DriSteem SINGLE-TUBE Series, MINI-BANK Series, MULTIPLE-TUBE Series, AREA-TYPE Series Installation, Operation And Maintenance Manual

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STEAM INJECTION

Humidifiers

Installation, Operation, and Maintenance Manual

For use with steam boilers

Page 2

Safety precautions

ATTENTION INSTALLER Read this manual before installing.

Leave manual with product owner.

Where to find more information On our website: The following related documents can be

viewed, printed, or ordered from our website, www.dristeem.com

In Dri-calc Dri-calc is DriSteem’s free sizing and

selection software for calculating load, determining non-wetting distance, and selecting equipment. See Dri-calc on the www.dristeem.com Tools page. Also in Dri-calc:

A comprehensive library of Installation Guide documents, including:

• Recommended placement within a duct or air handler

• Recommended sensor placement

Or call us at 800-328-4447 Obtaining documents from our website or

from Dri-calc is the quickest way to view our literature, or we will be happy to mail literature to you.

WARNING

Indicates a hazardous situation that could result in death or serious injury if instructions are not followed.

WARNING

Attention installer

Read this manual before installing, and leave this manual with product owner. This product must be installed by qualiﬁed HVAC and electrical contractors and in compliance with local, state, federal, and governing codes. Improper installation can cause property damage, severe personal injury, or death as a result of electric shock, burns, or ﬁre.

DriSteem® technical support: 800-328-4447

Read all warnings and instructions

Read this manual before performing service or maintenance procedures on any part of the system. Failure to follow all warnings and instructions could produce the hazardous situations described, resulting in property damage, personal injury, or death.

Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause bacteria and mold growth or dripping water into building spaces. Dripping water can cause property damage; bacteria and mold growth can cause illness.

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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Hot surfaces and hot water

Steam Injection humidiﬁers have extremely hot surfaces. Water in steam pipes and dispersion assemblies can be as hot as 212 °F (100 °C). Discharged steam is not visible. Contact with hot surfaces, discharged hot water, or air into which steam has been discharged can cause severe personal injury. To avoid severe burns, allow the system to cool before performing service or maintenance procedures on any part of the system.

Page 3

Table of contents

OVERVIEW.................................................................2

Introduction .............................................2

Available models .........................................3

Basic components ........................................4

Principle of operation ......................................5

Humidifier placement ......................................6

Sensor placement ........................................9

Pressurized steam piping guidelines ..........................10

Condensate drain piping and trapping ........................14

Temperature switches .....................................16

SINGLE-TUBE HUMIDIFIER ....................................................20

Configurations .........................................20

Assembly .............................................21

Installation ............................................22

Piping notes ...........................................23

Field piping ...........................................24

MULTIPLE-TUBE HUMIDIFIER ..................................................28

Field assembly .........................................28

Installation ............................................29

Piping notes ...........................................30

Field piping ...........................................31

WARNING

Hot surface hazard

Steam humidiﬁcation systems have extremely hot surfaces.

To avoid burns, allow humidiﬁer, steam pipes, and dispersion assemblies to cool before touching any part of the system.

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ATTENTION INSTALLER

Read this manual before installing. Leave manual with product owner.

DriSteem technical support

800-328-4447

MAXI-BANK HUMIDIFIER .................................................... 36

Maxi-bank option field assembly and installation .................36

Maxi-bank option piping notes ..............................39

Maxi-bank option field piping ...............................40

Assembly and installation ..................................45

MINI-BANK HUMIDIFIER .....................................................45

Field piping ...........................................47

AREA-TYPE HUMIDIFIER ..................................................... 48

Installation ............................................48

Field piping ...........................................49

Rise, spread, and throw dimensions ..........................50

Humidifier start-up and shut-down ............................51

OPERATION ..............................................................51

Eliminating excess heat from steam jacketed humidifiers ............52

MAINTENANCE ........................................................... 54

Maintenance procedures ..................................54

Troubleshooting .........................................55

TROUBLESHOOTING........................................................ 55

REPLACEMENT PARTS ....................................................... 58

Single-tube and Multiple-tube humidifiers .......................58

Area-type humidifier .....................................60

Mini-bank humidifier .....................................61

WARRANTY .............................................................. 62

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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OVERVIEW

Introduction

SUITABLE FOR A WIDE RANGE OF APPLICATIONS

Steam Injection humidiﬁers from DriSteem® use steam from an external source, such as an in-house boiler or a district steam system. DriSteem’s Steam Injection humidiﬁers are adaptable to virtually any size application, and a wide variety of models accommodate a broad range of steam absorption requirements.

STEAM JACKETED DISPERSION TUBE MODELS FOR DUCTS AND AIR HANDLERS

Single-tube, Mini-bank®, and Multiple-tube humidiﬁers are designed for ducts and air handlers, and capable of a wide range of guaranteed non-wetting distances.

AREA-TYPE FOR OPEN SPACES

Area-type™ Steam Injection humidiﬁers are designed for open spaces such as warehouses and manufacturing spaces that do not have a duct system. The steam discharged from the humidiﬁer is quietly dispersed by a fan without introducing water droplets into the air.

FIGURE 2-1: STEAM INJECTION HUMIDIFIERS

Each Single-tube, Mini-bank®, and Multiple-tube humidiﬁer has the same basic components: a stainless steel separator, a steam valve, and one or more jacketed dispersion tubes.

For open spaces, boiler steam can be dispersed by the fan of an Area-type model.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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Available models

OVERVIEW

FIGURE 3-1: STEAM INJECTION HUMIDIFIER MODELS

SINGLE-TUBE HUMIDIFIER

• Suitable for small- to medium-capacity systems,

1.5 – 525 lbs/hr (0.7 – 238 kg/h)

• Moderate to long non-wetting distance

• Pre-assembled separator/tube assembly

MINI-BANK HUMIDIFIER

• Suitable for small-capacity systems, 1.6 – 84 lbs/ hr (0.7 – 38 kg/h)

• Short to moderate non-wetting distance

• Sized for small ducts

• Pre-engineered and pre-assembled header/tube assembly, ready for mounting and hookup

MULTIPLE-TUBE HUMIDIFIER

• Suitable for small- to large-capacity systems,

6.5 – 3989 lbs/hr (2.3 – 1809 kg/h)

• Sizes to ﬁt small ducts and large air handlers

• Short to moderate non-wetting distance

• Field assembled (with interconnecting piping and header supplied by contractor)

• Maxi-bank™ option: – Pre-assembled, except when either dimension

is 98 inches (2490 mm) or more

– Includes 304 stainless steel header, with

option for 316 stainless steel

– Includes black iron piping, with options for

304 or 316 stainless steel

All Steam Injection humidiﬁers shown here, except Area-type, are available with options for applications requiring stainless steel steam components.

mc_033111_0500

AREA-TYPE HUMIDIFIER

• Suitable for medium-capacity systems, 1.8 – 286 lbs/hr (0.8 – 130 kg/h)

• Used in open spaces

• Application-dependent non-wetting distances

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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OVERVIEW

Basic components

FIGURE 4-1: STEAM INJECTION HUMIDIFIER COMPONENTS

Section Y-Y

OM-378

Section X-X

Condensate

Steam

OM-376

Tube proﬁle with insulation

Steam-ﬁlled jacket

Steam-discharge tubelet

Dispersion tube

Optional PVDF insulation

1. Steam jacket

A chamber that jackets the inner dispersion tube with hot steam to eliminate condensation and dripping

OM-1171

Tube proﬁle without insulation

2. Steam separator

Separates steam from condensate

3. Deflector plate

Inside the steam separator, deflects condensate into a circular pattern and toward the drain

4. Multi-baffle plate

Allows only steam to rise into the upper region of the separator

5. Internal drying tube

Excludes any remaining condensate, allowing only dry steam to leave the separator

6. Steam valve

Controls the amount of steam allowed into the dispersion tube

7. Dispersion tube

Provides uniform steam dispersion across the duct width

8. Thermal-resin tubelet

Unique tubelets extend into the dispersion tube center so only the hottest, driest steam is discharged into the air. These tubelets also have an exceptional ability to trap noise generated by the valve, making DriSteem’s Steam Injection humidifiers the quietest in the industry.

9. Steam trap

Allows only condensate to pass to the condensate return system

See Figure 5-1 for a description of how these components operate together.

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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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Principle of operation

FIGURE 5-1: STEAM INJECTION HUMIDIFIER PRINCIPLE OF OPERATION

OVERVIEW

OM-1170

About right-hand and left-hand discharge:

Imagine you are standing in the duct where the Steam Injection humidiﬁer is to be installed, with airﬂow blowing into your face:

• Specify the humidiﬁer with right-hand discharge if the separator is on your right.

• Specify the humidiﬁer with left-hand discharge if the separator is on your left.

For consistency, humidiﬁer drawings in this catalog are shown with right-hand discharge.

1. Boiler steam enters the humidifier at line pressure and flows through a chamber (jacket) surrounding an inner dispersion tube. The jacket of steam preheats the dispersion tube so that when steam enters the dispersion tube (at Step 5 below) it does not condense as it would if the tube were cold, thereby eliminating condensation and dripping.

2. After flowing through the steam jacket, steam with entrained condensate slows from entering the larger space of the separator and from hitting the perimeter deflector plate, and begins to spin and separate.

3. Separated steam rises through slots in the multi-baffle plate to the separator upper region, and enters the internal drying tube that excludes any remaining condensate, allowing only dry steam to leave the separator.

4. Separated condensate drains from the separator to the steam trap.

5. The steam valve controls the amount of steam allowed into the preheated dispersion tube. The steam valve is typically controlled in one of two ways:

• By a signal from a building automation system

• By a humidity controller connected to the steam valve

6. Steam is discharged uniformly through the tubelets into the airstream.

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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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OVERVIEW

Humidiﬁer placement

USE THESE EXAMPLES AS GUIDELINES

Proper humidiﬁer placement is crucial for successful system operation. Usually, there is no single correct placement for a humidiﬁer. Much depends on system design and application. The following paragraphs and dispersion assembly placement examples are presented as guidelines for common situations.

FIRST, CHECK AVAILABLE ABSORPTION DISTANCE

Available absorption distance affects system choice. Dispersed steam must be absorbed into the airﬂow before it comes in contact with any duct elbows, fans, vanes, ﬁlters, or any object that can cause condensation and dripping.

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PLACING A STEAM INJECTION HUMIDIFIER IN AN AHU (SEE FIGURE 6-1)

• Location A is the best choice. Installing downstream from heating and cooling coils provides laminar ﬂow through the dispersion unit; plus, the heated air provides an environment for best absorption. Use a multiple tube dispersion unit to ensure complete absorption of steam vapor before fan entry.

• Location B is the second-best choice. In change-over periods, the cooling coil will eliminate some moisture for humidiﬁcation.

• Location C is the third-best choice. Air leaving a fan is usually very turbulent and may cause vapor to not absorb at the expected absorption distance. Allow for more absorption distance if installing downstream from a fan.

• Location D is the poorest choice. The cooler air at this location requires an increased absorption distance.

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Figure 6-1: Placing a Steam Injection humidiﬁer in an air handling unit (AHU)

Cooling coil

8' to 12' (2.4 m to 3.7 m)

ABD

3' to 5' (1 m to 1.5 m)

8' to 12' (2.4 m to 3.7 m)

Outside air

Exterior building wall

Relief air

Economizer control device

Preheat coil

Motorized air dampers

Filters

Heating coil

Duct high limit humidity control for humidiﬁer locations A, B

Airﬂow proving switch

Fan

Humidiﬁer discharges against airﬂow

Airﬂow proving switch

Return airﬂow

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Supply airﬂow

Duct high limit humidity control for humidiﬁer location C

DC-1081 mc_071911_1517

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Humidiﬁer placement

PLACING A STEAM INJECTION HUMIDIFIER NEAR AN ELBOW (SEE FIGURE 7-1)

• Location A is the best choice. Better absorption occurs on the downstream side of an elbow than on the upstream side.

• Location B is the second-best choice. Installing upstream from an elbow can cause wetting at the turning vanes. In cases where it is structurally impossible to avoid Location B, use a multiple tube humidiﬁer to ensure complete absorption. Also, since more air ﬂows along the outside of a turn, better absorption occurs if the humidiﬁer discharges proportionately more steam in that part of the airstream.

• At both locations, discharging steam against or perpendicular to the airstream gives slightly better mixing and absorption than discharging with the airstream.

mc_071911_1518

FIGURE 7-1: PLACING A STEAM INJECTION HUMIDIFIER ASSEMBLY NEAR AN ELBOW

OVERVIEW

Airﬂow

Duct

Less airﬂow on this side of elbow

Duct high limit humidistat

Mist can collect on vanes

(2.4 m to 3.7 m)

DC-1083-1 mc_071911_1519

Airﬂow

3' to 5'

(1 m to 1.5 m)

8' to 12'

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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OVERVIEW

Humidiﬁer placement

PLACING A STEAM INJECTION HUMIDIFIER IN A PRIMARY/SECONDARY SYSTEM (SEE FIGURE 8-1)

This type of system is commonly applied to facilities where most of the building requires one humidity level (typically to meet comfort requirements) and part of the building requires additional humidity. In Figure 8-1, the primary humidiﬁcation system is within the main air handling unit. The secondary humidiﬁcation system is located close to the point of steam discharge into the secondary area.

FIGURE 8-1: PLACING A STEAM INJECTION HUMIDIFIER IN A PRIMARY/SECONDARY SYSTEM

Exhaust airOutside air

Filter mixing box

Before humidiﬁer: 50 °F (10 °C), 47% RH

Primary humidiﬁer location

After humidiﬁer: 50 °F (10 °C), 60% RH

70 °F (21 °C), 30% RH

Secondary humidiﬁer location

50 °F (10 °C) 60% RH

VAV box

Primary area: 70 °F (21 °C), 30% RH

50 °F (10 °C), 60% RH

Secondary humidiﬁed area

Room transmitter: 65 °F (18 °C), 50% RH

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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Sensor placement

OVERVIEW

SENSOR LOCATION IS CRITICAL

Sensor location has a signiﬁcant impact on humidiﬁer performance. See the recommendations below and Figure 9-1.

Note: DriSteem recommends that you do not interchange room and duct

humidity devices. Room humidity devices are calibrated with zero or little airﬂow, whereas duct humidity devices require air passing across them.

Recommended humidity control (transmitter/humidistat) locations:

A Ideal. Ensures the best uniform mix of dry and moist air with stable

temperature control.

B Acceptable, but room environment can affect controllability, such as

when sensor is too close to air grilles, registers, or heat radiation from room lighting.

C Acceptable. Provides uniform mixture of dry and moist air. If extended

time lag exists between humidity generation and sensing, extend sampling time.

D Acceptable (behind wall or partition) for sampling entire room if sensor

is near an air exhaust return outlet. Typical placement for sampling a critical area.

E Not acceptable. These locations might not represent actual overall

conditions in the space.

F Not acceptable. Do not place sensors near windows, door

passageways, or areas of stagnant airﬂow.

Other factors affecting humidity control

Humidity control involves more than the controller’s ability to control the system. Other factors that play an important role in overall system control are:

• Size of humidification system relative to load

• Overall system dynamics associated with moisture migration time lags

• Accuracy of humidistats and humidity transmitters and their location

• Dry bulb temperature accuracy in space or duct

• Velocities and airflow patterns in ducts and space environments

• Electrical noise or interference

mc_072011_1656

Recommended safety (airﬂow and high limit) sensor location:

G Best sensing location for high limit humidistat or humidity sensor and

airﬂow proving switch.

FIGURE 9-1: RECOMMENDED SENSOR LOCATIONS

8' to 12'

Wall or partition

(2.4 m to 3.7 m)

min.

•

Window

DC-1084

Outside air

Relief air

Damper control

Return air

•

Window

Doorway

Air handling

unit

•

High limit humidistat or high limit transmitter (set at 90% RH maximum) for VAV applications

Airﬂow switch or differential pressure switch (sail type recommended for VAV applications)

Vapor absorption has taken place

Point of vapor absorption

Humidiﬁer dispersion assembly

Turning vanes

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 12

OVERVIEW

Pressurized steam piping guidelines

• Size piping in accordance with ASHRAE recommendations.

• Humidiﬁer's steam supply should be taken off top of steam main (not side or bottom) to ensure the driest steam. Main should be dripped and trapped (in accordance with ASHRAE recommendations).

• Humidiﬁer steam trap(s) must drain by gravity to return main having little or no back pressure. If condensate cannot drain by gravity, then it must be elevated to return main (see Figure 12-1 for instructions).

• If steam pressure is less than or equal to 15 psi (103.4 kPa), use ﬂoat and thermostatic (F&T) traps for the humidiﬁer.

If steam pressure is greater than 15 psi (103.4 kPa), use inverted bucket

traps for the humidiﬁer.

• If lifting condensate, use an inverted bucket trap and check valve regardless of steam pressure. See Figure 12-1 for instructions.

• Condensate from unavoidable heat loss in the distribution system must be removed promptly to eliminate water hammer and degradation of steam quality and heat transfer capability. Install drip legs at all low points and natural drainage points in the system, such as at ends of mains; bottoms of risers; and ahead of pressure regulators, control valves, isolation valves, pipe bends, and expansion joints.

On straight, horizontal runs with no natural drainage points, space drip

legs at the following intervals:

– Not exceeding 300' (91 m) when the pipe is pitched down in the

direction of the steam ﬂow

– At a maximum of 150' (46 m) when the pipe is pitched up, so that

condensate ﬂow is opposite of steam ﬂow.

These distances apply to systems where valves are opened manually to

remove air and excess condensate that forms during warm-up conditions. Reduce these distances by about half in systems that are warmed up automatically.

• Insulate piping well to avoid unnecessary heat loss.

• Pitch return lines downward in the direction of the condensate ﬂow at 1/2" per 10' (0.4%).

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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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Pressurized steam piping guidelines

FIGURE 11-1: FIELD PIPING OVERVIEW

OVERVIEW

Take off branch lines from the top of the steam main, preferably at a 45° angle, although vertical 90° connections are acceptable

Insulate piping

DC-1200M

End of main steam trap by installer

Condensate return

Blowdown valve by installer

45°

Pitch humidiﬁer branch 1/2" per 10' (0.4%) if distance from main to humidiﬁer is less than 10' (3.3 m)

Automatic warm-up: 28" (711 mm) min. Supervised warm-up:

1.5 × pipe diameter, 8" (203 mm) min.

If pipe is 4" (DN100) or larger, size drip for 50% of the condensate load at start-up. If pipe is less than 4" (DN100), size drip for 25% of the condensate load at start-up.

Branch steam trap by installer

Blowdown valve by installer

Branch trap recommended if distance from main to humidiﬁer is greater than 10' (3.3 m)

Condensate return

Pitch main 1/4" per 10' (0.2%)

Piping same size as humidiﬁer inlet strainer

To humidiﬁer. Inlet strainer must be within 3' (1 m) of humidiﬁer

Humidiﬁer isolation valve

Insulate piping

12" (305 mm) min.

4" (100 mm) min.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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OVERVIEW

Pressurized steam piping guidelines

FIGURE 12-1: ELEVATING CONDENSATE FROM A STEAM INJECTION HUMIDIFIER

Pitch 1/2" per 10' (0.4%)

Elevated condensate return main

1/2" pipe thread (DN15)

5' (1.5 m) maximum

Condensate return ﬂow

Inverted bucket steam trap

Check valve (swing type)

DC-1064

In certain installations, it is not possible to drain the humidiﬁer steam trap by gravity. The condensate must be lifted. Generally, lifting condensate is not recommended, but it can be done successfully by observing the following rules:

• Steam pressure. Theoretically, one pound (6.9 kPa) of steam pressure will lift condensate about 2' (0.6 m). But

in practice, because of pipe friction, pressure drop through a steam trap, and back pressure in a return line, we recommend maximum lift of 6" per pound (0.2 m per 6.9 kPa) of steam pressure at the trap. For example, a steam pressure of 5 psi (34.5 kPa) will provide a maximum lift of 2.5' (0.76 m). Lifting condensate more than 5' (1.5 m) should not be attempted.

• Steam trap. When lifting condensate, use an inverted bucket steam trap. Float and thermostatic (F&T) traps are

more prone to water hammer damage with a ﬂooded trap, which may occur when lifting condensate.

• Pipe size. The size of the vertical portion of the piping should be 1/2" pipe thread (DN15).

• Check valve (swing type). A low-pressure differential swing check valve should be installed adjacent to the trap.

This will prevent backﬂow of condensate into the humidiﬁer during periods of little or no steam pressure. Failure to do so could result in accumulated backﬂow discharging from the humidiﬁer when steam pressure is resumed. Spring-type check valves are not recommended, as they can reduce pressure available for condensate lifts.

Condensate lifting recommendations:

1. Condensate can be lifted for all steam jacket piping.

2. Condensate could be lifted for connection to separator, but performance could vary based on variable pressure at the separator.

3. Condensate cannot be lifted for connection on headers for Multiple-tube humidifiers (including Maxi-bank option).

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STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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Pressurized steam piping guidelines

FIGURE 13-1: MULTIPLE VALVE PLUMBING GUIDELINES

Isolation valve (by others)

From steam source

Install strainer within 3' (1 m) of humidiﬁer (see Note 2)

OVERVIEW

Piping to be same size as strainer

Piping to be same size as valves

Valve

Piping to be same size as separator inlet

Notes:

1. Dashed lines indicate provided by installer.

2. Steam valve and strainer sizes are provided by DriCalc, DriSteem's free sizing and selection software, available at www.dristeem.com.

mc_042811_1450

Separator

Steam trap

Separator

Steam trap

Union

Valve

Union

4" (100 mm)

To Multiple-tube header inlet

DC-1488

Piping to be same size as separator inlet

12" (305 mm)

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 16

OVERVIEW

Condensate drain piping and trapping

FIGURE 14-1: CONDENSATE DRAIN PIPING AND TRAPS FOR STEAM INJECTION HUMIDIFIERS

P-trap dimensions

Condensate outlet

Drop

Lifting condensate

From P-trap or mechanical trap

Condensate pump*

Seal

Check valve

Mechanical trap dimensions

Typical model

Condensate outlet

Drop

Drip

F&T trap (shown) or inverted bucket trap

Notes: * Use condensate pump rated for 212 °F (100 °C) and suitable for lifting 250 gph (16 L/m)

at required head (60 kPa). Stainless steel condensate pump recommended when pumping condensate from systems using optional stainless steel components.

• If wasting condensate to drain, temper condensate to local code to prevent damage to drain plumbing.

• Dashed lines indicate provided by installer.

Stainless steel components model

Condensate outlet

Drip

Cooling

leg

Stainless steel thermostatic trap

mc_050211_1314

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 17

Condensate drain piping and trapping

Table 15-1: Condensate drain piping and traps for Steam Injection humidifiers

Single-tube, Mini-bank, and Multiple-tube humidiﬁers

P-trap water seal

Piping from separator*** Piping from steam jackets Piping from header

Typical

model

Models with optional stainless steel components

Typical

model

Do not use Do not use Do not use Do not use Do not use Do not use

Models with optional

stainless steel

components

Typical

model

Models with optional stainless steel components

OVERVIEW

Area-type humidiﬁer

Piping

from

separator

Use with

minimum:

Drop: 8"

(203 mm)

Seal: 10"

(254 mm)

F&T trap

Inverted bucket trap*

Stainless steel thermostatic trap

Use if steam

pressure is ≤15 psi

(103.4 kPa):

Drop: 12" (305 mm)

Drip: 4" (102 mm)

Use if steam

pressure is >15 psi (103.4 kPa): Drop: 12" (305 mm)

Drip: 4" (102 mm)

Do not use

Use with stainless

steel

piping with

minimum:

Drip: 4" (102 mm)

Cooling leg: 24"

(610 mm)

Use only if not lifting

condensate and

steam pressure is

≤15 psi (103.4 kPa):

Drop: 12" (305 mm)

Drip: 4" (102 mm)

Use if lifting

condensate or if

steam pressure is

>15 psi (103.4 kPa):

Drop: 12" (305 mm)

Drip: 4" (102 mm)

Do not use

Do not use Do not use Do not use Do not use

Use with stainless

steel piping with

minimum:

Drip: 4" (102 mm)

Cooling leg: 24"

(610 mm)

Use with

minimum:

Drop: 12"

(305 mm)

Drip: 4"

(102 mm)

Do not use

Do not use Do not use

Use with stainless

steel piping with

minimum:

Drip: 4" (102 mm)

Do not use

Cooling leg: 24"

(610 mm)

Return condensate to boiler via

Yes Yes Ye s Yes Yes Yes No nonpressurized return line?

Return condensate by condensate

Yes Yes** Yes Yes** Yes Yes** Yes

pump?

Drain condensate to

Yes

†

Yes

†

Yes

†

Yes

†

Yes

†

Yes

†

Recommended

open drain?

Notes: * Trap may require priming after seasonal shutdown. ** DriSteem recommends using a stainless steel condensate pump when pumping condensate from systems using optional stainless steel components. *** During consistent load, there may not be enough steam pressure in the separator to lift condensate from the separator using steam. † If wasting condensate to drain, temper condensate to local code to prevent damage to drain plumbing.

mc_050211_1630

†

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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OVERVIEW

Temperature switches

FIGURE 16-1: PNEUMATIC TEMPERATURE SWITCH STANDARD LOCATION

Pneumatic airﬂow switch (optional)

Set point controlling humidistat

20 psi (138 kPa) air supply

Duct high limit Required 0.007" (0.18 mm) restrictor

humidistat

(optional)

Separator

12" (305 mm) min.

DC-1190

mc_051011_1650

Steam trap

FIGURE 16-2: PNEUMATIC TEMPERATURE SWITCH ALTERNATE LOCATION

12" (305 mm) min.

Pneumatic temperature switch

DC-1192 mc_051011_1651

Pneumatic temperature switch

Steam trap

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

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Temperature switches

PNEUMATIC TEMPERATURE SWITCH NOTES:

• DriSteem's pneumatic temperature switch, designed for use with a pneumatic control system, prevents condensate discharge from a steam injection humidiﬁer during cold start or if the condensate return main becomes ﬂooded. It accomplishes this by bleeding off the pneumatic signal from the controlling humidistat, preventing the pneumatic humidiﬁer valve from opening until the steam trap has reached operating temperature.

• The pneumatic temperature switch has a self-contained air valve operated by a thermal disc that is normally open, bleeding off control air pressure. When steam comes in contact with the thermal disc, the ﬂuid inside the disc expands, causing the air valve to close, thus allowing the pneumatic control system air pressure to build up and to actuate the steam control valve.

• Install the tee containing the pneumatic temperature switch in the condensate drainage pipe line between the separator and the inlet to the steam trap, as shown in the drawings on Pages 16 and 18.

mc_051011_1652

OVERVIEW

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 20

OVERVIEW

Temperature switches

FIGURE 18-1: ELECTRIC MODULATING TEMPERATURE SWITCH LOCATION

120 VAC primary

24 VAC secondary

Duct high limit humidistat (optional)

Airﬂow proving switch (optional)

Class 2 transformer (by installer) used with 24 VAC coil

Omit transformer when using 120 VAC coil

Steam trap

Electric modulating humidistat (optional) or control signal by others

Normally closed electric modulating valve (120 VAC or 24 VAC)

DC-1227 mc_051011_1653

12" (305 mm) min.

Electric temperature switch

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 21

Temperature switches

Electric temperature switches:

• The electric temperature switch prevents condensate discharge from a steam injection humidiﬁer during a cold start or if the condensate return main becomes ﬂooded. DriSteem's electric temperature switch is a temperatureactuated make-break switch designed for use with electric humidity control systems. The temperature at which it switches is adjustable and should be set at 210 °F (99 °C).

• This switch prevents condensate discharge from a steam injection humidiﬁer during a cold start or if the condensate return main becomes ﬂooded.

• Install the sensing element of the device in the condensate return piping on the inlet side of the steam trap (see drawings), including a tee with a ½" pipe thread (DN15) opening to receive the sensing element. When steam surrounds the sensing element, the switch will “make,” allowing the humidiﬁer valve to open.

OVERVIEW

• Install all wiring according to national and local electrical codes, and SIZE TRANSFORMER VA TO LOAD VA.

• When using the temperature switch with an electric modulating valve, use the special wiring instructions furnished with the valve.

mc_051011_1654

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 22

SINGLE-TUBE HUMIDIFIER

Conﬁgurations

FIGURE 20-1: SINGLE-TUBE HUMIDIFIER INSTALLATION CONFIGURATIONS

Steam inlet

Drain

Horizontal airﬂow

Horizontal tube/horizontal airflow

Typical conﬁguration. Single-tube humidiﬁers are shipped this way unless ordered otherwise. See Page 24 for more information about this conﬁguration. This is a right-hand conﬁguration; to change to a left hand conﬁguration, see Figure 20-1.

Vertical tube/horizontal airflow

Use this conﬁguration when there is

Steam inlet

Horizontal airﬂow

Drain

Steam inlet

no access to side of duct or when duct is tall and narrow, to improve steam absorption. See Page 27 for more information about this conﬁguration.

Horizontal tube/vertical airflow

Use this conﬁguration in vertical airﬂow ducts. See Page 26 for more information about this conﬁguration.

FIGURE 20-2: CHANGING FROM RIGHTHAND TO LEFT-HAND CONFIGURATION

Opposite connection

Elbow and union assembly

Union ring

OM-8

It may be necessary to change the steam discharge direction at the job site. To do so, follow these directions:

1. Non-threaded union ring.

2. Remove elbow and nipple assembly from dispersion tube and reinstall on opposite connection.

3. Rotate dispersion tube 180° with respect to separator.

4. Reconnect union halves and tighten union ring.

5. Humidifier now will discharge to opposite side.

Steam inlet

Drain

Steam inlet

Drain

Vertical airﬂow

Horizontal airﬂow

Vertical airﬂow

Horizontal separator/horizontal airflow

Use this conﬁguration when space is tight, such as when installing above ceilings. This application requires a separator designed for horizontal installation. See Page 25 for more information about this conﬁguration.

Horizontal separator/vertical airflow

Use this conﬁguration in vertical airﬂow ducts and when space is tight, such as when installing above ceilings. This application requires a separator designed for horizontal installation.

OM-380, 381, 382, 383, 7652

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 23

Assembly

FIGURE 21-1: SINGLE-TUBE HUMIDIFIER FIELD ASSEMBLY

SINGLE-TUBE HUMIDIFIER

Single-tube humidiﬁer

Actuator

Valve separator assembly

Steam trap

SINGLE-TUBE HUMIDIFIER FIELD ASSEMBLY

Tube adapter

Teﬂon® seal ring

Pipe union

Half coupling

O-rings

Hooks of silencer cage

Two-piece escutcheon plate

Strainer

Dispersion tube

Support bracket

Steam discharge tubelets

Detail: Tube adapter single dispersion tube

Tube adapter

Dispersion tube

Automatic valve

O-rings

Silencer cage

Silencer (tubes 48" [1219 mm] and shorter only)

OM-7, OM-14

Small units are shipped assembled; the following applies to larger units that are disassembled for shipment.

1. Unpack shipment and verify receipt of all components with packing list. Report any shortages at once.

2. Match up dispersion tube with its proper valve-separator assembly (tubes and separators are match-tagged). Tubelets should point against the airflow for better steam-air mixing, except if tubes have fiberglass insulated-jacket option, then tubelets should discharge steam with the airflow to prevent condensation from forming on cool jackets. See the installation examples on the following pages before beginning assembly. Note: Before completing Step 3, determine which way (right or left) tubelets should point, and install in appropriate half coupling (see Figure 4-1).

3. Unscrew pipe union, remove elbow and nipple portion, and install in half coupling of tube.

4. Install tube adapter in valve (use pipe dope) and tighten.

5. Lubricate O-rings and install inside tube adapter.

6. Insert tube adapter into dispersion tube. As this is being done, if unit has a silencer, squeeze hooks of silencer cage together and slide them into the tube adapter, allowing them to snap over rear edge of adapter. Complete inserting adapter into tube, being careful not to damage O-rings. Note: Unless special-ordered, silencers are furnished only with Model 60 and Model 70 tubes equal to or shorter than 48" (1219 mm), and only with black iron piping.

7. Tighten pipe union.

8. Thread Teflon seal ring into half coupling.

9. Torque Teflon seal ring to 15 ft-lbs (20.3 N-m). Note: Once tightened, do not attempt to re-tighten the Teflon seal, or the seal could be damaged.

10. Install the assembly in the duct. See “Installation” on the next page.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 24

SINGLE-TUBE HUMIDIFIER

Installation

1. Insert a support bolt in one of the support bracket’s three holes (upper, lower or end); cut holes in duct for inserting dispersion tube and support bolt.

2. Secure unit in duct with nut and support bolt. Mount twopiece escutcheon plate around tube and secure into duct with sheet metal screws. Where an airtight seal is required, use a suitable caulk around duct wall penetrations.

3. Install steam strainer and steam trap. Connect to steam and condensate return mains. See the drawings on the following pages and text below for detailed piping instructions.

4. Install control tubing (pneumatic) or wiring (electric) to valve actuator.

5. Install an airflow proving switch to prevent the valve from opening unless air is moving in duct. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

6. Install a duct-mounted high-limit humidistat downstream from the humidifier. Set humidistat at 80-90% RH to prevent condensation forming in duct. Mount this humidistat far enough downstream to ensure that injected steam has been completely absorbed before the humidistat. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

7. Install a temperature switch to prevent possible cold-start dripping when steam pressure to the humidifier is cycled. See “Temperature switches” on Pages 16 – 19 for more information.

8. Install the humidistat and/or sensors according to the recommendations on Page 9.

For more installation information

• See “Humidifier placement” on Pages 6 – 8 for information about choosing an installation location.

• See “Sensor placement” on Page 9.

• See “Pressurized steam piping guidelines” on Pages 10 – 13.

• See “Temperature switches” on Pages 16 – 19.

WARNING

Improper mounting hazard

Mount humidiﬁer per the instructions in this manual and to a structurally stable surface. Improper humidiﬁer mounting can cause the humidiﬁer to fall resulting in severe personal injury or death.

mc_060310_0725

WARNING

Excessive moisture hazard

DriSteem strongly recommends installing a duct airﬂow proving switch and a duct high limit humidistat. These devices prevent a humidiﬁer from making steam when there is low airﬂow in the duct or when the RH level in the duct is too high. Failure to install these devices can result in excessive moisture in the duct, which can cause bacteria and mold growth or dripping through the duct.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

mc_060310_0725

Page 25

Piping notes

1. Refer to field piping drawings on Pages 24 – 27.

2. To avoid metal fatigue, allow for thermal expansion of dispersion tube.

3. Dashed lines in drawings indicate provided by installer.

Horizontal airflow:

Slightly better mixing with less visible vapor travel occurs when discharged steam blows against the airflow, rather than with the airflow. Therefore, when using noninsulated steam jackets in a horizontal airflow (as shown in the piping drawings on Pages 24 – 27), position tubelets (steam orifices) so they face into the airflow. However, if the dispersion tube has an insulated jacket, the discharged steam must blow with the airflow to avoid condensation that may occur when discharged steam contacts the cooler insulated jacket. When using insulated steam jackets in a horizontal airflow, position tubelets so they discharge steam with the airflow, and add 24" (610 mm) to the nonwetting distance.

SINGLE-TUBE HUMIDIFIER

4. Vertical airflow:

Always position tubelets (steam orifices) pointing up when installing in a vertical airflow. Important: If installing insulated steam jackets in a vertical airflow, install only in an upflow application and add 24" (610 mm) to the non-wetting absorption distance. Do not install insulated steam jackets in a vertical

downflow application.

5. For horizontal tube installations, center tube within duct height. For vertical tube installations, center tube within duct width.

6. If steam pressure is less than or equal to 15 psi (103.4 kPa), use a float and thermostatic (F&T) trap for the humidifier. If steam pressure is greater than 15 psi (103.4 kPa), use an inverted bucket trap for the humidifier. If lifting condensate, use an inverted bucket trap and check valve regardless of steam pressure (see Figure 12-1).

7. See also the “Pressurized steam piping guidelines” on Pages 10 – 13.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 26

SINGLE-TUBE HUMIDIFIER

Field piping

FIGURE 24-1: SINGLE-TUBE HUMIDIFIER WITH HORIZONTAL DISPERSION TUBE AND VERTICAL SEPARATOR INSTALLED IN A HORIZONTAL AIRFLOW

Piping downstream from strainer

Isolation valve (by others)

From steam source

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

3/4" pipe thread (DN20)

Separator trap (see Note 5)

should be the same size as strainer.

Separator

Condensate drain

Steam valve and actuator (see Note 4)

Airﬂow

12" (305 mm) min.

4" (100 mm) min.

Drip

Secure and seal escutcheon plates

Level

Dispersion tube with noninsulated steam jacket (see Note 4 on Page 23)

Minimum face height 9" (229 mm)

Secure end of tube to duct using support bracket (0.42" [11 mm] dia. holes in top, bottom, and end of bracket)

DC-1065

mc_050511_1100

NOTES:

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. 2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Piping notes” on Page 23, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 27

Field piping

FIGURE 25-1: SINGLE-TUBE HUMIDIFIER WITH HORIZONTAL DISPERSION TUBE AND HORIZONTAL SEPARATOR INSTALLED IN A HORIZONTAL AIRFLOW

SINGLE-TUBE HUMIDIFIER

From steam source

Piping downstream from strainer should be same size as strainer.

Steam valve and actuator (see Note 4)

Separator

3/4" pipe thread (DN20)

Trap (see Note 7 on Page

23)

Isolation valve (by others)

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

12" (305 mm) min.

Level

Secure end of tube to duct using support bracket (0.42" [11 mm] dia. holes in top, bottom, and end of bracket)

Duct

Dispersion tube with noninsulated steam jacket (see Note 4 on Page 23)

Airﬂow

Secure and seal escutcheon plates

Minimum duct width 9" (229 mm)

DC-1066 mc_050911_1600

Condensate drain

4" (100 mm) min.

Drip

NOTES:

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Piping notes” on Page 23, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 28

SINGLE-TUBE HUMIDIFIER

Field piping

FIGURE 26-1: HORIZONTAL DISPERSION TUBE INSTALLED IN A VERTICAL AIRFLOW

From steam source

Piping downstream from strainer should be same size as strainer.

Steam valve and actuator (see Note 4)

Isolation valve (by others)

Secure and seal escutcheon plates

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Level

Tubelets (steam oriﬁces) always point up with vertical airﬂow. Do not install insulated jackets in vertical downﬂow applications. See Note 5 on Page 23.

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of bracket)

Duct (minimum duct height is 9" [229 mm])

Dispersion tube

DC-1067 mc_051011_0805

NOTES:

3/4" pipe thread (DN20)

Trap (see Note 7 on Page

23)

Condensate drain

Separator

Airﬂow

12" (305 mm) min.

4" (100 mm) min.

Drip

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Piping notes” on Page 23, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 29

Field piping

FIGURE 27-1: VERTICAL DISPERSION TUBE INSTALLED IN A HORIZONTAL AIRFLOW

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in both sides and end of bracket)

SINGLE-TUBE HUMIDIFIER

From steam source

Piping downstream from strainer should be same size as strainer.

3/4" pipe thread (DN20)

Trap (see Note 7 on Page 23)

Isolation valve (by others)

Separator

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Condensate drain

Drip

12" (305 mm) min.

4" (100 mm) min.

Duct (minimum duct width is 9" [229 mm])

Airﬂow

DC-1068 mc_051011_0830

Steam valve and actuator (see Note 4)

Dispersion tube with noninsulated steam jacket (see Note 4 on Page 23)

Secure and seal escutcheon plates

NOTES:

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Piping notes” on Page 23, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 30

MULTIPLE-TUBE HUMIDIFIER

Field assembly

Note: For Maxi-bank option, follow the “Maxi-bank option ﬁeld assembly and

installation” instructions on Page 36.

1. Unpack shipment and verify receipt of all components with packing list. Report any shortages at once.

2. Plan the tube bank. You need to know the required spacing distance between tubes. See Table 29-1. Arrange tubes so steam will discharge against the airflow, unless tubes are insulated (optional), in which case they should blow with the air to prevent condensation on metal jacket covering insulation.

3. Assemble header based on spacings determined in Step 2 above. If header pipe size has not been specified, see Table 28-1. This table is based on a maximum steam velocity of 7,000 to 10,000 fpm (36 to 51 m/s), which will result in lower noise levels and produce uniform steam flow from all tubes. If noise level is not important or a uniform flow is not critical, a smaller header size may be used.

4. Install tube adapter fittings in header tees. (See Figure 28-1.) It usually works best to lay the header on the floor along with the tubes for Steps 5 – 7.

5. Install male pipe thread end of tube adapter into pipe fitting. Dope threads and tighten leak tight sealer.

6. O-rings are installed inside of tube adapter. NOTE: Use synthetic oil to lubricate O-rings before installing.

7. Insert tube adapter into dispersion tube. As this is being done, if unit has a silencer, squeeze hooks of silencer cage together and slide them into tube adapter, allowing them to snap over rear edge of adapter. Complete inserting adapter into tube, being careful not to damage O-rings. NOTE: Unless special-ordered, silencers are furnished only with Model 60 and Model 70 tubes equal to or shorter than 48" (1219 mm), and only with black iron piping.

8. Slide tube into adapter being careful not to damage O-rings.

FIGURE 28-1: TUBE ADAPTER FOR MULTIPLE-TUBE HUMIDIFIERS

Header tee (by installer)

Tube adapter

Use the tube adapter to connect a non-threaded tube to a threaded pipe ﬁtting.

O-rings

Dispersion tube

OM-15

Table 28-1: Multiple-tube humidifier header

sizes

Total capacity Header size

lbs/hr kg/h inches DN

up to 280 up to 127 1.5* 38*

up to 490 up to 222 2.0 50

491 to 980 223 to 444 3.0 80 981 to

1743 1744 to

2752 2753 to

3989 * Non Maxi-bank only

mc_040710_1005

445 to 790 4.0 100

791 to 1248 5.0 125

1249 to 1809 6.0 150

9. Install tubes in adapter fittings, making sure tubelets are pointing in proper direction.

10. Cut to length, thread, and install steam jacket piping. NOTE: When the total tube length of dispersion tubes exceeds 45' (13.7 m), we recommend installing an additional steam inlet to the dispersion tubes and an additional steam jacket trap. One for each additional 45' of total tube length. Divide the tubes into equal groups. See Figures 32-1 and 35-1.

11. Make tube support strut using angle or channel iron, and bolt each tube end in place.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 31

Installation

MULTIPLE-TUBE HUMIDIFIER

NOTE: For Maxi-bank option, follow the “Maxi-bank option ﬁeld assembly and installation” instructions on Page 36.

1. Insert a support bolt in one of the three holes (upper, lower or end) of the support brackets; cut holes in duct for inserting dispersion tube and support bolt.

2. Secure unit in duct with nuts and support bolts. Mount two-piece escutcheon plate around each tube and secure into duct with sheet metal screws. Where an airtight seal is required, use a suitable caulk around duct wall penetrations.

3. Install steam strainer and steam trap. Connect to steam and condensate return mains. See the drawings on the following pages and text on the next for detailed piping instructions.

4. Install control tubing (pneumatic) or wiring (electric) to valve actuator.

5. Install an airflow proving switch to prevent the valve from opening unless air is moving in duct. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

7. Install a temperature switch to prevent possible cold-start dripping when steam pressure to the humidifier is cycled. See “Temperature switches” on Pages 16 – 19 for more information.

8. Install the humidistat and/or sensors according to the recommendations on Page 9.

Table 29-1: Multiple-tube humidifier minimum tube spacing

For more installation information

• See “Humidifier placement” on Pages 6 – 8 for information about choosing an installation location.

• See “Sensor placement” on Page 9.

• See “Pressurized steam piping guidelines” on Pages 10 – 13.

• See “Temperature switches” on Pages 16 – 19.

• See the Maxi-bank option beginning on Page

36.

WARNING

Improper mounting hazard

mc_060310_0725

WARNING

Excessive moisture hazard

mc_060310_0725

Tube

model

60 6 152 9 229

70 9 229 9 229

80 9 229 12 305

* See Multiple-tube humidiﬁer drawings on the following pages for center-to-

center distance X.

mc_040710_1030

Minimum tube spacing (X*)

Multiple-tube humidiﬁer

inches mm inches mm

Minimum tube spacing (X*)

Multiple-tube humidiﬁer with op-

tional stainless steel piping

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 32

MULTIPLE-TUBE HUMIDIFIER

Piping notes

NOTE: For Maxi-bank option, see the “Maxi-bank option piping notes” on Page

36.

1. Refer to piping drawings on Pages 31 through 35.

2. See also the “Pressurized steam piping guidelines” on Pages 10 through 13.

3. Slightly better mixing with less visible vapor travel occurs when discharged steam

blows against the airflow, rather than with the airflow. Therefore, when using

noninsulated steam jackets in a horizontal airflow (as shown in the drawings),

position dispersion tubelets (steam orifices) so that they face into the airflow. If the dispersion tube has an insulated jacket, the discharged steam must blow with the airflow to avoid condensation that may occur when discharged steam contacts the cooler insulated jacket. Therefore, when using insulated steam jackets in a

horizontal airflow, position dispersion tubelets so that they discharge steam with

the airflow, and also add 24" (610 mm) to the non-wetting absorption distance.

4. Jacket piping size:

• 1/2" pipe thread (DN15) for Model 60 tubes

• 3/4" pipe thread (DN20) for Model 70 tubes

• 1½" pipe thread (DN40) for Model 80 tubes

5. To ensure uniform output from each tube, connect steam supply as close to the middle of the header as possible, but not in direct alignment with a dispersion tube.

For total dispersion tube lengths of more than 45’ (13.7 m), see Step 10 note on Page 28.

6. See header sizing in Table 28-1.

7. After the unit is installed, secure steam jacket piping to the tube header.

8. If steam pressure is less than or equal to 15 psi (103.4 kPa), use float and thermostatic (F&T) traps for the humidifier. If steam pressure is greater than 15 psi (103.4 kPa), use inverted bucket traps for the humidifier. If lifting condensate, use an inverted bucket trap and check valve regardless of steam pressure (Figure 12-1).

9. Due to the pressure drop across the valve, the steam pressure at the header trap is minimal; therefore, you cannot lift condensate or return condensate to a pressurized return by steam pressure from this trap. However, with condensate free steam, no trap is required if load is less than 500 pph, and between 500 and 1000 pph a trap is optional. Above 1000 pph, a trap is recommended.

10. X = distance between tubes, center to center Y = clearance at top and bottom = at least 1/2 of X or 4½" (114 mm), whichever is greater, but not greater than X See the minimum tube spacing in Table 29-1.

11. When installing in a vertical airflow: Always point tubelets (steam orifices) up when installing in a vertical airflow.

Important: If installing insulated steam jackets in a vertical airflow, install only in an upflow application and add 24" (610 mm) to the non-wetting absorption distance. Do not install insulated steam jackets in a vertical downflow application.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 33

Field piping

FIGURE 31-1: MULTIPLE-TUBE HUMIDIFIER, TOTAL TUBE LENGTH LESS THAN OR EQUAL TO 45' (13.7 M)

MULTIPLE-TUBE HUMIDIFIER

Steam jacket piping (see Note 4 on Page 30)

Isolation valve (by others)

From steam source

Same size as separator inlet

Tube adapter

See header sizes in Table 28-1

Steam valve and actuator (see Note 4)

Separator

3/4" pipe thread (DN20)

12" (305 mm) min.

Separator trap (see Note 8 on Page 30)

4" (100 mm) min.

Header trap by installer (See Note 9 on Page 30)

Steam jacket trap (see Note 8 on Page 30)

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Header (see Table 28-1)

4" (100 mm) min.

Level

Escutcheon plate

Dispersion tubes (see Note 3 on Page 30)

See Note 7 on Page 30

Dispersion tube header (insulated)

Secure and seal escutcheon plates

12" (305 mm) min.

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of bracket)

y = 4½" (114 mm) min.

Center assembly in duct. See Note 10 on Page 30.

x (See Table 29-1

for minimum tube spacing)

y (see y note above)

DC-1070 mc_040611_1225

Notes:

1. To avoid metal fatigue, allow for thermal expansion of dispersion tubes.

2. Dashed lines indicate provided by installer (see Maxi-bank option beginning on Page 36). Right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 34

MULTIPLE-TUBE HUMIDIFIER

Field piping

FIGURE 32-1: MULTIPLE-TUBE HUMIDIFIER, TOTAL TUBE GREATER THAN 45' (13.7 M)

Steam jacket piping (see Note 4 on Page 30)

Isolation valve (by others)

From steam source

Same size as separator inlet

Tube adapter

See Notes 5 and 7 on Page 30

Steam valve and actuator (see Note 4)

Separator

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Header (see Table 28-1)

Level

Escutcheon plate

Dispersion tubes (see Note 3 on Page 30)

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of bracket)

y = 4½" (114 mm)

min. Center assembly in duct. See Note 10 .

x (See Table

29-1 for minimum tube spacing)

3/4" pipe thread (DN20)

Separator trap (see Note 8 on Page 30)

Steam jacket trap (see Note 8 on Page 30)

NOTES:

12" (305 mm) min.

4" (100 mm) min.

Header trap by installer (see Note 9 on Page 30)

4" (100 mm) min.

Second inlet

Dispersion tube header (insulated)

DC-1071

Secure and seal escutcheon plates

12" (305 mm) min.

y (see y note above)

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer (see Maxi-bank option beginning on Page 36). Right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Piping notes” on Page 30, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 35

Field piping

FIGURE 33-1: MULTIPLE-TUBE HUMIDIFIER INSTALLED IN A VERTICAL AIRFLOW

MULTIPLE-TUBE HUMIDIFIER

Duct

Secure and seal escutcheon plates

Steam valve and actuator (see Note 4)

See Note 4 on Page 30

Isolation valve (by others)

From steam

source Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Same size as separator inlet

Separator

Trap

Condensate return

Airﬂow (see Note 11 on Page 30)

Level

See Note 7 on Page 30

See Note 2 on Page 30

See Note 9 on Page 30

Pitch header 1/8"/ft (1%) toward header trap drain

See Table 29-1 for minimum tube spacing (x). See Note 10 on Page 30.

y = 4½" (114 mm) min.

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in sides and end)

Dispersion tube (see Note 11 on Page 30)

Center assembly in duct. See Note 10 on Page

30.

DC-1074 mc_051011_0902

Notes:

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer (see Maxi-bank option beginning on Page 36). Right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Piping notes” on Page 30, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 36

MULTIPLE-TUBE HUMIDIFIER

Field piping

FIGURE 34-1: MULTIPLE-TUBE HUMIDIFIER WITH TOTAL TUBE LENGTH LESS THAN OR EQUAL TO 45' (13.7 M) IN A AHU

Steam jacket piping (see Note 4 on Page 30)

Secure end of tube to AHU using support bracket (0.421” dia. [11 mm] holes in top, bottom, and end of bracket)

y = 4½" (114 mm)

min. Center assembly in duct. See Note 10 on Page

30.

Isolation valve (by others)

From steam source

Same size as separator inlet

Tube adapter

See Note 5 on Page 30

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Level

Steam valve and actuator (see Note 4)

Separator

3/4" pipe thread (DN20)

12" (305 mm) min.

Separator trap (see Note 8 on Page 30)

4" (100 mm) min.

Header trap by installer (see Note 9 on Page 30)

Steam jacket trap (see Note 8 on Page 30)

NOTES:

Dispersion tubes (see Note 3 on Page 30)

See Note 7 on Page 30

Dispersion tube header (insulated) (see Table 28-1)

12” (305 mm) min.

4" (100 mm) min.

DC-1204 mc_050511_1455

x (See Table

29-1 for minimum tube spacing)

y (see y note above)

1. To avoid metal fatigue, allow for thermal expansion of dispersion tubes.

2. Dashed lines indicate provided by installer (see Maxi-bank option beginning on Page 36). Right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See Pages 14 and 15 for more information about trap types and piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 37

MULTIPLE-TUBE HUMIDIFIER

Field piping

FIGURE 35-1: MULTIPLE-TUBE HUMIDIFIER WITH TOTAL TUBE LENGTH GREATER THAN 45' (13.7 M) IN A AHU

Steam jacket piping (see Note 4 on Page 30)

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Isolation valve (by others)

From steam source

Same size as separator inlet

Tube adaptor

See Note 7 on Page 30

Steam valve and actuator (see Note 4)

Separator

Steam jacket trap (see Note 8 on Page 30)

4" (102 mm) min.

Level

Dispersion tubes (see

Note 3 on Page 30

Secure bracket to duct using 0.375" (9.5 mm) dia. holes in end of bracket

y = 4½" (114 mm)

x (See Table

)

min. Center assembly in duct. See Note 10 on Page

30.

29-1 for minimum tube spacing)

12" (305 mm) min.

3/4”pipe thread (DN20)

Separator trap (see Note 8 on Page 30)

Header trap (see Note 9 on Page 30)

Steam jacket trap (see Note 8 on Page 30)

NOTES:

4" (102 mm) min.

Second inlet

Dispersion tube header (insulated) (see Table 28-1)

12" (305 mm) min.

DC-1205

mc_040711_1705

y (see y note above)

1. To avoid metal fatigue, allow for thermal expansion of dispersion tubes.

2. Dashed lines indicate provided by installer (see Maxi-bank option beginning on Page 36). Right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See Pages 14 and 15 for more information about trap types and piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 38

MAXI-BANK HUMIDIFIER

Maxi-bank option ﬁeld assembly and installation

The Maxi-bank humidiﬁer’s header piping and steam-jacket piping are provided by DriSteem. The Maxi-bank is factory assembled and shipped intact, except for larger units that are broken down for shipment. If the unit you are installing is already assembled, skip installation steps that do not apply.

1. Unpack shipment and verify receipt of all Maxi-bank components with packing list. Report any shortages at once.

2. To simplify installation, we recommend that dispersion tubes be attached to the Maxi-bank header before dispersion tubes and header are installed in a duct or air handler.

3. Follow the pre-tagged component lettering and match up dispersion tubes (or tube sections) to their proper location on the Maxi-bank header.

4. Install each dispersion tube into its appropriate tube adapter on the header, being sure to lubricate O-rings in the tube adapters.

5. Proceed with the additional tubes. Bring the jacketed union halves together and secure unions by hand.

NOTE: When the total tube length of dispersion tubes

exceeds 45' (13.7 m), we recommend installing an additional steam inlet to the dispersion tubes and an additional steam jacket trap. One for each additional 45' of total tube length. Divide the tubes into equal groups. See Figures 41-1 and 43-1.

6. When all the dispersion tubes are assembled, place the tube assembly into the duct or air handler, securing the assembly and tube ends to the duct or a fabricated structure. Install tubes level.

For more installation information

• See “Humidifier placement” on Pages 6 – 8 for information about choosing an installation location.

• See “Sensor placement” on Page 9.

• See “Pressurized steam piping guidelines” on Pages 10 – 13.

• See “Temperature switches” on Pages 16 – 19.

WARNING

Improper mounting hazard

WARNING

Excessive moisture hazard

7. Position and secure header, then tighten interconnecting tube jacket unions. When installing into a duct, use the two-piece escutcheon plates around each tube and secure to duct with sheet metal screws. In duct applications where air tightness is required, seal around tube and bolts with suitable caulk.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 39

Maxi-bank option ﬁeld assembly and installation

8. Locate and install separator/valve assembly to Maxi-bank mating union on header and tighten union.

9. Install strainer and necessary steam traps. Connect assembly to steam and condensate mains.

10. Install control tubing (pneumatic) or wiring (electric) to valve actuator.

11. Install an airflow proving switch to prevent the valve from opening unless air is moving in duct. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

12. Install a duct-mounted high-limit humidistat downstream from the humidifier. Set humidistat at 80-90% RH to prevent condensation forming in the duct. Mount this humidistat far enough downstream to ensure that injected steam has been completely absorbed before the humidistat. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

MAXI-BANK HUMIDIFIER

13. Install a temperature switch to prevent possible cold-start dripping when steam pressure to the humidifier is cycled. See “Temperature switches” on Pages 16 – 19 for more information.

14. Install the humidistat and/or sensors according to the recommendations on Page 9.

15. Pressure test system, and secure fittings as necessary.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 40

MAXI-BANK HUMIDIFIER

Maxi-bank option piping notes

1. Refer to piping drawings on Pages 40 – 44.

2. Dashed lines in drawings indicate provided by installer.

3. For total dispersion tube lengths of more than 45' (13.7 m), see Step 5 note Page 36.

4. When installing in a horizontal airflow: Slightly better mixing with less visible vapor travel occurs when discharged steam blows against the airflow, rather than with the airflow. Therefore, when using

noninsulated steam jackets in a horizontal airflow (as

shown in the drawings on Pages 40 – 43), position dispersion tubelets (steam orifices) so that they face into the airflow. If the dispersion tube has an insulated jacket, the discharged steam must blow with the airflow to avoid condensation that may occur when discharged steam contacts the cooler insulated jacket. Therefore, when

using insulated steam jackets in a horizontal airflow,

position dispersion tubelets so that they discharge steam with the airflow, and also add 24" (610 mm) to the nonwetting absorption distance.

5. When installing in a vertical airflow:

Always point tubelets (steam orifices) up with vertical

airflow. Important: If installing insulated steam jackets in a vertical airflow, install only in an upflow application and add 24" (610 mm) to the non-wetting absorption distance. Do not install insulated steam jackets in a vertical downflow application.

6. Jacket piping size:

• 1/2" pipe thread (DN15) for Model 60 tube(s)

• 3/4" pipe thread (DN20) for Model 70 tube(s)

• 1½" pipe thread (DN40) for Model 80 tube(s)

7. After the unit is installed, secure steam jacket piping to the tube header.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 41

Maxi-bank option piping notes

9. The header trap is required to collect condensate from the header assembly. Due to the pressure drop across the valve, the steam pressure at the header trap is minimal; therefore, you cannot lift condensate by steam pressure, or return condensate to a pressurized return, from this trap. On small headers (2" or less in diameter), this trap may be omitted.

10. X = distance between tubes, center to center Y = clearance at top and bottom = at least ½ X or 4½" (114.3 mm), whichever is greater, but not greater than X See the “Minimum tube spacing distance” table on Page 38.

MAXI-BANK HUMIDIFIER

11. See “Pressurized steam piping guidelines” on Pages 10 – 13.

12. Drawings represent right-hand discharge.

13. See Table 28-1 for header sizing.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 42

MAXI-BANK HUMIDIFIER

Maxi-bank option ﬁeld piping

FIGURE 40-1: MAXI-BANK OPTION, TOTAL TUBE LENGTH LESS THAN OR EQUAL TO 45' (13.7 M)

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of

Isolation valve (by others)

From steam source

Same size as separator inlet

Factory-supplied header and interconnecting piping

See Table 28-1

Steam valve and actuator (see Note 4)

Separator

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Mounting bracket

Steam jacket piping (See Note 6 on Page 38)

Level

Escutcheon plate

Dispersion tubes (see Note 4

on Page 38

bracket)

)

y = 4½" (114 mm)

min. Center assembly in duct. See Note

10 on Page

39.

x (See Table

29-1 for minimum tube spacing)

3/4" pipe thread (DN20)

12" (305 mm) min.

Trap (See Note 8 on Page 39)

4" (100 mm) min.

Header trap by installer (see Note 9 on Page 39)

Steam jacket trap (see Note 8 on Page 39)

NOTES:

4" (100 mm) min.

See Note 7 on Page 38

DC-1072 mc_040611_1550

Secure and seal escutcheon plates

12" (305 mm) min.

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Maxi-bank option piping notes” on Pages 38 and 39, and see Pages 14 and 15 for more information about trap types and trap piping.

y (see y note above)

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 43

Maxi-bank option ﬁeld piping

FIGURE 41-1: MAXI-BANK OPTION, TOTAL TUBE LENGTH GREATER THAN 45' (13.7 M)

MAXI-BANK HUMIDIFIER

Isolation valve (by others)

From steam source

Same size as separator inlet

Factory-supplied header and interconnecting piping

See Table 28-1

See Note 7 on Page 38

Steam valve and actuator (see Note 4)

Separator

3/4" pipe thread (DN20)

12" (305 mm) min.

Trap (See Note 8 on Page 39)

4" (100 mm) min.

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Mounting bracket

Steam jacket piping (See Note 6 on Page 38)

Level

Escutcheon plate

Dispersion tubes (see Note 4 on Page 38)

Second inlet

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of bracket)

y = 4½" (114 mm)

min. Center assembly in duct. See Note

10 on Page

39.

x (See Table

29-1 for minimum tube spacing)

y (see y note above)

Header trap by installer (see Note 9 on Page 39)

Steam jacket trap (see Note 8 on Page 39)

NOTES:

4" (100 mm) min.

12" (305 mm) min.

Secure and seal escutcheon plates

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Maxi-bank option piping notes” on Pages 38 and 39, and see Pages 14 and 15 for more information about trap types and trap piping.

DC-1073 mc_051011_1018

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 44

MAXI-BANK HUMIDIFIER

Maxi-bank option ﬁeld piping

FIGURE 42-1: MAXI-BANK OPTION, TOTAL TUBE LENGTH LESS THAN OR EQUAL TO 45' (13.7 M) IN AN AHU

Isolation valve (by others)

From steam source

Same size as separator inlet

Factory-supplied header and interconnecting piping

See Table 28-1

Steam valve and actuator (see Note 4)

Separator

3/4" pipe thread (DN20)

12" (305 mm) min.

Separator trap (See Note 8 on Page 39)

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Mounting bracket

Steam jacket piping (See Note 6 on Page 38)

Level

Dispersion tubes (see Note 4

See Note 7 on Page 38

on Page 38

Secure end of tube to AHU using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of bracket)

y = 4½" (114 mm)

min. Center assembly in duct. See Note 10 on Page 39.

x (See Table

29-1 for minimum tube spacing)

)

4" (100 mm) min.

Header trap by installer (see Note 9 on Page 39)

Steam jacket trap (see Note 8 on Page 39)

12" (305 mm) min.4" (100 mm) min.

NOTES:

DC-1207

mc_050511_1456

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Maxi-bank option piping notes” on Pages 38 and 39, and see Pages 14 and 15 for more information about trap types and trap piping.

y (see y note above)

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 45

Maxi-bank option ﬁeld piping

FIGURE 43-1: MAXI-BANK OPTION, TOTAL TUBE LENGTH GREATER THAN 45' (13.7 M) IN AN AHU

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Isolation valve (by others)

From steam source

Same size as separator inlet

Factory-supplied header and interconnecting piping

See Table 28-1

Mounting bracket

Steam jacket piping (See Note 6 on Page 38)

Level

MAXI-BANK HUMIDIFIER

Secure end of tube to AHU using support bracket (0.421" dia. [11 mm] holes in top, bottom, and end of bracket)

y = 4½" (114 mm)

min. Center assembly in duct. See Note 10 on Page 39.

See Note 7 on Page 38

Steam valve and actuator (see Note 4)

Separator

3/4" pipe thread (DN20)

12" (305 mm) min.

Separator trap (See Note 8 on Page 39)

4" (100 mm) min.

Header trap by installer (see Note 9 on Page 39)

Steam jacket trap (see Note 8 on Page 39)

4" (100 mm) min.

NOTES:

Dispersion tubes (see Note 4 on Page 38)

Second inlet

12" (305 mm) min.

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

DC-1208 mc_050511_1457

x (See Table

29-1 for minimum tube spacing)

y (see y note above)

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Maxi-bank option piping notes” on Pages 38 and 39, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 46

MAXI-BANK HUMIDIFIER

Maxi-bank option ﬁeld piping

FIGURE 44-1: MAXI-BANK OPTION INSTALLED IN A DUCT VERTICAL AIRFLOW

See Table 29-1 for minimum tube spacing (x). See Note 10 on Page 39.

y = 4½" (114 mm) min.

Center assembly in duct. See Note 10 on Page 39.

See Note 2 on Page 38

Isolation valve (by others)

Pipe size same as inlet to separator

From steam source

Secure end of tube to duct using support bracket (0.421" dia. [11 mm] holes in both sides and end of bracket)

Level

Install strainer within 3' (1 m) of humidiﬁer (see Note 4)

Trap (see Note 8 on Page 39)

Airﬂow (see Note 5 on Page 38)

Dispersion tube (see Note 5 on Page 38)

Secure and seal escutcheon plates

See Note 2 on Page 38

Header trap (see Note 9 on Page 39)

Valve

Pitch supply header 1/8"/ft (1%) toward drain

Separator

See Note 7 on Page 38

NOTES:

1. To avoid metal fatigue, allow for dispersion tube thermal expansion.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Dri-calc is DriSteem’s free sizing and selection software available at www.dristeem.com.

4. Steam valve and strainer sizes are provided by Dri-calc (Note 3).

5. See “Maxi-bank option piping notes” on Pages 38 and 39, and see Pages 14 and 15 for more information about trap types and trap piping.

mc_040711_1805

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

DC-1075

Page 47

Assembly and installation

MINI-BANK HUMIDIFIER

The Mini-bank humidiﬁer is a pre-engineered and preassembled header/tube assembly with tubes that are always 3" (76.2 mm) on center. The number of tubes depends upon the duct height. For best mixing, the tubes should span at least 90% (preferably 100%) of the duct width.

1. Unpack shipment and verify receipt of all components with packing list. Two F&T traps and one wye strainer are shipped loose for field installation. Report any shortages at once.

2. The Mini-bank can be configured to discharge steam against or with the airflow: Position the tube bank assembly at the desired orientation, slide the tube bank through the opening in the duct wall, join the tube bank assembly to the separator/valve assembly, and tighten the union.

3. Slightly better mixing with less “fog travel” results when the steam blows against the airflow. If the insulated jacket option has been supplied, the steam must blow with the airflow to avoid steam contacting and condensing on the metal jacket.

For more installation information

• See “Humidifier placement” on Pages 6 – 8 for information about choosing an installation location.

• See “Sensor placement” on Page 9.

• See “Pressurized steam piping guidelines” on Pages 10 – 13.

• See “Temperature switches” on Pages 16 – 19.

WARNING

Improper mounting hazard

mc_060310_0725

4. If a field change is necessary, loosen the union, and rotate the tube bank manifold, and tighten the union.

5. Install the Mini-bank humidifier in the duct, positioning the assembly so the tube bank is perpendicular to the top and bottom of the duct and level across the duct. Support the dispersion tube bank out-board end with a No. 10-32 bolt. To secure the Mini-bank escutcheon plate air tight, seal around the plate and fastener with suitable caulk.

6. Install the steam strainer, taking the steam supply to the Mini-bank humidifier off the top of steam main (instead of the side or bottom) to ensure the driest steam. The main should be dripped and trapped. See “Pressurized steam piping guidelines” on Pages 10 – 13.

7. Locate and install the steam traps as necessary. The Mini-bank humidifier steam traps should drain by gravity to return main having little or no back pressure. If condensate cannot drain by gravity, it must be elevated to return main (see Page 11).

Continued

WARNING

Excessive moisture hazard

mc_060310_0725

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 48

MINI-BANK HUMIDIFIER

Installation

8. Install control tubing (pneumatic) or wiring (electric) to valve actuator.

9. Install an airflow proving switch to prevent the valve from opening unless air is moving in duct. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

10. Install a duct-mounted high-limit humidistat downstream from the humidifier. Set humidistat at 80-90% RH to prevent condensation forming in the duct. Mount this humidistat far enough downstream to ensure that injected steam has been completely absorbed before the humidistat. See “Humidifier placement” on Pages 6 – 8 for location recommendations.

11. Install a temperature switch to prevent possible cold-start dripping when steam pressure to the humidifier is cycled. See “Temperature switches” on Pages 16 – 19 for more information.

12. Install the humidistat and/or sensors according to the recommendations on Page 9.

Table 46-1: Mini-bank humidifier specifications

Face height

inches mm

6-9 150-230 2

10-12 250-305 3

13-15 330-380 4

16-18 405-460 5

19-21 480-535 6

22-24 560-610 7

Note: See Figure 47-1 for face height and face width.

mc_081108_1455

Required number of tubes Face width Shipping weights

6" to 48" in 1/2" increments (150 mm to 1220 mm in 13-mm increments) For face dimensions larger than 48" × 24" (w x h) (1220 mm x 610 mm), use Multiple-tube humidiﬁer.

Tubes:

0.3 lbs per tube foot (0.4 kg per tube meter) Remaining components (separator, valve, traps, etc.): 8.5 lbs (3.8 kg)

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 49

Field piping

FIGURE 47-1: MINI-BANK HUMIDIFIER IN A DUCT HORIZONTAL AIRFLOW

Isolation valve (by others)

From steam source

Install strainer within 3' (1 m) from humidiﬁer. Piping downstream from strainer should be same size as strainer.

Valve

1/2” Pipe thread (DN15) steam jacket inlet

Union

Face width

1.5" (38 mm)

Level

MINI-BANK HUMIDIFIER

10-32 (M5) tapped hole to attach dispersion end to duct

Face height

Separator

1/2" pipe thread (DN15) inlet

12" (305 mm) min.

4" (100 mm) min.

Separator trap

NOTES:

12"

(305 mm)

min.

Condensate returns

3/4" pipe thread (DN20)

4" (100 mm) min.

1/2" pipe thread (DN15)

Steam jacket trap

Dispersion tube

Escutcheon plates ﬁt around tubes. Secure and seal moveable escutcheon plates (plates can be mounted within limits of 1½” [38 mm]).

OM-7480

1. To avoid metal fatigue, allow for thermal expansion of dispersion tubes.

2. Dashed lines indicate provided by installer; right-hand discharge shown.

3. Drawing represents a left-hand discharge.

4. Slightly better mixing with less visible vapor travel occurs when discharged steam blows against the airflow, rather

than with the airflow. Therefore, when using noninsulated steam jackets in a horizontal airflow, position dispersion tubelets (steam orifices) so that they face into the airflow. If the dispersion tube has an insulated jacket, the discharged steam must blow with the airflow to avoid condensation that may occur when discharged steam contacts the cooler insulated jacket. Therefore, when using insulated steam jackets in a horizontal airflow, position dispersion tubelets so that they discharge steam with the airflow, and also add 24" (610 mm) to the non-wetting absorption distance.

5. Center tube assembly within duct height.

6. If steam pressure is less than or equal to 15 psi (103.4 kPa), use float and thermostatic (F&T) traps for the humidifier. If steam pressure is greater than 15 psi (103.4 kPa), use inverted bucket traps for the humidifier. If lifting condensate, use an inverted bucket trap and check valve regardless of steam pressure. (see Figure 12-1)

7. See the previous page for face width and face height dimensions.

8. See “Pressurized steam piping guidelines” on Pages 10 – 13.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 50

AREA-TYPE HUMIDIFIER

Installation

ASSEMBLY AND INSTALLATION

Area-type humidiﬁers are factory assembled and shipped as a complete unit, with steam trap and wye strainer shipped loose. Each humidiﬁer requires a steam supply, condensate return, and electrical supplies to operate the fan.

1. Select a location using Table 50-1.

2. Unpack shipment and verify receipt of all Area-type humidifier components with packing slip. Report any shortages at once.

3. Mount humidifier to supported steam and condensate piping as necessary.

4. Connect fan power as recommended for a minimum 60 lbs/hr (27.2 kg/h) of steam: 120v, 60 hz, below 1 amp. The fan will provide 700 cfm (0.33 m3/s) of air.

WARNING

Improper mounting hazard

mc_060310_0725

5. Connect the necessary control signal wiring to steam valve operator.

Note: Recommended maximum steam supply pressure is

15 psi (105 kPa). If pressure is greater than this, consult factory.

6. See components and installation drawing in Figure 39-1.

7. See “Sensor placement” on Page 9.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 51

Field piping

AREA-TYPE HUMIDIFIER

FIGURE 49-1: AREA-TYPE HUMIDIFIER COMPONENTS AND INSTALLATION OVERVIEW

Three-speed fan

Strainer (see Note 3)

From steam source

Steam valve and actuator (see Note 3)

Internal bafﬂe plate

Entrained condensate

Steam dispersion port

Humidiﬁer separator drain 3/4" (DN20) pipe thread

8" (203 mm) min.

10"

(254 mm)

min.

DC-1179 mc_050511_0925

Table 49-1: Area-type dispersion fan specifications

120 V

Electric fan motor

Blade diameter 12" (305 mm)

Speeds 3

Control Rotary switch

mc_050511_0924

50/60 Hz

0.75 A

NOTES:

1. Dashed lines indicate provided by installer.

2. Dri-calc is DriSteem’s free sizing and selection software; see Dri-calc on the www.dristeem.com Tools page.

3. Steam valve and strainer sizes are provided by Dricalc (Note 2).

4. See “Piping notes” on Page 23, and see Pages 14 and 15 for more information about trap types and trap piping.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 52

AREA-TYPE HUMIDIFIER

Rise, spread, and throw dimensions

The table below lists the Area-type humidiﬁer's minimum rise, spread and throw non-wetting dimensions. Surfaces cooler

FIGURE 50-1: AREA-TYPE RISE, SPREAD, AND THROW

than ambient temperature, or objects located within this minimum dimension, may cause condensation and dripping.

Rise: Minimum non-wetting height above the steam chute

Spread

Rise

Spread: Minimum non-wetting width from the steam chute Throw: Minimum non-wetting horizontal distance from the steam chute

Throw

The greater the space relative humidity, the higher and farther the discharged steam will carry and rise in the space

mc_041411_1855

DC-5M

until becoming absorbed.

mc_050511_0945

Table 50-1: Area-type humidifier minimum distances for rise, spread, and throw*

Maximum

steam capacity

Rise Spread Throw Rise Spread Throw Rise Spread Throw

lbs/hr kg/h ft m ft m ft m ft m ft m ft m ft m ft m ft m

50 20 1.0 0.3 2.0 0.6 6.0 1.8 1.0 0.3 2.0 0.6 6.0 1.8 1.0 0.3 2.5 0.8 6.0 1.8

75 34 3.0 0.9 3.0 0.9 8.0 2.4 3.0 0.9 3.0 0.9 8.0 2.4 3.0 0.9 4.0 1.2 8.0 2.4

100 45 4.0 1.2 4.0 1.2 10.0 3.1 4.0 1.2 4.0 1.2 10.0 3.1 4.0 1.2 5.0 1.5 10.0 3.1

150 68 6.0 1.8 5.0 1.5 12.0 3.7 6.0 1.8 5.0 1.5 12.0 3.7 6.0 1.8 5.0 1.5 12.0 3.7

200 90 7.0 2.1 7.0 2.1 13.0 4.0 8.0 2.4 7.0 2.1 14.0 4.3 8.0 2.4 7.0 2.1 14.0 4.3

225 102 7.0 2.1 7.0 2.1 13.0 4.0 8.0 2.4 7.0 2.1 14.0 4.3 8.0 2.4 7.0 2.1 14.0 4.3

250 110 8.0 2.4 8.0 2.4 15.0 4.6 9.0 2.7 9.0 2.7 16.0 4.9 9.0 2.7 9.0 2.7 16.0 4.9

285 130 9.0 2.7 9.0 2.7 17.0 5.2 10.0 3.1 10.0 3.1 18.0 5.5 10.0 3.1 10.0 3.1 18.0 5.5

Maximum

steam capacity

Rise Spread Throw Rise Spread Throw Rise Spread Throw

lbs/hr kg/h ft m ft m ft m ft m ft m ft m ft m ft m ft m

50 20 1.0 0.3 1.5 0.5 4.0 1.2 1.0 0.3 2.0 0.6 4.0 1.2 1.0 0.3 2.0 0.6 4.0 1.2

75 34 2.0 0.6 2.0 0.6 6.0 1.8 2.0 0.6 2.5 0.8 6.0 1.8 2.0 0.6 2.5 0.8 6.0 1.8

100 45 3.0 0.9 3.0 0.9 8.0 2.4 3.0 0.9 3.0 0.9 8.0 2.4 3.0 0.9 3.0 0.9 8.0 2.4

30% RH 40% RH 50% RH

60 °F (16 °C)

70 °F (21 °C)

150 68 4.0 1.2 4.0 1.2 10.0 3.1 4.0 1.2 4.0 1.2 11.0 3.4 4.0 1.2 4.0 1.2 11.0 3.4

200 90 5.0 1.5 5.0 1.5 11.0 3.4 5.0 1.5 5.0 1.5 12.0 3.7 5.0 1.5 5.0 1.5 12.0 3.7

225 102 5.0 1.5 5.0 1.5 11.0 3.4 5.0 1.5 5.0 1.5 12.0 3.7 5.0 1.5 5.0 1.5 12.0 3.7

250 110 6.0 1.8 6.0 1.8 12.0 3.7 6.0 1.8 6.0 1.8 13.0 4.0 6.0 1.8 6.0 1.8 14.0 4.3

285 130 7.0 2.1 7.0 2.1 14.0 4.3 7.0 2.1 7.0 2.1 15.0 4.6 7.0 2.1 7.0 2.1 16.0 4.9

* With fan on high speed

mc_030210_0940

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 53

Humidiﬁer start-up and shut-down

HUMIDIFIER START-UP

1. Open steam jacketing shut-off valve, if applicable.

2. Inspect steam valve for proper operation. Pneumatic: Inspect to ensure that: (1) the valve closes off steam tight, (2) the stem packing is not leaking steam, and (3) the diaphragm in the actuator is not leaking air. Electric: Inspect to be sure the valve operates freely, closes off steam tightly, and that the stem packing is not leaking.

3. Inspect steam traps and verify all are working properly. A blocked steam trap will be cold. A “blowing” steam trap will be hot and noisy, and the discharge pipe will be hot for a continuous distance up to 30' (9 m). A properly operating steam trap will have about a twodegree temperature drop measured across the trap from inlet to discharge.

OPERATION

4. Verify airflow proving switch and high limit humidistat, if applicable, are working properly.

HUMIDIFIER SHUT-DOWN

Close humidiﬁer steam supply shut-off valve.

See “Maintenance procedures” on Page 54.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 54

OPERATION

Eliminating excess heat from steam jacketed humidiﬁers

FIGURE 52-1: SINGLE HUMIDIFYING STEAM PATH

Humidiﬁer isolation valve (by others)

Modulating control valve

OM-21

mc_051011_1630

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 55

Eliminating excess heat from steam jacketed humidiﬁers

See Figure 52-1.

In some applications with steam-jacketed humidiﬁers, the heat given off by the steam-heated tube (not the steams sensible heat) may be undesirable. While relatively insigniﬁcant in a single-tube unit (usually a rise of less than 2 °F [1 °C]), it can be much greater in a closely-spaced, multiple-tube installation. This can be dealt with in several ways:

1. Manually turn off the steam supply valve after the humidification season.

2. Insulate the tube exterior. Note: Insulation will enlarge the tube proﬁle, causing

additional resistance to airﬂow.

3. Provide an automatic shut-off valve for the jacketing steam circuit in addition to the modulating control valve. This will eliminate heat gain during the “off” humidification periods only. The jacketing steam valve should be a two-position type, with a minimum Cv of 5, and set to the full-open position prior to opening the modulating valve.

OPERATION

As shown in Figure 52-1, all steam (for jacketing and humidiﬁcation) must pass through the jacket steam valve. It must do so with little or no pressure drop across the valve, or maximum capacity will be reduced. More importantly, with just one supply source for jacket and humidiﬁcation steam, the jacket steam temperature may drop below the temperature required to eliminate dripping. Therefore, the valve must be amply sized. This is not signiﬁcant in a small-capacity humidiﬁer. In a large-capacity humidiﬁer, the required valve size may be quite expensive.

mc_051011_1631

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 56

MAINTENANCE

Maintenance procedures

1. Strainer: Inspect the screen at least twice during the first year. If fouled, it should be inspected more frequently and cleaned as needed.

2. Steam trap: At least twice a year, verify that the steam trap is functioning properly. A blocked steam trap will be cold. An improperly operating steam trap with steam exiting the trap will be hot and noisy, and the discharge pipe from it will be hot for a continuous distance up to 30' (9 m). A properly operating steam trap will have about a 2 °F (1 °C) temperature drop measured across the trap from inlet to discharge.

3. Valve (pneumatic): Inspect annually to ensure that: a. The valve tightly closes off steam. b. The stem packing is not leaking steam. c. The diaphragm in the actuator is not leaking air.

Valve (electric modulating): Inspect annually to ensure that: a. The valve operates freely. b. The valve tightly closes off steam. c. The stem packing is not leaking steam.

Valve (solenoid): Inspect annually to verify proper function with steam-tight shutoff.

4. Silencer: Inspect at least annually for cleanliness. Clean or replace as needed.

5. Teflon seal rings: After one year of service, verify that rings are properly functioning. They require replacement if disturbed, since the Teflon can take a “set” and not return to its uncompressed shape.

6. O-rings (dispersion tube adapters): Replace after two or three years of service.

7. Separator: No maintenance required.

8. Dispersion tube: No maintenance required.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 57

Troubleshooting

Table 55-1: Steam Injection troubleshooting guide

Problem Possible cause Action

Humidiﬁer discharges water in duct • Steam main overloaded with water

due to boiler discharging water with steam (priming) or improper steam main dripping

• Steam trap not draining properly • Replace trap, repair, or clean as required

• Steam pressure is too low (below 2 psi [14 kPa])

• Condensate is collecting in low, undripped points in steam main

• Steam jacketing of tube not up to proper temperature

• Overloaded condensate return main • Replace with larger piping, or pipe condensate to ﬂoor

• Inadequate steam trap capacity • Replace steam trap oriﬁces as necessary.

Humidiﬁer leaks water • Defective O-rings on tube adapter • Replace O-rings

• Locate cause of priming and correct

• Reduce back pressure of condensate return line

• Verify that steam shutoff valves are fully open

• Adjust pressure reducing valve

• Adjust boiler pressure

• Install drips and steam traps as required

• Excessive lifting of condensate. Reroute piping or raise steam pressure.

• Short circuiting inside tube jacketing. Replace tube.

• Improper steam trap location. Relocate and/or add additional trap.

• Condensate return line pressure is too high. Re-pipe.

• Dispersion tube is not level. Reposition.

drain.

• Replace with larger trap.

TROUBLESHOOTING

Humidity exceeds setting of humidistat

Continued

• Steam leak in outer jacket of dispersion tube

• Automatic valve not fully closing • Foreign matter is holding valve open. Clean valve; check

• Control system is malfunctioning • Incorrect control voltage. Verify and correct.

• Leak in steam piping inside duct • Repair leak.

• Repair leak, or replace tube. Note: Check installation to ensure tubes are not rigidly anchored in place. Tubes must be allowed to ﬂex in response to thermal expansion.

line strainer.

• Valve spring is broken. Replace spring.

• Valve stem packing is adjusted too tightly. Loosen and/or replace packing.

• Steam pressure exceeds close-off rating of valve spring. Replace actuator or valve spring with one that is compatible with the higher steam pressure.

• Valve is installed backers. Remount.

• Adjust valve linkage.

• Incorrect control signal. Verify and correct.

• Improper wiring. Verify and correct.

• Incorrect humidity sensor. Verify and correct.

• Humidity controller out of calibration. Calibrate.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 58

TROUBLESHOOTING

Troubleshooting

Table 55-1: Steam Injection troubleshooting guide (continued)

Problem Possible cause Action

Hunting: Humidity swings above and below desired set point

Space humidity will not rise to humidistat set point

Continued

• Control system is malfunctioning. • Faulty or inaccurate humidity controller. Calibrate or replace.

• Automatic valve is hunting. • Humidiﬁer is oversized. Change to a smaller valve.

• Excessive outside air volume • Check fans, dampers, VAV, etc.

• Steam pressure is too low. • Manual steam valve is partially closed. Open.

• Humidiﬁer is undersized. • Replace valve with larger capacity valve.

• Automatic steam valve is not opening fully.

• Control system is malfunctioning. Electric:

• Poor location of control components. Relocate.

• Incompatible control component(s). Change component(s).

• Pressure-reducing valve is not accurately controlling steam pressure. Repair or replace.

• Boiler pressure is swinging too widely. Adjust.

• Strainer screen is partially clogged. Clean.

• Boiler pressure is too low. Adjust.

• Pressure reducing valve is not accurately controlling steam pressure. Repair or replace.

• Boiler pressure is swinging too widely. Adjust.

• Check fans, dampers, VAV, etc.

• Piped incorrectly. Re-pipe.

• Steam piping is undersized.

• Replace with larger humidiﬁer.

• Add additional humidiﬁer.

• Valve packing is adjusted too tightly. Loosen and/or replace packing.

• Adjust valve linkage.

• Check pilot positioner settings.

• Incorrect control circuit voltage. Change transformer.

• Incorrect control signal. Replace component(s) to make all components compatible.

• Improperly wired. Rewire.

• Incorrect humidity sensor (Barber-Colman units only). Replace.

• Humidity controller is out of calibration or is malfunctioning. Repair or replace.

• Malfunctioning humidiﬁer temperature switch is not allowing humidiﬁer valve to open. Replace or readjust.

Pneumatic:

• Humidity controller is out of calibration or is malfunctioning. Repair or replace.

• Obstructed air line. Clean.

• Malfunctioning pneumatic temperature switch. Replace.

• Air leak in actuator. Repair or replace.

• Compressed air pressure is too low. Adjust.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 59

Troubleshooting

Table 55-1: Steam Injection troubleshooting guide (continued)

Problem Possible cause Action

Space humidity will not rise to humidistat set point (continued)

• Foreign matter is preventing valve from opening.

• Excessive outside air volume. • Reduce air volume.

TROUBLESHOOTING

• Clean or replace valve.

Condensate in duct • Humidiﬁer is mounted too close to

internal devices (dampers, turning vanes, etc.) in duct.

• A noninsulated duct is passing through an unheated area (duct surface temperature is too low).

• Air cannot absorb steam quantity being discharged.

• Steam pressure is too high, causing excess capacity.

Humidiﬁer is noisy • Tube silencer is missing. • Install silencer.

• Check fan, dampers, VAV, etc.

• Move humidiﬁer tubes to a point farther upstream from internal devices.

• Add dispersion tubes for shorter absorption distance. consult DriSteem to determine the total number of tubes required.

• Insulate ductwork.

• Humidiﬁer is operating when blower is off. Install airﬂow proving switch.

• Valve is hunting. See previous page for instructions.

• Air temperature in duct is too low for steam quantity being supplied.

• Air cfm in duct is too low for steam quantity being supplied.

• Reduce steam pressure.

Note: Unless special-ordered, silencers are furnished only with

Model 60 and Model 70 tubes equal to or shorter than 48” (1219 mm), and only with black iron piping.

• Dispersion tube output is excessively high.

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

• Install additional tubes.

Page 60

REPLACEMENT PARTS

Single-tube and Multiple-tube humidiﬁers

FIGURE 58-1: SINGLE-TUBE AND MULTIPLE-TUBE HUMIDIFIER REPLACEMENT PARTS

OM-23

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 61

Single-tube and Multiple-tube humidiﬁers

Table 59-1: Single-tube and Multiple-tube humidifier replacement parts

No. Description Part No.

1 Separator (vertical separator shown) Consult factory

Valve/actuator assembly (refer to speciﬁc order)

Valve/actuator assembly or actuator alone are available as replacement parts. Valve body alone is not available as a replacement part.

3 Actuator Consult factory

4 Tube adapter Consult factory

O-ring, 1" I.D., black EPDM, for Model 60 and Model 70 tubes (not shown)

O-ring, 1½” I.D., black EPDM, for Model 80 tubes (not shown)

6 Silencer holder, stainless steel (not shown) 183100

7 Medium grit stainless steel wool (not shown) 300210

8 Replacement tube Consult factory

Seal ring, brass, 1/2" (DN15), for Model 60 tube 306360-001

Seal ring, brass, 3/4" (DN20), for Model 70 tube 306360-002

Seal ring, brass, 1½" (DN40), for Model 80 tube 306360-003

Seal ring, 316 stainless steel, 1/2" (DN15), for Model 60 tube 306360-007

Seal ring, 316 stainless steel, 3/4" (DN20), for Model 70 tube 306360-004

Seal ring, 316 stainless steel, 1½" (DN40), for Model 80 tube 306360-006

10 Nipple Consult factory

11 Elbow Consult factory

12 Union Consult factory

13 Tubelet Consult factory

14 Y-strainer Consult factory

Steam trap, ﬂoat and thermostatic (F&T) (shown), cast iron, 3/4" (DN20), for ≤15 psi (103.4 kPa)

Steam trap, inverted bucket, cast iron, 3/4" (DN20), for >15 psi (103.4 kPa) or lifting condensate

Steam trap, thermostatic, 316 stainless steel, 3/4" (DN20) 300025

Temperature switch, electric 400260-001

Temperature switch, pneumatic 307076

Consult factory

300400-007

300400-006

300000-DB

300010

REPLACEMENT PARTS

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 62

REPLACEMENT PARTS

Area-type humidiﬁer

Table 60-1: Area-type humidifier with electric fan replacement parts

No. Description Part No.

1 Separator (with 3/4" NPT [DN20] supply) Consult factory

2 Fan, three-speed 400010

3 Valve actuator Consult factory

Valve, 1/2" NPT (DN15) pneumatic with operator

Valve, 3/4" NPT (DN20) pneumatic with operator

Valve, 1" NPT (DN25) pneumatic with

operator

Valve, 1/2" NPT (DN15) electric 510030

Valve, 3/4" NPT (DN20) electric 510031

Valve, 1" NPT (DN25) electric 510032

510060

510061

510063

FIGURE 60-1: AREA-TYPE HUMIDIFIER WITH ELECTRIC FAN

DC-6M

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 63

Mini-bank humidiﬁer

REPLACEMENT PARTS

Table 61-1: Mini-bank humidifier replacement parts

No. Description Part No.

1 5" (127 mm) separator 162520

Valve, 1/2" (DN15)) pneumatic with operator 510060

Valve, 1/2" (DN15) electric 510030

3 Oriﬁce, brass (not shown)* 203450

4 Trap, ﬂoat and thermostatic (F&T) (not shown)** 300000

5 Y-strainer, 1/2" (DN15) (not shown)** 300100-001

6 Valve actuator Consult factory

NOTES: * Varies with each order ** Shipped loose

FIGURE 61-1: MINI-BANK HUMIDIFIER REPLACEMENT PARTS

OM-7479

STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

Page 64

WARRANTY

Expect quality from the industry leader

For more than 45 years, DriSteem has been leading the industry with creative and reliable humidiﬁcation solutions. Our focus on quality is evident in the construction of our Steam Injection humidiﬁers, which feature cleanable stainless steel construction. DriSteem also leads the industry with a Two-year Limited Warranty and optional extended warranty.

For more information

www.dristeem.com sales@dristeem.com

For the most recent product information visit our Web site: www.dristeem.com

DRI-STEEM Corporation a subsidiary of Research Products Corporation DriSteem U.S. operations are ISO 9001:2015 certiﬁed

U.S. Headquarters: 14949 Technology Drive Eden Prairie, MN 55344 800-328-4447 or 952-949-2415 952-229-3200 (fax)

Two-year Limited Warranty

DRI-STEEM Corporation (“DriSteem”) warrants to the original user that its products will be free from defects in materials and workmanship for a period of two (2) years after installation or twentyseven (27) months from the date DriSteem ships such product, whichever date is the earlier.

If any DriSteem product is found to be defective in material or workmanship during the applicable warranty period, DriSteem’s entire liability, and the purchaser’s sole and exclusive remedy, shall be the repair or replacement of the defective product, or the refund of the purchase price, at DriSteem’s election. DriSteem shall not be liable for any costs or expenses, whether direct or indirect, associated with the installation, removal or reinstallation of any defective product. The Limited Warranty does not include cylinder replacement for electrode steam humidiﬁers.

DriSteem’s Limited Warranty shall not be effective or actionable unless there is compliance with all installation and operating instructions furnished by DriSteem, or if the products have been modiﬁed or altered without the written consent of DriSteem, or if such products have been subject to accident, misuse, mishandling, tampering, negligence or improper maintenance. Any warranty claim must be submitted to DriSteem in writing within the stated warranty period. Defective parts may be required to be returned to DriSteem.

DriSteem’s Limited Warranty is made in lieu of, and DriSteem disclaims all other warranties, whether express or implied, including but not limited to any IMPLIED WARRANTY OF MERCHANTABILITY, ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, any implied warranty arising out of a course of dealing or of performance, custom or usage of trade.

DriSteem SHALL NOT, UNDER ANY CIRCUMSTANCES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS, REVENUE OR BUSINESS) OR DAMAGE OR INJURY TO PERSONS OR PROPERTY IN ANY WAY RELATED TO THE MANUFACTURE OR THE USE OF ITS PRODUCTS. The exclusion applies regardless of whether such damages are sought based on breach of warranty, breach of contract, negligence, strict liability in tort, or any other legal theory, even if DriSteem has notice of the possibility of such damages.

By purchasing DriSteem’s products, the purchaser agrees to the terms and conditions of this Limited Warranty.

European ofﬁce: Marc Briers Grote Hellekensstraat 54 b B-3520 Zonhoven Belgium +3211823595 (voice) +3211817948 (fax) E-mail: marc.briers@dristeem.com

Continuous product improvement is a policy of DriSteem Corporation; therefore, product features and speciﬁcations are subject to change without notice.

DriSteem, DriCalc and Mini-bank are registered trademarks of Research Products Corporation and are ﬁled for trademark registration in Canada and the European community.

Area-type and Maxi-bank and trademarks of Research Products Corporation.

Product and corporate names used in this document may be trademarks or registered trademarks. They are used for explanation only without intent to infringe.

Extended warranty

The original user may extend the term of the DriSteem Limited Warranty for a limited number of months past the initial applicable warranty period and term provided in the ﬁrst paragraph of this Limited Warranty. All the terms and conditions of the Limited Warranty during the initial applicable warranty period and term shall apply during any extended term. An extended warranty term of an additional twelve (12) months or twenty four (24) months of coverage may be purchased. The extended warranty term may be purchased until eighteen (18) months after the product is shipped, after which time no extended warranties are available.

Any extension of the Limited Warranty under this program must be in writing, signed by DriSteem, and paid for in full by the purchaser.

mc_051308_0630

Form No. DS-IOM-0115 Part No. 890000-401 Rev F