Neptronic SKE Manual

SKE-ENG-110221.doc
Steam Humidifier
SKE series
HUMIDITY
45% RH
Installation instruction
& user manual
READ AND SAVE THESE INSTRUCTIONS

SKE-ENG-110221.doc
Foreword
1. These installation instructions and operation manual have been developed to facilitate the installation
and the operation of the SKE series steam humidifier.
The strict application of these instructions will ensure the conformity of your installation and operation as per
manufacturer's recommendations.
2. The application of these instructions is one of the conditions for the application of the warranty.
3. 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.
4. 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.
5. 2011: All right reserved, this document cannot be reproduced totally or partially by any mean whether,
electronic, mechanical, photocopy, recording or other, without prior written authorization of National
Environmental Products Ltd.
Manufacturer Presentation
National Environmental Products Ltd. (NEP) is the owner of the brand Neptronic.
NEP develops, manufactures and services a complete line of:
Steam humidifiers,
Humidistat among the most precise and the most reliable on the market.
Actuators to regulate air damper or valves
Electric heaters
Thermostats and other control peripherals used to control HVAC equipment.
For more information about our products, visit our web site at www.neptronic.com
Each Neptronicproduct benefits from over 25 years of experience of our qualified staff.
From the inspiration to realization, innovation has been the standard in design. As the result of this dedication,
NEP Ltd. owns several patents, notably the ENERDRIVE system and the AFEC system.
Manufacturing is conducted on the premises of our modern 7 000m2facility in Montreal, Canada.
Our quality system is built on the ISO 9001 model.
Our vision '' Customer for Life'' is realized by listening their needs and by supplying them with products, which
exceed their expectations in quality, functionality and durability.
National Environmental Products Ltd.
Tel. (Toll free): 1 800 361-2308
Tel.: (1) [phone]
Fax: (1) [phone]
Fax Customer service: [phone]
Business hours: from Monday to Friday, 8:00am to 5:00pm (Eastern time)

ii
Table of content
Foreword & Manufacturer presentation ……………………………………………………………………………..i
1. Presentation..................................................................................................................................................... 2
1.1. Overview..................................................................................................................................................... 2
1.2. Definition..................................................................................................................................................... 3
2. Characteristics ................................................................................................................................................ 4
3. Mechanical installation................................................................................................................................... 5
3.1. General recommendations ......................................................................................................................... 5
3.2. Positioning .................................................................................................................................................. 5
3.3. Wall mounting............................................................................................................................................. 5
4. Steam dispersion system selection and positioning.................................................................................. 6
4.1. Steam dispersion system selection ............................................................................................................ 6
4.2. Positionning of S.A.M or S.A.M.E2............................................................................................................. 8
5. Steam output connection............................................................................................................................. 11
5.1. Typical installation .................................................................................................................................... 11
5.2. General recommendations ....................................................................................................................... 11
5.3. Installation of “S” traps on the steam line................................................................................................. 11
5.4. Position of steam output........................................................................................................................... 12
5.5. Installation of humidifier with Space Distribution Unit (SDU).................................................................... 13
6. Plumbing connection.................................................................................................................................... 14
6.1. Water supply............................................................................................................................................. 14
6.2. Drain connection....................................................................................................................................... 15
7. Power supply connections........................................................................................................................... 15
8. Low voltage control connections................................................................................................................ 16
8.1. ''ON/OFF'' Humidifier ................................................................................................................................ 16
8.2. Modulating Humidifier............................................................................................................................... 16
8.3. Common Alarm Connections.................................................................................................................... 20
8.4. Controls Placement (steam dispersed into a duct or AHU)...................................................................... 20
9. Front panel display features ........................................................................................................................ 21
9.1. Description display modes........................................................................................................................ 22
9.2. Programming ............................................................................................................................................ 24
10. Control p.c. board................................................................................................................................... 25
10.1. Main p.c. board......................................................................................................................................... 25
10.2. Modulating p.c. board............................................................................................................................... 25
11. Start up procedure.................................................................................................................................. 26
12. Service..................................................................................................................................................... 27
12.1. General..................................................................................................................................................... 27
12.2. Evaporation chamber cleaning................................................................................................................. 27
13. Exploded view & Bill of Material............................................................................................................ 30
13.1. Exploded view........................................................................................................................................... 30
13.2. Bill of Material ........................................................................................................................................... 31
14. Trouble shouting guide.......................................................................................................................... 33
General condition of sale & warranty ……………………………..………………………………………………..37

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1. Presentation
Thank you for you confidence to Neptronicproduct. You have purchased the best and the most robust humidifier
for its category.
1.1. Overview
1.1.1. List of accessories supplied
2 sets of keys.
2 adjustable collars for the connection of the steam hose for each steam output.
1 female cmpression fitting ¾ hydraulic for the drain output of the evaporation chamber.
1 female compression fitting ½ hydraulic for the drain output of the drip pan.
1 female fitting for the water supply connection.
1 Installation instruction and operation manual.
1.1.2. Overview of the Humidifier
Access door to
mechanical
compartment
Heater element
connector
Heater element
Level sensor
chamber
Water supply valve
Electrical
compartment
Evaporation
chamber
Control panel
SKE
neptronic
Evaporation
chamber
drain pump
(Illus. 1)

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1.1.3. Options avalaible
The following options are available when purchasing a SKE humidifier:
Modulating control humidifier – suffix M (i.e. SKE20M)
Humidifier for system supplied with Deionised water or Reverse Osmosis water,
dissolved solids more than 1 ppm (SF DI-APPLICATION)
Humidifier for system supplied with Deionised water or Reverse Osmosis water,
dissolved solids more than 0.028 ppm (SF ULTRAPURE-DI)
Space Distribution Unit mounted on humidifier (SDU) or remote installation (SDU-REM)
Network communication system, BACnet – suffix B (i.e. SKE20M-400-3B)
Stainless steel humidifier cabinet – suffix P (i.e. SKE20M-400-3P)
Dry contact to activate an external fan relay on a call for humidity (SF SK300FANRELAY)
1.2. Definition
1.2.1. Evaporation chamber
Assembly including the metal cylinder and a cover equipped with one or several heater elements.
It is the heart of the humidifier, which produce steam.
1.2.2. SDU (Space Distribution Unit)
Integrated steam distribution unit, optional on certain humidifiers.
1.2.3. Multi-Steam system
Custom made system of steam distribution. This system is designed to allow very short
absorption distances (less than 900mm).
1.2.4. S.A.M. (Steam Absorption Manifold)
Steam manifold adapted to air duct size to allow steam absorption in relatively short distance
(less than 1500mm).
1.2.5. S.A.M.E2 (Steam Absorption Manifold with 2 Eyelets)
Steam manifold with two eyelets adapted to application with restricted air duct dimensions to
allow steam absorption in relatively short distance (less than 1500mm).

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2. Characteristics
B
AE
D
Steam Humidifier
SKE
SDU
Space Distribution
Unit (option)
C
(Illus. 2)
Steam Consumption Output Dimension of the cabinet (mm)
Current (A)
Model Capacity
(Kg/Hr) Power (KW) 230V
1 phase 400 V 3 Phases Qty Diam
(mm) Size A B C D E
Option
SDU
SKE05 5 3,7 16 5,5 1 35
Small 597 470 292 140 737 SDU-1
SKE10 10 7,5 33 11 1 35
Medium 724 533 318 165 890 SDU-2
SKE20 20 15 - 22 1 35
Medium 724 533 318 165 890 SDU-2
SKE30 30 22 - 33 2 35
Medium 724 533 318 324 1048 SDU-3
SKE40 40 30 - 44 2 35
Medium 724 533 318 324 1048 SDU-3
SKE50 50 36 - 53 2 54
Large 794 813 318 - - -
SKE60 60 44 - 64 2 54
Large 794 813 318 - - -
SKE80 80 60 - 87 3 54
Large 794 813 318 - - -
Options:
On modulating humidifier, the maximum steam output can be programmed with the function ''LOCK ON''
in Program mode.
WARNING (MODULATING HUMIDIFIER): THE MAXIMUM POWER OF THE ELECTRICAL
INSTALLATION SHOULD BE IN ACCORDANCE WITH THE ABOVE TABLE, DO NOT TAKE ACCOUNT
A POSSIBLE REDUCTION OF STEAM OUTPUT, DUE TO MODULATION.

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3. Mechanical installation
3.1. General recommendations
CAUTION: RISK OF ELECTRIC SHOCK. DISCONNECT THE APPLIANCE FROM THE ELECTRIC
SUPPLY BEFORE TO PROCEED TO INSTALLATION.
Location: Plan a location easy to access in order to permit an easy inspection and servicing of the
humidifier.
Do not install humidifier where failure of the appliance could cause damage to the building structure or to
costly equipment.
This location should be well ventilated; the ambient temperature should not exceed 30°C.
The maximum distance between the humidifier and the ventilation duct should not exceed 5 meter
(maximum length of the steam hose).
(0,60 m)
(0,25 m) (1 to 1,2 m)
10'’
24'’
39 to 48'’
E
neptroni c
Positioning (Illus. 3)
3.2. Positioning
The front panel and the right side (electrical compartment)
should be accessible in order to permit the servicing.
Leave a clearance of at least 1,25m to the front panel and
0,6m to the right side.
The humidifier should be mounted at a minimum of 1m to
1,2m above floor level.
Leave a clearance of at least 0,25m under the humidifier for
installation of water supply, drain piping and electrical
connections.
3.3. Wall mounting
Use the keyholes located on the back panel of the humidifier.
Before to proceed to the wall mounting, take off the
Evaporation chamber sub assembly (see section 12,
Servicing).
Check the solidity of the chosen support or wall (bricks,
concrete, stud partition wall, etc) on which the humidifier will
be mounted.
Drill holes for the upper anchors (holes with eyelet) into the
support or wall as per dimensions specified in the table
(illus.4).
The holes dimensions (diameter and depth) should by in
accordance with the recommendations of the chosen anchors.
Install then bolt anchors, if required.
Screw-on the 2 or 3 upper screws (holes with eyelet) of a
minimum diameter of #10 (6mm) (screws are not supplied).
Leave a clearance between head screws and wall in order to
permit the mounting of the humidifier.
Use the keyholes located on the back panel of the humidifier.
Hang on the humidifier to the 2 or 3 screws; it is preferable let
the front door open during this operation.
According to the size and weight of the humidifier, you may
need the help of a second person to assist you.
When the humidifier is positioned on the upper screws, tighten
the screws to secure the humidifier.
If applicable, install and secure lower screws.
Front view (Illus. 4)
Dimensions mm
Model A B C D E F G
SKE05 - 202 165 516 - - -
SKE10, SKE20,
SKE30, SKE40 - 254 203 625 276 203 254
SKE50, SKE60,
SKE80 102 305 265 698 276 576 -

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4. Steam dispersion system selection and positioning
4.1. Steam dispersion system selection
In order to prevent the accumulation of condensation in air ducts, NEP has designed 4 basic
configurations of steam distribution to provide the client with the most economical solution for any
particular application.
4.1.1. S.A.M. (steam absorption manifold) Horizontal duct
air
(Illus. 5)
The SAM is to be installed
where absorption distances
are short, less than 1500mm,
and/or low duct temperatures
are in effect.
4.1.2. S.A.M.E2 (steam absorption manifold) Horizontal duct
900
air
(Illus. 6)
The SAME2 is to be installed
where absorption distances are
short, less than 1500mm and/or
low duct temperatures are in
effect. SAME2 are used in
applications with restricted duct
dimensions.

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4.1.3. S.A.M. or S.A.M.E2 (steam absorption manifold) Vertical duct
S.A.M.
S.A.M.E2.
45°
45° 45°
air
air
(Illus. 7)
SAM or SAME2 for vertical ducts
are used where the absorption
distances are normal and the
client requires an economical as
well as an efficient solution.
4.1.4. Multi-Steam system
air
(Illus.8)
The Multi-Steam system is to be
installed in critical locations in air
handling systems, particularly
where absorption distances are
very short, less than 900mm, or
low air duct temperatures are in
effect.
The Multi-Steam is custom made
to the dimensions of duct or AHU.
Instructions to install Multi-Steam
system are described in a specific
installation instructions manual
enclosed with the Multi-Steam
system.

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4.2. Positionning of S.A.M or S.A.M.E2
4.2.1. Duct mounting
Steam manifold should be mounted and
secured through the side of the air
handling unit or duct. Provision should be
made for safe accessibility, ideally with an
observation light and window.
Check that the construction of the duct
wall is suitable enough to support the
steam pipe for the duration of the
installation life.
Dimension of hole size in the duct must
be as per table below:
Steam manifold Ø Hole size ØA
35mm 51mm
51mm 78mm
5'’
(120mm)
5'’
(120mm)
ØA
(Illus. 9)
WARNING: Risk of condensing. Ensure
that the minimum distance of the end of
the manifold is at least 102mm from the
top of the duct.
4'’ minimum
(102mm)
Minimum distance (Illus. 10)
4.2.2. Recommendations for SAM distribution pipes
Maximum
Capacity Outlet Distribution pipes
Diameter Minimum
length Maximum length
Maximum
static
pressure
Model kg/hr Qty mm mm mm (Pa)
SKE05 5 300 600
SKE10 10
SKE20 20
1
SKE30 30
600 1200
SKE40 40
35
SKE50 50
SKE60 60
2
SKE80 80 3
51 750 1500
1245
Note: For higher static pressure, please contact the manufacturer.

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4.2.3. Placement of steam pipe in horizontal duct
35mm diameter pipe
H
10'’ minimum
(250mm)
1/3 H
air
1 pipe (Illus. 11)
air
H
10'’ minimum
(250mm) 3'’ minimum
(80mm)
8'’
(200mm)
6'’ minimum
(150mm)
2 pipes (Illus. 12)
51mm diameter pipe
H
24'’ minimum
(600mm)
1/5 H
2/5 H
8'’
(200mm)
air
2 pipes (Illus. 13)
H
36'’ minimum
(900mm)
1/6 H
1/2 H 1/3 H
10'’
(250mm) 10'’
(250mm)
air
3 pipes (Illus. 14)
Note: 51mm steam pipe must be supported on the end by appropriate duct hanger or
strap (supplied by others).

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4.2.4. Placement of steam pipe in vertical duct
Eyelet orientation
air
3D view (Illus. 15)
air
45°
air
45°
S.A.M S.A.M.E2
(Illus. 16)
35mm diameter pipe
W
10’’ minimum
(250mm)
1/2 W
1 pipe (Illus. 17)
W
24’’ minimum
(600mm)
1/2 W 1/4 W1/4 W
2 pipes (Illus. 18)
51mm diameter pipe
W
24’’ minimum
(600mm)
1/2 W 1/4 W1/4 W
2 pipes (Illus. 19)
W
36’’ minimum
(900mm)
1/3 W 1/3 W
1/6 W 1/6 W
3 pipes (Illus. 20)

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5. Steam output connection
5.1. Typical installation
15 %
2
7
2
4
4
3
3
5
1
1
1
6
Humidifier
(Illus. 21)
5.2. General recommendations
Please follow these general rules of installation in order to avoid any static pressure inside distribution
pipes and into the humidifier evaporation chamber, and also to avoid any condensation accumulation.
a) The slope of the steam hose (rigid or flexible)
should not be less than 15% (7 horizontal length for
1 vertical length) in order to ensure continuous
drainage of condensation back to humidifier or to
steam trap.
b) Total length of the steam hose or rigid pipe should
not exceed 5 meters. Longer runs will result in added
condensation losses. Whenever possible, use
insulated copper piping. Flexible steam hose should
be used for short runs (up to 5m) or for
interconnecting between the rigid pipe runs.
c) Whenever using rigid copper, these ones should
be insulated to diminish condensation build up. Incorrect installation
(Illus. 22)
5.3. Installation of “S” traps on the steam line
The lowest point of any steam hose or rigid pipe must be the humidifier. If necessary a steam
separator (S trap) should be installed higher than the static pressure of the system by at least 51mm.
8"
15% 15%
Use "S" separator
when ceiling space is
limited and you need
to create 15% slopes
Steam outlet
(Illus. 23)
Use ‘’S’’ separator when
the steam distributor is
lower than the humidifier
steam outlet
8'’
(203mm)
15%
(Illus. 24)
1 Clamps
2 Flexible hose
3 Rigid copper pipe
4 Insulation
5 Steam distribution manifold
6 Duct
7 Long radius copper pipe

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5.4. Position of steam output
Model Dimensions mm
Small
Cabinet IJ
SKE05 110 122
Medium
Cabinet KLM
SKE10
SKE20 - 102 143
SKE30
SKE40 134 102 143
Large
Cabinet NOPQ
SKE50
SKE60
SKE80 179 179 132 144
I
J
L
M
Small Cabinet
(SKE05)
Medium Cabinet
(SKE10-20)
Medium Cabinet
(SKE30-40)
L
MK
Large Cabinet
(SKE50-60)
Large Cabinet
(SKE80)
P
QON
P
QON
(Illus. 25)

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5.5. Installation of humidifier with Space Distribution Unit (SDU)
18'’
(0,45 m)
78'’
(2 m)
Without
additional
ventilation
54'’ (1,35 m)
E
neptronic
SDU mounted on humidifier (Illus. 26)
The SDU should be installed in an
environment where the air is relatively
clean. This will avoid the blower from
getting clough with dust.
The humidifier should be mounted such
that the SDU fan section is at least 2m
above the floor.
A minimum clearance of 0.45m from the
ceiling should be allocated to avoid
ceiling and wall condensation.
If additional ventilation is not present,
the fan should have a clearance from
the ceiling of at least 1.35m. Proper
ventilation must be observed to avoid
ceiling and wall condensation.
SDU remote installation:
The SDU can be in a different location
from the humidifier (remote SDU).
Please follow the piping
recommendations (section 5.2).
Mount the SDU to the wall on brackets
(not supplied), do not drill mounting
holes thru the cabinet of the SDU.
Connect the steam hose(s) to the
bottom inlet(s) of the SDU to the top of
the steam outlet(s) of the humidifier.
Secure the hose(s) with the supplied
hose clamp.
Connect the condensate hose to the
bottom of the SDU to an open drain.
Connect the electrical wires from the
SDU to the top of the humidifier. Field
wiring must conform to local codes.
The fan of the SDU will operate for a period
of four minutes after steam production has
stopped to prevent condensation.
Avoid any obstruction of the ventilation
openings on top of the SDU.
Maintenance of the SDU:
Clean the blower if there is an
accumulation of dust.
18'’
(0,45 m)
78'’
(2 m)
Field piping
(not supplied)
Without
additional
ventilation
54'’ (1,35 m)
4'’
(0.10m)
Field wiring
(by others)
2nd pipe
for SDU2 or SDU3 E
neptronic
SDU remote installation (Illus. 27)

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6. Plumbing connection
The operation of SKE series humidifier is independent of variable water conditions, with soft or hard water.
Therefore, for normal operation, no pre-treatment of water is necessary.
A
B
C
DE
Bottom view (Illus. 28)
Dimensions (mm)
Model A B C D E
SKE05 165 51 232 105 44
SKE10
SKE20
SKE30
SKE40
184 44 248 105 44
SKE50
SKE60
SKE80 179 44 248 105 44
Minimum
500mm Minimum
200mm
Minimumbuildingsidedrainof42mmØ
SKE Humidifier
22mm Ø
15mm Ø
(Illus. 29)
6.1. Water supply
Water inlet specifications:
Inlet water pressure: 0,7 to 4,8 bars (10 to 70 psig)
Maximum temperature: 30°C maximum
3/8'' standard copper water line connection
A shut off valve (not supplied) should be installed in the water supply line to the unit, close to the
humidifier to facilitate servicing.
It is recommended to install a standard water strainer in the water supply line.
Please follow the steps described below:
Connect 3/8'' copper pipe to the bottom 3/8''
compression fitting (supplied).
Finger tighten the swivel top 3/8'' fitting to the
male threaded part of the valve.
CAUTION: RISK OF DAMAGE TO THE
VALVE. DO NOT USE WRENCH TO TIGHEN
SWIVEL.
Base plate of
humidifier
Male threaded part of
the valve
Swivel top
Compression
fitting
Fitting
supplied
Water line
3/8'' hydraulic pipe
Fill valve
(Intern)
(Illus. 30)

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6.2. Drain connection
Drain connection specification:
Evaporation chamber water drain temperature: 60°C.
Standard hydraulic compression fittings: a ¾” (20mm) (evaporation chamber drain) and a ½” (15mm)
(Pan drain).
2 hydraulic threaded fitting located under the humidifier (see Illus. 29) must be connected to the drain
pipe.
Use standard copper hydraulic pipes ¾” (20mm) and ½” (15mm).
Ensure that the drain pipe dimension is sufficient, especially if more than one humidifier is evacuating into
the same drain line.
7. Power supply connections
CAUTION: RISK OF ELECTRIC CHOC. DISCONNECT THE HUMIDIFIER FROM THE ELECTRIC
SUPPLY BEFORE TO PROCEED TO THE CONNECTION.
WARNING: RISK OF FIRE. Do not interchange the power terminal block designated L1, L2 and L3 with
Low voltage terminal block designated 1, 2 and 3.
The wiring to the Humidifier should be done by a qualified electrician, and conforming to the procedure,
regulation and local codes.
Use only coppers conductors.
An external over current protection and disconnect circuit breaker should be installed on the supply
adjacent to the humidifier.
A knock out (not supply) should be installed at the bottom of the electrical compartment of the humidifier
for strain relief of the supply cable.
Ensure that the size of the wire conductors is appropriate for the current supplied.
Ensure that each terminal connection is properly secured.
The ground conductor should be equipped with ring terminal and should be connected directly to the
electrical panel on the indicated location.
1 Phase Connection
L1 L2
PHASE 2
PHASE 1
GND
(Illus. 31
3 Phases Connection
L1 L2 L3
PHASE 2 PHASE 3
PHASE 1
GND
(Illus. 32)

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8. Low voltage control connections
8.1. ''ON/OFF'' Humidifier
5 Vdc
Low voltage control
terminal block
High voltage power
terminal block
Humidistat
High
limit
Pressure
Differential
switch
5 Vdc
12
2
1
789
(Illus. 33)
8.2. Modulating Humidifier
8.2.1. Connection to the Humidifier control terminal block
Connection to HRO20 humidistat or HRO20 with remote humidity sensor (SHR10 or SHC80).
humidistat
24 VAC
Pressure Differential
switch
High limit
1 432F
8756 9
Control terminal
block wiring
HRO20
16
14 15 1312
MOD
Set point
%RH
COM
SKE
humidistat
High limit
1 432F
8756 9
Control terminal
block wiring
HRO20
SKE
24 VAC
16
14 15
1312
MOD
%RH
COM
Pressure Differential
switch
+SHR10
or
SHC80
24 VAC
3
%RH
COM
%RH input
(Illus. 34)

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8.2.2. Humidity control by humidifier (internal mode)
Humidity controlled by humidifier, using SHR10 or SHC80 as space sensor.
1
875
432F
69
1
3
2
COMMON
0-10 VDC OUTPUT
24 VAC OR VDC
SHR10
or
SHC80
SKE
To Term. #3
To Term. #F
To Term. #6
(Illus. 35)
VAV system with humidity controlled by humidifier, using SHC80 as Hi limit duct sensor and
SHR10 or SHC80 as space sensor.
1
875
432F
69
SKE
To Term. #3
To Term. #F
To Term. #4
1
3
2
COMMON
0-10 VDC OUTPUT
24 VAC OR VDC
SHC80
1
3
2
COMMON
0-10 VDC OUTPUT
24 VAC OR VDC
SHR10
or
SHC80
To Term. #F
To Term. #3
To Term. #6
Note: when SHC80 is used as Hi limit
Duct sensor, control signal jumper
should be placed on 0-10 Vdc on
Modulating PCB (see section 8.2.4 of
installation instructions)
(Illus. 36)

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8.2.3. Humidity Signals (internal mode)
Terminal Block Modulating Printed Circuit Board
Humidity signal 0-10 Vdc
1
875
432F
69 0-10 Vcc
+
-
Pressure Differential
Switch
High limit
Humidistat
5 Vdc
(Illus. 37)
PCB970819 REV. C
Jumper on
0-10V
Extra jumper
TOP PCB
MODULATING
CONTROL
INPUT
HUMIDITY
INPUT
4-20mA
0-10V
2-10V
4-20mA
0-10V
2-10V
(Illus. 40)
Humidity signal 2-10 Vdc
1
875
432F
69 2-10 Vcc
+
-
Pressure Differential
Switch
High limit
Humidistat
5 Vdc
(Illus. 38)
PCB970819 REV. C
Jumper on
2-10V
Extra jumper
TOP PCB
MODULATING
CONTROL
INPUT
HUMIDITY
INPUT
4-20mA
0-10V
2-10V
4-20mA
0-10V
2-10V
(Illus. 41)
Humidity signal 4-20 mA
1
875
432F
69 4-20 mA
+
-
Pressure Differential
Switch
High limit
Humidistat
5 Vdc
(Illus. 39)
Jumpers on
4-20mA & 2-10V
PCB970819 REV. C
TOP PCB
MODULATING
CONTROL
INPUT
HUMIDITY
INPUT
4-20mA
0-10V
2-10V
4-20mA
0-10V
2-10V
(Illus. 42)