LAARS Pennant PNCV (Sizes 200, 300, 400) - Install and Operating Manual - Manual (Page 17)

LAARS Heating Systems
Page 16 Pennant 200, 300, 400 Page 17
Figure 4. Hydronic Piping — Multiple Boilers, Primary Secondary System.
PRIMARY/SECONDARY MANDATORY 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
C
SYSTEM PUMP
MAKE-UP
COLD WATER
SUPPLY
SYSTEM
PUMP LOCATION FOR
PUMP-MOUNTED UNITS
RETURN
SYSTEM
SUPPLY WHEN USING THIS PIPING STYLE.
MINIMUM BOILER INLET WATER TEMPERATURE
MUST BE AT LEAST 120°F.
C
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
CHECK VALVE TEMPERATURE
SENSOR
VALVE PURGE VALVE
THERMOMETER GLOBE VALVE EXPANSION TANK
WITH AIR SCOOP AND
AUTO AIR VENT
PUMP PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS
3-WAY VALVE
Figure 5. Hydronic Piping — Multiple Boilers, Low Temperature System.
C
SYSTEM PUMP
MAKE-UP
COLD WATER
SUPPLY
SYSTEM
PUMP LOCATION FOR
PUMP-MOUNTED UNITS
RETURN
SYSTEM
PRIMARY/SECONDARY MANDATORY 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
SUPPLY WHEN USING THIS PIPING STYLE.
MINIMUM BOILER INLET WATER TEMPERATURE
MUST BE AT LEAST 120°F.
C
ADJUSTMENT PROCEDURE TO MAINTAIN
120°F INLET TEMP:
1. Turn on boiler and open valves A & B.
2. After steady-state operation, if T1 is less
than slowly close valve B until T1
climbs to 120°F.
3. If T1 is greater than 120°F, slowly close
until T1 drops to 120°F.
4. Check after system operating temperature
has stabilized. Make final adjustments.
120°F,
valve A
A
B
T1
B
A
T1
CHECK VALVE TEMPERATURE
SENSOR
VALVE PURGE VALVE
THERMOMETER GLOBE VALVE EXPANSION TANK
WITH AIR SCOOP AND
AUTO AIR VENT
PUMP PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS
3-WAY VALVE
CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.