Tyco MX4428 - Manual (Page 39)

Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-23
3.10 814CH CARBON MONOXIDE + HEAT DETECTOR
3.10.1 GENERAL
The 814CH is a carbon monoxide (CO) detector which also includes a temperature sensor.
The detector senses the amount of CO present and the temperature and sends these values
to the MXP. The MXP makes any decisions as to whether this is an alarm, fault, normal or
whatever, based on the CO level, temperature, or rate of rise of temperature, and/or a
combination of these. The integral LED is turned on by the MXP when an alarm is detected.
Refer to the specifications of the 814H for more details on the heat sensing element of the
814CH.
The remote LED and functional base outputs are programmable for their functionality (refer
to section 3.3).
3.10.2 814CH SPECIFICATIONS
Line Connections L(–), L1(+)
Supply Voltage 20Vdc - 40Vdc
Supply Current 275uA (typical quiescent)
Alarm Current 3.0mA (typical)
Remote LED Current 7mA (typical Tyco E500Mk2)
Dimensions 110mm (diameter) x 55mm (including MUB base)
Weight 88g
Base MUB, 5B, 5BI, 814RB, 814SB, or MkII Sounder Base
3.10.3 MX4428 PROGRAMMING OPTIONS - 814CH
The programmable values for the 814CH are described in the following tables.
The mode selects the detection mode for the detector - CO only, enhanced CO, heat
enabled or disabled, heat rate of rise enabled or disabled, etc. Note that when a particular
function is disabled by the setting of the mode, the parameters relating to that function are
not used and should therefore be left with their default settings.
Parameter 1 selects the CO alarm threshold. Some possible settings are shown in the table.
Note the alternate setting of 66ppm is not an SSL listed setting for an ionisation detector (the
814CH was SSL tested using the tests for an ionisation detector under AS1603.2, as at the
time there was no approved standard for CO detector). Although this setting is acceptable
for a CO detector it should only be used for special applications where installation conditions
exclude other smoke detectors and yet the background CO level may be higher than normal.
At this sensitivity the background CO level should not exceed 30ppm.
Parameter 3 may be adjusted to vary the fixed temperature alarm threshold. It may be set to
any value between 60 and 65 in Australia.
Parameter 2 may be adjusted to select a different Pre-Alarm temperature.
Parameter 6 selects the functional base and remote LED output operation (refer to section
3.3) and the “enhancement multiplier” which should normally be left at the default value (12).