5
TABLE OF CONTENTS
3.29 - Accessing the internal components ................................................................ 41
3.30 - Converting the burner to use a different type of gas ..................................... 42
3.31 - Checking and adjusting the pressure of the gas supply ............................... 42
3.32 - Checking and adjusting the gas pressure at the burner ............................... 43
3.33 - Check CO2 level ................................................................................................ 43
3.34 - Adjusting the input rating to the required heat loss ....................................... 44
3.35 - Adjust the input rating to the required maximum efficiency .......................... 44
4 - MAINTENANCE ............................................................................... 45
4.1 - General cautions ................................................................................................. 45
4.2 - Cleaning the burner and the heat exchanger (flue-gas side) .......................... 45
4.3 - Burner flame ........................................................................................................ 46
4.4 - Safety relief valves .............................................................................................. 46
4.5 - Flue gas discharge .............................................................................................. 46
4.6 - Combustible material .......................................................................................... 46
4.7 - Draining the heating side of the heater ............................................................. 46
4.8 - Draining the domestic side of the heater........................................................... 46
5 - USE.................................................................................................. 47
5.1 - Control panel ....................................................................................................... 48
5.2 - Ignition procedure ............................................................................................... 48
5.3 - Summer operation............................................................................................... 48
5.4 - Winter operation .................................................................................................. 48
5.5 - Adjustments for winter operation ...................................................................... 49
5.6 - Room thermostat................................................................................................. 49
5.7 - Resetting the Ignition Module ............................................................................ 49
5.8 - Low water cut-off device .................................................................................... 49
5.9 - Manual Reset High-Limit Thermostat ................................................................ 49
5.10 - Heating Circulator Pump .................................................................................. 49
5.11 - Temperature-Pressure gauge ........................................................................... 49
5.12 - Gas valve service switch .................................................................................. 49
5.13 - Shut-off procedure ............................................................................................ 49
5.14 - Precautions against freezing ........................................................................... 50
5.15 - Flue gas discharge ............................................................................................ 50
5.16 - Abnormalities during operation ....................................................................... 50
6 - TROUBLESHOOTING .................................................................... 51
6.1 - Troubleshooting Sequence of operation to light the burner ........................... 51
6.2 - Troubleshooting Sequence of Operation for a Call for Heat ............................ 52
6.3 - Troubleshooting Sequence of Operation for a Call for D.H.W. ........................ 52
7 - SPARE PARTS ................................................................................ 53
8 - TECHNICAL DATA .......................................................................... 54
8.1 - Table of the technical data .................................................................................. 54
8.2 - Curves of residual head for central heating system ......................................... 55
8.3 - Curves burner pressure-input rating ................................................................. 55
8.4 - Curves Efficiency-input rating............................................................................ 55