Table of Contents
Advertisement
7.10 CAN-BUS TERMINATION
Term
Fig. 2 CAN-BUS termination
[1]
Terminated CAN-BUS
[2]
Non-terminated CAN-BUS
Switch Term marks the start and end of the CAN-BUS connection. The
display card (labelled with LCD on the wiring diagram) and the PEL card
in the heat pump must be terminated by switch Term (position ON).
If the CAN-BUS connected room controller is used it is terminated, and
Term on the PEL card in the heat pump must be set to not terminated
(position OFF).
When using the Multi Module (which is an accessory), the accessories
board in this module must be terminated, and Term on the PEL card in
the heat pump must be set to not terminated (position OFF).
We recommend that all printed circuit boards that are to be connected
to the CAN-BUS are installed first. When this is being done, switch Term
must be in the Term position. (ON position).
7.10.1 SETTING OF SWITCH TERM
When switch Term is in position ON, the loop is terminated. In position
ON, Term is placed at the middle position and covers the hole in the
board.
When switch Term is in position OFF, the loop is not terminated. In
position OFF, Term is placed at one of the side positions and the hole in
the board is not covered.
7.11 HANDLING CIRCUIT BOARDS
Circuit boards with control electronics are sensitive to discharges of
static electricity (ESD – ElectroStatic Discharge) when handled. To
prevent damaging the components, special care is therefore required
when handled.
CAUTION: Always wear a a ground-connected bracelet
when handling electronics.
Fig. 3 Bracelet
Damage is usually undetected, and a circuit board can operate correctly
during commissioning but show signs of problems later. Charged
objects may only be problematic if they are in close proximity to the
electronics. Keep a distance of at least one metre from expanded
polystyrene, protective plastic and other packaging, synthetic material
(e.g. fleeces) and similar before starting work.
6 720 806 768 (2013/02)
1
2
No Term
6 720 644 816-03.1I
6 720 614 366-24.1I
A method for good ESD protection is a ground-connected bracelet when
handling electronics. This bracelet must be put on before opening the
screened metal bag/packaging or before exposing an installed board.
The bracelet must be worn until the circuit board is enclosed in its screen
packaging or closed electric box. Replaced, returned circuit boards must
be handled in the same way.
Fig. 4
8
HEATING, GENERAL
The heating system consists of one or more circuits. The heating system
is installed according to operating mode, depending on access to and
type. Settings for this are made by the installer
8.1
CIRCUITS FOR HEATING
• Circuit 1; the first circuit is included by default in the control unit and
is controlled by the installed flow sensor, possibly in combination with
an installed room controller.
• Circuit 2 (mixed); control of circuit 2 is also included by default in the
control unit and only needs to be supplemented with a mixing valve,
circulation pump and flow sensor and possibly with an additional
room controller.
• Circuits 3-4 (mixed); control of up to 2 additional circuits is optional.
Each circuit is then fitted with a Multi module, mixing valve, circulation
pump, flow sensor and possibly a room controller.
Circuits 2 through 4 cannot have a higher flow
temperature than circuit 1. This means that underfloor
heating on circuit 1 cannot be combined with radiators
on another circuit. Room temperature reduction for
circuit 1 can affect other circuits in some cases.
8.2
CONTROL METHODS FOR HEATING
• Outdoor sensor; a sensor is fitted on the north facing outside wall of
the house. The sensor sends signals to the control unit in the heat
pump. Control with an outdoor sensor means that the heat pump
automatically regulates the heating in the house depending on the
outdoor temperature. The customer determines the temperature of
the heating system in relation to the outdoor temperature by setting
the current room temperature in the control unit.
• Outdoor sensor and room controllers (one room controller per
circuit is possible); Control with outdoor sensor supplemented with
room controller(s) means that one (or several) controllers are
mounted in a central location inside the house. They are connected to
HEATING, GENERAL
6 720 614 366-25.1I
7
Advertisement
Table of Contents
