Adjusting The Heating Curves (Only For Weather-Compensated Control Units) - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
Function/system components
Operation with LPG
System only with two heating circuits with mixer with
extension kit for mixer (without unregulated heating
circuit) with DHW heating
Heating circuit pump A1 connection at extension
AM1, terminal A1
DHW circulation pump connection at extension AM1,
terminal A2
System with low loss header
Adjusting the heating curves (only for weather-compensated
control units)
The heating curves illustrate the relation-
ship between the outside temperature
and the boiler water or flow tempera-
ture.
To put it simply: The lower the outside
temperature, the higher the boiler water
or flow temperature.
The room temperature, again, depends
on the boiler water or the flow tempera-
ture.
Note
If the heating system includes heating
circuits with mixers, then the flow tem-
perature of the heating circuit without
mixer is higher by a selected differential
(8 K in the delivered condition) than the
flow temperature of the heating circuits
with mixers.
The differential temperature can be
changed at coding address 9F.
56
(cont.)
Adjust Delivered con-
Slope setting ranges:
■ Underfloor heating systems: 0.2 to 0.8
■ Low temperature heating systems: 0.8
to 1.6
Settings in the delivered condition:
■ Slope = 1.4
■ Level = 0
Code
dition
82:1 82:0
00:8 00:10
—
33:1
—
34:0
04:0 04:1