Document: LT0273

MX4428 MXP Engineering / Technical Manual

 

Device Information and Programming

 

 

3.7

814H HEAT DETECTOR

3.7.1GENERAL

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).

3.7.2814H 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

3.7.3MX4428 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.

Issue 1.5

24 March 2006

Page 3-15

Page 31
Image 31
Tyco technical manual 814H Heat Detector, General, 2 814H Specifications, 3 MX4428 Programming Options 814H

MX4428 specifications

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