Vaillant flexoTHERM exclusive VWF 57/4 230V, Инструкция по установке и обслуживанию

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0020213395_04 Installation and maintenance instructions
49
Code Meaning Cause
Remedy
F.737 Condensation temperature too
high
–
Temperature in the building circuit
(heating mode) or environment cir-
cuit (cooling mode) too high for com-
pressor operation
–
Refrigerant volume too high
–
Check the EEV (does the EEV
move to the limit stop? Use the
sensor/actuator test)
–
Check the compressor inlet sensor,
high-pressure sensor and low-pres-
sure sensor
–
Check the refrigerant volume (see
Technical data)
F.740 Environment circuit: Inlet temp.
too low
–
Inlet temperature in the environment
circuit too low for the compressor to
start for heating:
–
Air/brine: Environment circuit inlet
temperature < -28 °C
–
Ground/brine: Environment circuit
inlet temperature < -7 °C
–
Ground water/brine: Ground water
inlet temperature < 2 °C
–
Check the dimensioning of the envir-
onment circuit
–
Check the sensors
F.741 Building circuit: Return temp.too
low
–
Return temperature in the building
circuit too low for the compressor to
start
Heating:
–
Return temperature < 5 °C
Cooling:
–
Return temperature < 10 °C
–
Heating: Check that the 4-port valve
functions correctly
F.742 Environment circuit: Inlet temp.
too high
–
Inlet temperature in the environment
circuit too high for the compressor to
start
–
Brine inlet temperature > 50 °C
–
Feed-in of external heat into the en-
vironment circuit
–
Heating: Check that the 4-port valve
functions correctly
–
Check the environment circuit
–
Check the sensors
–
Reduce or stop the external heat
that is entering
F.743 Building circuit: Return temp. too
high
–
Return temperature in the building
circuit too high for the compressor to
start
Heating:
–
Return temperature > 55 °C to 60 °C
(depending on the brine inlet temper-
ature)
Cooling:
–
Return temperature > 35 °C
–
Cooling: Check that the 4-port valve
functions correctly
–
Check the sensors
F.783 Connection error: Terminal block
(TMB) Cable not connected or connected incor-
rectly Check the connection cable between the
power supply PCB and the control PCB
F.784 Connection error: ICL Cable not connected or connected incor-
rectly Check the connection cable between
the power supply PCB and the in-rush
current limiter PCB
F.787 Environment circuit: Pressure
mon. open
–
Pressure loss in the environment
circuit due to leakages or air pockets
–
Environment circuit pressure switch
defective
–
Cable not connected either between
X110B and X110 or X110 and
X110A for the power supply PCB. No
230 V voltage is present at X131.
This is interpreted as an input
contact being open.
–
Bridge at X131 (as supplied). Larger
voltage fluctuations in the power
supply can lead to a fault message.
–
T4 fuse defective
–
Check the environment circuit for
leaks
–
Top up the medium (brine-to-water),
purge
–
Check the screwed contact on the
PCB
–
Check that the pressure switch
works correctly
–
Replace the pressure switch
–
Check that the wiring of X110B with
X110 or X110A with X110 is correct
–
Eliminate any voltage fluctuations in
the network, e.g. via the site power
supply
–
Check the T4 fuse and replace if
necessary