Heat Pump - Viessmann PLC VITOCAL 350-HT PRO Service Instructions For Contractors

Operating conditions and actuator tests

Heat pump

Launch with
■ "Menu"
■ "Heat pump"
Fig. 25
Compressor 1, 2 and 3, see page 47.
White Switched OFF
Green Switched ON
Red Fault
"Low press." evaporation temperature, calculated
A
from pressure
Temperature, evaporator inlet
B
Temperature, evaporator outlet
C
Electronic expansion valve (EEV) with degree of
D
opening
3-way valve, compressor superheating, with
E
degree of opening
Room temperature
F
(cont.)
Casing temperature
G
"High press." condensing temperature, calculated
H
from pressure
Temperature, condenser inlet
J
Hot gas temperature
K
Temperature, condenser outlet
L
Oil pressure differential
M
Suction gas temperature downstream of IHE
N
Compressor superheating downstream of IHE
O
Internal heat exchanger (IHE)
P
Evaporator superheating
R
Suction gas temperature downstream of evapora-
S
tor
Diagnosis
39