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Allow sufcient cable length to ensure the connections are not strained when the cover is opened.
Once cables have been routed through the cable glands, close the access cover.
Connect power cable and controller cable as shown in gure 10. Do not strip the cables before pulling
them through the glands in the access panel. Where stranded cable is being used, a ferrule must be tted
before inserting into the push connections.
The controller (Modbus) cable is then connected from the heat pump to the wiring centre (see wiring
diagrams in Appendices).
4.2.7 Modbus Cable Information
Table 2: Recommended cable specications/electrical characteristics for Modbus cable
4.2.8 Opening and Installing the User Interface
It is recommended to connect the Modbus cable in daisy-chain series (as shown in gure 13) from the
heat pump on to the wiring centre and then on to the UI. The jumpers will be in the correct factory setting
for this wiring conguration by default. If using the recommended conguration, the jumper position does
not need to be changed.
Figure 13: Recommended MODBUS cable conguration
If it is deemed necessary to install the Modbus cable in a different order, please see Appendices.
The cover of the UI must be removed in order to move the jumper. To remove the cover, unscrew the
screw at the bottom of the UI and lift the cover and rotary dial.
Belden Cable 9842 Typical Equivalent Cable
Nominal Characteristic Impedance 120Ω 120Ω
Nominal Conductor DC Resistance
24.0Ω/1000ft
78.7401 Ω/km*
78.80 Ω/km*
Nominal Capacitance Core to Core
12.8pF/ft
41.99pF/m
42pF/m
*Conversion factor for ft to m = 3.28 ft = 1m
1km of Belden cable would have a resistance of 78.74 Ω/km
1km of Equivalent cable has a resistance of 78.8 Ω/km
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