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281 Issue 1 - Service Manual - BX3

Table of Contents

1.0 HEATER OPERATION .............................................................................. 1

1.1 Operation Overview ................................................................................... 1

1.2 Circuit Diagram ......................................................................................... 2

1.3 Wiring Colour Code ................................................................................... 3

1.4 BX315 Technical Information .................................................................... 4

1.5 BX320 Technical Information .................................................................... 5

1.6 BX326 Technical Information .................................................................... 6

1.7 Motor Wiring Diagrams .............................................................................. 7

2.0 Thermostat Installation and Wiring ............................................................ 8

3.0 COMPONENT OPERATION ................................................................... 10

3.1 BX3 Gas Ducted Unit Components ......................................................... 10

3.2 Gas Valve Operation ............................................................................... 10

3.3 Spark Igniter ............................................................................................ 11

3.4 Flame Sensor .......................................................................................... 11

3.5 Combustion Fan Operation ..................................................................... 11

3.6 Burner ..................................................................................................... 12

3.7 HCDSI24 -1 Control Board ...................................................................... 12

3.8 Pressure Switch ...................................................................................... 13

3.9 Main Fan Assembly Operation ................................................................ 13

3.10 Operation Flow Charts ........................................................................... 14

3.11 Heater “Shut down” Flow Chart ............................................................. 15

4.0 INSTALLATION & COMMISSIONING ..................................................... 16

5.0 TROUBLESHOOTING ............................................................................ 16

5.1 LED Flash Codes .................................................................................... 16

5.2 One Flash - Over Heat Condition ............................................................ 18

5.3 Two Flashes - Pressure Switch Inactive .................................................. 19

5.4 Three Flashes – Purge / Interwait ............................................................ 20

5.5 Four Flashes - Pressure Switch Lockout ................................................. 20

5.6 Five Flashes – Ignition Lockout ............................................................... 20

5.7 Six Flashes – Valve Fault Lockout ........................................................... 20

5.8 Seven Flashes – Over Temp Lockout ..................................................... 21

Brivis BX3 User Manual

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