Viessmann VITOTRONIC 200 Service Instructions Manual page 124

Diagnosis
System
(cont.)
A
Ext. HS switching
12.02.2018
Start hysteresis reached
SC:HC SM:PM2
Back with
G F
Fig. 21
Component whose status has changed.
A
Set status
B
Preset condition or limit for the status change with
C
unit
Date and time of the status change
D
Event (reason for the status change)
E
State machine "SM": Control circuit that has trig-
F
gered the status change.
"SC": Hydraulic circuit to which the status change
G
relates.
Component and set status
A
Component
A
"Compressor 1"
"Compressor 2"
"Primary source 1"
"Secondary pump 1"
"Electric heater"
"LPG solenoid valve 1"
"Cylinder reheating"
"Ext. HS switching"
"Active cooling"
124
B
ON
19:58:24
5K
ä
E D C
B
Meaning
Compressor or compressor 1 with 2-stage
refrigerant circuit
Compressor 2 with 2-stage refrigerant cir-
cuit
: Primary pump
/ : Fan or inverter frequency
Secondary pump
Instantaneous heating water heater
Shut-off valve in the refrigerant circuit
Circulation pump for cylinder reheating or
immersion heater
Switch on external heat generator
Active cooling function
Set status
B
With output con- Without output
trol control
"0 %" to "100 %"
—
"OFF", "St1",
―
"St2", "St3" to
indicate the se-
lected stage
"ON" or "OFF"
—