Viessmann GC1 - Page 12

Vitotronic 100, GC1B / Vitotronic 300-K, MW1B Installation and Service
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Installation Examples
System Example 1 (continued)
Equipment required
Pos. Description
tP
KM BUS distributor, for several KM BUS subscibers
zP
Extension EA1
zQ
1 switching output (floating changeover contact):
- Switching a feed pump to a substation
- Signalling reduced mode for a heating circuit
zW
1 analogue input (0 – 10V):
- Specifying the set system supply temperature
zE
3 digital inputs:
- External heating program changeover, separately adjustable for heating circuits 1 to 3
- External demand
- External blocking with fault message
- Fault message input
- Short term operation of DHW recirculation pump
External hook-ups
zT
- External blocking/mixing valve closed
zZ
- External demand
zU
- External heating program changeover/mixing valve open
uP
LON communication module (standard delivery Vitotronic 300-K) for communication with the following
components:
Vitotronic boiler and heating circuit control units
Vitocom 100 LAN 1