortec

representative for
recommendation on
alternate cylinder

5b Change the water

supply

Red

6 Wrong cylinder installed

6 Install correct cylinder

model

7 Cylinder Spent but not

detected by software

7 Replace the cylinder

(see maintenance
chapter)

Fill Timeout
Warning / Fault

Fill valve
activated for long
time, but high
water level not
reached.

Water level in
cylinder should
rise faster than
1” per minute.

1 Drain valve leaking or

stuck open

1 Clean drain valve or

replace (see
maintenance chapter)

2 Water shut off valve

closed

2 Open shut off valve

3 Fill Valve strainer

blocked

3 Clean out strainer on fill

valve inlet.

Red

4 High system back

pressure

4a Check for kinked hose

4b Check for proper

condensate removal
(see installation
chapter)

4c Install fill cup

extension

5 Air flow into cylinder

through steam line

5 Disconnect steam line,

let cylinder fill part way,
then reconnect steam
line.

Foaming Cylinder
Warning / Fault

Red

Foam inside the
cylinder.

1 Back pressure

restricting water from
entering cylinder

1a Check for restrictions

and proper condensate
removal in steam line.

1b If water is going down

drain during fill cycle
then install fill cup
extension kit.

2 Organic material in

water

2 Install filter to remove

organic material

3 Drain blocked water

over concentrated

3 Clean the drain line

77 | Troubleshooting

Display Message

LED

System

Detected

Cause

Corrective Action(s)

Foaming Cylinder
Warning / Fault

Red

4 Humidifier short cycling

4 Observe operation to

ensure humidifier can
normally run long
enough to perform a
drain. If not turn on the
Short Cycle feature on
page 56.

Low Conductivity
Warning

Low water
conductivity

1 Drain valve leaking

1 Clean drain valve or

replace (see
maintenance chapter)

2 Back pressure causing

some fill water to go
down drain

2a Check for restrictions

and proper condensate
removal in steam line.

2b If water is going down

drain during fill cycle
then install fill cup
extension kit.

3 Wrong Cylinder Installed

3 Install cylinder of same

model number as was
previously installed

4 Newly installed cylinder

not reaching demand
for extended time due
to Low water
conductivity

4a Add 1/4 teaspoon of

salt to fill cup.

4b Adjust drain factor to

0.7 in User Defined
Settings (see operation
chapter)

4c Turn on the Low

Conductivity feature on
page 56.

Max Level Warning

Water level at
top of cylinder or
foaming

1 Humidifier has filled to

top of cylinder without
reaching demand

1 None, for information

only, it is normal for a
new cylinder to reach
max level before water
in cylinder is
concentrated and for an
old cylinder to reach
max level near the end
of cylinder life.

1b If the cylinder is new,

add ¼ teaspoon of salt
to fill cup to assist
cylinder in
concentrating.

1c Supply water

conductivity too low (DI
or RO). Change to
potable water supply
with conductivity above
150 µS/cm.

Troubleshooting | 78

Display Message

LED

System

Detected

Cause

Corrective Action(s)

2 Water foaming

2 Check if water level is at

top of cylinder. If water
is not at top there may
be foam in the cylinder.
Consider the Foam
Mode feature on page

55.

No Current Fault

Red

Water level at
top of cylinder
with no current
1 Current transformer

loose on driver board

1 Open disconnect,

ensure current
transformer spade
connectors are secure.
Squeeze with pliers if
loose.

2 Primary wire not looped

through current
transformer.

2 Open disconnect, rewire

primary wire through
current transformer.

3 High water sensor plug

is on an electrode pin.

3 Install high water sensor

plug on cylinder pin with
shroud around it.

Remote Disabled
Warning

Network
shutdown
message

1 Network signal received

by humidifier to shut
down.

1 Normal operation for

humidifier on network
control. Contact network
administrator to enable
humidifier.

RH High Warning

RH higher than
high RH setpoint

1 Setpoint higher than RH

alarm setting

1 If the humidifier is still

operating then check
and adjust setpoints.

RH Low Warning

RH Lower than
low RH setpoint

1 Humidifier not running

1 Check why humidifier is

not running and put it
into operation.

2 Setpoint lower than RH

low alarm setting

2 Check and adjust

setpoints.

Safety Loop Open

Grn
Blink

Security loop
open (terminal 1
and 2)

1 On/Off device

connected to security
loop is open

1a Normal operation, no

action required

1b Wrong setpoint, A/P

not sensing air
movement

2 Loose wire

2 Check wiring to all

On/Off devices
connected to terminals
1 and 2.

SIM Card Fault

Red

Controller cannot
detect a valid
SIM card

1 Improper SIM card

installation or missing

1 Check that SIM card is

installed and socket
closed.

2 Incorrect SIM card

2 Check that the SIM card

serial number matches
the humidifier’s.

79 | Troubleshooting

Display Message

LED

System

Detected

Cause

Corrective Action(s)

Staged
Modulation
Warning

Red

Slave unit not
communicating
with Master Unit.

1 Master unit not

configured correctly

1 Check configuration of

master as outlined in
Multi Mode
Configuration

2 Slave unit not

configured correctly

2 Check configuration of

slave as outlined in
Multi Mode
Configuration

3 Wiring to master unit

disconnected

3 Check that wire

connected to J10 of
Master and Slave and
that polarity is not
reversed

4 Incorrect wire type used

4 Use 18-24 AWG multi-

strand, twisted pair,
shielded cable

Unstable Control
Warning

Demand
swinging from
low to high
rapidly

1 Improper Proportional

and Integral settings in
control

1 Adjust proportional and

integral settings to
reduce swings in
demand signal.

2 Control humidistat

installed too close to
diffuser or doorway to
un-humidified space

2 Install humidistat so

that it senses air
representative of space
being humidified.

3 Defective control

3 Replace defective

control

Troubleshooting | 80

NH-EL Wiring Diagram (Cylinder A)

Built On

Blower Pack

Primary Power

External

Cylinder

B

Diagram

(2569829)

Internal

A

B

C

D

{

E

F

L1

L2L3

Fuse 1 Amp
(if Required)

S

S

Transformer
(if required)

PRI

120V

S

S

Fuse 1.5 A
(if required)

Circuit for Cylinder A

Blower Pack

Air Proving

Security

1 2

Loop

3

B

(-) Signals

4

br

(+) Control Signal

GND

+ 10 Vdc

(+) Limit Signal

+

5

7

6

bl

B

RR

N.O.

8 9

G

OPTIONAL

Fault Remote PCB

NC

NC

NO

NO

COM

COM

Steam

Service

Unit ON

W

NO

NO

COM

COM

Error

Optional Fuses

Contactor

Contactor

Fill V

Drain V

Fill V

Optional for

drain water

cooling

or

or

W

or

or

R

B

R

B

G

PRI

SEC

CONTACTOR

RR

INLET

S

W

BB

W

DRAIN

3.0 A (005-100)

4.0 A (150-200)

Door Interlock

Switch

Cyl. B

Cyl. A

G

R

B

Aux. Drain

LEV. SENSOR

SL

24

SL

24

24Vac

POWER SUPPLY

GND

ON/OFF

Switch

3

1

Switch

4

R

R

2

For cylinder A identification

DIP switch 1 and 2 must be

in the OFF position

ONON

J3

J2

J1

J6

Master/Slave

J10

R

B

R

B

Port

J12

J14

J15

J16

Cylinder

2,3, and 6 electrode

F1

CURRENT SENS

IN

24V

BLOWER

GND

LIMIT

IN

GND

IN

10V

. ..

CONTROL

V+

W

G

B

bl

br

R

High
Water
Plug

NH-EL SERIES HUMIDIFIER (Cylinder A)

WIRING DIAGRAM
DIAGRAM No. 2569828 REV. E Date: July 4, 2014.

Figure 52: Wiring Diagram for NH-EL (Cylinder A)

J19

J23

U

J21

U

U

U

NH-EL Wiring Diagram (Cylinder B)

External

Internal

Circuit for Cylinder B

Blower Pack

Air Proving

Security

1 2

R

Loop

B

(-) Signals

3

B

(+) Control Signal

4

br

+ 10 Vdc

(+) Limit Signal

+

GND

5

7

6

bl

B

R

N.O.

8 9

G

W

External

Internal

A

B

C

D

E

F

}

Cylinder

A

Diagram

(2569829)

Optional Fuses

Cylinder

2,3, and 6 electrode

Contactor

Contactor

Fill V

Drain V

Fill V

Optional for

drain water

cooling

High
Water
Plug

R

B

R

B

W

G

For cylinder B identification

DIP switch 1 and 2 must be

W

in the ON position

ONON

or

or

BB

RR

W

Contactor Inlet Drain

F1

G

Current Sens

LEV

. SENSOR

SL

24

SL

B
R

24

24Vac

R

POWER SUPPLY

B

GND

IN

W

G

24V

BLOWER

GND

LIMIT

10V

. ..

CONTROL

B

bl

IN

GND

IN

br

V+

R

NH-EL SERIES HUMIDIFIER (Cylinder B)

WIRING DIAGRAM
DIAGRAM No. 2569829 REV. D Date: Jul 4, 2014

Figure 53: Wiring Diagram for NH-EL (Cylinder B)

Spare Parts

84 NH-EL Plumbing Parts
88 NH-EL Electrical Parts
92 Blower Pack Parts
95 Warranty

Part Ordering

 The following illustrations and tables list the most commonly used NH-EL parts.
 First locate the part you require in the illustration corresponding to your NH-EL unit.
 Find the item number in the first column of the table adjacent to the illustration.
 Read across the table to the column which corresponds to the number of phases, voltage

and capacity of your unit.

 To order parts, or help in identifying the part you need, contact your local Nortec agent.

83 | Spare Parts

NH-EL Plumbing Parts

Figure 54: NH-EL Plumbing Parts

Spare Parts| 84

MODEL 5

Volts/Ph
NORTEC
PART NO.

110-120

208/1

220-240/1

277/1

380/1

440-480/1

550-600/1

208/1

220-240/1

277/1

380/1

440-481/1

550-600/1

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

CYLINDER 202

1519002 1 1 1 1

CYLINDER 203

1519003 1

CYLINDER 204

1519004 1 1

CYLINDER 321

1519020 1 1 1

CYLINDER 305

1519025 1

CYLINDER 309

1519029 1 1

CYLINDER 311

1519031 1 1 1

CYLINDER 303

1519023 1 1

CYLINDER 421

1519040 1 1

CYLINDER 407

1519047 1 1

CYLINDER 411

1519051 1 1

2

DRAIN CHANNEL

2573514 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

3

VALVE DRAIN + 24V COIL

1456000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

4

FILL CUP ASSEMBLY, SM

2574143 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

5

SMALL STEAM LINE 0.875
IN. ID IN.

2574131 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12

VALVE, SINGLE FILL, 0.5
L/min

2573515 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

VALVE, SINGLE FILL, 1.2
L/min

2573522 1 1 1 1 1

VALVE, DUAL FILL, 3.3
L/min, 0.5 L/min

2574133 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

VALVE, DUAL FILL, 3.3
L/min, 1.2 L/min

2574134 1 1 1 1 1

7

FITTING BRASS 3/4 BSP /
WASHER = 1/2" NPT

2574137 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

8

CABLE TIE REUSABLE 1­400 CYL SZ X2

2574138 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

CYLINDER PLUG KIT, QTY 2

2577737 1 1 1 1 1 1 1 1 1 1 1 1

SUPER PLUG KIT, R-B, NH­EL

2574140 1

CYLINDER PLUG KIT, QTY 3

2573529 1 1 1 1 1 1 1 1 1 1

10

HIGH WATER SENSOR
PLUG

2577738 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

OPTIONAL COMPONENTS

FOAM DETECTION OPTION

FOAM DETECTION KIT
SMALL

2574091 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

-WITH BUILT ON BLOWER
PACK

2574093 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

FILL CUP EXTENSION

FILL CUP EXTENSION KIT

2574073 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

DRAIN WATER COOLING

3.3 L/min, 0.5 L/min

2574079 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

3.3 L/min, 1.2 L/min

2574081 1 1 1 1 1

*Optional Components
N/S - Not Shown

1

6

6*

9

Not Shown Optional

Components

ITEM

NO.

DESCRIPTION

SINGLE PHASE

THREE PHASE

102020

30

Table 12: NH-EL 005-30 Plumbing Parts List

85 | Spare Parts

Figure 55: NH-EL Plumbing Parts

NH-EL Plumbing Parts

Spare Parts| 86

Table 13: NH-EL 050-200 Plumbing Parts List

MODEL

Volts/Ph
NORTEC
PART NO.

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

CYLINDER 621

1519080 1 1 1 1 1 1 2 2 2 2

CYLINDER 605

1519085 1 1 1 1 1 1 2 2 2 2

CYLINDER 603

1519083 1 1

2

DRAIN CHANNEL

2573514 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

3

VALVE DRAIN + 24V
COIL

1456000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

4

FILL CUP
ASSEMBLY LARGE

2574142 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

5

LARGE STEAM LINE

1.750 IN. ID IN.

2574132 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 24 24 24 24 24 24 24 24 24 24

VALVE, SINGLE
FILL, 2.0 L/min

2573523 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2

VALVE, SINGLE
FILL, 3.3L/min

2573524 1 1 1 1 1 2 2 2 2 2

VALVE, DUAL FILL,

3.3 L/min, 2.0 L/min

2574135 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2

VALVE, DUAL FILL,

3.3 L/min, 3.3L/min

2574136 1 1 1 1 1 2 2 2 2 2

7

FITTING BRASS 3/4
BSP / WASHER ­1/2" NPT

2574137 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

8

CABLE TIE
REUSABLE 5-600
CYL SZ X2

2574139 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

CYLINDER PLUG
KIT, QTY 3

2573529 2 2 2 2 2 2 2 2 2 4 4 4 4

SUPER PLUG KIT, R­Y-B, NH-EL

2574141 2

2

2 2 2 2 4 4 4 4 4 4

10

HIGH WATER
SENSOR PLUG

2577738 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

OPTIONAL COMPONENTS

FOAM DETECTION

FOAM DETECTION
KIT MEDIUM

2574095 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

FOAM DETECTION
KIT LARGE

2574099 1 1 1 1 1 1 1 1 1 1

FILL CUP
EXTENSION

FILLCUP
EXTENSION KIT
NHTC/NHPC

2574073 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

DRAIN WATER
COOLING

3.3 L/min, 2.0 L/min

2574083 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2

3.3 L/min, 3.3L/min

2574085 1 1 1 1 1 2 2 2 2 2

*Optional Components
N/S - Not Shown
** For far tank on double units

DESCRIPTION

THREE PHASE

5075100

150

200

1

6

6*

9

Not Shown Optional Components

ITEM

NO.

87 | Spare Parts

NH-EL Electrical Parts

Figure 56: NH-EL Electrical Parts

Spare Parts| 88

Table 14: NH-EL 005-030 Electrical Parts List

MODEL 5

Volts/Ph
NORTEC
PART NO.

110-120

208/1

220-240/1

277/1

380/1

440-480/1

550-600/1

208/1

220-240/1

277/1

380/1

440-481/1

550-600/1

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

CONTACTOR 30 AMP 1PH

2574148 1 1 1 1 1 1 1 1 1 1

CONTACTOR 30 AMP 3PH

2574149 1 1 1 1 1 1 1 1

CONTACTOR 40 AMP 3PH

2574150 1 1 1 1

CONTACTOR 50 AMP 3PH

2574151 1

TERMINAL BLOCK 2 POLE
95A

2574153 1 1 1 1 1 1 1 1 1 1 1 1 1

TERMINAL BLOCK 3 POLE 95
AMP

2574154 1 1 1 1 1 1 1 1 1 1

3

GROUND CLAMP (SMALL)

2574158 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

TRANSFORMER 120/24 VAC
75 VA

2574159 1

TRANSFORMER 208 24V
75VA

2574160 1 1 1 1

TRANSFORMER 240/24 VAC
75 VA

2574161 1 1 1 1

TRANSFORMER 277/24V
75VA

2574162 1 1

TRANSFORMER 380/24V
75VA

2574163 1 1 1 1

TRANSFORMER 480/24 VAC
75 VA

2574164 1 1 1 1

TRANSFORMER 600/24 VAC
75 VA

2574165 1 1 1 1

5

PCB FAULT REMOTE
(OPTIONAL)

2574171 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

IC ASSEMBLY, NH-EL + SIM

2576572 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

IC ASSEMBLY, NH-EL

2570436 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

7

DRIVER BOARD, NH-EL

2570437 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

8

SWITCH, PUSH ON/OFF

2569654 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

9

SWITCH SPST 208-240V

1473010 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

10

SWITCH INTERLOCK IDM 423 1323091 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

FUSE 3 AMP 2523523

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

CABLE, RIBBON 10 PIN, NH­EL DRIVER BOARD

2574173 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

CABLE RIBBON 10 PIN NHTC
FAULT

2574174 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

TRANSFORMER 208, 240V
TO 120V 150 VA

2571460 1 1 1 1 1 1 1 1

TRANSFORMER 277, 380V
TO 120V 150VA

2571461 1 1 1 1 1 1

TRANSFORMER 480, 600V
TO 120V 150 VA

2571462 1 1 1 1 1 1 1 1

PRIMARY FUSE JJN50
(JLLN50)

1509692 2

PRIMARY FUSE JJN40
(JLLN40)

1423173 2 2 2 2 2 2 3 3 3 3
PRIMARY FUSE JJS40
(JLLS40)

1423160 2 2 2 2 2 2 3 3 3 3 3 3

ITEM

NO.

DESCRIPTION

SINGLE PHASE

THREE PHASE

102020

30

OPTIONAL

COMPONENTS

1

2

4

6

NOT SHOWN

NOT SHOWN,

SPACE MODELS

ONLY

89 | Spare Parts

NH-EL Electrical Parts

Figure 57: NH-EL Electrical Parts

Spare Parts| 90

MODEL

Volts/Ph
NORTEC
PART NO.

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

208/3

220-240/3

380/3

440-480/3

550-600/3

CONTACTOR 30 AMP 3PH

2574149 2 2 1 1 2 2 4 4

CONTACTOR 40 AMP 3PH

2574150 2 1 2 2 4

CONTACTOR 50 AMP 3PH

2574151 2 2 1 1 4 4 2 2

CONTACTOR 62 AMP 3PH

2574152 2 2 1 4 4

TERMINAL BLOCK 3 POLE 95 AMP

2574154 1 1 1 1 1 1 1 1 1 1 1 1 1 1

TERMINAL BLOCK 3 POLE 150 AMP

2574155 1 1 1 1 1 1 1 1

TERM. BLOCK 3 POLE 310 AMP

2574156 1 1 1

GROUND CLAMP (SMALL)

2574158 1 1 1 1 1 1 1 1 1

GROUND CLAMP (LARGE)

2574370 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

TRANSFORMER 208 24V 75VA

2574160 1 1 1

TRANSFORMER 240/24 VAC 75 VA

2574161 1 1 1

TRANSFORMER 380/24V 75VA

2574163 1 1 1

TRANSFORMER 480/24 VAC 75 VA

2574164 1 1 1

TRANSFORMER 600/24 VAC 75 VA

2574165 1 1 1

TX 24VAC 150VA, PRIMARY 208

2574166 1 1

TX 24VAC 150VA, PRIMARY 240

2574167 1 1

TX 24VAC 150VA, PRIMARY 480

2574168 1 1

TX 24VAC 150VA, PRIMARY 600

2574169 1 1

TX 24VAC 150VA, PRIMARY 380

2574170 1 1

5

PCB FAULT REMOTE (OPTIONAL)

2574171 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

IC ASSEMBLY, NH-EL + SIM

2576572 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

IC ASSEMBLY, NH-EL

2570436 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

7

DRIVER BOARD, NH-EL

2570437 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

8

SWITCH, PUSH ON/OFF

2569654 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

9

SWITCH SPST 208-240V

1473010 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

10

SWITCH INTERLOCK IDM 423

1323091 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

FUSE 3 AMP 2523523

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

FUSE 4 AMP 2559659

1 1 1 1 1 1 1 1 1 1

CABLE, RIBBON 10 PIN, NH-EL DRIVER
BOARD

2574173 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

CABLE RIBBON 10 PIN NHTC FAULT

2574174 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2

TRANSFORMER 208, 240V TO 120V
150 VA

2571460 1 1 1 1 1 1

TRANSFORMER 277, 380V TO 120V
150VA

2571461 1 1 1

TRANSFORMER 480, 600V TO 120V
150VA

2571462 1 1 1 1 1 1

PRIMARY FUSE JJN60 (JLLN60)

1423176

6 6 12 12

PRIMARY FUSE JJN50 (JLLN50)

1509692

6 6 12 12

PRIMARY FUSE JJN40 JLLN40

1423173

6 6

PRIMARY FUSE JJS40 (JLLS40)

1423160

6 3 3 6 3 6 6 12 6 12 12

PRIMARY FUSE JJS50 (JLLS50)

1509693

3 3 6 6

ITEM

NO.

DESCRIPTION

THREE PHASE

5075100

150

200

OPTIONAL

COMPONENTS

1
2
3

4

NOT SHOWN

NOT SHOWN,

SPACE MODELS

ONLY

6

Table 14: NH-EL 050-200 Electrical Parts

91 | Spare Parts

Figure 1: Blower Pack Parts

Figure 58: Blower Pack Parts

Blower Pack Parts

Spare Parts| 92

Item Description Part Number QTY

1 Distributor Assembly 2573805 1
2 Diffuser Assembly 2573806 1
3 Switch Assembly 2573807 1
4 Thermostat Assembly 2573808 1
5 Relay Assembly 2573809 1
6 Capacitor 8uF (fastening nut included) 2573810 1
7 Capacitor, 20uF (fastening nut included) 2573811 1
8 Fan Assembly 2573812 1
9 Spare fastener kit (included low voltage connector) 2573813 1

10 Power Cable (Connector and Cable together) 2573814 1

Table 15: Blower Pack Parts List

93 | Spare Parts

This Page Intentionally Left Blank

Spare Parts| 94

Warranty

Nortec Humidity Inc. and/or Nortec Humidity Ltd. (hereinafter collectively referred to as THE
COMPANY), warrant for a period of two years after installation or 30 months from

manufacturer’s ship date, whichever date is earlier, that THE COMPANY’s manufactured and

assembled products, not otherwise expressly warranted (with the exception of the cylinder), are
free from defects in material and workmanship. No warranty is made against corrosion,
deterioration, or suitability of substituted materials used as a result of compliance with
government regulations.

THE COMPANY’s obligations and liabilities under this warranty are limited to furnishing
replacement parts to the customer, F.O.B. THE COMPANY’s factory, providing the defective

part(s) is returned freight prepaid by the customer. Parts used for repairs are warranted for the
balance of the term of the warranty on the original humidifier or 90 days, whichever is longer.

The warranties set forth herein are in lieu of all other warranties expressed or implied by law. No
liability whatsoever shall be attached to THE COMPANY until said products have been paid for in
full and then said liability shall be limited to the original purchase price for the product. Any
further warranty must be in writing, signed by an officer of THE COMPANY.

THE COMPANY’s limited warranty on accessories, not of the companies manufacture, such as

controls, humidistats, pumps, etc. is limited to the warranty of the original equipment
manufacturer from date of original shipment of humidifier.

THE COMPANY makes no warranty and assumes no liability unless the equipment is installed in
strict accordance with a copy of the catalog and installation manual in effect at the date of
purchase and by a contractor approved by THE COMPANY to install such equipment.

THE COMPANY makes no warranty and assumes no liability whatsoever for consequential
damage or damage resulting directly from misapplication, incorrect sizing or lack of proper
maintenance of the equipment.

THE COMPANY makes no warranty and assumes no liability whatsoever for damage resulting
from freezing of the humidifier, supply lines, drain lines, or steam distribution systems.

THE COMPANY retains the right to change the design, specification and performance criteria of
its products without notice or obligation.

95 | Warranty

U.S.A.

826 Proctor Avenue
Ogdensburg, NY 13669

CANADA

2740 Fenton Road
Ottawa, Ontario K1T 3T7

TEL: 1.866.NORTEC1
FAX: [phone]

EMAIL: [e-mail]
WEBSITE: www.humidity.com