Neptronic SKG3-110-1 N/P Quick start guide

Gas Fired Humidifier
SKG3 Series
INSTALLATION INSTRUCTIONS
WARNING: Risk of fire or explosion. May
cause property damage, personal injury or loss
of life. Please follow installation instructions
carefully.
FOR YOUR SAFETY: Do not store or use
gasoline or other flammable vapors and liquids
in the vicinity of this appliance.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch,
and do not use telephones 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 department.
WARNING: Risk of injury or property damage.
Installation and service must be performed by a
qualified installer, service agency, or the gas
supplier.
4011008
Read and save these instructions
SKG3-IOM –Rev.: 180313

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
1
Safety
WHAT TO DO
IF YOU SMELL
GAS!
Do not try to light any appliances.
Do not touch any electrical switches; do not use any telephones 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 department.
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 (e.g. electrician or 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 &
SAFETY
Neptronic has considered 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.
To prevent the growth of Legionella, users are required to:
Avoid water temperature that favors the growth of Legionella (20-45˚C [68 to
113˚F]).
Avoid water stagnation.
Clean and disinfect the humidification system.
Have a competent person carry out a risk assessment of the water system
supplying the humidifier to ensure 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.
ACCESS
The SKG3 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,
demineralized or partially softened water. On no account attempt to introduce any
other fluids or chemicals into the system without first consulting Neptronic or its
authorized distributor.
Water supply must not exceed the max pressure of 70 psig (480 kPa), or pressure
limits laid out in the Installation Instructions and User Manual, and must comply with
local regulations.
!
!

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
2
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 7,500 m2 (80,000 ft2) 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 Gas Fired 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 applicable Canadian and American
standards and bear the ETL (c) & (us) marking.
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.
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.
Please observe the local regulations concerning the provision of electrical
installations.
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.

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
3
Table of Contents
Safety................................................................................................................................................. 1
Foreword ........................................................................................................................................... 2
Table of Contents.............................................................................................................................. 3
Technical Specifications .................................................................................................................. 4
Dimensions & Weights ..................................................................................................................... 5
Installation Overview ...................................................................................................................... 10
Stage 1 –Unit Positioning and Mounting...................................................................................... 11
Stage 2 –Steam Distribution Installation...................................................................................... 13
Stage 3 –Gas Supply Connection................................................................................................. 20
Stage 4 –Water Supply Installation............................................................................................... 21
Stage 5 –Water Drain Connection................................................................................................. 22
Stage 6 –Combustion Air Installation........................................................................................... 23
Stage 7 –Flue Gas Venting Connection........................................................................................ 28
Stage 8 –Electrical Supply and Installation.................................................................................. 30
Stage 9 –Electrical Control Connections ..................................................................................... 31
Stage 9 –BACnet®Interface Set-up............................................................................................... 34
Initial Verification............................................................................................................................ 35
Commissioning –Operation Description...................................................................................... 37
Operation Display........................................................................................................................... 38
Status Menu .................................................................................................................................... 39
Control Set-up Menu....................................................................................................................... 40
System Set-up Menu....................................................................................................................... 42
Alarms Menu ................................................................................................................................... 44
List of Alarms.................................................................................................................................. 45
Diagnostics Menu ........................................................................................................................... 46
Com Port Set-up Menu ................................................................................................................... 47
Personal Notes................................................................................................................................ 48
Exploded Views & Parts List.......................................................................................................... 49
Multiple Modules Composition Table............................................................................................ 54
Other related documents:
1. Start-up check list & Combustion field adjustment instructions
2. Wiring diagram
3. Service and troubleshooting guide
4. If humidifier is equipped with BACnet®option:
BACnet®communication module user guide.

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
4
Technical Specifications
General Overview - Fig.1
Model
Nb of
Modules
Steam
cap.
(lb/h)
[kg/h]
Input Capacity
(btu/h) [kW/h]
Current at
120Vac
(A)
Current at
208Vac
(A)
Current at
240Vac
(A)
Nb of
outlets
Multi-Steam
header diam.
(in) [mm]
Natural Gas
Propane Gas
SKG3-110-1 N/P
1
110
[50]
166,798
[49]
188,298
[55]
6.0
3.5
3.0
1
3’’
[76]
SKG3-155-1 N/P
1
155
[70]
210,052
[62]
231,552
[68]
6.0
3.5
3.0
1
3’’
[76]
SKG3-180-1 N/P
1
180
[80]
235,844
[69]
257,344
[75]
6.0
3.5
3.0
1
3’’
[76]
SKG3-210-1 N/P
1
210
[95]
247,423
[73]
268,923
[79]
6.0
3.5
3.0
1
3’’
[76]
SKG3-265-2 N/P
2
265
[120]
376,850
[110]
419,850
[123]
9.0
5.2
4.5
2
3’’
[76]
SKG3-310-2 N/P
2
310
[140]
420,104
[123]
463,104
[136]
9.0
5.2
4.5
2
4’’
[100]
SKG3-350-2 N/P
2
350
[160]
457,475
[134]
500,475
[147]
9.0
5.2
4.5
2
4’’
[100]
SKG3-405-2 N/P
2
405
[185]
494,846
[145]
537,846
[158]
9.0
5.2
4.5
2
4’’
[100]
SKG3-505-3 N/P
3
505
[230]
693,319
[203]
757,819
[222]
12.0
7.0
6.0
3
4’’
[100]
SKG3-560-3 N/P
3
560
[255]
704,898
[207]
769,398
[225]
12.0
7.0
6.0
3
4’’
[100]
SKG3-610-3 N/P
3
610
[275]
742,269
[218]
806,769
[236]
12.0
7.0
6.0
3
4’’
[100]
SKG3-710-4 N/P
4
710
[320]
940,742
[276]
1,026,742
[301]
15.0
8.7
7.5
4
4’’
[100]
SKG3-765-4 N/P
4
765
[345]
952,321
[279]
1,038,321
[304]
15.0
8.7
7.5
4
4’’
[100]
SKG3-810-4 N/P
4
810
[370]
989,692
[290]
1,075,692
[315]
15.0
8.7
7.5
4
4’’
[100]
Notes: 1 - Maximum static duct pressure is 5” w.c. (1.25 kPa). For higher static duct pressures, consult Neptronic or its
authorized distributor.
2 - Standard humidifier is designed for natural ventilation combustion air. “Ducted Combustion Air”option is available
upon request.

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
5
Dimensions & Weights
General dimensions - Fig. 2
General Dimensions, Weight & Steam Outlets detail
Model
Nb of
module
No of
Steam
Outlets
Steam
Outlet
Diam.
Dimensions in inches [mm]
Weight
Lb (Kg)
A
B
C
D
E
F
G
H
I
Empty
Full of
water
SKG3-110-1 N/P
SKG3-155-1 N/P
SKG3-180-1 N/P
SKG3-210-1 N/P
1
1
Ø3”
[76]
54
[1372]
24
[610]
22
[560]
9
[230]
18
[460]
320
[145]
444
[200]
SKG3-265-2 N/P
SKG3-310-2 N/P
SKG3-350-2 N/P
SKG3-405-2 N/P
2
2
Ø3”
[76]
54
[1372]
48
[1220]
22
[560]
9
[230]
18
[460]
24
[610]
36
[920]
602
[274]
850
[384]
SKG3-505-3 N/P
SKG3-560-3 N/P
SKG3-610-3 N/P
3
3
Ø3”
[76]
54
[1372]
72
1830]
22
[560]
9
[230]
18
[460]
24
[610]
36
[920]
66
[1680]
950
[431]
1,322
[600]
SKG3-710-4 N/P
SKG3-765-4 N/P
SKG3-810-4 N/P
4
4
Ø3”
[76]
54
[1372]
96
[2440]
22
[560]
9
[230]
18
[460]
24
[610]
36
[920]
66
[1680]
90
[2290]
1,270
[576]
1,766
[800]
B
A
C
E
F
F
F
D
G
H
I

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
6
Dimensions & Weights
Position & Dimension of connections
Connections position - Fig. 3
(dimensions in bracket are in mm)
Model
Nb of
module
Dimensions in inches [mm]
Drain
Outlet
Diam.
Pan
Drain
Diam.
Water
Inlet
Diam.
Gas
Inlet
Diam.
Flue
Outlet
Diam.
SKG3-110-1 N/P
SKG3-155-1 N/P
SKG3-180-1 N/P
SKG3-210-1 N/P
1
Ø3/4’’
[20]
ؽ”
[15]
ؽ”
NPT
[15]
Ø1” NPT
[25]
Ø3”
[76]
SKG3-265-2 N/P
SKG3-310-2 N/P
SKG3-350-2 N/P
SKG3-405-2 N/P
2
Ø1-½”
[40]
ؽ”
[15]
ؽ”
NPT
[15]
Ø1” NPT
[25]
Ø4”
[100]
SKG3-505-3 N/P
SKG3-560-3 N/P
SKG3-610-3 N/P
3
Ø1-½”
[40]
ؽ”
[15]
ؽ”
NPT
[15]
Ø1-½”
NPT
[40]
Ø5”
[125]
SKG3-710-4 N/P
SKG3-765-4 N/P
SKG3-810-4 N/P
4
Ø1-½”
[40]
ؽ”
[15]
ؽ”
NPT
[15]
Ø1-½”
NPT
[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.
14½’’ (370)
C=22'’ (560)
2'’ (51)
6'’ (152)
17'’ (436)
15'’ (378)
4'’ (102)
43½’’
(1105)
49½’’
(1257)
A=54'’
(1372)
1'’ (25)
Electrical
control
Power
supply
Flue
Gas
supply
Front
door
Main
Drain
Pan
drain
5'’ (127)
Water supply
10½’’ (270)

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
7
Dimensions & Weights
Option - Ducted combustion air inlet dimension
Ducted combustion air dimensions - Fig. 4
(dimensions in bracket are in mm)
Model
No of
modules
No of
Air
inlet
Dimensions in inches [mm]
Air
inlet
Diam.
J
K
L
M
N
O
SKG3-110-1 N/P
SKG3-155-1 N/P
SKG3-180-1 N/P
SKG3-210-1 N/P
1
1
Ø2’’
[51]
17.6’’
[448]
13.8’’
[352]
-
-
-
-
SKG3-265-2 N/P
SKG3-310-2 N/P
SKG3-350-2 N/P
SKG3-405-2 N/P
2
2
Ø2’’
[51]
17.6’’
[448]
13.8’’
[352]
24’’
[609]
37.8’’
[962]
-
-
SKG3-505-3 N/P
SKG3-560-3 N/P
SKG3-610-3 N/P
3
3
Ø2’’
[51]
17.6’’
[448]
13.8’’
[352]
24’’
[609]
37.8’’
[962]
61.8’’
[1571]
-
SKG3-710-4 N/P
SKG3-765-4 N/P
SKG3-810-4 N/P
4
4
Ø2’’
[51]
17.6’’
[448]
13.8’’
[352]
24’’
[609]
37.8’’
[962]
61.8’’
[1571]
85.8’’
[2180]
J
K
M
L
L
L
N
O
6'’(150)

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
8
Dimensions & Weights
Option - Weather proof enclosure general dimension and weight
Weather proof enclos.1 to 3 modules configuration - Fig. 5
Weather proof enclos. 4 modules configuration - Fig. 6
Weather proof enclosure.
Connection positions 1 to 3 modules- Fig. 7
(dimensions in bracket are in mm)
Weather proof enclosure
Connection positions 4 modules - Fig. 8
(dimensions in bracket are in mm)
Model
No of
modules
Dimensions in inches [mm]
Weight Lbs [Kg]
T
U
V
W
Empty
Full of
water
SKG3-110-1 N/P
SKG3-155-1 N/P
SKG3-180-1 N/P
SKG3-210-1 N/P
1
73-1/2’’
[1867]
25-1/2’’
[647]
33-1/8’’
[841]
24’’
[611]
627
[285]
748
[340]
SKG3-265-2 N/P
SKG3-310-2 N/P
SKG3-350-2 N/P
SKG3-405-2 N/P
2
73-1/2’’
[1867]
51-1/2’’
[1308]
33-1/8’’
[841]
24’’
[611]
1,038
[472]
1,280
[582]
SKG3-505-3 N/P
SKG3-560-3 N/P
SKG3-610-3 N/P
3
73-1/2’’
[1867]
77-1/4’’
[1963]
33-1/8’’
[841]
24’’
[611]
1,436
[653]
1,800
[818]
SKG3-710-4 N/P
SKG3-765-4 N/P
SKG3-810-4 N/P
4
73-1/2’’
[1867]
51-1/2’’
[1308]
63-5/8’’
[1616]
48-9/16’’
[1234]
1,826
[830]
2,310
[1,050]
T
U
V
W
W
TV
U
5'’ (128)
11-7/8'’ (302)
5-3/8'’(136)
65-5/8'’
(1667)
57-½'’
(1462)
6-7/8'’
(174)
DRAIN
WATER SUPPLY
GAZ SUPPLY
STEAM OUTLET
FLUE TERMINAL
POWER SUPPLY
ELECTRICAL
CONTROL
FRONT DOOR
COMBUSTION AIR
INLET
63-5/8"
(1616)
5 3/8" [136mm]
57-1/2"
[1462]
65-5/8"
[1667]
ELECTRICAL
CONTROL
POWER
SUPPLY
GAZ SUPPLY
WATER SUPPLY
DRAIN
STEAM OUTLET
(X2)
29-5/8" (751)
36-1/2" (926)
44" (1117)
FLUE TERMINAL
(X2)
COMBUSTION
AIR INLET

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
9
Handling & Unpacking
Lifting or handling MUST only be carried out by trained and qualified personnel.
Ensure that the lifting operation has been properly planned, risk assessed and that all
equipment has been checked by a skilled and competent Health & Safety
representative and that effective control measures have been put in place.
It is the customer’s responsibility to ensure that operators are trained in handling heavy
goods and that all relevant lifting regulations are enforced.
Refer to Dimensions & Weight section for system dry weights.
Handling and Lifting
The SKG3 Steam Humidifier MUST always be handled and lifted with care and must
remain in its original packaging for as long as possible prior to installation
The SKG3 Steam Humidifier package may be carried using a forklift from the
underside. Caution must be exercised to ensure balanced load before lifting.
Lifting of SKG3 Steam Humidifier MUST ALWAYS be done using the appropriate
Neptronic Lifting Bracket (sold separately).
Lifting sling angle must be greater than 30˚to the horizontal.
Optional weather proof enclosure is provided with four (4) lifting eyelets located at
each corner on the top of the enclosure, see fig. 10.
Standard enclosure lifting bracket - Fig. 9
Weather proof enclosure point for lifting - Fig. 10
Unpacking
SKG3 Steam Humidifier is shipped on a wooden crate.
Remove packing wooden crate and skids prior to commissioning.
List of Accessories
Supplied
Standard enclosure
Weather proof enclosure
2 sets of keys.
2 adjustable steam hose collars per
module to connect to connect on the
steam output.
2 adjustable steam hose collars
per internal steam manifold.
Startup check list & Combustion field adjustment instructions.
The present Installation Instructions and User Manual.
Wiring diagram affixed onto the interior of the front access door.
Service and troubleshooting guide.
BACnet® communication module user guide (if BACnet® option is installed).
!
4 lifting eyelets

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
10
Installation Overview
All installation work must comply with local regulations.
All work related to the installation of the SKG3 Steam 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.
To install the SKG3 Steam Humidifier and its associated components, no special
tooling is required above that of a fitter’s toolkit.
Installation
Method
Statement
Stage1: 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
Installation overview - Fig. 11
!
Stage 2
Stage 4
Stage 5
air
Stage 6 Stage 7
Stage 8
Stage 3 Stage 9
or
air
To drain
air
air
air
air
Stage 1

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
11
Stage 1 – Unit Positioning and Mounting
Safety
Considerations
Any installation work MUST be carried out by suitably qualified personnel.
The following considerations must be taken into account before deciding on the
location of the SKG3 Steam Humidifier:
Locate the SKG3 Steam Humidifier in an area clear of combustible
materials, gasoline, and other flammable vapors 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 close as possible to an outside wall or roof to
ensure that the flue pipe from the humidifier is short and direct.
Locate the SKGE3 Steam Humidifier on a water proof floor or install a drain
pan beneath the humidifier.
Positioning the
Humidifier
The humidifier must be installed in such a way to ensure that the steam hose
length is kept to the shortest possible length.
For flexible steam hoses: the total steam line length must not exceed 16 feet
(5 meters). For longer distances, use insulated hard piping.
For insulated hard piping: the total steam line length must not exceed 50 feet
(15 m). For longer steam line runs, consult factory.
The humidifier must be located in an area that is fully accessible for
inspection and servicing. Observe the minimum access distances as shown
in figures 12 & 13.
Ambient
Condition &
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 SKG3 Steam Humidifier combustion burner 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 3,500 feet (1,050 m) above sea
level. Please refer to the table below to anticipate the ratio of output reduction:
Altitude above sea level
(feet) [m]
Output reduction (%)
0 to 3500
[0 to 1050]
0
3501 to 4500
[1051 to 1350]
2
4501 to 5550
[1351 to 1650]
4
5501 to 6500
[1651 to 1950]
6
6501 to 7500
[1951 to 2250]
8
!

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
12
Stage 1 –Unit Positioning and Mounting
Standard enclosure clearance - Fig. 12
(dimensions in bracket are in mm)
Weather proof enclosure clearance - Fig. 13
(dimensions in bracket are in mm)
Minimum
Clearances
Minimum clearances are :
Standard enclosure
Weather proof enclosure
Top: 20’’ (51cm) minimum
Both sides: 24’’ (60cm) minimum
Front: 30’’ (80cm)minimum
Top: 20’’ (51cm) minimum
Connection side: 24’’ (60cm)
minimum
Front: 30’’ (80cm) minimum
Note: Above minimum clearances are indicated for inspection and servicing access.
The SKG3 Steam Humidifier is designed for 0 clearance to combustible materials,
except on top and front, where minimum clearances to combustible materials is
respectively 20’’ (510mm) and 29.9”(762mm).
The humidifier is designed to be installed directly on the floor.
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 if a problem occurs.
The humidifier is provided with adjustable legs in order to ensure proper level.
Roof Curb for
Weather Proof
Enclosure
Weather proof enclosure base dimensions - Fig. 14
(dimensions in bracket are in mm)
Ensure that roof curb is structurally built to support the weight of the SKG3 humidifier.
Roof curb must provide proper level to the humidifier.
The base of the weather proof enclosure is provided with 4 holes Ø1/2’’ (12mm) to
bolt the SKG3 humidifier to the roof curb.
20'’ (510)
minimum
24'’ (600)
minimum
30'’ (800)
minimum
24'’ (600)
minimum
24'’(60)
minimum
24'’(60)
minimum
30'’(80)
minimum
20'’(51)
minimum
4 holes ؽ'’ (12)
to bolt humidifier
to roof curb.
5/8'’(16)
4'’(102)
24'’
(610)
12'’
(305)
1/2xU
U
U-8'’(204)

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
13
Stage 2 – Steam Distribution Installation
Fundamental
Design Concepts
1. Maximum steam velocity in a pipe must not exceed 40 ft/s (12m/s). Velocities
above this will generate noise.
2. Minimum steam pipe gradient must be 7˚i.e. 5’’ (125mm) rise in 40’’ (1m) run.
3. The lowest point of any steam hose or rigid pipe must be the humidifier.
Otherwise, a steam trap (S trap) must be installed at the lowest point of the
steam line. This steam trap must be installed higher than the static pressure of
the system by at least 2’’ (50mm).
4. Total length of the flexible steam hose must not exceed 16 feet (5 m) or
insulated rigid piping must not exceed 50 feet (15 m).
5. Whenever possible, use rigid copper piping. Flexible steam hoses can be used
for short runs or for interconnecting between rigid pipe runs. Ensure that there is
no kink in the flexible hose.
When using a rigid copper pipe, insulation must be used to diminish
condensation build up.
Min. 7°
Correct Installation
Single module
humidifier with
Multisteam.
Static pressure
+ 2'’ (50)
Steam distribution correct installation 1- Fig. 15a
(dimensions in bracket are in mm)
Min. 7°
Correct Installation
Single module humidifier with 2 S.A.M.E2 manifolds
Static pressure
+ 2'’ (50)
Steam distribution correct installation 2 - Fig. 15b
(dimensions in bracket are in mm)
Incorrect installation - Fig. 16
6. Connection pipe sizes between SKG3 and steam distributor in the duct must be:
3’’ (76mm) up to 264lb/h (120kg/h)
4 ¼’’ (108mm) up to 528lb/h (240kg/h)
5 ¼’’ (133mm) up to 560lb/h (255kg/h)
7. All humidifiers below 220lb/h (100kg/h) capacity must use standard Neptronic®
S.A.M.E2 steam distribution pipes. Multi-Steam can be offered if shorter
absorption distances are required.
8. All humidifiers above 220lb/h (100kg/h) capacity must use the Multi-Steam.
9. All humidifiers above 528lb/h (240kg/h) must use 2 Multi-Steam units per air
handling unit (AHU) or air duct, with an equal duty split to each Multi-Steam.
!

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
14
Stage 2 –Steam Distribution Installation
Steam Outlet
Configuration for
Weather Proof
Enclosure
Weather proof enclosure single steam outlet - Fig. 17
The SKG3 humidifier with weather proof enclosure is provided with an integrated
steam manifold with an outlet located on either one of the sides of the humidifier.
By default, the steam outlet will be on the right side of the humidifier (when facing the
control panel). Steam outlet side can be switched to left upon request to factory.
Weather Proof
Enclosure Steam
Outlet Dimension
& Quantity
Model
Steam outlet
Qty
Steam outlet
diameter
SKG3
110-1, 155-1, 180-1, 210-1
1
Ø3”
(76mm)
SKG3
265-2, 310-2, 350-2, 405-2
1
Ø4”
(100mm)
SKG3
505-3, 560-3, 610-3
1
Ø5”
(125mm)
SKG3
710-4, 765-4, 810-4
2
Ø4”
(100mm)
Integrated steam manifold
Steam outlet

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
15
Stage 2 –Steam Distribution Installation
Selection of
Steam
Distribution
Manifolds
1. The minimum steam manifold length that can be used with the SKG3-110-1 to
SKG3-210-1 is 35’’ (900mm). Any manifold below this dimension will have
insufficient outlet spigots to allow proper steam distribution.
2. If duct size is below a width of 35’’ (900mm) width, it will be necessary to either fit
multiple pipes or use a Multi-Steam system.
Horizontal duct –2 manifolds - Fig. 18
(dimensions in bracket are in mm)
Horizontal duct –3 manifolds - Fig. 19
(dimensions in bracket are in mm)
Vertical duct –2 manifolds - Fig. 20
(dimensions in bracket are in mm)
Vertical duct –3 manifolds - Fig. 21
(dimensions in bracket are in mm)
H
2/5 H
5'’ (120)
5'’(120)
Ø 3'’ (78)
1/5 H
8'’ (200)
air flow
Air duct
H1/3 H
5'’(120)
Ø3'’ (78)
1/6 H
10'’ (250)
air flow
Air duct
10'’ (250)
1/2 H
5'’ (120)
H
min. 24'’ (600)
1/2 H 1/4 H1/4 H
Min. 4'’(100)
Air duct
H
min. 36'’ (900)
1/3 H 1/3 H
1/6 H 1/6 H
Min. 4'’(100)
Air duct

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
16
Stage 2 –Steam Distribution Installation
Steam Pipe Work to Duct Connections (SKG3-110 to 210)
SKG3-110
Steam distribution manifolds
(S.A.M.E2)
minimum lenght = 35'’ (900)
Ø3'’ (76)
ؽ'’ (15)
Min. 7° pipe slope
Min. 4'’ (100)
Insulated pipe
H
Air Duct
Static pressure +
2'’ (50)
Min. 2/5 H
Steam pipe work SKG3-110, SAM - Fig. 22
(dimensions in bracket are in mm)
A single Ø3’’ (76mm) feed pipe must be connected to two (2) S.A.M.E2 steam manifolds
with a suitable reduction at the lowest point to allow a ؽ’’ (15mm) condensate drain from
the main steam supply.
SKG3
155, 180, 210
Min. 7° pipe slope
Ø3'’ (76)
ؽ'’ (15) Steam distribution manifolds
(S.A.M.E2)
minimum lenght = 35'’ (900)
Min. 4'’ (100)
Insulated pipe
H
Air Duct
Static pressure +
2'’ (50)
Min. 1/3 H
Steam pipe work SKG3-155 to 210, SAM - Fig. 23
(dimensions in bracket are in mm)
A single Ø3’’ (76mm) feed pipe must be connected to 3 S.A.M.E2 steam manifolds with a
suitable reduction at the lowest point to allow a ؽ’’ (15mm) condensate drain from the
main steam supply.

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
17
Stage 2 –Steam Distribution Installation
Selection of
Multi-Steam
1. For all Multi-Steam units, use the Neptronic® Humidisoft program to size the
unit.
2. Where two Multi-Steam units are required with duties in excess of 528lb/h
(240kg/h), make your selection using the following rules:
Divide the air volume flow in half.
Divide the AHU / air duct width in half.
Height of the duct must remain at 100% its height.
This will size the Multi-Steam units so that they can be placed side by
side.
3. For installation of Multi-Steam units please refer to Neptronic® Multi-Steam
Installation Instructions
Multi-Steam in Horizontal duct - Fig. 24
(dimensions in bracket are in mm)
Multi-Steam in Vertical duct - Fig. 25
(dimensions in bracket are in mm)
ؽ'’ (15) Static pressure
+ 2'’ (50)
Min. 50 mm
Min. 2'’ (50)
Min. 2'’ (50)
Mounting bracket must be level horizontally
Steam supply hose or
rigid pipe to Humidifier
Header must be pitched toward condensate drain
Condensate drain pipe to steam trap
Air duct
Rod, bolt, nut and
washer assembly
Static pressure
+ 2'’ (50)
Min. 10º
Steam supply hose or
rigid pipe to Humidifier
Header must be pitched toward condensate drain
Air duct Rod, bolt, nut and
washer assembly
Air flow
Air flow

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
18
Stage 2 –Steam Distribution Installation
Steam Pipe Work to Duct Connections (SKG3-110 to 810)
SKG3-110 to 265
Steam pipe work 1 module, Multi-Steam - Fig. 26
(dimensions in bracket are in mm)
A single Ø3’’ (76mm) feed pipe must be connected to a single Multi-Steam with a
suitable reduction at the lowest point to allow a ؽ’’ (15mm) condensate drain from
the main steam supply.
SKG3-265 to 405
Steam pipe work 2 modules, Multi-Steam - Fig. 27
(dimensions in bracket are in mm)
Two Ø3’’ (76mm) steam outlets to a single Ø4 ¼’’ (108mm) feed pipe must be
connected to a single Multi-Steam with a suitable reduction at the lowest point to
allow a ؽ’’ (15mm) condensate drain from the main steam supply.
Ø3'’ (76)
ؽ'’ (15)
Insulated pipe Air duct
Static pressure
+ 2'’ (50)
Multisteam
Min. 7° pipe slop
Total length of steam conduit should
not exceed 17' (5m)
min7°pipeslope
Ø3'’ (76) Ø3'’ (76)
Ø4 ¼'’ (108)
Ø2'’ (15)
Min. 7° pipe slope
Static pressure
+ 2'’ (50)
Insulated pipe
Air Duct

SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
19
Stage 2 –Steam Distribution Installation
SKG3-505 to 610
Steam pipe work 3 modules - Fig. 28
(dimensions in bracket are in mm)
Three Ø3’’ (76mm) steam outlets to a single Ø5 ¼’’ (133mm) feed pipe must be
connected to a double Multi-Steam with a suitable reduction at the lowest point to
allow a ؽ’’ (15mm) condensate drain from the main steam supply.
If these Ø ½’’ (15mm) condensate pipes are connected, the common condensate
drain must be ؾ’’ (22mm).
SKG3-710 to 810
Steam pipe work 4 modules, Multi-Steam - Fig. 29
(dimensions in bracket are in mm)
Two Ø3’’ (76mm) steam outlets to a single Ø4 ¼’’ (108mm) feed pipe must be
connected to a single Multi-Steam with a suitable reduction at the lowest point to
allow a Ø ½’’ (15mm) condensate drain from the main steam supply.
This must be reproduced two times.
If the two ؽ’’ (15mm) condensate pipes are connected, the common condensate
drain must be ؾ’’ (22mm).
ؾ'’ (22)
Ø3'’ (76) (x3)
Ø5 ¼'’ (133)
Min. 7° pipe slope
Insulated pipe
Air Duct
ؽ'’ (15) Static pressure
+ 2'’ (50)
min7°pipeslope
min7°pipeslope
ؽ'’ (15)
Static pressure
+ 2'’ (50)
ؾ'’ (22)
Min. 7° pipe slope
Insulated pipe
Air Duct
Ø3'’ (76)
(x2)
Ø4 ½'’
(108) x2