Mains Powered Interconnectable CO Detector - Kidde 4239HIR

The table below shows all the units that can interconnect with the KE423/9HIR and KE423D/9HIR mains powered CO alarms.

Model Number	Type of unit	Type of interconnection
KE4870	Ionisation Alarm	Hard wire interconnection
KE4881	Ionisation Alarm with Rechargeable Lithium Battery	Hard wire interconnection
KE4973	Optical Alarm	Hard wire interconnection
KE4985	Optical Alarm with Rechargeable Lithium Cell	Hard wire interconnection
KE4892	Heat Alarm	Hard wire interconnection
KE4899	Heat Alarm with Rechargeable Lithium Battery	Hard wire interconnection

Model Number	Type of unit	Type of interconnection
KE1239HI	Ionisation Alarm with Alkaline Battery	Hard wire interconnection
KE1239HILL	Ionisation Alarm with Lithium Battery	Hard wire interconnection
KE2239HI	Optical Alarm with Alkaline Battery	Hard wire interconnection
KE2239HILL	Optical Alarm with Lithium Battery	Hard wire interconnection
KE3239HI	Heat Alarm with Alkaline Battery	Hard wire interconnection
KE3239HILL	Heat Alarm with Lithium Battery	Hard wire interconnection

Technical Data

This is the technical data for the Mains Powered Interconnectable CO Detector - Kidde 4239HIR.

Sensitivity	30ppm (parts per million) CO gas
Visual Display	Backlit Digital Display
Warranty	6 Years
Dimensions (HxWxD)	147x147x42mm
Sound Output	85dB (minimum) at 3m
Temperature Range	4°C to 38°C
Humidity Range	15% to 95% Relative Humidity
Power Type	Mains Powered

Product Datasheets

The following datasheets are available for this product.

• kidde-4239H-Datasheet
• kidde-4239H-User-Manual

Q. I purchased 4 alarms for my property recently via Safelinc's website. My electrician has installed them over the weekend.

However we have the following issue:

When you press the test button on the Carbon monoxide alarm the carbon monxide alarm goes off (but no alarm sound is heard on the other 3 connected smoke alarms).

This seems strange given that when you test any of the 3 smoke alarms, an alarm sound can be heard on the carbon monoxide alarm.

Is this meant to be like this?

The alarm models are:

1. Carbon Monoxide Firex 4985
2. Firex Ioisation 4881
3. Firex Ionisation 4870
4. Firex Optical 4985

A. The reason is the relevant British Standard which requires a different alarm sound for CO alarms in comparison to smoke alarms.

To achieve this, the CO alarm in question has a dual sound capability, meaning that

- if a smoke alarm is triggered or tested, the CO alarm detects that a smoke alarm has gone off and will activate one of its two internal sounders (sounding like a smoke alarm).

- if the CO alarm is tested or triggered, only the CO alarm sounds (sounding like a CO alarm). The smoke alarms are in this case not allowed to sound. As said above, this is a stipulation from BSI