Viessmann GC1 Technical Data Manual

6
5604 122 v1.0
Vitotronic 100, KW10B Technical Data
Connections
Terminal connections
- screw-type connection
- RAST-5 quick connects
- Low voltage sensor and communication screw type
connections
Function Connection Description
120VAC power connection 40 control power
Boiler pump 20 120VAC output for boiler pump
DHW pump 21 120VAC output for DHW pump
Burner connection 41 harness connection for burner
Second stage 191 second stage burner demand
Low water cut-off LWCO powers LWCO device
Outdoor temperature sensor 1 5K ohm sensor
Boiler temperature sensor 3 10K ohm sensor
DHW temperature sensor 5 10K ohm sensor
TT stage 1 call for heat first stage
TT stage 2 call for heat second stage
OpenTherm communication OT OT connection for OT enabled room thermostat/device
Fault output AL Compiled fault indication
0-10VDC input/ext demand A1 coded function either 0-10VDC or external demand
LON communications C1/C2 Daisy-chained LON connection when optional LON board installed

Viessmann GC1 Specifications

General

Brand	Viessmann
Model	GC1
Category	Control Unit
Language	English