Fire Detection Thermostat Installation Guide

Текст документа

Fire detection thermostat

Options and Accessories, Installation manual
Ref.: N-40331_EN 0909
                                                                                                                                           Index

Index

1       Fire detection thermostat........................................................................................................ 1

1.1     General Information............................................................................................................... 2
1.2     Technical specifications......................................................................................................... 2
1.3     General measurements.......................................................................................................... 2
1.4     Assembly................................................................................................................................ 3
1.5     Operations.............................................................................................................................. 4
1.6     Installation.............................................................................................................................. 4

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Fire detection thermostat
1          Fire detection thermostat
1.1        General Information

1.1 General Information
When the hot supply air reaches the set temperature, the thermostat disconnects and the control detects
the fault, indicating as such on the YKN2Open board and on thermostat DPC-1 and closing the accessory
board relay contact.

1.2 Technical specifications
This accessory includes the following components:
• Limiting thermostat (A25CN).
• Temperature/Smoke control board.
• Telephone connection cable (300 mm).
• Ties for cable securing.

1.3 General measurements
Thermostat (mm)

      A.       Reset lever.
      B.       1/4-20UNC assembly bolt.
      C.       Flange.
      D.       22.3 mm hole ‑ PG16.
      E.       Dial button.

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                                                                          Fire detection thermostat      1
                                                                                          Assembly     1.4

Accessory board

 A. Green LED.

1.4 Assembly
The temperature limiting thermostat is fitted on the inside of the Rooftop, on the supply air side, using
the metal flange supplied and attached to the separator panel with two screws.
The temperature/smoke control board is fitted to the inside of the electrical box in the holes provided for
this accessory on the side of the boards.
Close-up of assembly, thermostat side.

   A.    Evaporator coil.
   B.    Fire detection thermostat.
   C.    Outside coil.
   D.    Access to the compressor
   E.    Return air.
   F.    Supply air.
   G.    Condensation air.
   H.    Outdoor air (economiser).

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1        Fire detection thermostat
1.5      Operations

Accessory circuit board

    1.   Temperature/Smoke control board.

1.5 Operations
Under normal operations, 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 the high temperature incident with a 4-5 flashing sequence 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.
If the economiser accessory is fitted, check the position of bridge J20 on the economiser board. Bridge
J20 (outside damper closed with high temperature-smoke alarm) is open by default. If the bridge is
closed, outside damper open with high temperature-smoke alarm is selected.
In units equipped with a supply sensor connected to the YKN2Open board with hot water coil (accessory)
or economiser, where a supply temperature of over 80 °C is detected the unit will stop and fault code 45
displayed.

1.6 Installation

      NOTE
Bear in mind the current regulations on electrical installation in the country where the unit is to be installed.

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                                                                       Fire detection thermostat       1
                                                                                      Installation   1.6

 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 no. 692, terminal 1 (COM)
  and 693, terminal 2, (NC) (The wires are located
  in the economiser cable on the air filter access
  side).
4 Set the thermostat to 100 ºC.
5 Fit the temperature/smoke control board in the electrical box.

          NOTE
   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 Search for brown wires no. 692 and 693 inside the duct and connect them to connector J4 on 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. Then search for and configure 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 switched off, check that the green
  LED (V1) on board A9 is flashing to indicate that the accessory has been configured.
9 To check correct electrical operations, make a bridge between terminals 1 and 2 of the thermostat
  and check that the YKN2Open board (A1) indicates the high temperature fault with a 4-5 flashing
  sequence of the red LED . Reconnect the wires and reset the YKN2Open board (A1) to delete the
  fault.

      CAUTION
Loose connection terminals produce overheating of cables and terminals. The unit is working incorrectly
and there is a risk of fire.

Data and measurements subject to changes without prior notice.

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