Neptronic SHS20 User manual

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 1
Model
SHS20
Description
The SHS20 is a wall mounted high limit humidistat capable of
monitoring and controlling relative humidity for applications
using a room distribution system. Its primary function is to act as
an On/Off high limit protection for humidifiers equipped with a
space distribution unit (SDU).
Features
On/Off high limit humidistat with on-board setpoint
adjustment (20 to 90%RH)
Built-in humidity sensor
Plastic cover for wall mount installation
24Vac or 24Vdc
1 dry contact output (normally open)
SHS20
Technical Specifications
Specifications
SHS20
Power supply
24 Vac or Vdc ±10%
Power consumption
1 VA
Electrical connection
0.8 mm2 [18 AWG] minimum
Humidity sensor precision
±3% at 40 %RH and 23ºC [73ºF]
High limit setpoint range
20 to 90 %RH
Operating temperature
32ºF to 104ºF [0ºC to 40ºC]
Storage temperature
14ºF to 122ºF [-10ºC to +50ºC]
Relative humidity
0 to 95 %RH
Enclosure protection
IP 30 (EN 60529)
Weight
0.13 lb [60 g]
Dimensions
A = 2.85” (73mm)
B = 4.85” (123mm)
C = 1.00” (24mm)
D = 2.36” (60mm)
E = 3.27” (83mm)
A
B
C
D
E

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 2
Mounting Instructions
CAUTION: Remove power to avoid a risk of malfunction.
A. Remove the captive screw that’s holding the base and the front cover of the unit together.
B. Lift the front cover of the unit to separate it from the base.
C. Pull all wires through the holes in the base.
D. Secure the base to the wall using wall anchors and screws (supplied). Make the appropriate connections.
E. Mount the front cover on the base and secure using the screw.
A EDCB
PCB Overview
1 2 3 4 5 6
Terminal Strip (TB1)
TB1
Setpoint
Dial
1 = Common
2 = 24 Vac or Vdc
3
4
5 = High Limit Terminal 5
6 = High Limit Terminal 6
}Not Available
Jumper (JP1)
JP1
1
2
3
1
2
3
1
2
3
= Wet Contact (for SKE4)
= Dry Contact
(for SK300/SKE and SKR)

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 3
Wiring Diagrams
SKE4 Humidifier
Modulating SKE4 Humidifier
Field Wiring with HRO20
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
Airflow Switch
High Limit Humidistat
Interlock
On/Off Demand Contact
Control Demand (0-10Vdc)
Room Humidity (0-10Vdc)
Duct Humidity (0-10Vdc)
Steam Output (0-10Vdc)
Common
24 Vac
24 Vac
SHS20*
SKE4 PCB
Control Connections
1
2
3
4
5
6
TB3 TB4
1
2
12
13
14
15
16
24 VAC
MOD
%RH
COM
HRO20
*Ensure that JP1 is set to terminals 1&2: 1
2
3
JP1
Field Wiring with SHR10
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
Airflow Switch
High Limit Humidistat
Interlock
On/Off Demand Contact
Control Demand (0-10Vdc)
Room Humidity (0-10Vdc)
Duct Humidity (0-10Vdc)
Steam Output (0-10Vdc)
Common
24 Vac
24 Vac
SHS20*
SKE4 PCB
Control Connections
1
2
3
4
5
6
TB3 TB4
Common
24 Vac
0-10 Vdc Output
1
2
3
SHR10
*Ensure that JP1 is set to terminals 1&2: 1
2
3
JP1

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 4
On/Off SKE4 Humidifier
Field Wiring with HRC20
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
Airflow Switch
High Limit Humidistat
Interlock
On/Off Demand Contact
Control Demand (0-10Vdc)
Room Humidity (0-10Vdc)
Duct Humidity (0-10Vdc)
Steam Output (0-10Vdc)
Common
24 Vac
24 Vac
SHS20*
SKE4 PCB
Control Connections
1
2
3
4
5
6
TB3 TB4
*Ensure that JP1 is
set to terminals 1&2: 1
2
3
JP1
Common
24 Vac
Contact Terminal 5
Contact Terminal 6
HRC20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 1&2: 1
2
3
JP1

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 5
SK300/SKE Humidifier
Modulating SK300/SKE Humidifier
Field Wiring with HRO20
1
2
12
13
14
15
16
24 VAC
MOD
%RH
COM
HRO20
1
875
432F
6 9
SK300/SKE Humidifier
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
SHS20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
JP1
1
2
3
Normally
Open
Contact
Field Wiring with SHR10
1
875
432F
6 9
SK300/SKE Humidifier
SHR10
Common
24 Vac
0-10 Vdc Output
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
SHS20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
JP1
1
2
3
Normally
Open
Contact

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 6
On/Off SK300/SKE Humidifier
Field Wiring with HRC20
SK300/SKE Humidifier
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
SHS20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
JP1
1
2
3
F 1 2 3 7 8 9
Normally
Open
Contact
Common
24 Vac
Contact Terminal 5
Contact Terminal 6
HRC20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
JP1
1
2
3
Normally
Open
Contact

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 7
SKR Humidifier
Modulating SKR Humidifier - Kit N (North America)
Field Wiring with HRO20
Modulating SKR-N Printed Circuit Board
Dip switches
TB5
External cut-off
24 Vdc
TB6
ON
1 2 3 4
Control demand from
humidistat 0-10 Vdc
-
+
24 Vdc
Common
24 Vdc
High Limit Terminal 5
High Limit Terminal 6
SHS20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
JP1
1
2
3
1
2
12
13
14
15
16
24 VDC
MOD
%RH
COM
Setpoint
HRO20
TB4
24 Vdc
Normally
Open
Contact
Modulating SKR Humidifier - Kit N (Europe)
Field Wiring with HRO20
Modulating SKR-CE-N Printed Circuit Board
TB5
24 Vdc
ON
1 2 3 4
-
+
Transformer
External
Transformer
(by others)
TB6
1
2
12
13
14
15
16
24 VAC
MOD
%RH
COM
Setpoint
HRO20
Dip switches
External cut-off
Control demand from
humidistat 0-10 Vdc
TB4
24 Vdc
Common
24 Vac
High Limit Terminal 5
High Limit Terminal 6
SHS20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
JP1
1
2
3

Room High Limit Humidistat
Specification and Installation Instructions
SHS20-180524-ESA www.neptronic.com Page | 8
Notes
Recycling at end of life: please return this product to your Neptronic local distributor for recycling. If you need to find the nearest
Neptronic authorized distributor, please consult www.neptronic.com.
400 Lebeau blvd, Montreal, Qc, H4N 1R6, Canada
www.neptronic.com
Toll free in North America: 1-800-361-2308
Tel.: [phone]
Fax: [phone]
Customer service fax: [phone]
Monday to Friday: 8:00am to 5:00pm (Eastern time)