1.5 Operation
In normal operation contact 1 (COM) of the thermostat is on standby and 2 (NC) is closed. When a
temperature higher than the set value (100 °C) is detected the contact opens.
The temperature/smoke control board detects the open contact at the inlet of terminals J4, triggering
output relay K1 through terminals J5 (contact not live).
The YKN2Open board (A1) indicates high temperature faults with a 4-5 flashing sequences of the red
LED. If thermostat DPC-1 is fitted, the incident is indicated on the screen where the time is displayed
along with fault code 45.
Once the cause of the increase in temperature has disappeared, the thermostat must be manually reset
and the YKN2Open board (A1) reset to delete the incident.
Where the economiser accessory is fitted, check the position of jumper J20 on the economiser board.
Jumper J20 (outside damper closed with high temperature-smoke alarm) is open by default. If the jumper
is closed, outside damper open with high temperature-smoke alarm is selected.
In units equipped with a supply probe connected to the YKN2Open board, with hot water coil (accessory)
or economiser, if a supply temperature of over 80 °C is detected the equipment will stop and fault code
45 is displayed.
1.6 Installation
N O T E
Bear in mind the current regulations on electrical installation in the country where the unit is to be installed.
A. Manual thermostat A25CN-9001.
B. Accessories.
1. Disconnect the main switch on the unit.
2. Fit the thermostat using the metal flange supplied
and two screws to the separator panel plate on the
supply air side.
3. Connect brown wires, terminal 1 (COM), and
terminal 2, (NC).
4. Set the thermostat to 100 ºC.
5. Fit the temperature/smoke control board in the
electrical box.
N O T E
If the smoke detection accessory is also fitted, only one temperature/smoke control board is fitted
and the two normally closed contacts fitted in series in input J4.
6. Connect the brown wired to connector J4 of board A9. Connect the telephone cable to connector J2
or J8 on board A2.
7. Once all of the connections are made, reconnect the unit main switch.
8. Check that the green LED on board A9 remains lit. Next, search and configure the accessories by
pressing the test button on the YKN2Open board (A1) for more than three seconds, until the red
LED lights up. When the search and configuration process starts, the red LED on the board will light
up and will remain on until the operation is completed. Once it has switched off, check that the green
LED (V1) on board A9 is flashing to indicate that the accessory has been configured.
9. To check the electrical operation, disconnect the wires of terminals 1 and 2 of the thermostat and
check that the YKN2Open board (A1) indicates the high temperature fault with a 4-5 flashing
sequences of the red LED. Reconnect the wires and reset the YKN2Open (A1) board to delete the
fault.
A
B
A9
1
Fire detection thermostat
1.5
Operation
4
