Carrier BW4 Installation, Start-Up, And Operating Instructions Manual page 2

SAFETY CONSIDERATIONS .....................................................................................................................................................................................3
INTRODUCTION ..........................................................................................................................................................................................................3
BOILER RATINGS AND CAPACITIES.....................................................................................................................................................................4
Explanation of Model Numbers and Rating Plate...................................................................................................................................................4
General Information..................................................................................................................................................................................................4
LOCATING THE BOILER...........................................................................................................................................................................................5
INSTALLATION REQUIREMENTS...........................................................................................................................................................................6
FRESH AIR FOR COMBUSTION ...........................................................................................................................................................................6-7
Boiler Located in Unconfined Space .......................................................................................................................................................................6
Boiler Located in Confined Space........................................................................................................................................................................6-7
BOILERS WITH TANKLESS HEATER COIL ..........................................................................................................................................................8
Mounting Aquastat Control ......................................................................................................................................................................................8
Tankless Coil Piping.................................................................................................................................................................................................8
INSTALLATION—SYSTEM PIPING......................................................................................................................................................................8-9
CHIMNEY AND CHIMNEY CONNECTION.....................................................................................................................................................10-11
Checking Chimney..................................................................................................................................................................................................10
Chimney Connector and Draft Regulator ..............................................................................................................................................................10
Minimum Vent Pipe Clearance ..............................................................................................................................................................................10
Optional Power Venting .........................................................................................................................................................................................10
ELECTRICAL WIRING ........................................................................................................................................................................................12-14
Installing Thermostat (Not Provided) ....................................................................................................................................................................12
Grounding................................................................................................................................................................................................................12
Electric Power Supply ............................................................................................................................................................................................12
Connecting 115-v Electric Wiring to Boiler..........................................................................................................................................................12
Thermostat Connections .........................................................................................................................................................................................12
Thermostat Heat Anticipator Adjustment ..............................................................................................................................................................12
Wiring Diagrams ...............................................................................................................................................................................................13-14
EQUIPMENT AND OPTIONAL ACCESSORIES....................................................................................................................................................15
Relief Valve (Provided)..........................................................................................................................................................................................15
Expansion Tank (Not Provided).............................................................................................................................................................................15
Diaphragm-Type Expansion Tank (Not Provided)................................................................................................................................................15
Air Eliminating Fitting (Air Purger) (Not Provided) ............................................................................................................................................15
Main Air Vent for Downflow Systems or Diaphragm-Type Expansion Tank (Not Provided) ..........................................................................15
Aquastat Relay Control (Provided) ........................................................................................................................................................................15
Automatic Fill Valve (Not Provided) ....................................................................................................................................................................15
Drain Valve (Provided) ..........................................................................................................................................................................................15
Circulating Pump (Provided)..................................................................................................................................................................................15
FILLING BOILER..................................................................................................................................................................................................15-16
How a Hot-Water System Operates.......................................................................................................................................................................15
Filling System with Water ................................................................................................................................................................................15-16
OPERATING BOILER ..........................................................................................................................................................................................16-18
To Start....................................................................................................................................................................................................................16
Fuel Units and Oil Lines ........................................................................................................................................................................................16
Air Supply for Combustion ....................................................................................................................................................................................16
Draft Regulators (Provided) ...................................................................................................................................................................................16
Nozzles (Provided)..................................................................................................................................................................................................16
Final Burner Adjustments.......................................................................................................................................................................................16
Oil Burner Maintenance ....................................................................................................................................................................................16-18
CHECKING AND ADJUSTING CONTROLS..........................................................................................................................................................18
Adjusting Operating Controls.................................................................................................................................................................................18
Checking Thermostat Operation.............................................................................................................................................................................18
MAINTENANCE....................................................................................................................................................................................................18-19
Relief Valve ............................................................................................................................................................................................................18
Expansion Tank ......................................................................................................................................................................................................19
Water System ..........................................................................................................................................................................................................19
Tankless Coil (or Cover Plate) Gasket ..................................................................................................................................................................19
OIL BOILER/BURNER CLEANING INSTRUCTIONS .....................................................................................................................................19-20
SEQUENCE OF OPERATION—BOILER WITH COIL.....................................................................................................................................20-21
High Limit Controller.............................................................................................................................................................................................20
Low Limit and Circulator Controller.....................................................................................................................................................................20
SERVICE HINTS ........................................................................................................................................................................................................21
REPAIR PARTS.....................................................................................................................................................................................................22-24
INDEX
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