Neptronic Multi-Steam™ SD/HD

Foreword and Safety Instructions

Neptronic Company Overview

Founded in 1976, Neptronic is a private corporation that designs, manufactures, and distributes products for the HVAC industry. Their product line includes intelligent controllers, electronic actuators, actuated valves, humidifiers, and electric heaters.

Neptronic products are designed and manufactured by over 250 dedicated employees in their 7,500 m² (80,000 ft²) state-of-the-art facility located in Montreal, Canada. They utilize a vertical integration model, managing the entire manufacturing chain from software and hardware development to SMT circuit board assembly, sheet metal fabrication, and product testing, ensuring products are engineered for longevity.

The company holds several national and international patents and is committed to research and development, providing innovative products and technologies for the HVAC industry. Exporting over 70% of their sales, Neptronic has an exclusive global distribution network.

About the Manual

These installation and operation instructions are developed to facilitate the installation of the Multi-Steam™ SD/HD. Strict adherence to these instructions ensures conformity with manufacturer recommendations and is a condition for warranty application. However, these instructions do not guarantee conformity with all local procedures, regulations, or codes regarding electric installation and water supply connections.

This product has been declared to conform to applicable Canadian and American safety standards and directives, bearing the CSA (c) & (us) mark. A Certificate of Conformity CSA is available upon request.

© 2025: All rights reserved. This document cannot be reproduced without prior written authorization from Neptronic.

Electricity

⚠️ All work concerned with electrical installation MUST only be performed by skilled and qualified technical personnel, such as an electrician or a trained technician. The customer is responsible for ensuring the suitability of the personnel. Please observe local regulations for electrical installations.

Correct Use

Neptronic systems are designed exclusively for humidification use. Any other application is considered inappropriate. The manufacturer is not liable for any damage resulting from incorrect use.

General Warranty

This product is subject to the terms and conditions described at http://www.neptronic.com/Sales-Conditions.aspx.

List of Illustrations

• Illustration 1 - X-Stream and Standard Steam Distributor: Page 4
• Illustration 2 - Components Overview: Page 6
• Illustration 3 - Installation Stages Overview: Page 8
• Illustration 4 - Steam Distribution System Installation: Page 9
• Illustration 5 - Manifold Installation: Front View: Page 10
• Illustration 6 - Manifold Installation: Side View: Page 10
• Illustration 7 - Header Mounting Brackets and Steam: Page 10
• Illustration 8 - Steam Control Valve Installation: Page 11
• Illustration 9 - Flow Direction, Steam Control Valve: Page 11
• Illustration 10 - Tilt Angle, Steam Control Valve: Page 11
• Illustration 11 - Steam Separator Installation: Page 13
• Illustration 12 - Correct Installation: Page 13
• Illustration 13 - Incorrect Installation: Page 13
• Illustration 14 - Temperature Sensor Installation: Page 14
• Illustration 15 - Float and Thermostatic Steam Trap Installation: Page 14
• Illustration 16 - Correct distance between Temperature Sensor and Steam Trap: Page 15
• Illustration 17 - Strainer Installation: Page 15

Contents

1. Technical Specifications: Page 4
2. Product Description: Page 4
3. Handling and Packing:
   • Handling and Lifting: Page 7
   • Unpacking: Page 7
4. Installation Overview:
   • Installation Method Statement: Page 8
5. Stage 1 - Steam Dispersion Grid and Header Installation: Page 9
6. Stage 2 - Steam Control Valve (AM060) Installation: Page 11
7. Stage 3 - Steam Separator Installation: Page 13
8. Stage 4 - Temperature Sensor Installation: Page 14
9. Stage 5 - Float and Thermostat Steam Trap Installation: Page 14
10. Stage 6 - Strainer Installation: Page 15
11. Stage 7 - Electronic Steam Controller (SKDESC-M): Page 16
12. Initial Verification:
    • Installation: Page 28
    • Electrical: Page 28
    • Drain if Required: Page 28
    • Steam Supply: Page 28
    • Controls: Page 28
13. Start-Up Procedure:
    • Start-up: Page 29
    • Safety Test: Page 29
    • Reset the Setpoint and Control Mode: Page 29
    • End: Page 29
14. Notes: Page 30

Technical Specifications

Product Description

The Direct Steam Injection Humidifier injects and disperses atmospheric or low pressure steam into a building's air supply system to attain and maintain the desired humidity level. It uses steam from an in-house boiler to humidify the air. The Direct Steam Injection Humidifier is available in two configurations:

• Multi-Steam™ SD (Standard)
• Multi-Steam™ HD (with X-Stream™ Technology)

The Multi-Steam™ HD is combined with X-Stream™, a high efficiency insulated steam distributor that increases the performance of the humidifier and provides an ideal solution for atmospheric and low pressure steam applications. The Multi-Steam™ SD (Standard) is the standard variation that offers all the unique features of the Direct Steam Injection Humidifier except the X-Stream™ technology. The following illustration indicates the difference between the X-Stream™ and standard steam distributor.

Features of the Multi-Steam™ SD/HD

The Multi-Steam™ SD/HD is controlled by an Electronic Steam Controller (SKDESC-M) designed for user-friendly operation with features like easy start-up, diagnostics, a large LCD display, simple configuration, and factory settings. It optimizes energy efficiency and prevents condensate ejection.

• Multi-Steam Distribution System: Stainless steel dispersion grids (1 3/8" [35mm]) mounted on a horizontal header. The ESC controller modulates steam flow to the grids, which then releases steam through multiple eyelets, mixing it with airflow to achieve the desired humidity. It is described as the most energy-efficient system providing drain-free operations.
• X-Stream™ Technology: Available on the Multi-Steam™ HD, this high-efficiency insulated steam distributor enhances humidifier performance, reducing energy wastage by up to 85%, airstream heat gain, and generated condensate.
• Steam Separator: Constructed with stainless steel, it supplies condensate-free steam to the control valve and directs condensate to the steam trap.
• Control Valves: Normally closed globe valves with equal percentage flow characteristics. Variants include bronze body and brass trim (optional stainless steel trim). The linear electric actuator (AM060) has a heat shield and provides full modulation of low-pressure steam for precise humidity control.
• Electronic Steam Controller (SKDESC-M): A microprocessor-based controller with a backlit LCD display for programming humidity setpoints and monitoring parameters like actual humidity, airflow switch, interlock, and temperature sensors.
• Strainer: Removes foreign matter from pipelines, protecting humidifier components.
• RTD Temperature Sensors: Integrated in brass thermowells, these sensors monitor steam temperature and detect abnormal condensate levels for safe operation.
• Float and Thermostatic Steam Trap: Features a universal four-port design with stainless steel internal components (optional stainless steel body). It eliminates condensate from the steam line.

Components Overview

Handling and Packing

Handling and Lifting

⚠️ Lifting or handling MUST be carried out by trained and qualified personnel. Ensure the lifting operation is properly planned, risk-assessed, and checked by a competent Health & Safety representative. The customer is responsible for ensuring operators are trained in handling heavy goods and comply with relevant lifting regulations.

The Multi-Steam™ SD/HD MUST always be handled and lifted with care, remaining in its original packaging as long as possible. The package can be moved using a forklift from the underside, exercising caution for a balanced load.

Unpacking

The Multi-Steam™ SD/HD is shipped in carton boxes or a wooden crate. Remove all packing and skids before commissioning.

Installation Overview

⚠️ All installation work must comply with local regulations.

All work related to the installation of the Multi-Steam™ SD/HD MUST only be performed by skilled and qualified technical personnel, such as plumbers or technicians with appropriate training. The customer is responsible for ensuring their suitability. No specific tooling requirements are mentioned for the installation of the Multi-Steam™ SD/HD and its associated components.

Installation Method Statement

The installation process is divided into the following stages:

1. Stage 1 - Steam Dispersion Grid and Header Installation
2. Stage 2 - Steam Control Valve (AM060) Installation
3. Stage 3 - Steam Separator Installation
4. Stage 4 - Temperature Sensor Installation
5. Stage 5 - Float and Thermostat Steam Trap Installation
6. Stage 6 - Strainer Installation
7. Stage 7 - Electronic Steam Controller (SKDESC-M)

Stage 1 - Steam Dispersion Grid and Header Installation

General Considerations

⚠️ Any installation work must be carried out by suitably qualified personnel.

Positioning Steam Dispersion

• Plan a location that is easy to access for inspection and servicing.
• Steam nozzles must face the airflow to minimize absorption and non-wetting distance.
• Do not install the humidifier where its failure could damage the building structure or other expensive equipment.
• Verify that the duct or AHU wall construction can support the steam distributors for their entire lifespan.

Positioning the Header Assembly

• Locate the steam distributors assembly far enough from elbows or fans to ensure laminar airflow for proper evaporation distance.
• There must be sufficient straight duct downstream from the steam distributors for steam absorption.
• Position the assembly so that distances on both sides are equal.

• For insertion type, secure the header on the bottom of the duct with metal screws.
• Secure the top of the assembly by bolting the perforated top mounting plate to the ventilation duct or AHU.
• Use the duct bottom mounting brackets to secure the header underneath the duct.

Stage 2 - Steam Control Valve (AM060) Installation

⚠️ Any installation work must be carried out by suitably qualified personnel.

Positioning the Control Valve

• Install the actuated valve (AM060 actuator with globe valve) between 20 to 30 degrees from vertical to reduce convection heat to the actuator.

Control Valve Flow Coefficient and Capacity

Stage 3 - Steam Separator Installation

⚠️ Any installation work must be carried out by suitably qualified personnel.

Positioning the Steam Separator

Install the steam separator so that the steam inlet is on the top and the steam outlet is on the side. The condensate outlet must point vertically down.

Stage 4 - Temperature Sensor Installation

⚠️ Any installation work must be carried out by suitably qualified personnel.

Installing the Temperature Sensor

• The Multi-Steam™ SD/HD requires only one temperature sensor.
• Install the temperature sensor upstream of the control valve and downstream of the steam separator.

Stage 5 - Float and Thermostat Steam Trap Installation

⚠️ Any installation work must be carried out by suitably qualified personnel.

Installing Float and Thermostatic Steam Trap

• The Multi-Steam™ SD/HD system requires at least one float and thermostatic steam trap, installed downstream of the temperature sensor.
• Connect the float and thermostatic steam trap inlet to the temperature sensor using a single nipple.
• Connect the float and thermostat steam trap outlet to the condensate return line.
• The distance between the temperature sensor and the steam trap must be between 5 and 7" (100-175 mm).

• Connect a float and thermostat steam trap or a P-trap to the header condensate outlet.

Stage 6 - Strainer Installation

⚠️ Any installation work must be carried out by suitably qualified personnel.

Install the strainer within six linear feet from the steam separator, reducing the pipe length for the strainer and the first Multi-Steam™ SD/HD component.

Stage 7 - Electronic Steam Controller (SKDESC-M)

Models

• SKDESC-M
• SKDESC-MB with BACnet Communication
• SKDESC-MD with Modbus Communication

Description

The Electronic Steam Controller SKDESC-M is made specifically for Neptronic SKD-M (Multi-Steam) Humidifiers.

Features

• Conserves energy and eliminates condensate (dry operation)
• Manages isolating and modulating valves
• Pre-heats tube channel jackets only on demand for humidity
• Automatic temperature sensor adjustment
• On/Off or Modulating control
• Selectable internal or external control
• Configurable proportional control band & dead band
• Selectable Fahrenheit or Celsius scale
• BACnet or Modbus models available
• 24 Vac power supply (by others)
• Easy start up and troubleshooting
• Backlit LCD with simple icon and text driven menus

Technical Specifications

Wiring

Neptronic strongly recommends wiring all Neptronic products to a separate grounded transformer that shall service only Neptronic products. This precaution will prevent interference with, and/or possible damage to incompatible equipment.

Terminal Descriptions:

• 5 Interlock: Contact opening = alarm and unit shutdown
• 4 Hi Limit: Contact opening = alarm and unit shutdown
• 3 COM
• 2 PD Switch: Contact opening = alarm and unit shutdown
• 1 Demand: Contact closure = Override and force 100% demand

Programming Mode

Symbols used in this manual

• ~ Humidity
• ?️ Temperature
• ? Communication/Network
• ? Air Flow
• ⏱️ Timer/Clock

Programming Mode Steps

To enter the Programming Mode, perform the following steps:

1. Press ⭐ to start and enter password (see Step 1 "enter passwrd").
2. Use the arrow buttons ▲ or ▼ to navigate the menu.
3. Press ⭐ to enter edit mode of the displayed value.
4. Once in edit mode, use the arrow buttons ▲ or ▼ to change values. Changed values are automatically saved.
5. Press ⭐ to exit edit mode of the displayed value.
6. Return to step 2 or press to exit the mode. Auto exits after 5 minutes without any action.

1. "enter passwrd"

   Value: 637

   Enter the password within 1 minute. After entering the correct password, press ⭐ to proceed. If you enter the wrong password, the controller returns to the normal operation mode and you have to repeat this step.

2. "languag"

   Default: ENG (English)

   Range: ENG (English)

   Select the desired language.

3. "metric display units"

   Default: ON

   Range: ON (metric units - °C, kg H₂O/Hr), OFF (imperial units - °F, lbs H₂O/Hr)

   Select the desired measurement system.

4. "econo mode"

   Default: OFF (econo mode deactivated)

   Range: ON (econo mode activated), OFF (econo mode deactivated)

   In Econo mode, the isolation valve will be closed when there is no demand.

   ℹ️ Important: For correct operation, set the econo mode feature to OFF (econo mode deactivated).

5. "working capacit in pct"

   Default: 100%

   Range: 10 to 100%

   Increment: 5%

   This option enables you to adjust the maximum demand capacity of the full system capacity in %. This percentage is a factory setting. It is recommended not to change this value without consulting Neptronic.

6. "separat temper offset"

   Default: 0

   Range: -10 to 10°C [-18 to 18°F]

   Increment: 0.1°C [0.1°F]

   Set the desired temperature reading.

7. "Control Mode"

   Default: Extern

   Range: Intern, Extern, Net

   Select the desired control mode from the available options:

   • If Intern is selected: the humidifier is controlled by the SKDESC-M.
   • If Extern is selected: the humidifier is controlled by an external signal.
   • If Net is selected: the humidifier is controlled over the network. This option is available only on SKDESC-MB and SKDESC-MD models.

   If you selected Intern or Net, go to Step 9 "network room humidty".

8. "demand signal range"

   Default: 2-10 Vdc

   Range: 0-10 Vdc, 2-10 Vdc

   Select the desired relative humidity sensor signal.

9. "network room humidty”

   Default: OFF

   Range: OFF, ON

   This option is available only on SKDESC-MB and SKDESC-MD models. Select ON if you want to control the humidity over the network.

   If you selected ON, go to Step 12 "Externa Humidty Setpnt".

   If you selected Intern at Step 7 "Control Mode", go to Step 11 "Room humidty signal range".

10. “room humidty offset in pct”

    Default: 0% RH

    Range: -10 to 10% RH

    Increment: 0.1% RH

    Adjust the room relative humidity reading by using the offset.

11. “Room humidty signal range"

    Default: 2-10 Vdc

    Range: 0-10 Vdc, 2-10 Vdc

    Select the desired signal range from the available options. If you selected Extern at Step 7 "Control Mode", go to Step 18 "High limit sensor".

12. "Externa Humidty Setpnt"

    Default: OFF

    Range: OFF, ON

    Select ON if you want to use an external setpoint for humidity. If you selected OFF, go to Step 14 "interna humidty setpnt in pct”.

13. “setpnt signal range"

    Default: 2-10 Vdc

    Range: 0-10 Vdc, 2-10 Vdc

    Select the desired relative humidity sensor signal. Go to Step 15 "control dead band in pct".

14. “interna humidty setpnt in pct"

    Default: 40% RH

    Range: 10% to 90% RH

    Increment: 1% RH

    Set the desired humidity setpoint in % RH.

15. “control dead band in pct”

    Default: 2.0% RH

    Range: 0% to 5% RH

    Increment: 0.1% RH

    Set the desired control dead band.

16. “control Prop ramp in pct"

    Default: 5.0%

    Range: 1% to 10%

    Increment: 0.1%

    Set the desired control proportional ramp.

17. “control integra ramp in pct"

    Default: 5.0%

    Range: 1% to 10%

    Increment: 0.1%

    Set the desired control integral ramp.

18. "High limit sensor”

    Default: Digital (On/Off)

    Range: Disable, Analog, Digital (On/Off), Network

    Select the desired type of high limit sensor from the available options. This option is available only on SKDESC-MB and SKDESC-MD models.

    If you selected Digital, go to Step 23 "High limit max demand in pct".

    If you selected Disable, go to Step 24 "end of season delay in hr".

19. "High limit setpnt in pct”

    Default: 80% RH

    Range: 10% to 90% RH

    Increment: 1% RH

    Set the high limit relative humidity setpoint.

20. "High limit prop ramp in pct"

    Default: 10.0 %

    Range: 0% to 20%

    Increment: 0.1%

    Set the desired high limit proportional ramp.

    If you selected Network at Step 18 "High limit sensor", go to Step 23 "High limit max demand in pct".

21. "High limit humidty offset in pct"

    Default: 0% RH

    Range: -10% RH to 10% RH

    Increment: 0.1% RH

    Adjust the relative humidity reading of the room.

22. "High limit signal range"

    Default: 2-10 Vdc

    Range: 0-10 Vdc, 2-10 Vdc

    Select the high limit signal range.

23. "High limit max demand in pct"

    Default: No default (information display only)

    Displays the actual reading of the high limit sensor.

24. "end of season delay in hr"

    Default: 100 hours

    Range: 100 to 250 hours

    Increment: 5 hours

    This option does not appear if you have selected econo mode at Step 4 "econo mode". Indicates that the isolation valve will be turned off after 100 hours if there is no demand.

25. "service delay in hr"

    Default: 5000 hours

    Range: 1000 to 5000 hours

    Increment: 500 hours

    Set the number of hours running at 100% capacity before servicing is due.

26. "service runtime in hr"

    Default: No default (information display only)

    Displays the running time in hours at 100% capacity since the last service has been performed. To reset this value to 0 and reset any associated alarms, press the edit ⭐ button and then press and hold both ▲ and ▼ arrow keys.

27. "runs while service alarm"

    Default: ACt (active)

    Range: INACt (Inactive), ACt (active)

    Select ACt to enable the system to run even when the servicing is due.

28. "total runtime in hr"

    Default: No default (information display only)

    Displays the running time in hours at 100% capacity.

29. "auto baud rate"

    Default: ON

    Range: ON, OFF

    This option is available only on SKDESC-MB and SKDESC-MD models. Enable or disable Auto Baud Rate detection. When enabled, the controller automatically configures its baud rate by detecting the network speed upon connection to the network. When disabled, you must manually select the baud rate. (go to Step 30, "baud rate")

30. "baud rate"

    Default: No default (information display only)

    Range:

    • BACnet: 9.6k, 19.2k, 38.4k, 76.8k
    • Modbus: 9.6k, 19.2k, 38.4k, 57.6k

    This option is available only on SKDESC-MB and SKDESC-MD models. If you selected ON at Step 29 "auto baud rate", the baud rate is detected and displayed automatically. If you selected OFF at Step 29 "auto baud rate", select the baud rate value from the available options.

31. "network address"

    BACnet Default: 0 Range: 0 to 254

    Modbus Default: 1 Range: 1 to 246

    This option is available only on SKDESC-MB and SKDESC-MD models. Select the desired address.

32. “adjust device instance”

    Default: 0153001

    Range: No, Yes

    To change the device instance, select Yes. If you select No, the device instance will be modified automatically according to the MAC address.

33. "network parity"

    Default: None

    Range: None, Odd, Even

    This option is available only on SKDESC-MD model. Select the desired parity control from the available options.

34. “network stop bits"

    Default: 1

    Range: 1,2

    This option is available only on SKDESC-MD model. Select the desired network stop bits.

35. "Network fallback timeout"

    Default: 0 sec

    Range: 0 to 900 sec

    Increment: 1 sec

    This option appears if you've set one of the inputs to Net at Step 7 "Control Mode". Set the desired network fallback timeout.

36. "Network fallback setpoint"

    Default: 0.0%

    Range: 0% to 100%

    Increment: 0.1%

    This option appears if you've set one of the inputs to Net at Step 7 “Control Mode”. Set the desired network fallback setpoint.

37. "Network fallback counter"

    Default: 0 sec

    Range: 0 to 900 sec

    Increment: 1 sec

    This option appears if you've set one of the inputs to Net at Step 7 “Control Mode”. Set the desired network fallback counter.

38. "control output signal in mv"

    Default: No default (information display only)

    Displays the control valve output in mV.

39. "isolat valve output state”

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    Displays whether the isolating valve is open or closed.

40. "alarm relay output state"

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    Displays whether the alarm relay is open or closed.

41. “steam on output relay output state”

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    Displays whether the steam output relay is open or closed.

42. "separat temper input signal in mv"

    Default: No default (information display only)

    Displays the separator temperature sensor reading in mV.

43. "demand input signal in mv"

    Default: No default (information display only)

    This option appears only if you've selected Extern at Step 7 "Control Mode". Displays the reading of demand in mV.

44. “room humidity input signal in mv"

    Default: No default (information display only)

    This option does not appear if you've selected OFF at Step 9 “network room humidty". Displays the relative humidity reading of the room in mV.

45. "setpnt input signal in mv”

    Default: No default (information display only)

    This option appears only if you've selected ON at Step 12 “Externa Humidty Setpnt". Displays the setpoint reading in mV.

46. "high limit input signal in mv"

    Default: No default (information display only)

    This option appears only if you've selected Analog at Step 18 "High limit sensor". Displays the high limit sensor reading in mV.

47. "extern demand input state"

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    This option appears only if you've selected Extern at Step 7 "Control Mode". Displays if the demand is open or closed.

48. "air flow input state"

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    Displays if the air flow switch is open or closed.

49. "high limit switch input state”

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    This option appears only if you've selected Digital at Step 18 "High limit sensor". Displays if the high limit switch is open or closed.

50. "intrlck input state"

    Default: No default (information display only)

    Range: INACt (closed), ACt (open)

    Displays if the interlock is open or closed.

51. "micro temper"

    Default: No default (information display only)

    Displays whether the microcontroller temperature is in °C or °F mode.

52. “PCB temper"

    Default: No default (information display only)

    Displays whether the PCB temperature is in °C or °F mode.

Alarms and Notifications

The following is a list of alarms and notifications displayed by the Steam Controller under different conditions. When each one of these occurs, the controller performs certain actions as described in the table. The alarm symbol, ⚠️, is displayed along with all the alarms and notifications.

Operation and Display

Power Up

Upon power up, the LCD illuminates and all segments appear for 2 seconds. The controller then displays its serial number, model, and revision for 2 seconds. In the Operation Mode, information is displayed automatically in sequence. Use the ▲, ▼ arrow keys to scroll quickly.

Humidity Levels

The following humidity levels are displayed:

• Humidity Setpnt in pct - Humidity setpoint in % RH
• Room Humidty in pct - Room humidity reading in % RH
• High limit Humidty in pct - Duct sensor reading in % RH

Control Parameters

The following control parameters are displayed:

• control demand in pct - Current demand of the total system capacity measured in %
• control output in pct - Current output of the total system capacity measured in %
• control demand - Current demand measured in kg/hr or lbs/hr
• control output - Current output measured in kg/hr or lbs/hr

Temperature Levels

The following temperature level is displayed:

• separat temper - Separator temperature measured in °C or °F

Initial Verification

⚠️ Any installation work must be carried out by suitably qualified personnel.

Installation

• Ensure that the humidifier is installed properly according to the installation manual.
• Check that steam distributors are properly installed into the ventilation duct.
• Ensure that there is no leakage on the Multi-Steam™ SD/HD piping.

Electrical

• Confirm that 24Vac is present between terminal block TB5, tabs 1&4 on the SKDESC-M Steam Controller.

Drain if Required

• If there is a steam trap on the header, confirm that the drain piping is properly connected with a pitch of at least 1¼" (6.5mm) per foot (300mm). Note: There is no header on the single tube channel configuration, thus no steam trap on the header.

Steam Supply

• Ensure that the steam supply is on.
• Ensure that there is no leakage on the steam piping when the steam supply is on.

Controls

• Ensure that a high limit duct humidistat is installed, properly connected to the SKDESC-M, and its setpoint is properly adjusted.
• Verify that the room humidistat or returned air duct humidistat is installed, properly connected to the SKDESC-M, and its setpoint is properly adjusted.
• Turn on the power at the disconnect switch.
• Confirm the control setup of the humidifier. The humidifier is factory set with EXTERNAL control setup, meaning humidity demand is controlled by the room or duct humidistat.
• Ensure that the type of signal (0-10 Vdc, 2-10 Vdc, or 4-20 mA) of the humidistat corresponds to the type set in the humidifier control setup.

Start-Up Procedure

Start-up

Proceed to start-up the humidifier as follows:

• Make sure that steam is supplied to the Multi-Steam™ SD/HD.
• Switch on the SKDESC-M.
• Make sure that there is no alarm. If the A6 alarm stays on, it indicates that steam is not reaching the separator or there is a problem evacuating condensate from the separator steam trap.
• Wait for a call for humidity or create it by setting the SKDESC-M "Control Mode" to Internal (step #7), and the "Externa Humidty Setpnt" to OFF (step #12). Then, adjust the setpoint to a higher value than the room humidity reading (operation mode B).
• Once the temperature is high enough, the control valve will open slowly.
• The start-up is complete and the humidifier is now functional.

Safety Test

• Check for steam or condensate leakage while the humidifier is in operation.
• Check the location and operation of the airflow switch in the system by stopping the fan or disconnecting the air pressure connection. With no air movement in the duct, the SKDESC-M will automatically stop the humidifier by closing the control valve.

Reset the Setpoint and Control Mode

• If the humidity setpoint is controlled by the SKDESC-M, reset the setpoint to the desired relative humidity % (set #20) as suits the room.
• If the humidity setpoint is controlled by another device than the SKDESC-M (typically by the BMS), set the internal control signal to OFF.

End

• The humidifier is ready for normal operation.

Notes

This section is intentionally left blank for user notes.

Contact Information

Neptronic

400 Lebeau blvd, Montreal, Qc, H4N 1R6, Canada

www.neptronic.com

Toll free in North America: 1-800-361-2308

Tel.: (514) 333-1433

Fax: (514) 333-3163

Customer service fax: (514) 333-1091

Monday to Friday: 8:00am to 5:00pm (Eastern time)