Safety Contact Connections; Dry Contacts - Neptronic SKE4-E Series Installation Instructions And User Manual

Network Contacts

Safety Contact Connections

The Airflow switch contact must be wired between terminals TB3 1&2. If this contact opens,
operation of the SKE4 unit will stop. The unit will display the airflow switch as open, but will not
generate an alarm. If an airflow switch is not used, install a jumper between terminals TB3 1&2.
The High limit humidistat contact must be wired between terminals TB3 1&3. If this contact opens,
operation of the SKE4 unit will stop and an alarm message will be displayed. If a high limit humidistat
is not used, install a jumper between terminals TB3 1&3.
The Interlock must be wired between terminals TB3 1&4. If this contact opens, operation of the SKE4
unit will stop. The unit will display the Interlock as open, but will not generate an alarm. If Interlock is
not used, install a jumper between terminals TB3 1&4.

Dry Contacts

Two series of volt free contacts are provided:
1. Alarm Contacts
2. Service Contacts
These contacts are used to switch a low voltage, ideally 24V, with a switching current of no
more than 3 Amps.
Each series has one Normally Closed contact and one Normally Open contact.
It is recommended to use the Normally Closed contact, as this contact will open in the event
of a humidifier fault.
www.neptronic.com
Electrical Control
Connections
Safety Contacts
Power Output
Analog Inputs
Analog Output
Alarm Contacts
Service Contacts
Illustration 39 - Electrical Control Connections
SKE4-E Steam Humidifier
Installation Instructions and User Manual
RS 485
A+
(HRL24)
B-
RS 485
A+
(BACnet MS/TP
B-
or Modbus RTU)
24 Vac
Airflow switch
High limit humidistat
Interlock
On/Off demand contact
Common
24 Vac
Control Demand
Room Humidity
Duct Humidity
Steam Output
Common
Normally Open
Normally Closed
Common
Normally Open
Normally Closed
1
2
1
2
1
2
3
4
5
1
2
3
4
5
6
1
2
3
1
2
3
Page | - 37 -