LAARS Pennant PNCV (Sizes 500-2000) - Install and Operating Manual - Manual (Page 17)

Pennant (500-2000) Page 17
Figure 6. Hydronic Piping — One Boiler, Multi-Temperature System.
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)
BOILER CIRCUIT PIPING MUST BE EQUAL
TO BOILER WATER CONNECTION SIZE
BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER
DOTTED DEVICES INDICATE ALTERNATE LOCATIONS
PUT BOILER CONTROL SENSOR IN THE SYSTEM
PUMP LOCATION FOR PUMP-MOUNTED UNITS
SYSTEM PUMP
MAKE-UP
COLD WATER
PUMP LOCATION FOR
NON-PUMP-MOUNTED UNITS
SUPPLY WHEN USING THIS PIPING STYLE.
MINIMUM BOILER INLET WATER TEMPERATURE
MUST BE AT LEAST 120°F.
C
C
C C 180°F
180°F
150°F
130°F
NOTES:
1. BOILER LOOP IN EXAMPLE IS MAINTAINED AT 180°F.
2. ZONE THERMOSTATS CAN BE INTERLOCKED WITH BOILER,
SO THAT BOILER FIRES UPON CALL FOR HEAT FROM ANY
ZONE.
3. ZONE PIPING AND INTERLOCK WIRING TO BE DESIGNED
BY SYSTEM ENGINEER.
LEGEND
CHECK VALVE
THERMOMETER
TEMPERATURE
SENSOR
GLOBE VALVE
EXPANSION TANK
WITH AIR SCOOP AND
AUTO AIR VENT
3-WAY VALVE
VALVE
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS
PURGE
VALVE
PUMP