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Installation and maintenance instructions 0020213395_04
8.3
Electronics box
1
8
7
3
6
4
5
2
9
1
VR 32 modulating bus
coupler (optional)*
* If the basic system
diagram selected on
the system control
makes provision for
this accessory, it can be
connected here.
2
Control PCB
3
VR 40 multi-func-
tional module (2 in 7)
(optional)**
** Relay 1 is used as
a fault contact connec-
tion/alarm output for the
heat pump. The function
of relay 2 can be set in
the system control.
4
Operating capacitor
5
Start capacitor
6
In-rush current limiter
PCB
7
Circuit breaker
8
Power supply PCB
9
Power supply terminal
for the electric back-up
heater
8.4
Establishing the power supply
1.
Route the power supply line(s) through the holes in the
back wall of the product.
2.
Guide the lines through the product, through the appro-
priate strain reliefs and to the terminals of the power
supply and control PCB.
3.
Wire the connections as illustrated in the connection
diagrams below.
Note
There is no provision for using a wiring dia-
gram on the control or on the heat pump
control panel.
4.
Tighten the strain reliefs.
8.4.1
Connecting the continuous power supply for
the compressor and control system
▶
Connect the continuous power supply to the mains con-
nection (X101). (
8.4.2
Connecting the blockable power supply for
the back-up heater
▶
Connect the power supply to the X102 power supply.
(
8.4.3
Connecting an external brine pressure
switch
In some cases (e.g. in potable water protection areas), local
authorities require the installation of an external brine pres-
sure switch that switches off the refrigerant circuit if the pres-
sure in the brine circuit falls below a certain level. If the cir-
cuit is switched off by the brine pressure switch, a fault mes-
sage is shown on the display.
▶
Pull out the X131 plug for the bypass line (source monit-
oring) on the power supply PCB.
▶
Connect an external brine pressure switch to the two
X131 terminals (Source Monitoring) on the power supply
PCB.
–
Rated voltage of external brine pressure switch:
230 V 50 Hz
–
Power range for external brine pressure switch (rms):
1 to 5 mA
8.4.4
Connecting a limit thermostat
In some cases where the underfloor heating has a direct
power supply, a limit thermostat (on-site) is essential.
▶
Pull out the S20 plug for the bypass line at terminal X100
on the control PCB.
▶
Connect the limit thermostat at this terminal.
8.4.5
Connecting an external well pump
2
1
N
La
Lb
A changeover contact connection X143
(1)
with the assign-
ment Lb, La, N, PE is provided for connecting a cut-off relay
for the external well pump.
Lb is the opening contact. If the cut-off relay contact to the
well pump is closed, there is no voltage at Lb.
La is the closing contact. If the cut-off relay contact to the
well pump is closed, there is no voltage at La.
Summary of Contents for flexoTHERM exclusive VWF 57/4 230V
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