Neptronic SKG4-N1101 N/P Manual

SKG4-N-ESL-181116
Gas Fired Humidifier
SKG4-N Series
Installation Instructions and User Manual
READ AND SAVE THESE INSTRUCTIONS
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SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
www.neptronic.com
Page | - 1 -
Safety
What To Do If You Smell Gas!
Do not try to light any appliance.
Do not touch any electrical switch; do not use any telephone in your building.
Immediately call your gas supplier from an off-site telephone.
Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire brigade.
Gas
Before installation, check that the local distribution conditions, nature of gas and pressure, and the
current state adjustment of the appliance are compatible.
Improper installation, adjustment, alteration, service, maintenance or use can cause carbon
monoxide poisoning, explosion, fire, electrical shock or other conditions which may cause
personal injury or property damage.
This appliance MUST be used only in sufficiently ventilated space. Consult instructions before
installation and use of this appliance
Installation and service MUST be performed by a qualified gas installer, service agency, or the gas
supplier.
Ensure that local regulations concerning the provision of gas installations are followed.
Electricity
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.
Ensure that the local regulations concerning the provision of electrical installations are followed.
Health and Safety
Neptronic has considered the aspects of the design of their humidification systems to reduce as much as possible the risk
of Legionnaires’ disease and other similar conditions, but it is important that users are also aware of their responsibilities
under Health and Safety regulations in reducing the risk of legionellosis.
To prevent the growth of Legionella, users are required to:
Avoid water temperature that favours the growth of Legionella 68-113˚F (20-45˚C).
Avoid water stagnation.
Clean and disinfect the humidification system in accordance to Health and Safety regulations and enclosed
instructions.
Have a competent person carry out a risk assessment of the water system supplying the humidifier, to ensure that
the water supply is of an acceptable quality.
Correct Use
Neptronic systems and products are designed only for humidification use.
Any other application is not considered as usage for the intended purpose. The manufacturer cannot be made liable for any
damage resulting from incorrect use.

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 2 -
Access
The SKG4 cabinet keys MUST never be left in the door locks, as this may cause unauthorized access to live electrical
parts. Always store keys centrally with a nominated responsible person.
Water
Neptronic systems are designed to be used with tap, reverse osmosis or deionized water. On no account must any other
fluids or chemicals be introduced into the system without first consulting Neptronic or its authorized distributor.
Water supply must not exceed the max pressure of 70 psig (480kPa) or pressure limits laid out in the specification and
installation must comply with local regulations. Your attention is drawn to your responsibilities as outlined in the Health and
Safety regulations. The control of Legionella bacteria in water systems and your SKG4 humidifier must be included in the
risk assessment of the water system in your building as a whole. In particular, if the humidifier is turned off for prolonged
periods, you must ensure that the unit is drained and that stagnation is avoided in pipe work supplying it.
A competent individual or organization must be appointed to carry out water tests. A wide range of different tests are
available to identify the presence of microbes in water, including total viable count (TVC), temperature-range specific tests
and identification of particular species types including Legionella. It is the responsibility of the person on whom the statutory
responsibility falls to determine the type and frequency of this and all other controls and preventative measures outlined in
this manual.

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 3 -
Foreword
Neptronic Company Overview
Founded in 1976, we’re 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 80,000 ft2(7,500 m2) state-of-the-art
facility located in Montreal, Canada. Using a vertical integration model, 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.
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 70% 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 SKG4 humidifier.
The strict application of these instructions will ensure the 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 installation and connection to local water supply.
This product has been declared to conform to the applicable Canadian and American safety standards and directives and
bear the ETL (c) & (us) mark. The Certificate for ETL is available, upon request to the manufacturer.
2018©: All rights reserved. This document cannot be reproduced totally or partially by any means whether, electronic,
mechanical, photocopy, recording or other, without prior written authorization of Neptronic.
Correct Use
Neptronic systems and its products are designed only for humidification 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.
General Warranty
This product is subject to the terms and conditions described at http://www.neptronic.com/Sales-Conditions.aspx.

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 4 -
Contents
Overview....................................................................................................................................................................................6
Handling and Lifting...............................................................................................................................................................6
List of Accessories Supplied..................................................................................................................................................7
Other Related Documents .....................................................................................................................................................7
Technical Specifications ........................................................................................................................................................7
Visual Overview .....................................................................................................................................................................8
Standard Humidifier Unit........................................................................................................................................................9
Position and Dimension of Connections ..........................................................................................................................10
Option - Ducted Combustion Air Inlet Dimensions ..............................................................................................................11
Weather Proof Enclosure.....................................................................................................................................................12
Multiple Module Composition...............................................................................................................................................13
Installation Overview ...............................................................................................................................................................14
Installation Method Statement.............................................................................................................................................14
Installation Steps..............................................................................................................................................................14
Stage 1 - Unit Positioning and Mounting.................................................................................................................................15
General Recommendations.................................................................................................................................................15
Location............................................................................................................................................................................15
Positioning........................................................................................................................................................................15
Ambient Condition and Altitude ...........................................................................................................................................16
Minimum Clearances...........................................................................................................................................................16
Minimum Clearances - Weather Proof Enclosure ...............................................................................................................17
Weather Proof Enclosure Installation on Floor/Roof ...........................................................................................................18
Weather Proof Enclosure Installation on Roof Curb............................................................................................................18
Stage 2 - Steam Distribution Installation.................................................................................................................................19
Fundamental Design Concepts ...........................................................................................................................................19
Weather Proof Enclosure Steam Outlets.............................................................................................................................20
Steam Outlet Dimension and Quantity - Weather Proof Enclosure.................................................................................20
Steam Dispersion General Recommendations ...................................................................................................................21
Selection of Steam Distribution Manifolds...........................................................................................................................21
S.A.M.E2 System.................................................................................................................................................................21
Positioning the S.A.M.E2 .................................................................................................................................................21
Steam Pipe Work to Duct Connections with S.A.M.E2....................................................................................................23
Multi-Steam System.............................................................................................................................................................24
Selection of Multi-Steam System.....................................................................................................................................24
Steam Pipe Work to Duct Connections with Multi-Steam................................................................................................25
Stage 3 - Gas Supply Connection...........................................................................................................................................27
Gas Pipe Diameter...............................................................................................................................................................28
Gas Leak Test......................................................................................................................................................................28
Stage 4 - Water Supply Installation.........................................................................................................................................29
Water Inlet Specifications ....................................................................................................................................................29
Water Supply Line Installation .............................................................................................................................................29
Stage 5 - Water Drain Connection ..........................................................................................................................................30
Water Drain Specifications ..................................................................................................................................................30
Water Drain Installation........................................................................................................................................................30

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 5 -
Pan Drain Connection on Weather Proof Enclosure .......................................................................................................31
Weather Proof Enclosure Water Drain Valve...................................................................................................................31
Stage 6 - Combustion Air Installation......................................................................................................................................32
Combustion Air Specification - Natural Ventilation..............................................................................................................33
Natural Ventilation Installation .........................................................................................................................................34
Ducted Combustion Air........................................................................................................................................................34
Stage 7 - Flue Gas Venting Connection..................................................................................................................................37
Approved BH Vent Systems ................................................................................................................................................37
Flue Gas Venting Specification............................................................................................................................................38
Flue Gas Terminal ...............................................................................................................................................................38
Minimum Spacing.............................................................................................................................................................39
Stage 8 - Electrical Supply and Installation.............................................................................................................................40
Electrical Power Supply.......................................................................................................................................................40
Stage 9 - Electrical Control Connections.................................................................................................................................41
Electrical Control Connections.............................................................................................................................................41
Safety Contact Connections ................................................................................................................................................41
Dry Contacts ........................................................................................................................................................................41
Humidifier Control................................................................................................................................................................42
Analog Signals .................................................................................................................................................................42
Humidity Control by Humidistat (External Mode).............................................................................................................42
Humidity Control by Humidifier (Internal Mode)...............................................................................................................43
Humidity Control by External Signal ................................................................................................................................44
Network Communication......................................................................................................................................................45
Controls Placement (Steam Dispersed into a Duct or AHU)...............................................................................................46
Controller Configuration ..........................................................................................................................................................47
Control Panel Features........................................................................................................................................................47
Idle Screen...........................................................................................................................................................................48
Menu Access .......................................................................................................................................................................48
Menu Navigation and Configuration ....................................................................................................................................49
Menu - General ................................................................................................................................................................50
Menu - User......................................................................................................................................................................53
Menu - Service.................................................................................................................................................................54
Menu - Installation............................................................................................................................................................55
Menu - Integration............................................................................................................................................................57
List of Alarms.......................................................................................................................................................................59
Start-up Procedure..................................................................................................................................................................60
Initial Verification..................................................................................................................................................................60
Start-Up................................................................................................................................................................................61
Service.....................................................................................................................................................................................62
Cleaning the Humidifier........................................................................................................................................................62
Chamber Removal - Humidifier with OSHPD Preapproval (OSP) ......................................................................................64
Inspecting the Humidifier Components................................................................................................................................65
Burner Assembly and Heat Exchanger Tube Maintenance.................................................................................................66
Burner Maintenance.............................................................................................................................................................66
Troubleshooting.......................................................................................................................................................................67

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 6 -
Overview
Handling and Lifting
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 has been checked by a
competent Health and 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 SKG4 humidifier MUST be handled and lifted with care at all times and remain in its original
packaging for as long as possible, prior to installation.
The SKG4 humidifier package may be carried using a forklift from the underside. Exercise caution before
lifting to ensure that the load is balanced.
The optional weather proof enclosure is provided with four (4) lifting eyelets located at each corner on
top of the enclosure.
Refer to the Dimensions and Weight table in the Standard Humidifier Unit section for system dry weights.
4 lifting eyelets
Illustration 1 - Lifting (Weather Proof Enclosure)
Unpacking
The SKG4 humidifier is shipped in a wooden crate. Ensure packing wooden crate and skid is removed prior to
commissioning.

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 7 -
List of Accessories Supplied
The following accessories are supplied with the SKG4 humidifier:
2 sets of keys.
2 adjustable steam hose collars per module to connect on the steam output (standard enclosure).
2 adjustable steam hose collars per internal steam manifold (weather proof enclosure option).
1 Installation Instructions and User Manual.
Other Related Documents
Wiring Diagram
Combustion Field Adjustment Instructions
BACnet Communication Module User Guide (for humidifiers with BACnet option)
Modbus Communication Module User Guide (for humidifiers with Modbus option)
Technical Specifications
Table 1 - Technical Specifications
Model
No. of
Modules
Steam
Capacity
(lb/h)
[kg/h]
Input Capacity
(btu/h) [kW]
Current
at 120V
(A)
Current
at 208V
(A)
Current
at 240V
(A)
No. of
Outlets
Multi-Steam
Header
Diameter
(in) [mm]
Natural Gas
Propane Gas
SKG4-N1101 N/P
1
110
[50]
166,798
[49]
188,298
[55]
6.0
3.5
3.0
1
3
[76]
SKG4-N1551 N/P
1
155
[70]
210,052
[62]
231,552
[68]
6.0
3.5
3.0
1
3
[76]
SKG4-N1801 N/P
1
180
[80]
235,844
[69]
257,344
[75]
6.0
3.5
3.0
1
3
[76]
SKG4-N2101 N/P
1
210
[95]
247,423
[73]
268,923
[79]
6.0
3.5
3.0
1
3
[76]
SKG4-N2652 N/P
2
265
[120]
376,850
[110]
419,850
[123]
9.0
5.2
4.5
2
4
[100]
SKG4-N3102 N/P
2
310
[140]
420,104
[123]
463,104
[136]
9.0
5.2
4.5
2
4
[100]
SKG4-N3502 N/P
2
350
[160]
457,475
[134]
500,475
[147]
9.0
5.2
4.5
2
4
[100]
SKG4-N4052 N/P
2
405
[185]
494,846
[145]
537,846
[158]
9.0
5.2
4.5
2
4
[100]
SKG4-N5053 N/P
3
505
[230]
693,319
[203]
757,819
[222]
12.0
7.0
6.0
3
5
[125]
SKG4-N5603 N/P
3
560
[255]
704,898
[207]
769,398
[225]
12.0
7.0
6.0
3
5
[125]
SKG4-N6103 N/P
3
610
[275]
742,269
[218]
806,769
[236]
12.0
7.0
6.0
3
5
[125]
SKG4-N7104 N/P
4
710
[320]
940,742
[276]
1,026,742
[301]
15.0
8.7
7.5
4
(2x) 4
[100]
SKG4-N7654 N/P
4
765
[345]
952,321
[279]
1,038,321
[304]
15.0
8.7
7.5
4
(2x) 4
[100]
SKG4-N8104 N/P
4
810
[370]
989,692
[290]
1,075,692
[315]
15.0
8.7
7.5
4
(2x) 4
[100]
Note 1: Maximum static duct pressure is 5” w.c. (1.25 kPa). For higher static duct pressures, consult
Neptronic or its authorized distributor.
Note 2: Standard humidifier is designed for natural ventilation combustion air. “Ducted Combustion Air”
option is available upon request. See Stage 6 of installation procedure for more details.

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 8 -
Visual Overview
316SS Combustion chamber
and heat exchanger
Electrical power
connection
Steam outlet
Flue vent connection
(either side)
Gas supply inlet
(either side)
Water supply
(either side)
316SS Evaporation chamber
(shown in “DOWN” position)
Front door
Drain outlet
(either side)
Quick connect water outlet
Back door
Water level sensor
Controller
Illustration 2 - Humidifier Overview

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 9 -
Standard Humidifier Unit
B
C
A
F
G
H
I
F
F
E
D
Illustration 3 - Standard Humidifier
Table 2 - Dimensions and Weight (Standard Humidifier)
Model
No. of
Modules
Steam Outlet
Dimensions (in) [mm]
Weight
(lb) [kg]
Qty
Dia.
(in) [mm]
A
B
C
D
E
F
G
H
I
Empty
Full of
Water
SKG4-N1101 N/P
SKG4-N1551 N/P
SKG4-N1801 N/P
SKG4-N2101 N/P
1
1
Ø76
54
[1372]
24
[610]
22
[560]
11
[280]
19
[470]
-
-
-
-
320
[145]
441
[200]
SKG4-N2652 N/P
SKG4-N3102 N/P
SKG4-N3502 N/P
SKG4-N4052 N/P
2
2
Ø76
54
[1372]
48
[1220]
22
[560]
11
[280]
19
[470]
24
[610]
43
[1080]
-
-
604
[274]
847
[384]
SKG4-N5053 N/P
SKG4-N5603 N/P
SKG4-N6103 N/P
3
3
Ø76
54
[1372]
72
[1830]
22
[560]
11
[280]
19
[470]
24
[610]
43
[1080]
67
[1690]
-
950
[431]
1322
[600]
SKG4-N7104 N/P
SKG4-N7654 N/P
SKG4-N8104 N/P
4
4
Ø76
54
[1372]
96
[2440]
22
[560]
11
[280]
19
[470]
24
[610]
43
[1080]
67
[1690]
91
[2300]
1270
[576]
1764
[800]

SKG4-N Gas Fired Humidifier
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Page | - 10 -
Position and Dimension of Connections
Main Drain
Pan Drain Water Supply Gas Supply
Front Door
Flue Outlet
22 1/16"
(560mm)
18 13/16"
(478mm) 9 13/16”
(249mm)
5 1/16"
(129mm)
52 3/16"
(1326mm)
49"
(1245mm)
11 5/16"
(287mm)
16 5/8"
(422mm)
Illustration 4 - Position of Connections
Table 3 - Dimensions of Connections (Standard Humidifier)
Model
No. of
Modules
Dimensions (in) [mm]
Drain Outlet
Diameter
Pan Drain
Diameter
Water Inlet
Diameter
Gas Inlet
Diameter
Flue Outlet
Diameter
SKG4-N1101 N/P
SKG4-N1551 N/P
SKG4-N1801 N/P
SKG4-N2101 N/P
1
Ø3/4
[20]
Ø1/2
[15]
Ø1/2
[15]
Ø1
[25]
Ø3
[76]
SKG4-N2652 N/P
SKG4-N3102 N/P
SKG4-N3502 N/P
SKG4-N4052 N/P
2
Ø1 ½
[40]
Ø1/2
[15]
Ø1/2
[15]
Ø1
[25]
Ø4
[100]
SKG4-N5053 N/P
SKG4-N5603 N/P
SKG4-N6103 N/P
3
Ø1 ½
[40]
Ø1/2
[15]
Ø1/2
[15]
Ø1 ½
[40]
Ø5
[125]
SKG4-N7104 N/P
SKG4-N7654 N/P
SKG4-N8104 N/P
4
Ø1 ½
[40]
Ø1/2
[15]
Ø1/2
[15]
Ø1 ½
[40]
Ø5
[125]
Note: Drain outlet, water supply inlet, gas supply inlet and flue outlet are located on the right hand side of
the humidifier. Left hand side location of any of these outlets or inlets is available upon request.

SKG4-N Gas Fired Humidifier
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Page | - 11 -
Option - Ducted Combustion Air Inlet Dimensions
K
L
L
L
M
N
O
J
6"
(150mm)
Illustration 5 - Ducted Combustion Air Inlet Dimensions
Table 4 - Dimensions and Weight (Ducted Combustion)
Model
No. of
Modules
No. of Air
Inlet(s)
Air Inlet
Dia.
(in)[mm]
Dimensions (in) [mm]
J
K
L
M
N
O
SKG4-N1101 N/P
SKG4-N1551 N/P
SKG4-N1801 N/P
SKG4-N2101 N/P
1
1
Ø2
[51]
17.6
[448]
13.8
[352]
-
-
-
-
SKG4-N2652 N/P
SKG4-N3102 N/P
SKG4-N3502 N/P
SKG4-N4052 N/P
2
2
Ø2
[51]
17.6
[448]
13.8
[352]
24
[609]
37.8
[962]
-
-
SKG4-N5053 N/P
SKG4-N5603 N/P
SKG4-N6103 N/P
3
3
Ø2
[51]
17.6
[448]
13.8
[352]
24
[609]
37.8
[962]
61.8
[1571]
-
SKG4-N7104 N/P
SKG4-N7654 N/P
SKG4-N8104 N/P
4
4
Ø2
[51]
17.6
[448]
13.8
[352]
24
[609]
37.8”
[962]
61.8
[1571]
85.8
[2180]

SKG4-N Gas Fired Humidifier
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Page | - 12 -
Weather Proof Enclosure
T
W
U
V
Dimensions (1 to 3 Module Configuration)
W
U
V
T
Dimensions (4 Module Configuration)
STEAM OUTLET
FLUE TERMINAL
61"
(1549mm)
8-7/8"
(225mm)
67-7/8"
(1724mm)
7-7/8" (200mm)
4-1/8" (105mm)
14-1/8" (359mm)
18-5/8" (473mm)
ELECTRICAL
CONTROL
POWER SUPPLY
COMBUSTION
AIR INLET
FRONT DOOR
GAS SUPPLY
WATER SUPPLY
DRAIN
Connections (1 to 3 Module Configuration)
Connections (4 Module Configuration)
Illustration 6 - Weather Proof Enclosure
Table 5 - Dimensions and Weight (Weather Proof Enclosure)
Model
No. of
Modules
Dimensions (in) [mm]
Weight (lb) [kg]
T
U
V
W
Empty
Full of
Water
SKG4-N1101 N/P
SKG4-N1551 N/P
SKG4-N1801 N/P
SKG4-N2101 N/P
1
74.7
[1898]
30.6
[778]
33.25
[845]
29
[736]
627
[285]
748
[340]
SKG4-N2652 N/P
SKG4-N3102 N/P
SKG4-N3502 N/P
SKG4-N4052 N/P
2
74.7
[1898]
56.5
[1434]
33.25
[845]
29
[736]
1038
[472]
1280
[582]
SKG4-N5053 N/P
SKG4-N5603 N/P
SKG4-N6103 N/P
3
74.7
[1898]
82.3
[2091]
33.25
[845]
29
[736]
1436
[653]
1800
[818]
SKG4-N7104 N/P
SKG4-N7654 N/P
SKG4-N8104 N/P
4
74.7
[1898]
56.5
[1435]
63.9
[1623]
53.7
[1364]
1826
[830]
2310
[1050]

SKG4-N Gas Fired Humidifier
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Page | - 13 -
Multiple Module Composition
Illustration 7 - Multiple Module Humidifier
Table 6 - Multiple Module Composition
Model
No. of
Modules
Module Model Number and Quantity
SKG100
SKG150
SKG180
SKG200
SKG4-N1101 N/P
1
x1
SKG4-N1551 N/P
1
x1
SKG4-N1801 N/P
1
x1
SKG4-N2101 N/P
1
x1
SKG4-N2652 N/P
2
x1
x1
SKG4-N3102 N/P
2
x2
SKG4-N3502 N/P
2
x1
x1
SKG4-N4052 N/P
2
x2
SKG4-N5053 N/P
3
x1
x1
x1
SKG4-N5603 N/P
3
x1
x2
SKG4-N6103 N/P
3
x3
SKG4-N7104 N/P
4
x1
x1
x2
SKG4-N7654 N/P
4
x1
x3
SKG4-N8104 N/P
4
x4
Module 4
Module 1
(Master)
Module 2
Module 3
SKG4 Humidifier
(with 4 modules)

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
www.neptronic.com
Page | - 14 -
Installation Overview
Installation Method Statement
WARNING: Risk of electric shock. Disconnect the appliance from electric supply before
commencing installation.
Note: All installation work must conform to local codes and regulations.
All work related to the installation of the SKG4 humidifier MUST only be performed by skilled and qualified
technical personnel (e.g. qualified gas installer, fitters, electricians, plumbers or technicians with
appropriate training).
The customer is responsible for ensuring their suitability.
For the installation of the SKG4 humidifier and its associated components, no special tooling is required
above that of a fitter’s toolkit.
Installation Steps
Stage 1: Unit Positioning and Mounting
Stage 2: Steam Distribution Installation
Stage 3: Gas Supply Connection
Stage 4: Water Supply Installation
Stage 5: Water Drain Connection
Stage 6: Combustion Air Installation
Stage 7: Flue Gas Venting Connection
Stage 8: Electrical Supply and Installation
Stage 9: Electrical Control Connections
Stage 9
Stage 8
Stage 1
Stage 2
air
Stage 6
or Stage 7
air
air
Stage 5
Stage 3
Stage 4
air
air
air
Illustration 8 - Installation Overview

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Stage 1 - Unit Positioning and Mounting
General Recommendations
Any installation work MUST be carried out by suitably qualified personnel.
Location
Consider the following points before deciding the location for the SKG4 humidifier:
Locate the SKG4 humidifier in an area clear of combustible materials, gasoline, and other flammable vapours and
liquids. Do not install in potentially explosive or flammable atmospheres laden with grain dust, sawdust, or similar
airborne materials.
If the appliance is installed in an insulated area, it must be kept free and clear of insulating materials, as they may
be combustible. If insulation is added after the humidifier is installed, an inspection of the humidifier area must be
carried out to ensure that there is no insulation coming into contact with the humidifier.
Provide adequate room ventilation air in accordance with local codes and regulations.
With the exception of ducted combustion air installation, do not locate units in tightly sealed rooms or small
compartments without provision for adequate air for combustion and room ventilation.
Combustion and ventilation air must be supplied through one permanent low-level and one permanent high-level
opening communicating directly with the outside air.
Humidifier flue gases must be vented to the outdoors. Locate the humidifier as near as possible to an outside wall
or roof so that the flue pipe from the humidifier is short and direct.
Locate the SKG4 humidifier on a water proof floor or install a drain pan beneath the humidifier.
The humidifier must be installed in a way that ensures the steam hose length is kept to the shortest possible length.
Consider the total steam line length between the humidifier and the steam distributor based on the steam line
material type:
oFor flexible steam hose, total steam line must not exceed 16ft (5m).For longer distances, use insulated hard
piping.
oFor insulated hard piping, the total steam line is determined by the humidifier capacity: one equivalentfoot for
each lb/hr capacity of the humidifier (0.67 m for each kg/hr), with a maximum of 50 feet (15 m). For longer steam
line runs, consult factory.
The humidifier must be installed in a way that ensures the steam hose length is kept to the shortest possible length.
The humidifier must be located in an area that is fully accessible for inspection and servicing. Observe the
minimum clearances as shown in the following sections.
Positioning
The humidifier is designed to be installed directly on the floor.
The humidifier is provided with adjustable legs in order to ensure proper level (standard enclosure only).
Provide a level, solid foundation for the humidifier.
Ensure that the floor beneath the humidifier is water proof to withstand any water spillage during servicing or in the
event of a problem.

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
www.neptronic.com
Page | - 16 -
Ambient Condition and Altitude
The humidifier location MUST have an ambient temperature of less than 86˚F (30˚C).
If the above condition is not respected for indoor humidifiers, the warranty of the unit will be void, as it has not been
designed to operate under extreme external conditions.
The combustion burner of the SKG4 humidifier is self-adjusting for any altitude; the burner will maintain proper
combustion and low emission at any altitude.
Steam capacity will be affected by altitudes over 3500ft (1050m) above sea level. Please refer to the table below to
anticipate the ratio of output reduction.
Table 7 - Output Reduction Based on Altitude
Altitude Above Sea Level
(ft) [m]
Output Reduction
(%)
0 to 3500
[0 to 1050]
0
3501 to 4500
[1051 to 1350]
2
4501 to 5500
[1351 to 1650]
4
5501 to 6500
[1651 to 1950]
6
6501 to 7500
[1951 to 2250]
8
Minimum Clearances
The following minimum clearances are indicated for inspection and servicing access. The SKG4 humidifier is
designed for a zero clearance to combustible materials.
Leave a clearance of at least 30” (0.8 m) to the front panel and 24” (0.6 m) on the left and right sides of the
humidifier.
Leave a clearance of at least 20” (0.5 m) on top of the humidifier.
24"(0.6m)
minimum
20" (0.5m)
minimum
30"(0.8m)
minimum
24"(0.6m)
minimum
Illustration 9 - Standard Enclosure Clearances

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Minimum Clearances - Weather Proof Enclosure
The following minimum clearances are indicated for inspection and servicing access. The SKG4 humidifier is
designed for a zero clearance to combustible materials.
Leave a clearance of at least 30” (0.8 m) to the front panel and 24” (0.6 m) on the left and right sides of the
humidifier.
Leave a clearance of at least 20” (0.5 m) on top of the humidifier.
24"(0.6m)
minimum
30"(0.8m)
minimum
20" (0.5m)
minimum
24"(0.6m)
minimum
Illustration 10 - Weather Proof Enclosure Clearances

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
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Page | - 18 -
Weather Proof Enclosure Installation on Floor/Roof
The base of the SKG4 humidifier must be secured to the floor/roof using ½” (12mm) diameter bolts and washers (not
supplied). Use the provided ½” (12mm) diameter holes to secure the SKG4 humidifier to the floor/roof.
Use Ø ½” (12mm) bolts and
washers (not supplied) to
secure the humidifier to the
floor/roof
Illustration 11 - Floor/Roof Installation
Weather Proof Enclosure Installation on Roof Curb
W
U
1/2xU
1/2xW
Ø ½” (12mm) to bolt
humidifer to roof curb
Illustration 12 - Roof Curb Installation
Ensure that the roof curb is structurally built to support the weight of the SKG4 humidifier. The roof curb must provide
proper level to the humidifier. The base of the weather proof enclosure is provided with holes of ½” (12mm) diameter to
secure the SKG4 humidifier to the roof curb, with the use of bolts and washers of ½” (12mm) diameter (not supplied).

SKG4-N Gas Fired Humidifier
Installation Instructions and User Manual
www.neptronic.com
Page | - 19 -
Stage 2 - Steam Distribution Installation
Fundamental Design Concepts
Follow these general installation rules in order to avoid any restrictions inside the distribution pipes and the humidifier, as
well as condensation accumulation, which can lead to severe water accumulation in the duct or a humidifier malfunction.
The minimum steam pipe gradient must be 7˚, i.e. 5” (125mm) rise in 40” (1m) run.
The total length of flexible steam hoses must not exceed 16ft (5m). For insulated rigid piping, it must not exceed
50ft (15m).
The lowest point of any steam hose or rigid pipe must be the humidifier. If the humidifier cannot be the lowest point
of the piping, install one or more steam traps (S Type) at the lowest point(s) of the steam supply piping. The steam
separator (S trap) must be installed higher than the static pressure of the system by at least 2” (51 mm).
Use rigid copper piping whenever possible. Flexible steam hoses can be used for short runs up to 16ft (5m) or for
interconnecting between rigid pipe runs. Ensure that there are no kinks and that the hose does not sag when using
flexible tubing. Do not use flexible hoses for curved portions of the steam line.
When using rigid copper pipe, insulation must be used to diminish condensation build up.
Incorrect Installation
Illustration 13 - Steam Distribution Pipes: Incorrect Installation
Min. 7°
Correct Installation
Single module humidifier with 2 S.A.M.E2 manifolds
Static pressure
+ 2" (50mm)
Min. 7°
Correct Installation
Single module humidifier
with Multi-Steam.
Static pressure
+ 2" (50mm)
Illustration 14 - Steam Distribution Pipes: Correct Installation
CAUTION: Risk of malfunction. Avoid kinks, sags and areas where condensate can be trapped.