Condair SE Series Engineering User manual

Nortec

SE

Series

Engineering

Manual

Includes technical specifications,

guidelines, and options for selection

and application of SETC B+ / SEP

Steam Exchange humidifiers

2553855-C | 26/11/2018

Your guide to selecting and specifying Nortec Steam Exchange Humidifiers!

Thank you for choosing Condair.

Proprietary Notice

This document and the information disclosed herein are proprietary data of Condair LTD. Neither this

document nor the information contained herein shall be reproduced used, or disclosed to others without the

written authorization of Condair LTD., except to the extent required for installation or maintenance of

recipient’s equipment. All references to the Condair name should be taken as referring to Condair LTD.

Liability Notice

Condair 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 Condair.

Copyright Notice

Contents

1 Introduction

1 How the Humidifier Works

3 Nortec Nortec SE Humidifier

Models

5 Nortec Nortec SETC and the

Nortec SEP

6 Nortec Nortec SE Humidifier

Features

7 Nortec Nortec SE Humidifier

Components

9 Nortec Nortec SE Outdoor

Components

13 Specifying the

Nortec SE

14 Humidifier Specification Checklist

15 Humidifier Load

17 Supply Steam Pressure

18 Humidifier Controls

19 Steam Distribution Method

19 Nortec SE Series Options and

Accessories

24 Sample Specification

29 Nortec SE Installation

Requirements

30 Location

35 Plumbing

38 Boiler Steam and Boiler

Condensate Return

40 Electrical

41 Steam Distribution

42 Steam Lines and Condensate

Returns

46 Nortec Nortec SETC/P Controls

47 CondairControls

52 Staged Modulation (Nortec SETC

Only)

53 Condair Online (Nortec SETC Only)

53 Links 2 (Nortec SETC Only)

56 Warranty

1 | The Nortec SETC/P

The Nortec SETC/P Steam Exchange Humidifier

The Nortec SETC/P is an atmospheric steam generator designed for air humidification via steam

distributor, blower pack, or steam manifold (SAM-e). The Nortec SETC/P uses pressurized steam

from a boiler fed into a heat exchanger submerged in potable, RO, or DI water to generate heat

and steam.

The main applications of Nortec SE series humidifiers is humidification of buildings which have

a high pressure boiler which can also be used for heating or other industrial processes. Nortec

SE humidifiers take the steam produced by the boiler which contains anti-scaling chemicals and

converts it into clean and pure steam for humidification.

How the Humidifier Works

Figure 1: Humidifier Schematic

Steam Generation

 After initial start-up and tank filling the humidifier will sit in standby mode, awaiting a call for

humidity.

Steam Line

Steam Distributor

‘P’ Trap

Dual Fill Valve

Fill Box

Float Chamber

‘P’ Trap /

Overflow

Vacuum Break

Drain Pump

Auxiliary Drain

CV Valve

CV Valve Actuator

Steam Trap

Condensate

Return to

Boiler

Drain

Outlet

Heat Exchanger

Tank

Boiler

Steam

Cooling to

Float Chamber

Lower Mixing

Box

The Nortec SETC/P | 2

 When a call is received, the humidifier will send a signal to the CV Valve actuator. The

actuator will open as required and the flow of boiler steam will begin.

 Energy from the boiler steam is transferred to the fresh water tank through a heat exchanger

inside of the unit. This causes the water to boil. Full boil from a cold tank can take up to 15

minutes. On Nortec SETC models, the Keepwarm feature can be activated to reduce boil

time.

 Once the humidifier has reached full boil, the humidifier will modulate the actuator,

controlling the flow of steam into the unit. This will allow the unit to reduce its output level

as the humidity levels in the space being humidifier are reached.

 During the boiling process minerals are left behind from the water. The unit will occasionally

activate the drain pump to flush out some of the minerals in the water and reduce the

concentration in the tank. The fill valve will also be activated periodically to replace water

that is boiled off during normal operation.

 When the demand to the unit stops, the unit will close the steam valve and steam

production will stop. The unit will enter standby mode and await a call for humidity. If

Keepwarm is activated (Nortec SETC only), the CV valve will be opened periodically to heat

the tank.

Drains

 As steam is produced minerals are left behind in the Nortec SE’s tank. The Nortec SE

performs periodic drains to reduce the amount of minerals that will precipitate as scale.

 In general more frequent drains result in less maintenance. The amount of water drained to

control mineral concentration in the tank can be configured in the Nortec SETC’s software.

 To cool drain water the Nortec SE activates the fill valve whenever the drain pump is

activated. Cool fill water flows down from the fill box and blends with hot tank water in the

lower mixing box before being drawn into the drain pump. The drain cooling feature can be

deactivated via software.

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 1: 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. For introducing steam directly into a room, remote mounted blower

packs are used. (see Steam Distribution on page 41)

Steam Line

The steam line between the tank steam outlet and the distributor may be Condair steam hose,

copper pipe, or stainless steel pipe or tube. The Nortec SETC/P is an atmospheric steam

generator so it is very important no restrictions are present in the steam line and that the steam

line is sized properly to carry the full output capacity of the humidifier. It is also important to

minimize the length of steam lines. See Table 11: Maximum Recommended Length of Steam

Line on page 44 for information on selecting steam lines and maximum recommended lengths.

Whenever steam is distributed condensate is formed in the distribution system and steam

distributor, manifold, or blower pack. Insulating steam lines is one important way to reduce the

3 | The Nortec SETC/P

amount of condensate formed. Steam lines must be sloped so that condensate does not collect

in the lines and create a restriction to steam flow.

Condensate Return

The condensate must be collected and removed from the system so that it does not build up

and leak into the duct (or room if blower pack is used). Condensate must be collected and fed

to drain. (see Figure 25: Condensate Traps on page 43)

Nortec SE Humidifier Models

Indoor Models

The Nortec SETC with its Total Controller and state-of-the-art features and options is the most

advanced steam exchange humidifier available. The base model Nortec SEP provides steady and

reliable humidification using the same proven heat exchanger technology as the Nortec SETC. The

Nortec SETC/P is available in capacities ranging from 50 lb/hr (23 kg/hr) to 1050 lb/hr (475 kg/hr).

Nortec SETC/P humidifiers are packaged in five different cabinets depending on their capacity. See

Figure 7: Nortec SE Indoor Dimensions for dimensional information.

Figure 2: Nortec SE Series Indoor Models

SETC50

SE 100-175

SE 250-375

SE 525-750

SE 1050

Note:

SE 750 has

2 steam outlets

The Nortec SETC/P | 4

Nortec SETC Outdoor Models

The Nortec SETC Series Outdoor Models are designed to be rooftop mounted on a roof curb (by

others). When properly installed the outdoor enclosure will provide protection from rain, wind, and

snow in areas with ambient temperature –40 to 104 °F (-40 to 40 °C) and relative humidity 0 -

100% (non condensing). All outdoor models include a ventilation package to prevent overheating in

warm months, and a freeze protection package to prevent freezing in cold months.

The Nortec SETC Outdoor is available in capacities ranging from 100 lb/hr (45 kg/hr) to 1050 lb/hr

(475 kg/hr). The SETC Outdoor humidifiers are packaged in four different cabinets depending on

their capacity. See

SETC Outdoor 100-175

SETC Outdoor 250-375

SETC Outdoor 525-750

SETC Outdoor 1050

Figure 3: Nortec SE Series Outdoor Models

5 | The Nortec SETC/P

Nortec SETC and the Nortec SEP

The main difference between the Nortec SETC and the Nortec SEP humidifier is in their controls

and user interface. The Nortec SETC model’s Total Controller provides a graphic LCD screen

and keypad, accepts additional control signals, optional building management system

connectivity (BACnet, Lonworks, Johnson N2, and Modbus), and optional Internet monitoring via

Condair Online. The Nortec SEP controls provide the basic functionality required for humidifier

operation. See Table 1: Nortec SETC/P Features for a listing of the two control systems

features. Figure 4 shows the differences in the Nortec SETC’s and Nortec SEP’s user interface.

Figure 4: Nortec SETC and Nortec SEP User Interfaces

The Nortec SETC LCD screen and keypad - allow easy configuration of all features of the

Nortec SETC humidifier such as blowdown rate, full tank blowdown, control signals, 3 day drain

and others. The LCD screen also provides status information indicating current status and

configuration, a graph of recent operation, service and fault messages, and troubleshooting

information. One of the key features of the Nortec SETC controller is tracking operation and

providing information about service requirements to make it easy to service and maintain the

Nortec SETC.

LCD Display and

Input Buttons

.

(Buttons used to

navigate

status screens and

configure the

humidifier,

correspond to icons

on the display)

Status LEDs

Software Drain

Button

(Initiates a software

controlled drain)

On/Off Switch

(Turns humidifier

On/Off)

ON

OFF

DRAIN

SERVICE

FAULT

DEMAND

SETC

SEP

The Nortec SETC/P | 6

Nortec SE Humidifier Features

From their integrated steam traps and enclosure’s to the Nortec SETC’s internet based monitoring

capability both the Nortec SETC and Nortec SEP include many advanced features that set them

apart from other humidifiers. The following list outlines some of the Nortec SE series key features.

Table 1: Nortec SETC/P Features

General

SETC

SEP

SETC Outdoor

High efficiency stainless steel heat exchangers

X

Internal steam trap on each heat exchanger

X

CV Valve, actuator, and wye strainer included

X

Modulating output for excellent humidity control

X

Range of capacities to match load requirements

X

50 to 10,500 lb/hr output with staged modulation.

X

Standard 120 VAC power requirement

X

C-UL-US

X

30 month warranty

X

Warranty extendable to 3 yrs with Nortec Online

X

Clean and dry atmospheric steam

X

Installation / Maintenance

Heat exchanger with flat sides for easy cleaning.

X

Wide range of water management options

X

(adjustable

blowdown)

X

Floor or optional stand mounting

X

(Curb Mount)

Choice of steam distribution (BP, Distributor, SAM-e)

X

Electronics

Graphic Display Screen with Keypad input

X

LED status indicators

X

Remote status via dry points

X

Proportional and Integral Control

X

(Proportional)

X

Internal control from humidity sensor inputs.

X

Manual Capacity Adjustment

X

On/Off operation

X

Compatible with all standard Industrial controls

X

(0/2-10 VDC)

X

Single and dual channel control

X

(Single)

X

BMS integration via Links 2 to Lonworks, BACnet,

Johnson, Modbus

Option

Nortec Online

Option

Other

Weatherproof Enclosure

X

Curb mount

X

Freeze protection valve and keep warm

X

Electrical cabinet heater and exhaust fan

X

Selectable 3 day drain after no period with no demand

X

Potable, deionized, and reverse osmosis water

X

7 | The Nortec SETC/P

Nortec SE Humidifier Components

Figure 5: Nortec SETC Humidifier Components

Display and Keypad

Float Chamber

Control Terminal Strip

Remote Relay

Board

Driver Board

High Voltage

Terminal Block

Transformer

Base

Clean Out

Port

Tank

Total Controller

Steam Outlet

Fill Box

Vacuum Break

Steam Inlet

(Boiler Steam)

P Trap

Fill Valve

Drain Outlet

Condensate Drain

(Boiler Steam)

Auxiliary Drain

Outlet

Drain Pump

Mixing Box

Steam Trap

Heat

Exchangers

(Faceplate)

On/Off Switch

Heat

Exchanger

Gasket

Actuator

Wye Strainer

CV Valve

Manual Drain Switch

The Nortec SETC/P | 8

Description of Components

Table 2: Humidifier Components

Component

Function of Component

Actuator

Opens and closes the CV valve in proportion to demand for steam.

Auxiliary Drain Outlet

Drains water from tank in case of pump failure.

Base

Provides an integrated floor support for the humidifier.

Clean Out Port

Provides access to clean scale from the tank and heat exchanger.

Condensate Drain

Drains condensate formed from boiler steam in the heat exchanger(s)

Control Terminal Strip

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

CV Valve

Controls the amount of steam allowed into the heat exchanger which in turn controls

the output of the humidifier.

Display and Keypad

User interface for configuring the humidifier.

Drain Outlet

Drain port used for draining water from the humidifier tank.

Drain Pump

Drains water from humidifier.

Driver Board

Provides input and output connections to humidifier components.

Fill Box

Provides an air gap for backflow prevention.

Fill Valve

Controls flow of water into humidifier.

Float Chamber

Measures water level in the humidifier tank.

Gasket

Seals heat exchanger face plate and clean out port cover to tank.

Heat Exchanger(s)

Exchanges energy from boiler steam to the tank water to produce steam for

humidification. The faceplate mounts the heat exchanger to the tank.

High Voltage Terminal

Block

Primary power connection from remote disconnect to humidifier.

Manual Drain Switch

Manually activates pump to drain water from the tank.

Mixing Box

Blends hot tank water with cool fill water to provide drain water cooling.

On/Off Switch

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

shut off primary power to the humidifier.

P Trap

Prevents steam from flowing out the drain outlet.

Remote Relay Board

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 Inlet

Connection for boiler steam, it is connected to the heat exchangers.

Steam Outlet

Connect to steam line with steam hose.

Steam Trap

Drains condensate from the heat exchanger without letting boiler steam escape to

drain.

Tank

Holds the water used to generate clean steam for humidification.

Total 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.

Vacum Break

Prevents a siphon from occurring when the drain pump is stopped.

Wye Strainer

Protects CV valve and other system components from dirt and rust in the piping

system.

9 | The Nortec SETC/P

Nortec SE Outdoor Components

Figure 6: Nortec SETC Outdoor Components

Table 3: Nortec SETC Outdoor Components

Component

Function of Component

Cabinet Drain

Drain outlet for integrated cabinet drain pan (outdoor unit only). Drain to rooftop.

Cabinet Thermostat

Sensor that activates the heaters if the cabinet temperature is too cold for the

electronics (will not prevent the tank and water components from freezing).

Exhaust Fan

Cooling fan which is activated if the electrical cabinet gets too hot.

Heater

Electrical cabinet heater used to keep electronics warm enough for operation and

cold weather start up only.

Lifting Hooks

Hooks provided for lifting the humidifier.

Mounting Panel

A panel provided on the outside of the humidifier for mounting a dedicated external

disconnect.

Outdoor Cabinet

An enclosure that provides protection from precipitation and allows the Nortec SETC

to be installed outdoors.

Outdoor Mounting Base

An integrated support for the humidifier which includes a drain pan (outdoor unit

only), a pipe chase, and a means for curb mounting the humidifier.

Pipe Chase

An opening in the outdoor cabinet’s drain pan which is used for routing electrical

power, controls, boiler steam, boiler condensate, fill water, and drain water through

the base of the humidifier.

Steam Outlet

Outlet for steam produced by the humidifier. Connect to steam line with steam hose.

Mounting Panel

(External Disconnect)

Exhaust Fan

Cabinet Thermostat

Lifting Hook (4)

Heater

Cabinet Drain

(Drain Pan)

Outdoor Cabinet

Steam Outlet

Outdoor Mounting Base

(With integral drain

pan)

Pipe Chase

(not visible)

The Nortec SETC/P | 10

Nortec SE Humidifier Specifications and Dimensions

Table 4: Nortec SETC/P Specifications

Nortec

Model

SETC

Indoor

Part No

SEP

Part No.

CV

Valve

CV Valve,

Steam

Inlet, Wye

Port (NPT)

Cond-

ensate

Port

(NPT)

Net/Full

Weight

Indoor

lb (kg)

Required

fill line

flow

gal (l)

/min

Required

Drain

capacity

gal (l)

/min

Electrical

(Indoor

only, see

Table 6 for

outdoor)

50

2552765

2520383

2.8

1/2

3/4

125/180

(57/82)

2.6 (10)

5.2 (20)

Voltage

110-120

Phase

1

Amps

1.25 A

Power

0.15 KW

Max

Disconnect

15 A

100

2550073

2525132

5.5

3/4

267/423

(121/192)

175

2550074

2525133

10

1

3/4

250

2550075

2525134

12

1

3/4

355/599

(161/272)

375

2550076

2525135

20

1 1/4

3/4

525

2550077

2553312

28

1 1/2

1

529/992

(240/450)

750

2550078

2553313

40

2

1

4.5 (17)

8 (29)

1050

2550080

2525139

77

2, 2 1/2,

2 1/2

1 1/4

703/1384

(318/628)

Table 5: Nortec SETC/P Capacities and Water Consumption

Nortec

Model

*Supply

Steam

Pressure

(psig)

*Max Output

lb/hr (kg/hr)

Approximate

Boiler Steam

Consumption

lb/hr (kg/hr)

**Water

Consumption

gal (l) /hr

**Drain Volume

gal (l) /hr

50

5

13

(6)

15

(7)

2.3

(9)

0.8

(3)

10

32

(14)

36

(16)

5.7

(21)

1.9

(7)

15

50

(23)

58

(26)

9.0

(34)

3.0

(11)

100

5

26

(12)

30

(14)

4.7

(18)

1.6

(6)

10

63

(29)

72

(33)

11.3

(43)

3.8

(14)

15

100

(45)

115

(52)

18.0

(68)

6.0

(23)

175

5

46

(21)

52

(24)

8.2

(31)

2.7

(10)

10

110

(50)

127

(58)

19.8

(75)

6.6

(25)

15

175

(80)

201

(91)

31.5

(119)

10.5

(40)

250

5

65

(30)

75

(34)

11.7

(44)

3.9

(15)

10

158

(72)

181

(82)

28.3

(107)

9.4

(36)

15

250

(114)

288

(131)

44.9

(170)

15.0

(57)

375

5

98

(44)

112

(51)

17.5

(66)

5.8

(22)

10

236

(107)

272

(123)

42.5

(161)

14.2

(54)

15

375

(170)

431

(196)

67.4

(255)

22.5

(85)

525

5

137

(62)

157

(71)

24.5

(93)

8.2

(31)

10

331

(150)

380

(173)

59.5

(225)

19.8

(75)

15

525

(239)

604

(274)

94.4

(357)

31.5

(119)

750

5

195

(89)

224

(102)

35.1

(133)

11.7

(44)

10

473

(215)

543

(247)

84.9

(321)

28.3

(107)

15

750

(341)

863

(392)

134.8

(510)

44.9

(170)

1050

5

273

(124)

314

(143)

49.1

(186)

16.4

(62)

10

662

(301)

761

(346)

118.9

(450)

39.6

(150)

15

1050

(477)

1208

(549)

188.7

(714)

62.9

(238)

* Supply steam pressure must be present at the CV valve to achieve rated output

** At maximum output , 25% blow down, and with drain water cooling activated.

11 | The Nortec SETC/P

Figure 7: Nortec SE Indoor Dimensions

The Nortec SETC/P | 12

Table 6: Nortec SETC Outdoor Specifications

Nortec

Model

SETC

Outdoor

Part No

Net/Full

Weight

lb (kg)

Amps

,

A

Power

.

KW

Max.

Disconnect

A

Voltage

and

Phase

100

2550081

267/423

(121/192)

5.4

0.65

15

Voltage

110-120

Phase

1

175

2550082

5.4

0.65

15

250

2550083

355/599

(161/272)

5.4

0.65

15

375

2550084

5.4

0.65

15

525

2550085

529/992

(240/450)

9.6

1.15

15

750

2550086

9.6

1.15

15

1050

2550088

703/1384

(318/628)

13.8

1.65

20

Note: See Table 4: Nortec SETC/P Specifications and Table 5: Nortec SETC/P Capacities and Water Consumption

on page 10 of Nortec SE Series Installation manual for remaining specifications

Figure 8: Nortec SETC Outdoor Dimensions

13 | Specifying the SE Humidifier

Specifying the

Nortec SE Humidifier

14 Humidifier Specification Checklist

15 Humidifier Load

15 Humidification Load

15 Supply Line Losses

16 Distributor Losses

17 Supply Steam Pressure

18 Humidifier Controls

18 Installation Location

19 Steam Distribution Method

19 Nortec Nortec SE Series Options and

Accessories

24 Sample Specification

Specifying the SE Humidifier | 14

Humidifier Specification Checklist

The following checklist can be used to specify the Nortec SE Series Humidifier. A description of

each selection is provided later on in this section.

Humidifier Tag: _______________ Zone _______________

Humidifier Model ____________________________ Part No _______________

Humidifier Load ______________lb/hr =

Humidification Load _______ + Supply Line Losses_______+ Distribution Losses_______

Supply Steam Pressure __________ psi Capacity at Supply Pressure __________________

Humidity Control

 Demand  Transducer  On/Off Signal Type _______

 By Others  By Nortec, Part No_______________

High Limit

 Demand (SETC Only)  Transducer (SETC Only)  On/Off Signal Type _______

 By Others  By Nortec, Part No _______________

Location

 Indoor  Stand,  Ceiling kit, Part No _______________

 Outdoor

Steam Distribution

 Duct Width _____________ Height __________________

 SAM-e

Header Length __________ Tube spacing __________ Part No _______________

Distribution Tube Length ______________ Qty ________ Part No _______________

Steam Inlet type __________________ Part No _______________

 Tube Insulation, Qty ________________ Part No _______________

 Header Insulation, Part No _______________

 Mounting Frame, Part No _______________

 Distributor, Length ______________ Qty ____________ Part No _______________

 Blower Pack, Qty ____________ Part No _______________

Additional Options (Links 2, Nortec Online, Air proving… See Table 8: Options and Accessories)

_________________________________________________________________________________

15 | Specifying the SE Humidifier

Humidifier Load

The Nortec SE Series humidifiers are available with capacities ranging from 50 to 1050 lb/hr

(22.5 to 477 Kg/hr). In addition to the available models, up to 10 humidifiers can be combined

together to operate from one control signal for capacities of over 10,500 lb/hr (4,770 Kg/hr).

The humidifier(s) selected must have a capacity equal to or greater than the load.

The humidifier load is made up of three components;

1 Humidification Load - Water that must be added to the air to achieve the desired humidity

level.

2 Supply Line Losses – Water that condenses in the steam lines between the humidifier and

the location where the steam is being introduced into the air.

3 Distributor Losses – Water that condenses in the steam distributor itself.

Figure 9: Humidifier Load

Humidification Load

The easiest way to calculate the humidification load for any application is to use Condair’s

Humidifier Engineering and Load-sizing Program (HELP). The software can be downloaded from

www.condair.com. Condair Publication 2553856 - Humidification Load Calculation also

provides information on selecting a humidity setpoint, the effects of relative humidity, and

methods for manually calculating the humidification load.

Supply Line Losses

Table 11: Maximum Recommended Length of Steam Line on page 44 provides maximum

recommended lengths for various steam line sizes as well as possible losses due to

condensation in steam lines. Table 12: Equivalent Length of Some Common Fittings on page

gives equivalent lengths of some common fittings used in making steam lines. The information

in the tables along with information about the layout and length of the steam line should be

used to estimate the supply line losses.

2) Supply

line losses

3) Distributor

losses

1) Humidification

load

Humidifier

Distributor

Steam supply

line

1) Humidification load

+ 2) Supply line losses

+ 3) Distributor losses

= Humidifier Load

Specifying the SE Humidifier | 16

Example 1: Supply Line Losses - Nortec SE 250 with 30 ft x 3 in. steam line with one 90º elbow.

1 Obtain possible losses for 3 in line from Table 11.

A = 0.16 lb/hr/ft

2 Calculate the equivalent length of steam line using 3 in. 90º Elbow in Table 12.

B = 30 ft + 5 ft = 35 ft.

3 Multiply the equivalent length by the possible losses to get supply line losses.

C = B x A = 35 x 0.16 = 5.6 lb/hr

Distributor Losses

Convection heat transfer between a steam distributor in a duct and the air in the duct is the

primary mechanism responsible for distributor losses. The amount of losses is proportional to

the length of distributor and the temperature of the air in the duct. Figure 10 can be used to

estimate distributor losses.

Figure 10: Distributor Losses

50ºF Standard

60ºF Standard

70ºF Standard

80ºF Standard

50ºF 50ºF

60°F Insulated

70°F

80°F

Note:

Condair’s patent pending stainless steel Air-gap Insulation provides one method for

reducing a distributor losses and conserving energy. See Condair publication 1503529 –

SAM-e Engineering Manual for more information on specifying SAM-e insulation.

17 | Specifying the SE Humidifier

Example 2: Distributor Losses – What are approximate condensate losses in a 48 “ tall

standard SAM-e with 12 distribution tubes in a 70ºF duct with 1200 fpm velocity.

1 Obtain losses per linear foot of distributor from Figure 10.

A = 0.45 lb/hr/ft

2 Calculate approximate length of all distributor tubes.

B = 12 tubes x 4 ft/tube = 48 ft

3 Multiply approximate length of all tubes by losses per linear foot to get distributor losses.

C = 48 x 0.45 = 21.6 lb/hr

Supply Steam Pressure

One of the unique features of the steam exchange humidifier is that its maximum output is

affected by the steam supply pressure. Models are designated by the capacities at maximum

supply pressure of 15 psi. An Nortec SETC 1050 will produce 1050 lb/hr (477 Kg/hr) of steam

when supplied with 15 psi steam. If the available steam supply pressure is lower than 15 psi

then the output will be reduced as shown in Figure 11. Table 5: Nortec SETC/P Capacities and

Water Consumption also provides steam output at 10 and 5 psi supply pressures.

Figure 11: Output as a Function of Supply Steam Pressure

To select the model(s) of Nortec SE humidifier that is required to fulfill a given humidifier load

requirement, the output must be de-rated if the supply steam pressure is lower than 15 psi.

Note:.

The steam supply line must be designed to provide design pressure at the CV valve

when there is 100 % demand (CV valve completely open). Pressure losses in the

steam supply line will reduce Nortec SE output.

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

5 6 7 8 9 10 11 12 13 14 15

Pressue (Psi)

Maximum Capacity as % of Rated

Pressure (Psi)

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