DriSteem SINGLE-TUBE Series Installation, Operation And Maintenance Manual
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DriSteem SINGLE-TUBE Series Installation, Operation And Maintenance Manual

Steam injection humidifiers for use with steam boilers
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READ AND SAVE THESE INSTRUCTIONS
STEAM INJECTION
Hu mi di fier s
Installation, Operation,
and Maintenance Manual
For use with steam boilers

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Summary of Contents for DriSteem SINGLE-TUBE Series

  • Page 1 READ AND SAVE THESE INSTRUCTIONS STEAM INJECTION Hu mi di fier s Installation, Operation, and Maintenance Manual For use with steam boilers...

  • Page 2: Safety Precautions

    HVAC and electrical contractors and in compliance with local, In Dri-calc ® state, federal, and governing codes. Improper installation can Dri-calc is DriSteem’s free sizing and cause property damage, severe personal injury, or death as a selection software for calculating load, result of electric shock, burns, or fire.

  • Page 3: Table Of Contents

    Field piping ......... . . 24 DriSteem technical support MULTIPLE-TUBE HUMIDIFIER .

  • Page 4: Overview

    ® 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.

  • Page 5: Available Models

    OVERVIEW Available models FIGURE 3-1: STEAM INJECTION HUMIDIFIER MODELS All Steam Injection humidifiers shown here, except Area-type, are available with options for applications requiring stainless steel steam SINGLE-TUBE HUMIDIFIER components. • Suitable for small- to medium-capacity systems, 1.5 – 525 lbs/hr (0.7 – 238 kg/h) •...

  • Page 6: Basic Components

    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.

  • Page 7: Principle Of Operation

    OVERVIEW Principle of operation FIGURE 5-1: STEAM INJECTION HUMIDIFIER PRINCIPLE OF OPERATION 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: •...

  • Page 8: Humidifier Placement

    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.
  • Page 9 OVERVIEW 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.
  • Page 10 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.

  • Page 11: Sensor Placement

    Figure 9-1. factors that play an important role in overall system control are: Note: DriSteem recommends that you do not interchange room and duct humidity devices. Room humidity devices are calibrated with zero or • Size of humidification system relative to...

  • Page 12: Pressurized Steam Piping Guidelines

    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).
  • Page 13 OVERVIEW Pressurized steam piping guidelines FIGURE 11-1: FIELD PIPING OVERVIEW Take off branch lines from the top of the Pitch main 1/4" per 10' (0.2%) steam main, preferably at a 45° angle, 45° although vertical 90° connections are acceptable Pitch humidifier branch 1/2" per 10' (0.4%) if distance from main to Piping same size as humidifier is less than 10' (3.3 m)
  • Page 14 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) DC-1064 maximum Condensate return flow Inverted bucket steam trap Check valve (swing type) In certain installations, it is not possible to drain the humidifier steam trap by gravity.
  • Page 15 12" 1. Dashed lines indicate provided by installer. (305 mm) 2. Steam valve and strainer sizes are provided by DriCalc, DriSteem's free sizing and selection software, available at www.dristeem.com. 4" (100 mm) mc_042811_1450 STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL...

  • Page 16: Condensate Drain Piping And Trapping

    OVERVIEW Condensate drain piping and trapping FIGURE 14-1: CONDENSATE DRAIN PIPING AND TRAPS FOR STEAM INJECTION HUMIDIFIERS P-trap dimensions Mechanical trap dimensions Typical model Stainless steel components model Condensate outlet Condensate outlet Condensate outlet Drop Drop Seal Stainless steel Drip Drip thermostatic trap...
  • Page 17 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.

  • Page 18: Temperature Switches

    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" humidistat (0.18 mm) restrictor (optional) DC-1190 mc_051011_1650 Separator 12" (305 mm) min. Pneumatic temperature switch Steam trap...
  • Page 19 OVERVIEW 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.
  • Page 20 OVERVIEW Temperature switches FIGURE 18-1: ELECTRIC MODULATING TEMPERATURE SWITCH LOCATION Class 2 transformer (by Electric modulating humidistat installer) used with 24 VAC coil (optional) or control signal by others Omit transformer when using 120 VAC coil 120 VAC Normally closed electric modulating primary valve (120 VAC or 24 VAC) 24 VAC...
  • Page 21 DriSteem's electric temperature switch is a temperature- actuated 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).

  • Page 22: Single-Tube Humidifier

    SINGLE-TUBE HUMIDIFIER Configurations FIGURE 20-2: CHANGING FROM RIGHT- FIGURE 20-1: SINGLE-TUBE HUMIDIFIER INSTALLATION HAND TO LEFT-HAND CONFIGURATION CONFIGURATIONS Horizontal tube/horizontal airflow Opposite connection Steam inlet Typical configuration. Single-tube humidifiers are shipped this way unless ordered otherwise. See Page 24 for more information about this configuration.

  • Page 23: Assembly

    SINGLE-TUBE HUMIDIFIER Assembly FIGURE 21-1: SINGLE-TUBE HUMIDIFIER FIELD ASSEMBLY Single-tube humidifier Detail: Tube adapter single dispersion tube Actuator Strainer Tube adapter Tube adapter Valve Support Half coupling separator Dispersion tube bracket assembly O-rings Dispersion tube Automatic valve Teflon ® O-rings Steam seal ring Hooks of...

  • Page 24: Installation

    “Humidifier placement” on Pages 6 – 8 for location Excessive moisture hazard recommendations. DriSteem strongly recommends installing 7. Install a temperature switch to prevent possible cold-start a duct airflow proving switch and a duct dripping when steam pressure to the humidifier is cycled.

  • Page 25: Piping Notes

    SINGLE-TUBE HUMIDIFIER 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.

  • Page 26: Field Piping

    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.
  • Page 27 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).
  • Page 28 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).
  • Page 29 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).

  • Page 30: Multiple-Tube Humidifier

    MULTIPLE-TUBE HUMIDIFIER Field assembly Note: For Maxi-bank option, follow the “Maxi-bank option field assembly and FIGURE 28-1: TUBE ADAPTER FOR MULTIPLE-TUBE HUMIDIFIERS installation” instructions on Page 36. Header tee O-rings 1. Unpack shipment and verify receipt of all components with packing list. (by installer) Dispersion tube Report any shortages at once.

  • Page 31: Installation

    Mount this humidistat far enough downstream to Excessive moisture hazard ensure that injected steam has been completely absorbed before DriSteem strongly recommends installing the humidistat. See “Humidifier placement” on Pages 6 – 8 a duct airflow proving switch and a duct for location recommendations.

  • Page 32: Piping Notes

    MULTIPLE-TUBE HUMIDIFIER Piping notes NOTE: For Maxi-bank option, see the “Maxi-bank option piping notes” on Page For total dispersion tube lengths of more than 45’ (13.7 m), see Step 10 note on Page 28. 1. Refer to piping drawings on Pages 31 through 35. 2.

  • Page 33: Field Piping

    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).
  • Page 34 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).
  • Page 35 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).
  • Page 36 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).
  • Page 37 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).

  • Page 38: Maxi-Bank Humidifier

    Maxi-bank option field assembly and installation The Maxi-bank humidifier’s header piping and steam-jacket For more installation information piping are provided by DriSteem. The Maxi-bank is factory • See “Humidifier placement” on Pages 6 – 8 for information about choosing assembled and shipped intact, except for larger units that an installation location.
  • Page 39 MAXI-BANK HUMIDIFIER 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.
  • 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.

  • Page 41: Maxi-Bank Option Piping Notes

    MAXI-BANK HUMIDIFIER Maxi-bank option piping notes 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.

  • Page 42: Maxi-Bank Option Field Piping

    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).
  • Page 43 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).
  • Page 44 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).
  • Page 45 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).
  • Page 46 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).

  • Page 47: Assembly And Installation

    5. Install the Mini-bank humidifier in the duct, positioning Excessive moisture hazard the assembly so the tube bank is perpendicular to the top DriSteem strongly recommends installing and bottom of the duct and level across the duct. Support a duct airflow proving switch and a the dispersion tube bank out-board end with a No.
  • 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.

  • Page 49: Field Piping

    MINI-BANK HUMIDIFIER Field piping FIGURE 47-1: MINI-BANK HUMIDIFIER IN A DUCT HORIZONTAL AIRFLOW Isolation valve (by others) 1/2” Pipe thread (DN15) steam jacket inlet From steam source Face width 10-32 (M5) tapped hole to attach (38 mm) 1.5" Union dispersion end to Install strainer within 3' (1 m) Valve duct...

  • Page 50: Area-Type Humidifier

    AREA-TYPE HUMIDIFIER Installation ASSEMBLY AND INSTALLATION WARNING 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 Improper mounting hazard Mount humidifier per the instructions in this return, and electrical supplies to operate the fan.

  • Page 51: Field Piping

    DC-1179 mc_050511_0925 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 Dri- calc (Note 2).

  • Page 52: Rise, Spread, And Throw Dimensions

    AREA-TYPE HUMIDIFIER Rise, spread, and throw dimensions The table below lists the Area-type humidifier's minimum rise, FIGURE 50-1: AREA-TYPE RISE, SPREAD, AND THROW spread and throw non-wetting dimensions. Surfaces cooler than ambient temperature, or objects located within this Spread minimum dimension, may cause condensation and dripping. Rise Rise: Minimum non-wetting height above the steam chute...

  • Page 53: Humidifier Start-Up And Shut-Down

    OPERATION 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.

  • Page 54: Eliminating Excess Heat From Steam Jacketed Humidifiers

    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 OPERATION 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.

  • Page 56: Maintenance

    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.

  • Page 57: Troubleshooting

    TROUBLESHOOTING Troubleshooting Table 55-1: Steam Injection troubleshooting guide Problem Possible cause Action Humidifier discharges water in duct • Steam main overloaded with water • Locate cause of priming and correct due to boiler discharging water with steam (priming) or improper steam main dripping •...
  • Page 58 TROUBLESHOOTING Troubleshooting Table 55-1: Steam Injection troubleshooting guide (continued) Problem Possible cause Action Hunting: Humidity swings above and • Control system is malfunctioning. • Faulty or inaccurate humidity controller. Calibrate or replace. below desired set point • Poor location of control components. Relocate. •...
  • Page 59 • Move humidifier tubes to a point farther upstream from vanes, etc.) in duct. internal devices. • Add dispersion tubes for shorter absorption distance. consult DriSteem to determine the total number of tubes required. • A noninsulated duct is passing • Insulate ductwork. through an unheated area (duct surface temperature is too low).

  • Page 60: Replacement Parts

    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 REPLACEMENT PARTS Single-tube and Multiple-tube humidifiers Table 59-1: Single-tube and Multiple-tube humidifier replacement parts No . Description Part No . Separator (vertical separator shown) Consult factory Valve/actuator assembly (refer to specific order) Valve/actuator assembly or actuator alone are available as replacement Consult factory parts.

  • Page 62: Area-Type Humidifier

    REPLACEMENT PARTS Area-type humidifier FIGURE 60-1: AREA-TYPE HUMIDIFIER Table 60-1: WITH ELECTRIC FAN Area-type humidifier with electric fan replacement parts No . Description Part No . Separator (with 3/4" NPT [DN20] supply) Consult factory Fan, three-speed 400010 Valve actuator Consult factory Valve, 1/2"...

  • Page 63: Mini-Bank Humidifier

    REPLACEMENT PARTS Mini-bank humidifier FIGURE 61-1: MINI-BANK HUMIDIFIER Table 61-1: REPLACEMENT PARTS Mini-bank humidifier replacement parts No . Description Part No . 5" (127 mm) separator 162520 Valve, 1/2" (DN15)) pneumatic with operator 510060 OM-7479 Valve, 1/2" (DN15) electric 510030 Orifice, brass (not shown)* 203450 Trap, float and thermostatic (F&T) (not shown)**...

  • Page 64: Warranty

    DriSteem has U.S. Headquarters: notice of the possibility of such damages.

This manual is also suitable for:

Mini-bank seriesMultiple-tube seriesArea-type series

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