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SUPPLY
ZONE PUMP
CIRCULATING PUMP
ROOM THERMOSTAT
MAINTENANCE
VALVE
MAINTENANCE
May be replaced with tandem
BLEEDING VALVE
VALVE
configuration - see illustration AA
AUTOMATIC
AIR VENT
TEMPERATURE /
OUTDOOR RESET
SAFETY VALVE
PRESSURE GAUGE
SENSOR
ZONE PUMP
LOAD
MANAGEMENT
AIR
CONTROL
PURGER
SHUT-OFF
VALVE
POWER SUPPLY
120V / 1Ø
ELECTRIC
PUMP POWER
WATER FEED
DRAIN
SUPPLY
BOILER
CONNECTION
ZONE PUMP
PRESSURE
MAINTENANCE
REDUCING VALVE
VALVE
EXPANSION
TANK
ZONE PUMP
WATER
FLOW
RETURN
DRAIN OR
PURGE VALVE
NOTE: Refer to table 4 for minimum flow rates based on boiler kW. Primary/secondary boiler piping is
recommended when system has more than two equally sized zones.
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