Laars Pennant PNCH Installation And Operation Instructions Manual page 18

Page 18
SYSTEM
RETURN
PUMP LOCATION FOR
NON-PUMP-MOUNTED UNITS
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
LEGEND
THERMOMETER
PURGE
TEMPERATURE
VALVE
SENSOR
GLOBE VALVE
CHECK VALVE
PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS
Figure 7. Hydronic Piping - Primary-Secondary, Reverse-Return.
C
PUMP LOCATION FOR PUMP-MOUNTED UNITS
PRIMARY/SECONDARY MANDITORY FOR ALL
VARIABLE FLOW SYSTEMS
INSTALL AIR VENTS AT HIGH POINTS IN SYSTEM
PIPING & SIZING OF EXPANSION TANK
PER TANK MANUFACTURER'S INSTRUCTIONS
DIMENSION "C" (COMMON PIPING) TO BE FOUR
PIPE DIAMETERS, MAX. (NO ELBOWS OR VALVES)
EXPANSION TANK
BOILER CIRCUIT PIPING MUST BE EQUAL
WITH AIR SCOOP AND
AUTO AIR VENT
TO BOILER WATER CONNECTION SIZE
BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER
DOTTED DEVICES INDICATE ALTERNATE LOCATIONS
3-WAY VALVE
PUT BOILER CONTROL SENSOR IN THE SYSTEM
VALVE SUPPLY WHEN USING THIS PIPING STYLE.
MINIMUM BOILER INLET WATER TEMPERATURE
MUST BE AT LEAST 120°F.
PUMP
LAARS Heating Systems
COLD WATER
MAKE-UP
SYSTEM PUMP
SYSTEM
SUPPLY