Page 16 BRADFORD WHITE CORP.
PRIMARY/SECONDARYMANDITORY FOR ALL
VARIABLEFLOW SYSTEMS
INSTALLAIR VENTS AT HIGH POINTS IN SYSTEM
PIPING& SIZING OF EXPANSION TANK
PERTANK MANUFACTURER'S INSTRUCTIONS
DIMENSION"C" (COMMON PIPING) TO BE FOUR
PIPEDIAMETERS, MAX. (NO ELBOWS OR VALVES)
BOILERCIRCUIT PIPING MUST BE EQUAL
TOBOILER WATER CONNECTION SIZE
BOILERCIRC. PUMP SIZED FOR FLOW THROUGH BOILER
DOTTEDDEVICES INDICATE ALTERNATELOCATIONS
PUTBOILER CONTROL SENSOR IN THE SYSTEM
C
PUMPLOCATION FOR PUMP-MOUNTED UNITS
SYSTEMPUMP
MAKE-UP
COLDWATER
SUPPLY
SYSTEM
PUMPLOCATION FOR
NON-PUMP-MOUNTEDUNITS
RETURN
SYSTEM
SUPPLYWHEN USING THIS PIPING STYLE.
MINIMUMBOILER INLET WATER TEMPERATURE
MUSTBE AT LEAST 120°F.
C
ADJUSTMENTPROCEDURE TO MAINTAIN
120°FINLET TEMP:
1.Turn on boiler and open valves A&B.
2.After steady-state operation, if T1 is less than
slowlyclose valveBuntil T1 climbs to
120°F.
3.If T1 is greater than 120°F, slowly close
untilT1 dropsto120°F.
4.Check after system operating temperature
hasstabilized. Make final adjustments.
120°F,
valveA
A
B
T1
B
A
T1
LEGEND
CHECKVALV E
THERMOMETER
TEMPERATURE
SENSOR
GLOBEVALV E
EXPANSIONTANK
WITHAIR SCOOP AND
AUTOAIR VENT
3-WAYVA LVE
VALVE
CAUTION:THIS DRAWING SHOWS SUGGESTED
PIPINGCONFIGURATION AND VALVING,CHECK
WITHLOCAL CODES AND ORDINANCES FOR
ADDITIONALREQUIREMENTS.
PRESSUREREDUCING VALV E
W/FAST FILL BYPASS
PURGE
VALVE
PUMP