Neptronic HRC20 User manual

Room Humidistat
Specification and Installation Instructions
HRC20-180522-ESA www.neptronic.com Page | 1
Model
HRC20
Description
The HRC20 is a wall mounted humidistat capable of monitoring
and controlling relative humidity for applications using a room
distribution system. Its primary function is to act as a room
sensor for On/Off humidifiers.
Features
On-board setpoint adjustment (10 to 60%RH)
Built-in humidity sensor
Plastic cover for wall mount installation
24Vac or 24Vdc
1 dry contact output (normally open)
HRC20
Technical Specifications
Specifications
HRC20
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]
Setpoint range
10 to 60 %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 Humidistat
Specification and Installation Instructions
HRC20-180522-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
Jumper (JP1)
1 2 3 4 5 6
Terminal Strip (TB1)
TB1
JP1
Setpoint
Dial
1 = Common
2 = 24 Vac or Vdc
3
4
5 = Contact Terminal 5
6 = Contact Terminal 6
}Not Available
1
2
3
1
2
3
1
2
3
= Wet Contact (for SKE4)
= Dry Contact
(for SK300/SKE and SKR)

Room Humidistat
Specification and Installation Instructions
HRC20-180522-ESA www.neptronic.com Page | 3
Wiring Diagrams
On/Off SKE4 Humidifier
Standard Field Wiring
Common
24 Vac
Contact Terminal 5
Contact 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
HRC20*
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
On/Off SK300/SKE Humidifier
Standard Field Wiring
F 1 2 3 7 8 9
SK300/SKE Humidifier
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
Airflow
Switch
High Limit
Humidistat

Room Humidistat
Specification and Installation Instructions
HRC20-180522-ESA www.neptronic.com Page | 4
On/Off SKR Humidifier - Kit N (North America)
Standard Field Wiring
SKR-N Printed Circuit Board
Dip switches
TB5
ON
1 2 3
Common
24 Vdc
Contact Terminal 5
Contact Terminal 6
HRC20*
1
2
3
4
5
6
*Ensure that JP1 is
set to terminals 2&3:
Normally
Open
Contact
JP1
1
2
3
TB6
-
24 Vdc
On/Off SKR Humidifier - Kit N (Europe)
Standard Field Wiring
SKR-CE-N Printed Circuit Board
TB5
Transformer
External
Transformer
(by others)
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:
Normally
Open
Contact
JP1
1
2
3
Dip switches
ON
1 2 3