INSTALLATION AND OPERATION INSTRUCTIONS
6
SFC COMBI BOILERS SFC-99, SFC-125
2.6 SPACE HEATING ..................................................2-6
2.6.1 Overview .....................................................2-6
2.7 SEQUENCE OF OPERATION ........................................2-7
3.0 STARTUP & COMMISSIONING ..............................3-1
3.1 LIGHTING & SHUTTING DOWN THE UNIT .............................3-1
3.2 PRIOR TO START-UP ..............................................3-2
3.2.1 Pre-Ignition Checks ............................................3-2
3.2.2 Test Ignition Safety Shutoff ......................................3-2
3.3 COMMISSIONING .................................................3-2
3.4 FUEL CONVERSION ...............................................3-4
3.4.1 Gaining access to combustion chamber, burner removal instructions .......3-5
4.0 MAINTENANCE..........................................4-1
4.1 UNIT MAINTENANCE ..............................................4-1
4.1.1 General Care .................................................4-1
4.1.2 Inspection ...................................................4-1
4.1.3 Venting .......................................................4-1
4.1.4 Condensate Trap ...............................................4-1
4.1.5 Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.6 Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.7 Pump ........................................................4-2
4.1.8 Gas Piping ....................................................4-2
4.1.9 Control Module.................................................4-2
4.1.10 Water Heating System ..........................................4-2
4.1.11 Freeze Protection ..............................................4-2
4.1.12 System Treatment .............................................4-3
4.1.13 Relief Valve - Maintenance and Testing .............................4-3
4.1.14 Domestic Hot Water System .....................................4-3
4.1.15 Fan and gas valve removal instructions ............................4-4
4.1.16 Fan and gas valve re-assembly instructions .........................4-4
5.0 TROUBLESHOOTING .....................................5-1
5.1 Preliminary Checks.................................................5-1
5.2 Electronic Components..............................................5-2
5.2.1 Temperature Sensors ............................................5-2
5.2.2 Fan/Blower ...................................................5-3
5.2.3 Thermostat Connections .........................................5-3
5.2.4 Water Pressure Sensor-Type Low Water Cut Off (LWCO) ...............5-3
5.2.5 Flue Gas Temperature Sensor .....................................5-4
5.2.6 Domestic Hot Water Flow Sensor ..................................5-4
5.2.7 Domestic Hot Water Sensor.......................................5-4
5.2.8 Outdoor Sensor ................................................5-4
5.2.9 DHW Tank Sensor ..............................................5-5
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