LAARS Mighty Therm HH-PH (Sizes 175-400) - Installation, Operation and Maintenance Instructions - Manual (Page 14)

LAARS HEATING SYSTEMS Page 14
OPTIONAL PUMP MOUNTED UNIT AVALIABLE
BOILER CIRC.
PUMP
COLD WATER
MAKE-UP
SYSTEM PUMP
SYSTEM
RETURN
SYSTEM
SUPPLY
C
THERMOMETER
GLOBE VALVE
CHECK VALVE
PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS
EXPANSION TANK
WITH AIR SCOOP AND
AUTO AIR VENT
PUMP
LEGEND
VALVE
TEMPERATURE
SENSOR
3-WAY VALVE
PURGE
VALVE
INSTALL AIR VENTS AT HIGH POINTS IN SYSTEM
PIPING & SIZING OF EXPANSION TANK
PER TANK MANUFACTURER'S INSTRUCTIONS
PRIMARY/SECONDARY MANDITORY FOR ALL
VARIABLE FLOW SYSTEMS
BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER
BOILER CIRC. PUMP TO BE USED WITH EM
DOTTED DEVICES INDICATE ALTERNATE LOCATIONS
BOILER CIRCUIT PIPING MUST BE EQUAL TO
BOILER WATER CONNECTION SIZE
SYSTEM TEMP. INTERLOCK REQUIRED
MULTIPLE STAGE BOILERS RECOMMENDED
PUT BOILER CONTROL SENSOR IN THE OUTLET
WHEN USING THIS PIPING STYLE
2
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING. CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
DIMENSION ''C'' TO BE 4 PIPE DIAMETERS
DIMENSION ''D'' TO BE 18" MINIMUM
D
Figure 24. Hydronic Piping - Primary-Secondary, Reverse-Return.
Figure 25. Hydronic Piping - Primary-Secondary, Reverse-Return, Low Temperature.