Table Of Contents - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual

Page 2
SECTION 1 General Information
1.A Introduction .................................................5
1.B Warranty .....................................................5
1.C Model Identification ..................................... 5
1.D Safety Notes ...............................................6
1.E Unit Dimensions and Components ............. 8
1.E.1 Model 1250 / 1500 ...................................... 8
1.E.2 Model 1750 ...............................................10
1.E.3 Models 2000 / 2500 .................................. 12
1.F Unpacking .................................................14
1.G Locating the Unit .......................................14
1.H Clearances ...............................................14
SECTION 2 Venting and Combustion Air
2.A General Venting Info ................................. 15
2.A.1 Vent and Air Pipe Sizing .......................... 15
2.A.1.a Category II Vent ........................................16
2.A.1.b Category IV Vent ......................................16
2.A.2 Vent and Air Pipe Material ........................ 16
2.A.3 Exhaust Vent Terminal .............................. 17
2.A.4 Air for Combustion and Ventilation ........... 17
2.A.4.a Combustion Air From Room ..................... 17
2.A.4.b Ducted Combustion Air ............................. 17
2.B Common Venting ......................................18
2.B.1 Common Venting ......................................18
2.B.2 Removing a Boiler From an
Existing Common Vent System ................ 18
2.C Locating Vent & Combustion
Air Terminals .............................................20
2.C.1 Side Wall Vent Terminal ............................ 20
2.C.2 Side-wall Combustion Air Terminal .......... 21
2.C.3 Vertical Vent Terminal ............................... 21
2.C.4 Vertical Combustion Air Terminal .............. 21
2.D Outdoor Installation .................................. 23
2.E Installations in the
Commonwealth of Massachusetts ........... 24
SECTION 3 Gas supply and Piping
3.A Gas Supply and Piping ............................. 24
3.B Gas Pipe Sizing ........................................25
SECTION 4 Water Flow and Headloss Data
4.A General Water Flow Information ............... 25
4.B Boiler Water Flow & Headloss Data ......... 26
4.C Water Heater Flow and Headloss Data .... 26
4.D Recovery Data ..........................................27
SECTION 5 Piping
5.A Boiler Water Piping ...................................28
5.A.1 Boiler Water Connections ......................... 28

Table of Contents

5.A.2
5.A.3
5.A.4
5.B
5.B.1
5.B.2
5.B.3
5.B.4
5.B.5
SECTION 6 Condensate Drain Trap
SECTION 7 Electrical Connections
7.A
7.B
7.C
7.D
7.E
7.E.1
7.E.2
7.E.3
7.E.4
7.E.5
7.E.6
7.E.7
7.E.8
7.E.9
7.E.10
7.E.11
7.E.12
7.F
7.G
7.H
7.I
SECTION 8 Control Operation
8.A
8.A.1
8.A.2
8.B
8.C
8.C.1
8.C.1.a
8.C.1.b
8.C.2
8.C.3
8.C.4
8.C.5
8.C.6
i
Cold Water Make-Up ................................28
Freeze Protection .....................................28
Suggested Boiler Piping Schematics ...29-31
Water Heaters ...........................................32
Water Quality ............................................32
Heater Water Connections ....................... 32
Cold Water Make-Up ................................32
Freeze Protection ....................................32
Suggested Piping Schematics ................. 32
Installation Warnings ................................ 34
Main Power Connections .......................... 35
Main Power Data ......................................35
Control Panel Layout ................................ 36
Field Connections .....................................36
Power .......................................................37
Boiler Pump ..............................................37
Dry Contacts .............................................37
Alarm Bell .................................................37
Sensors ....................................................37
Heat Demands ..........................................38
Spare Inputs .............................................38
Inputs, BMS .............................................38
Outputs, Pump ..........................................38
Dry Contacts (Run & Alarm) ..................... 38
RS 485 for Cascade (Lead Lag) ............. 38
RS485 BMS ..............................................39
Modbus/BACnet Memory Map ............41-43
Wiring Diagrams, High Voltage ................. 44
Ladder Diagrams .................................49-55
Wiring Diagram .........................................56
The Home Screen ....................................58
Home Screen Active Icons ....................... 58
Keypad Operations ...................................59
Login to Lock / Unlock the Disp Screen .... 60
Quick Start ..............................................61
CH (Central Heat) ....................................61
CH1 (Central Heat, One) 1 ...................... 62
CH2 (Central Heat, Two) 2 ..................... 62
DHW (Domestic Hot Water) .................... 62
Outdoor Reset .........................................62
Warm Weather Shut Down ..................... 63
Anti-Short Cycle .......................................64
Time & Date .............................................64
.............. 34