Installation manual

installation manual TWIN 80 EN
17
2.5. ELECTRICAL
2.5.1. Supply connection
If a stationary appliance is not provided with a supply cord
and a plug or with other means for disconnection from the
supply having a contact separation of at least 3 mm in all poles,
the instructions shall state that such means for disconnection
must be incorporated in the fixed wiring.
If a stationary appliance is provided with a supply cord and a
plug in the instructions shall state that the appliance must be
positioned so that the plug is accessible
There must be an electrical outlet with Earth connection
available at a maximum distance of 1 m from the unit.
The electricity connection (230 VAC) must consist of Line,
Neutral and Earth and a good Earth connection (requirement for
good ionisation operation of the appliance).
If the supply cord is damaged, it must be replaced by the
manufacturer or is service agent or similarly qualified person in
order to avoid a hazard.
If the display of the unit gives the status code ‘U’, this
means the Line and Neutral connections are reversed.
2.5.2. Supply fuse
If Master fuse fails the Slave
printed circuit board cannot get
commands from the Master to
take over processing.
If Slave fuse fails the Master
printed circuit board wil operate
normally and can heat the
system with one single unit.
2.5.3. Input
Temperature sensors: 5Vdc ± 5%, R
25
= 12kΩ, ß = 3980
Water pressure sensor: 12Vdc ± 20%, Ri = 100kOhm
0÷10V : Ri = 20kOhm
Room thermostat: 24Vac (standard)
Room thermostat: 230Vac (option)
OpenTherm: available on main board
1kHz, Manchester encoding conform specification 2.0
RS-485 : cascade input, SIT protocol
Ionisation: detection 100Vac
2.5.4. Output
Glow plug: single switched 230Vac
Gas valve: double switched 230Vac
Fan : 325Vdc
Pump: unit system pumps (2-stage speed operated)
In operation/lock-out LED: 10mA dc
External lock-out contact: potential free contact
External system pump 230VAC max. 275W (1,2 Amp)
External 3-way valve and HWS cilinder
2.5.5. Cascade connection of master and slave
Bus protocol: RS-485 (TIA/EIA-485-A)
Polarity: phase depending
Wiring: 2 wires (A and B),
Twisted pair, no shield
Shut-off resistance: not needed
Galvanic isolation: not needed
Communication: 9600 Baud
Master and Slave: Connected to the same PE-Line
F1
Supply Fuse
3.15 AT
cascade
connection
between
the red
terminals