Duomo CHCO Instrukcja obsługi - Strona 5

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Duomo CHCO Instrukcja obsługi
6.

Typical Wiring Schematic

Natural Gas
Alarm Relay
CHCO
Terminal Block
Fused and Isolated
Electrical Supply
230V 50/60Hz.
5A Max.
Ph
N

7. Operation.

This device requires a permanent electrical supply. DO NOT USE A PLUG IN LEAD.
Initial Power up
The green 'On' light (6) will flash for approximately 90 Seconds. This is the warm up period. During this time
the detector will not sense Gas or Carbon Monoxide.
The green 'On' light (6) will stop flashing and will remain continuously lit.
To test the detector operation without applying calibrated test gas press the Test Button (2) inside the en-
closure. This test should only be conducted by a competent person. This test is used to establish the correct
operation of connected devices and does not replace the requirement to Test using Calibrated test gas at
least once a year.
Testing with calibrated test gas
Expose the Natural Gas sensor (3) to the a 20% LEL Test Gas. This Gas can be purchased from Duomo.
Expose the Carbon Monoxide sensor to Carbon Monoxide test gas from 30 to 300ppm. Please note the
alarm test times for lower concentrations is extended to meet EN50291. See table 1 of this document.
Once the CHCO sounds the alarm the relevant Alarm light will be lit for whichever gas is detected. Internal
switches or relays may be used for triggering a shut-off valve on the incoming mains gas pipe and to apply
power to a remote alarm beacon or a ventilation fan, or both. Check correct functionality of all connected
devices.
Remove the test gas, the detected level of gas will drop and the CHCO will auto-reset. That is to say the
alarm relays will return to the no gas position. Note: Although the power supply is reinstated to the Gas
valve, due to the type of valve to be used with this detector (Manual Reset Only). see e) of Emergency Actions
other considerations Page
1
2
3
4
5
6
Carbon Monoxide
Alarm Relay
7
8
The combined load of all external components
connected to the device must not exceed 4A. For larger
loads auxiliary contactors must be used. Call Duomo
Technical Department for further information.
Key
Additional
Audible Alarm
(If Fitted)
Manaul Reset Gas
Shut o Valve
Ventilation Fan
(IF Fitted)
Important Note: