Laars OMNITHERM ONH1250 Assembly, Installation And Operation Instructions page 3

O T
The MNI HERM
SECTION 8 (continued)
8.C.6 Time & Date .............................................60
8.D Configuration ............................................61
8.D.1 CH (Central Heat) .....................................62
8.D.1.a CH1 (Central Heat, One) .......................... 62
8.D.1.a.1 PID Low ....................................................63
8.D.1.a.2 PID High ...................................................63
8.D.1.b CH2 (Central Heat, Two) .......................... 63
8.D.2 DHW (Domestic Hot Water) ...................... 64
8.D.3 Outdoor Reset .........................................64
8.D.4 Cascade ..................................................66
8.D.4.a Cascade Parameters ...............................67
8.D.4.a.1 Base / Drop Load ...................................... 68
8.D.4.b Rotation ...................................................68
8.D.4.b.1 Rotation Setup .........................................69
8.D.4.c Redundancy .............................................69
8.D.6 Pumps .....................................................70
8.D.6.a Vari-Prime .................................................71
8.D.7 Manual Firing Rate ..................................72
8.D.7 Temp Limits .............................................72
8.D.8.a Delta T Parameters ...................................73
8.D.8.b Flue Limitation Parameters ....................... 73
8.D.8.c Outlet Limitation Parameters .................... 73
8.D.9 External ...................................................74
8.D.9.a External - Remote Set Point .................... 75
8.D.10 Time & Date .............................................75
8.D.11 Miscellaneous Features ......................... 76
8.D.11.a Demands Priorities .................................77
8.D.11.b Anti-Short Cycle .......................................77
8.D.11.c Warm Weather ........................................78
8.D.11.d COM Port, BMS .......................................79
8.D.11.e Temperature Conversion ......................... 79
8.D.11.f Anti-Frost .................................................80
8.D.12 Login ........................................................81
8.E Service Screens .......................................82
8.E.1 Burner (Enable/Disable ............................ 82
8.E.2 Digital I/O Inputs ......................................83
8.E.2.a Digital Outputs ..........................................83
8.E.3 Analog I/O .................................................84
8.E.4 Screen Settings Timeout .......................... 85
8.E.5 History.......................................................85
8.E.6 Restart Touchscreen & Recalibrate .......... 86
8.E.7 Factory Reset ...........................................86
8.E.8 HMI Model OEM only. .............................. 86
8.E.9 BIC Model OEM only ............................... 86
8.E.10 Both Models. OEM only. ......................... 86
8.E.11 About the Firmware of the touchscreen. .. 86
8.E.12 Dev Fan ...................................................86
8.E.13 Fan Settings ...........................................86
8.F Messages and USB ..................................87
8.F.1 Messages .................................................87
8.F.2 USB Functionality .....................................87
8.G Active Demands .......................................88
SECTION 9 Gas Valve Touchscreen,
Menus and Descriptions
9.A About the Gas Valve .................................89
9.B Menu Structure (Example) ....................... 90
9.C Gas Valve Display Navigation and Menus 90
9.D Fuel Air Ratio & Ignition, Menus ............... 93
9.D.1 OEM..........................................................93
9.D.2 Ignition Menu
9.D.3 Base Curve Menu ...................................95
9.D.4 Correction Curve Menu ............................ 95
9.D.5 Summary Menu ........................................96
9.D.6 Load & Save Menu .................................. 96
9.E Diagnostics ..............................................97
9.F Verification Menu ......................................98
9.G Gas Valve Password & Login Menu ...... 100
SECTION 10 Parameter Tables
SECTION 11 Initial startup Instructions
11.A Filling the Boiler System ......................... 105
11.B Initial Operation ......................................106
11.B.1 Initial Burner Operation ........................... 106
11.C Shutting Down the Unit ........................... 106
11.D Restarting the Unit ..................................106
11.E Combustion setup ...................................107
11.E.1 Firing Rate for Boiler ...............................107
11.E.2 Combustion at the Gas Valve Display .... 108
SECTION 12 Maintenance
12.A System Maintenance .............................109
12.B Maintenance Notes .................................109
12.B.1 Burner .....................................................109
12.B.2 Gas Valve / Venturi .................................109
12.B.3 Main Controller ....................................... 110
12.B.4 Valve Control / Display ............................ 110
12.B.5 Spark & Flame Sensors Electrodes ........ 110
12.B.6 Blower ..................................................... 110
12.B.7 Heat Exchanger Tubes ........................... 110
12.B.8 Gas Pressure Switches .......................... 111
SECTION 13 Troubleshooting
13.A Error Codes ............................................ 112
13.B SV2 Fault Codes .................................... 116
SECTION 14 Replacement Parts
14.A General Information ................................123
14.B Component Illustrations, Parts Lists,
and Part Numbers ...........................123-135
ii
.....................................94
.................... 101