Casella CEL Indoor air quality monitor - Manual (Page 25)

10. EXTERNAL CONNECTIONS
10.1 Alarm Connector
This connector allows access to the contacts of the alarm relay contained within
the MICROTHERM control unit.
The connector is wired thus:
Common
contact
Normally
closed contact
Normally
open contact
Set 1 Pin 2 Pin 6 Pin 1
Set 2 Pin 4 Pin 5 Pin 3
The contacts are rated at 1 A resistive at 24 V and are voltage free.
External Connections
Page 25 of 42
MICROTHERM indoor air quality &
WinIaq Application Software - User Manual