Viessmann VITODENS 200-W Service Instructions Manual page 59

General/Group 1
Coding in the delivered condition
3F:0 Internal circulation pump
stays in control mode at
signal "External
demand"
51:0 Internal circulation pump
always starts when there
is a heat demand
52:0 Without flow temperature
sensor for low loss
header
53:1 Function connection sK
of the internal extension:
DHW circulation pump
(cont.)
Possible change
3F:1
3F:2
51:1
51:2
52:1
53:0
53:2
53:3
Internal circulation pump
stops at signal "External
demand"
Internal circulation pump
starts at signal "External
demand"
System with low loss
header:
When there is a heat
demand, the internal circu-
lation pump only starts
when the burner is opera-
tional (with pump run-on)
System with heating water
buffer cylinder:
When there is a heat
demand, the internal circu-
lation pump only starts
when the burner is opera-
tional (with pump run-on)
With flow temperature sen-
sor for low loss header
(automatic recognition)
Function connection sK:
Central fault
Function connection sK:
External heating circuit
pump (heating circuit 1)
Function connection sK:
External circulation pump
for cylinder heating
Code 2
59