Checking Actuator And Sensors - Viessmann VITOTRONIC300 Installation And Service Instructions Manual

Commissioning
Matching the Coding Addresses to the System Version
Matching coding addresses according to the burner used
Address Meaning
03:... Fuel
08:... Units and tens of the maximum
burner output
09:... Hundreds of the maximum burner
output
15:... Modulation range runtime
0A:... Ratio of output base load to
maximum burner output in percent
05:...
Ratio of partial output at b of the
servomotor runtime to maximum
burner output in percent
Checking Actuators and Sensors
The following actuators (relay outputs) can be controlled subject to the system equipment level:
Display
"All actuators" OFF
"Base load" ON
"Burner" ON
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Setting
Gas operation: 0 (factory set condition)
Oil operation: 1 (irreversible)
Example: Max. burner output:
225 kW – select: 25
Note: Values up to and including 199 kW can be entered directly.
Example: Max. burner output: 225 kW – select: 2
Calculate runtime (s) of servomotor between base load and max.
burner output
Example: Base load output: 72 kW
Max. burner output: 225 kW
(72 kW: 225 kW) · 100% = 32%
Example: Partial output 171 kW
Max. burner output: 225 kW
(171 kW : 225 kW) · 100% = 76%
Explanation
All actuators have been switched off.
Mod. burner operates at min. output.
Burner stages 1 is switched on.
Vitotronic 300, GW2B Installation and Service
Matching the control unit to a modulating burner
Note: The burner must be fully adjusted. To achieve
a wide modulating range, set the minimum output
as low as possible (take the chimney and flue
system into account).
Testing relays
1. Press OK and simultaneously for approx. 4 sec.
2. "Actuator test"
(continued)