Carrier BW9 User Manual page 3

Typical boiler and piping arrangements are shown in Fig. 3 through 6. Since there are many variations in boiler piping systems,
your system may not look the same as shown. Your dealer is your best resource to explain your particular boiler piping arrangement.
BW9 050, 075, 100
Typical Single Zone Piping
BW9 050, 075, 100
Typical Multi-Zone Piping
PRE-MIX BURNER
SIGHT GLASS
TEMPERATURE/
PRESSURE GAUGE
GAS VALVE
CONDENSATE TUBE BOILER DRAIN
BW9 050, 075, 100
Component Location
3
5
INTEGRATED
BOILER CONTROL
WITH DIAGNOSTICS
CONTROL PANEL
AIR PRESSURE SWITCH
TRANSFORMER
EXHAUST TEE WITH DRAIN
FLUE EXHAUSTER
7
SERVICE
VALVE
CIRCULATOR
CAN VENT
SHUT OFF VALVE
PURGE VALVE
SERVICE
VALVE
EXPANSION TANK
BW9 125, 150, 175, 200
Typical Single Zone Piping
ZONE VALVE
PRESSURE
REDUCING VALVE
CIRCULATOR
CAN VENT
EXPANSION TANK
SHUT OFF VALVE
PURGE VALVE
BW9 125, 150, 175, 200
Typical Multi-Zone Piping
LOW WATER CUT-OFF
MANUAL GAS
SHUT-OFF
COMBUSTION
AIR INTAKE
EXHAUST TEE
WITH DRAIN
BOILER DRAIN
BW9 125, 150, 175, 200
Component Location
—3—
SUPPLY TO
SYSTEM
GATE VALVE
FEED
WATER
REDUCED PRESSURE
BACKFLOW PREVENTER
PRESSURE
REDUCING VALVE
RETURN FROM
SYSTEM
ZONE SERVICE
VALVE
SUPPLY TO
ZONES
ZONE SERVICE
VALVE
GATE VALVE
REDUCED PRESSURE
FEED BACKFLOW PREVENTER
WATER
RETURN FROM
ZONES
ZONE SERVICE
VALVE
ZONE SERVICE
VALVE
SIGHT GLASS HOT SURFACE
IGNITOR
PRE-MIX
BURNER
COMBUSTION
AIR BLOWER
INTEGRATED BOILER
CONTROL WITH
DIAGNOSTICS
PRESSURE
SWITCHES
4
6
8