Viessmann VITOTRONIC 200 Service Instructions Manual page 125

System
(cont.)
Component
A
"Heating circ pump HC1" Heating circuit pump heating circuit
"Heating circ pump HC2" Heating circuit pump heating circuit
"Heating circ pump HC3" Heating circuit pump heating circuit
"Sw. outp. DHW circ p."
"Central fault message"
"Natural cooling"
"Valve heating/DHW1"
"Cylinder primary pump" Cylinder loading pump
"Swimming pool valve"
"Lag heat pump 1"
"Lag heat pump 2"
"Lag heat pump 3"
"Lag heat pump 4"
"Refrig. circ reversal"
"Methods"
Note
■ Only one event is indicated for each status change.
■ If a status change depends on several interlinked
events, it is always the last event that is indicated.
Events E
Event
E
"Start hysteresis reached"
"Stop hysteresis reached"
"OM changeover acc. to time
program"
"OM changeover ext. hook-up" Change to the operating status via external devices, digital input, BMS, lead
"Set value jump"
"Set value reached"
"Hydr. circuit changeover"
"Start/stop optimisation ac-
tive"
"Power-OFF enabled"
Meaning
A1/HC1
M2/HC2
M3/HC3
DHW circulation pump
Central fault message
Natural cooling function
3-way diverter valve "Central heating/DHW
heating"
3-way diverter valve for "swimming pool
heating"
Lag heat pump 1
Lag heat pump 2
Lag heat pump 3
Lag heat pump 4
Defrosting by refrigerant circuit reversal
Several system components simultaneous-
ly
Causes
Set temperature exceeded or undershot by hysteresis.
Set temperature exceeded or undershot by hysteresis.
Change to the operating status according to the set time program
heat pump, etc.
Change to the secondary circuit set flow temperature, e.g. due to the following
conditions:
Operating status changed according to the set time program.
■
Changeover between central heating, DHW heating, central cooling or
■
swimming pool heating
Function "Demand externally" or "Block externally" is active.
■
Cylinder temperature or buffer temperature has reached the set or max. tem-
perature.
Changeover between central heating, DHW heating, central cooling or swim-
ming pool heating
Function "Start optimisation for DHW heating 6009" or "Stop optimisation
for DHW heating 600A" active
Power-OFF is active.
Set status
B
With output con- Without output
trol control
"ON" or "OFF"
—
"ON" or "OFF"
—
"ON" or "OFF"
—
"ON" or "OFF"
—
Diagnosis
125