Bradford-White Corp BWCV, BWCH warranty Hydronic Piping Multiple Boilers, Primary Secondary System

COPPER BRUTE II (500 - 2000) Page 15

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SYSTEM PUMP	SYSTEM
	SUPPLY

PUMP LOCATION FOR

NON-PUMP-MOUNTED UNITS

CAUTION: THIS DRAWING SHOWS SUGGESTED
PIPING CONFIGURATION AND VALVING, CHECK	PUMP LOCATION FOR PUMP-MOUNTED UNITS
WITH LOCAL CODES AND ORDINANCES FOR
ADDITIONAL REQUIREMENTS.
	PRIMARY/SECONDARY MANDITORY FOR ALL
	VARIABLE FLOW SYSTEMS
LEGEND	INSTALL AIR VENTS AT HIGH POINTS IN SYSTEM
	PIPING & SIZING OF EXPANSION TANK

THERMOMETER	EXPANSION TANK	PER TANK MANUFACTURER'S INSTRUCTIONS
	WITH AIR SCOOP AND	DIMENSION "C" (COMMON PIPING) TO BE FOUR
	AUTO AIR VENT	PIPE DIAMETERS, MAX. (NO ELBOWS OR VALVES)
TEMPERATURE	PURGE	BOILER CIRCUIT PIPING MUST BE EQUAL
	VALVE
SENSOR		TO BOILER WATER CONNECTION SIZE
GLOBE VALVE	3-WAY VALVE	BOILER CIRC. PUMP SIZED FOR FLOW THROUGH BOILER
		DOTTED DEVICES INDICATE ALTERNATE LOCATIONS

CHECK VALVE	VALVE
PRESSURE REDUCING VALVE
W/ FAST FILL BYPASS	PUMP

PUT BOILER CONTROL SENSOR IN THE SYSTEM SUPPLY WHEN USING THIS PIPING STYLE.

MINIMUM BOILER INLET WATER TEMPERATURE MUST BE AT LEAST 120°F.

Figure 4. Hydronic Piping — Multiple Boilers, Primary Secondary System.

precautions are made for freeze protection. A non 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.

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.