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* PRESSURE
RELIEF VALVE
* TEMPERATURE/PRESSURE
GAUGE
AIR VENT
TYPICAL BOILER HOT WATER PIPING SHOWING AIR REMOVAL SYSTEM, PROVISIONS FOR THE EXPANSION OF
WATER AND THE AUTOMATIC COLD WATER SUPPLY. ALSO SHOWN IS THE AUTOMATIC MIXING VALVE. THIS
COULD ALSO BE DONE BY (2) CLOSELY SPACED TEE'S. THE PROPER PIPING FOR THE INTENDED USE WILL BE
DETERMINED BY THE INSTALLING CERTIFIED PLUMBER OR HVAC CONTRACTOR.
UNION
SHUT-OFF
VALVE
* AQUASTAT
WELL
UNION
SYSTEM SUPPLY 1-1/4"
* ITEMS SUPPLIED
** OPTIONAL
PRESSURE REDUCING VALVE (PRV)
OR COMBINATION PRV AND
RELIEF VALVE
* BOILER DRAIN, 1/2" NPT MALE X
3/4" HOSE MALE (NOT SHOWN)
SENSING BULB
EXPANSION TANK
(DIAPHRAGM TYPE)
SHUT-OFF VALVE
PIPE TO WITHIN 6" OF THE
FLOOR OR A FLOOR DRAIN
SYSTEM RETURN 1-1/4"
** THERMOMETER
CHECK VALVE (OR BACKFLOW
PREVENTER IF REQUIRED)
** THERMOMETER
NOTE: ALWAYS REFER TO THE INDIVIDUAL COMPONENTS RECOMMENDED
INSTALLATION INSTRUCTIONS FOR THE PROPER MOUNTING POSITION AND
LOCATION WITHIN THE PIPING SYSTEM.
AIR SCOOP
AUTOMATIC
MIXING VALVE
COLD WATER
SUPPLY 1/2"
SYSTEM SUPPLY 1-1/4"
SHUT-OFF VALVE
Cold return water temperature (Sustained temperatures below 140 degrees Fahrenheit) will lead to condensation in the
rebox. This moisture can lead to creosote formation. To help minimize moisture and creosote, it is strongly recommended that
some form of temperature balance is incorporated into the return water system.
All of the pressurized system components shown are not nec-
essary. Air vents or bleeders will need to be removed from the plumbing system to prevent air from entering the lines. Control
Dipswitch #6 will need to be turned “ON”.