Viessmann VITOTRONIC 200 Service Instructions Manual page 138

Diagnosis
Refrigerant circuit
A B
Refrigerant circuit
116.5°
33.6bara
35.5°
W 100%
100%
V
tc:33.0°
U
26.1°
Back with
T
Fig. 27 2-stage refrigerant circuit in heating mode,
heat generation at the condenser: Only 1
compressor is displayed with a single stage
refrigerant circuit.
Pos. Refrigerant circuit in heating mode
Secondary circuit flow temperature in °C
A
Hot gas temperature in °C
B
Hot gas pressure in bar(a)
C
Value underlined:
Hot gas control active [2]
Compressor speed in rpm or in %
D
Compressor
Animated symbol: Compressor is running.
■
When the refrigerant circuit is reversed the symbol appears turned by 180°.
■
Only 1 symbol is displayed with a single stage refrigerant circuit.
■
With a 2-stage refrigerant circuit, compressor 1 is at the top and compressor 2 at the bot-
■
tom.
Suction gas temperature in °C
E
Suction gas pressure in bar(a)
F
Value underlined:
Pressure control for suction gas active, max.
operating pressure (MOP) of evaporator ex-
ceeded ([2]) or min. operating pressure of
evaporator undershot (LOP, [2])
Refrigerant
G
Evaporator air intake temperature in °C
H
Primary pump
Animated symbol: Primary pump is running.
Fan
Animated symbol: Fan is running.
Speed of fan or primary pump in %
I
138
(cont.)
C D E F
-11.5°
4.6bara
117/s
5.0K
5.5K
51.0° 100% 21.0°
S N M L
G
R410A
H
6.0°
65%
I
tO: -4.0°
J
tO:-4.0°
10.0°
K
Refrigerant circuit reversal
Suction gas temperature in °C
Suction gas pressure in bar(a)
Value underlined:
Pressure control for suction gas active, max.
operating pressure (MOP) of evaporator ex-
ceeded ([2]) or min. operating pressure of
evaporator undershot (LOP, [2])
Hot gas temperature in °C
Condensing pressure in bar(a)
Value underlined:
Hot gas control active [2]