7.6
Connecting the options
1. Connect the options according to the configuration of the installation
to the X12 or X19 connector on the EHC–04 PCB in the indoor mod
ule.
Tab.30 Connecting the options to X12
X12 connector
Description
R-Bus terminals
Connection of the TXM connected thermostat,
an on/off thermostat (ON/OFF) or a modulat
ing thermostat (OT)
BL1 IN and BL2 IN Connecting the multifunction inputs
SO+/SO- input
Connection of an energy meter
Condensation ter
minals
Connection of a condensation sensor for un
derfloor cooling.
Tab.31 Connecting the options to X19
Connector
Description
X19
Silent Mode option
7.6.1
Connecting an on/off or modulating thermostat
The on/off or modulating thermostat is connected to the R-Bus terminals
on the EHC–04 PCB or the optional SCB-04 PCB.
The PCBs are delivered with a bridge on the R-Bus terminals.
The R-Bus input can be configured to add the flexibility of using several
types of on/off thermostat or OT.
Tab.32 Control parameter for the OT input on the R-Bus terminals
Parameter
Description
CP640
Configuration of the contact direction of the OT input for heating mode.
CP690
Reversal of the direction of the logic in cooling mode compared to heating mode
Tab.33 Default settings for the CP640 and CP690 parameters
Value of the CP640 parame
ter
Value of the CP690 parame
ter
Heating if the OT contact is
Cooling if the OT contact is
1 (Default value)
0 (Default value)
closed
closed
0
0
open
open
1
1
closed
open
0
1
open
closed
7.6.2
Connecting a thermostat with heating/cooling connector
The AC thermostat is connected to the R-Bus and BL1 terminals of the
EHC–04 PCB only, with a single heating circuit.
The PCBs are delivered with a bridge on the OT input.
Tab.34
Value of the CP640
parameter
Value of the AP098
parameter
The BL1 blocking
input is
Operating mode for
the heat pump
If the OT contact is
open
If the OT contact is
closed
1 (Default value)
1 (Default value)
Open
Cooling
No cooling demand Cooling demand
Fig.69
MW-1001169-01
R-Bus
BL1 IN
BL2 IN
So+ So-
Condensation
X15
X26
X2
X25
X13 X6
X21
X28
X24
X12
X9
X4
X5
X19
X17
X16
X10
X23
X30
X18
X1
X20
EHC-04
X7
X8
X27
X22
}
7 Installation
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