Viessmann Vitocrossal 300 Service Instructions For Contractors page 94

Diagnosis and service scans
Checking outputs (actuator test)
The following relay outputs can be controlled subject to system design:
Display
Base load start
Full load start
Output Internal start
Htg circ pump HC2 start
Mixer HC2 open
Mixer HC2 close
Htg circ pump HC3 start
Mixer HC3 open
Mixer HC3 close
Outp. int. exten. H1 start
EA1 output 1 start
Solar circuit pump start
Solar circ pmp min start
Solar circ pmp max start
Sol. output sS start
SA 104 output 1 start
SA 104 output 2 start
SA 104 output 3 start
94
(cont.)
Explanation
Burner operates at minimum output; heating circuit pump
A1 is on
Burner operates at maximum output; heating circuit pump
A1 is on
Internal output sA (cylinder primary pump) enabled
Heating circuit pump output enabled (extension to heat-
ing circuit with mixer)
"Mixer open" output enabled (extension to heating circuit
with mixer)
"Mixer closed" output enabled (extension to heating cir-
cuit with mixer)
Heating circuit pump output enabled (extension to heat-
ing circuit with mixer)
"Mixer open" output enabled (extension to heating circuit
with mixer)
"Mixer closed" output enabled (extension to heating cir-
cuit with mixer)
Output at internal extension H1/H2 enabled
Contact P - S on plug aBJ for extension EA1 closed
Solar circuit pump sF output at solar control module SM1
enabled
Solar circuit pump output at solar control module SM1
switched to minimum speed
Solar circuit pump output at solar control module SM1
switched to maximum speed
Output sS at solar control module SM1 enabled
DHW circulation pump output sK
Output heating circuit pump A1 sÖ