Laars Pennant PNCH Installation And Operation Instructions Manual page 15

Pennant
( 500-2000 )
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 4. Hydronic Piping — Multiple Boilers, Primary Secondary System.
toxic, heating system, anti-freeze may be added to the
hydronic system provided that the concentration does
not exceed 50% and the anti freeze contains an anti
foamant. When a 50/50 mixture is used, increase the
water flow requirements by 15%, and increase the
headloss requirements by 20%.
Power outage, interruption of gas supply, failure
of system components, activation of safety devices,
etc., may prevent a boiler from firing. Any time a
boiler is subjected to freezing conditions, and the
boiler is not able to fire, and/or the water is not able to
circulate, there is a risk of freezing in the boiler or in
the pipes in the system. When water freezes, it
expands. This can result in bursting of pipes in the
system, or damage to the boiler, which could result in
leaking or flooding conditions.
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
EXPANSION TANK
WITH AIR SCOOP AND DIMENSION "C" (COMMON PIPING) TO BE FOUR
AUTO AIR VENT
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
3-WAY VALVE
DOTTED DEVICES INDICATE ALTERNATE LOCATIONS
VALVE PUT BOILER CONTROL SENSOR IN THE SYSTEM
SUPPLY WHEN USING THIS PIPING STYLE.
MINIMUM BOILER INLET WATER TEMPERATURE
MUST BE AT LEAST 120°F.
PUMP
C
IMPORTANT NOTES: Different glycol products may
provide varying degrees of protection. Glycol products
must be maintained properly in a heating system, or
they may become ineffective. Consult the glycol
specifications, or the glycol manufacturer, for
information about specific products, maintenance of
solutions, and set up according to your particular
conditions.
Page 15
COLD WATER
MAKE-UP
SYSTEM
SYSTEM PUMP
SUPPLY