Neptronic SKH4 Manual

SKH4-E-ESA-231208
SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
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SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
www.neptronic.com
Page | i
Foreword
Neptronic Company Overview
Founded in 1976, Neptronic is a private corporation that designs, manufactures and distributes products
for the HVAC industry. Our product line includes intelligent controllers, electronic actuators, actuated valves,
humidifiers and electric heaters.
Our products are designed and manufactured by over 250 dedicated employees in our 7,500 m2state-of-
the-art facility located in Montreal, Canada. Our entire manufacturing chain is under one roof from software
and hardware development to SMT circuit board assembly, to sheet metal fabrication, to product testing
ensuring that our products are engineered to last using a vertical integration model.
We currently hold several national and international patents, and with our continued commitment to
research and development, we provide innovative products and technologies for the ever-evolving
challenges of the HVAC industry. Exporting over 75% of our sales, we have an exclusive distribution
network around the globe that provides comprehensive solutions to our worldwide customers.
About the Manual
These installation and operation instructions have been developed to facilitate the installation of the SKH4
High-Pressure Atomizer humidifier.
•The strict application of these instructions ensures conformity of your installation and operation
as per the manufacturer's recommendations.
•The application of these instructions is one of the conditions for the application of the warranty.
•The application of these instructions does not ensure, at any time, conformity to procedures,
regulation or local codes, regarding electric connections and installation to local water supply.
This product has been declared to conform to applicable European safety and electromagnetic compatibility
standards and directives and bear the CE mark. The certificate of conformity CE is available upon request
to the manufacturer.
Copyright Information
Copyright ©2023 by Neptronic.
All rights reserved. This document cannot be reproduced wholly or partially by any means, whether
electronic, mechanical, photocopy, recording or other, without prior written authorization of Neptronic.

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
www.neptronic.com
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Health and Safety Instructions
General
This manual has been written to ensure correct, safe and sustainable operation of the SKH4 High-Pressure
Atomiser and is intended for use by engineers and technical personnel trained by or their official agents.
This manual must be read thoroughly before specifying, designing, installing or operating a SKH4 High-
Pressure Atomizer. Please retain for reference and contact Neptronic should you have any questions.
The triangular symbol with the word WARNING: is used to designate danger of severe or lethal
consequence.
The circular symbol with the word CAUTION: is used to designate danger of injury, or to warn
of the hazardous operating condition, or other relevant information.
Electrical Warning Message
WARNING:
Risk of electric shock. Do not access. Disconnect SKH4 High-Pressure Atomizer before opening the
electrical access door.
All work concerned with electrical installation MUST only be performed by skilled and qualified technical
personnel (such as an electrician or a technician with appropriate training). The customer is always
responsible for ensuring the suitability of the technical personnel.
Please observe the local regulations concerning the provision of electrical installations.
Health & Safety
Installation, maintenance, repair work or de-commissioning should only be carried out by appropriately
qualified technical personnel. Any risks or hazards relating to the system, including during installation and
maintenance, should be identified by a qualified Health & Safety representative who shall be responsible
for introducing effective control measures, as necessary. The customer is responsible for ensuring that the
installation of the equipment complies with all local regulations.
CAUTION: Maintenance personnel must be trained by Neptronic or their official agent, and it is
the customer’s responsibility to ensure their suitability. Failure to use qualified personnel may
lead to a hazardous operating condition.
WARNING: Danger of Electrocution! Danger of contact with live parts when the unit is open.
Always isolate all water and electrical supplies to the system before commencing any
maintenance or repair. Isolate power and water immediately if there are any signs of water
leaking from the unit.
Protective Equipment
Please refer to the Health and Safety Executive for recommendations about Personal Protective Equipment
and information on the Control of Substances Hazardous to Health (COSHH).

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
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Hygiene
IMPORTANT:
Refer to local Health and Safety regulation and codes on the control of Legionellosis in water systems. In
the absence of such, ASHREA guideline 12-2023 does provide recommendations. If not adequately
monitored and maintained, water systems can support the growth of microorganisms including the
bacterium that causes Legionnaires’ disease.
The SKH4 has been designed to reduce the potential risk of legionellosis growth. Users also share the
responsibility for reducing the risk of legionellosis; users are required to:
•Conduct a risk assessment of the complete water system.
•Implement proper control of the water system.
•Connect the SKH4 to a clean water supply main or higher quality water (such as RO).
•Avoid stagnant water.
•Avoid turning off the system without properly draining all conduit. Automatic drains are
scheduled in the unit to avoid the stagnant water.
•Avoid water temperatures that increase the risk of Legionella growth. (25°C to 45°C)
•Clean and disinfect the system regularly, at least once a year.
WARNING: Risk of Legionnaires’ disease, which can be fatal. Install and operate the SKH4
High-Pressure Atomizer as per the instructions given in this Installation Instructions and User
Manual.
WARNING: If the SKH4 High-Pressure Atomizer is turned off for prolonged periods (more
than 24 hours), ensure that any piping supplying the unit is drained, unless they supply other
systems which ensure a regular renewal of water in the system. Failure to do so may result
in stagnation of the water and contamination that might cause Legionnaires' disease, which
can be fatal.
It is the responsibility of the person on whom the statutory responsibility falls to determine all control and
preventative measures outlined in this manual.
Correct Use
Neptronic systems and products are designed only for humidification and cooling use. Any other application
is not considered appropriate for the intended purpose. The manufacturer cannot be made liable for any
damage resulting from incorrect use.
Important Start-Up Information
Before turning on and operating the SKH4 High-Pressure Atomizer:
•Read all instructions and installation procedures outlined in this manual. Ensure that the operation
of the system is properly understood before commencing the start-up procedure.
•Ensure that all wiring is properly installed and that all connections have been made correctly,
including the network communication cable between the pump station and the RVP(s).
•Verify all piping before starting up the system. As each zone may have a different capacity and the
system has been configured as such, connecting the wrong RVP output to a zone may lead to
erratic operation.
General Warranty
This product is subject to the terms and conditions described at www.neptronic.com/sales-conditions.aspx.

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
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Handling and Packaging
Lifting or Handling MUST be carried out by trained and qualified personnel. Ensure that
the lifting operation has been properly planned, assessed for risk and that the equipment
is checked by a qualified Health & Safety representative, and effective control measures
are in place.
It is the customer’s responsibility to ensure that the operators are trained in handling
heavy goods and to enforce the relevant lifting regulations.
The SKH4 High-Pressure Atomizer MUST always be handled and lifted with care and
should remain in its original packaging for as long as possible before installation.
The SKH4 High-Pressure Atomizer package may be carried using a forklift from the
underside. Caution should be exercised to ensure balanced load before lifting.
Correct Lifting Method
Any personnel handling or lifting the SKH4 High-Pressure Atomizer must follow the Lifting Operations and
Lifting Equipment Regulations 1998 and Approved Code of Practice L113. The regulation imposes duties
on employers and self-employed persons and authorities who have control, to any extent of lifting
equipment.
Inspection
Upon receipt, and once packaging material is removed, carry out an inspection to ensure that no damage
occurred during transit. Report any damage immediately to your Neptronic representative.
Unpacking
The SKH4 pump station is delivered in a crate. All other optional products, such as the distributors or the
remote valve panel are delivered separately in carton.

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
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Table of Contents
Handling and Packaging........................................................................................................................................... iv
Overview........................................................................................................................................................................7
Benefits......................................................................................................................................................................7
Features ....................................................................................................................................................................7
SKH4 System.................................................................................................................................................................8
Principle of Operation................................................................................................................................................8
SKH4 Pump Station.......................................................................................................................................................9
Visual Overview.........................................................................................................................................................9
Pump Unit Nomenclature.........................................................................................................................................11
Capacities and Power Consumption of Pump Unit (Brass)......................................................................................12
Capacities and Power Consumption of Pump Unit (SS)..........................................................................................12
Dimensions and Weight...........................................................................................................................................13
Fan-Assisted Distributors.............................................................................................................................................14
Fan-Assisted Distributors Nomenclature .................................................................................................................14
Capacities and Power of the Fan-Assisted Distributors...........................................................................................14
Fan-Assisted Distributors Dimensions and Weight..................................................................................................15
In-Duct Distribution Rack .............................................................................................................................................16
Basic Installation Overview..........................................................................................................................................17
Pump Unit Installation..................................................................................................................................................18
Step 1 –SKH4 Pump Station Installation ................................................................................................................18
General Recommendations .........................................................................................................................................18
Step 2 –Water Connections for the SKH4 Pump Station........................................................................................20
Step 3 –Power Supply Connections .......................................................................................................................22
Power Supply Connections on SKH4 Pump Station ....................................................................................................22
Power Supply Knockout Holes Location on SKH4 Pump Station.................................................................................23
Step 4 –Electrical Control Connections ..................................................................................................................24
Safety Contact Connections for Pump Unit..................................................................................................................24
Safety Contact Connections Single Zone Without TRUB.............................................................................................24
Safety Contact Connections per Zone from TRUB.......................................................................................................25
Network Communication..............................................................................................................................................26
Step 5 –Pump Controller Installation and Configuration.........................................................................................27
Idle Screen...................................................................................................................................................................28
Menu Access...........................................................................................................................................................28
Configuration parameters.............................................................................................................................................29
Control function............................................................................................................................................................29
Control Profile Selection...............................................................................................................................................29
Single Zone Operation .................................................................................................................................................29
Multi-Zones Operation..................................................................................................................................................30
Menu - General [Level 1 - No password required]........................................................................................................31
Menu - User Settings [Level 2 - Requires level 2 (or higher) password in order to access].........................................34
Menu - Service [Level 3 - Requires level 3 (or higher) password in order to access]...................................................36
Menu - Installation [Level 4 - Requires level 4 (or higher) password in order to access]..............................................37
Menu - Integration [Level 5 - Requires level 5 password in order to access] ...............................................................41
List of Alarms and Warnings....................................................................................................................................44
Distribution Installation.................................................................................................................................................45
Spraying in Space (Standard)......................................................................................................................................45
Spraying in Space with Fan-Assisted Distributors........................................................................................................47
Spraying in Duct...........................................................................................................................................................50
Optional –Remote Valve Panel (RVP) ........................................................................................................................51

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
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RVP Dimensions......................................................................................................................................................51
Location .......................................................................................................................................................................52
Positioning ...................................................................................................................................................................52
Wall Mounting ..............................................................................................................................................................52
Start-Up Procedure......................................................................................................................................................53
Initial Verification......................................................................................................................................................53
Diagnostic mode......................................................................................................................................................54
Servicing and Maintenance..........................................................................................................................................55
Preventative Maintenance .......................................................................................................................................55
Preventive Maintenance (continued) .......................................................................................................................56
Nozzle Cleaning.......................................................................................................................................................57
De-scaling the Droplet Separator.............................................................................................................................58

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
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Overview
The SKH4 High-Pressure Atomizer uses water through a high-pressure system to produce a fine mist with
a droplet size of less than 20µm. The ambient air absorbs the fine mist, and the SKH4 adapts to seasonal
changes to provide direct evaporative cooling in summer and humidification in winter. Additionally, the
SKH4 provides BACnet MS/TP communication, multi-zone operation (up to 4 zones) and remote
connection to the entire system from any zone.
Benefits
•Very low energy consumption
•Free cooling (up to 12°C)
•Hygienic operation
•Environmentally friendly
•Low pressure drop in ventilation conduit
Features
The following are the features of the SKH4 High-Pressure Atomizer:
•High pressure pump with recirculation valve integrated.
•Full stainless steel distribution valves and fittings.
•Corrosion resistant distribution network made of stainless steel pipe or nylon tube.
•BACnet communication (optional).
•User-friendly, menu-driven LCD (128 x 64).
•Real-time clock and SD card or USB key for schedule, trending, and history log.
•Firmware upgrade using an SD card or USB key.

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
www.neptronic.com
Page | 8
SKH4 System
Principle of Operation
The SKH4 High-Pressure Atomizer is a system for humidifying and cooling with a fine mist of water droplets.
The pump unit pressurizes the high-quality water until it reaches a pressure of 69bar, then distributes it
throughout a network of stainless steel pipes or nylon flexible conduits, which then distributes the
pressurized water as a fine mist. These water particles measure less than 20µm. This mist is then easily
absorbed into the air, providing humidification, and cooling, through the adiabatic evaporation process.
The SKH4 Pump Unit is equipped with a pump and a motor that can use an optional VFD in order to control
the pump speed. The regulation of the outlet pressure is assured mechanically by the pump, in order to
maintain a consistent and reliable outlet pressure, regardless of the configuration of stages open.
The unit is equipped with two analog manometers place in the front, one for the low pressure and one for
the high-pressure outlet. There are also digital manometers so that the controller can monitor those
pressures. The low pressure controls the input of water to the pump in order to protect the pump unit from
running dry. The high-pressure sensor monitors the output of the pump, in order to assure consistent mist
generation and detect leakage.
In case of unexpected shutdown and failure of valve that could create a water hammer coming back to the
pump, a pressure relief is placed in the recirculation loop. The relief valve prevents damage to the inlet of
the pump and the low-pressure components.
The distribution of high-pressure water is assured in the pump unit, or optionally from a remote valve panel,
with an array of configurable valves. Each pair of valves (one for the input and one for the drain) is assigned
at the installation to a capacity in mass per hour and to a control signal. The unit is able to receive up to 4
control signals in order to cover 4 different zones, which can also be split up into 6 stages in total.
The control signals are displayed either by using a thermostat in each zone that is connected to the unit or
by connecting through a BMS with a demand directly to the unit. The BMS can be connected via BACnet
or Modbus protocols.
The distribution of mist is accomplished by using anti-drip stainless steel nozzles which are designed to
create a cone of mist to shoot the water droplets directly into the air. The nozzles are either installed directly
in the space or in an AHU.
In-space distribution requires installing distribution piping (stainless steel or nylon flexible conduit), with a
fitting for each nozzle. Clearances are important between nozzles and any obstacle in the area, such as
trusses, columns and/or tall equipment. See the hydraulic and distribution design guide for more details.
In-space distribution can be facilitated with optional fan-assisted distributors. Those distributors allow
reduced absorption distances and improve the coverage of the distribution network.

SKH4 High-Pressure Atomizer
Installation Instructions and User Manual
www.neptronic.com
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SKH4 Pump Station
Visual Overview
Illustration 1 - SKH4 Enclosure