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Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-15
3.7 814H HEAT DETECTOR
3.7.1 GENERAL
The 814H is an analogue thermal detector. The detector senses the air temperature and
sends this value to the MXP. The MXP makes any decisions as to whether this is an alarm,
fault, normal or whatever. The MXP can be programmed (at the MX4428 panel) to interpret
the values to implement a Type A, Type B, Type C, or Type D Heat Detector. The integral
LED is turned on by the MXP when an alarm is detected.
The 814H has a temperature sensing range of -25°C to 95°C. The approved operating
temperature range is -10°C to +70°C. The accuracy of the 814H (as interpreted by the
MXP), within the range 0°C to 70°C, is typically + / - 2°C.
The remote LED and functional base outputs are programmable for their functionality (refer
to section
3.3).
3.7.2 814H SPECIFICATIONS
Line Connections L(–), L1(+)
Supply Voltage: 20Vdc - 40Vdc
Supply Current: 250uA (typical quiescent)
Alarm Current: 3.0mA (typical)
Remote LED Current: 7mA (Tyco E500Mk2)
Dimensions: 110mm (diameter) x 55mm (including MUB base)
Weight 79g
Base MUB, 5B, 5BI, 814RB, 814SB, or MkII Sounder Base
3.7.3 MX4428 PROGRAMMING OPTIONS - 814H
The programming values for the 814H are described in the following tables.
“Mode” enables or disables rate of rise processing. Mode = 4 selects type A/C (heat rate of
rise enabled), and mode = 5 selects type B/D (heat rate of rise disabled). Only select one of
these two values. (Note that when rate of rise is disabled, the parameters relating to rate of
rise are ignored - there is no need to adjust them.)
For type C and D operation set the heat fixed temperature alarm threshold (Parameter 1) to
93 (°C).
Parameter 0 may be adjusted to select a different Pre-Alarm temperature.
For special purposes, the fixed temperature alarm threshold may be set to any value
between 60 and 93 for Australia, and between 50 and 80 for New Zealand. In New Zealand
also set the global parameter “8XX HEAT SL1” to (the highest alarm temperature - 20) / 10
(rounded up if the result is fractional).
For functional base and remote LED programming set Parameter 6 as per the table. Refer
to section
3.3 for further details.
The remaining parameters should not need changing.