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5. Positioning the CHCO

Ideally, a CHCO should be installed in every room containing a gas appliance. If this is not

practicable, the gas detector should be installed in the room where a gas escape is most likely to

occur; this would typically be the kitchen, due to the presence of a gas cooker and other gas

appliances. 

The CHCO should be installed above the level of a possible gas escape and near the

ceiling (typically < 0.3m from the ceiling), in a place where air movements are not impeded by

furniture and furnishings. 

The location should not be vulnerable to impact or splashing during normal routine operations such as 

cleaning in the area.  For further information see BS EN50292 and BS EN50244

Fuel Burning 

Appliance

A

A

B

B

D

D

C

Flue or Extractor 

Canopy

Key to Positioning Diagram 

Fuel Burning Appliance: This could be a Fire, Cooker, Boiler, or any other gas fired appliance.

Flue or Extractor canopy: Used to remove the products of combustion from the room under normal cir-

cumstances.

Dimension A - 1m

Dimension B -  0.15m

Dimension C - Maximum distance from appliance - 3m CO and 5m Natural Gas. 

Dimension D - For Natural Gas < 0.3m - For CO < the distance from the ceiling to the top edge of any open-

able window and any door. 

The CHCO resets automatically however any connected devices such as Gas valves must be of a manual 

reset type. See 

Duomo EVRM Gas shut off valves

.  https://duomo.co.uk/product/evrm-manual-reset-sole-

noid-gas-valve/  

Summary of Contents for CHCO

Page 1: ...ct Duomo CHCO Natural Gas and Carbon Monoxide detector TYPE A 96125 THIS IS AN IMPORTANT DOCUMENT IT CONTAINS INFORMATION REGARDING INSTALLATION SAFE AND PROPER OPERATION AND REGULAR CHECKING OF THIS NATURAL GAS AND CARBON MONOXIDE DETECTOR ...

Page 2: ...or tech nology The Duomo CHCO detector is ideally suited for people with some physical disability that might de lay a manual response to an alarm It is a fixed wall mounted system with a permanently connected 230 Volt electrical supply The CHCO is fitted with an output function for trig gering different ancillary devices for example Gas Shut off valve If the apparatus is installed in homes equippe...

Page 3: ...noxide sensor element 6 On Light This light flashes as soon as power is applied After 100 seconds the light stops flashing and is permanently lit until power is disconnected Note During the diagnostic warm up phase the CHCO will not detect gas 7 Fault Light Becomes lit when either the Natural Gas or the CO sensor element becomes inoperative 8 Alarm CO Light 9 Alarm Gas light 10 Cable connection Te...

Page 4: ...s such as cleaning in the area For further information see BS EN50292 and BS EN50244 Fuel Burning Appliance A A B B D D C Flue or Extractor Canopy Key to Positioning Diagram Fuel Burning Appliance This could be a Fire Cooker Boiler or any other gas fired appliance Flue or Extractor canopy Used to remove the products of combustion from the room under normal cir cumstances Dimension A 1m Dimension B...

Page 5: ...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 not...

Page 6: ...uced by a given exposure CO is rapidly ab sorbed through the lungs diffuses across the alveolar capillary membrane and is reversibly bound with haemoglobin as carboxyhaemoglobin COHb The affinity of haemoglobin for CO is over 200 times its affinity for oxygen This reduces the oxygen carry ing capacity of the blood and has an effect on the dissociation of oxyhaemoglobin which further re duces the o...

Page 7: ...ning applianc es again until they have been checked and cleared for use by a competent person accord ing to national regulations Natural Gas is detected In the event of a Gas Alarm sounding and the ALARM GAS light being lit on the CHCO detec tor Fascia or the smell of gas even without an alarm Keep calm and carry out the following ac tions not necessarily in the order given extinguish all naked fl...

Page 8: ...ctivate an ancillary device such as a ven tilation fan or gas shut off valve Once triggered these devices may need to be manually reset but this should not be done until the source of carbon monoxide or fuel gas escape has been identified and the fault corrected 13 Maintenance This device should be tested periodically ideally every 6 months but a minimum of every 12 months The procedure is describ...

Page 9: ... RoHS and do not contain Lead Mercury Cadmium Hexavalent Chromium Chromium IV Polybrominated Biphenyls PBB Polybrominated Diphenyl Ethers PBDE GasTest Natural gas Mains Power Supply 230V AC within 2 of rating Volume Ratio of Gas Litres input up to 10 of L E L 3 Temperature 230C for the entire duration of the test 2 of rating Relative Humidity 45 for the entire duration of the test 10 Constant Baro...

Page 10: ... which could otherwise be caused by inappropriate waste handing of this product The recycling of materials will help to conserve natural resources For more detailed information about recycling of this product please contact your local city office your house hold waste disposal service or the shop where you purchased the product Attention in some countries of the European Union the product is not i...

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