Installation & Operation Manual
6 Hydronic piping (continued)
Figure 6-9 Multiple Boilers - Multiple Temperatures
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Model | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
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400 | 2 1/2 (64) | 3 (76) | 3 1/2 (89) | 4 (102) | 4 (102) | 5 (127) | 6 (152) |
501 | 3 (76) | 3 1/2 (89) | 4 (102) | 5 (127) | 5 (127) | 6 (152) | 6 (152) |
601 | 3 1/2 (89) | 4 (102) | 5 (127) | 5 (127) | 6 (152) | 6 (152) | 8 (203) |
701 | 3 1/2 (89) | 5 (127) | 5 (127) | 6 (152) | 6 (152) | 8 (203) | 8 (203) |
801 | 4 (102) | 5 (127) | 5 (127) | 6 (152) | 8 (203) | 8 (203) | 8 (203) |
TEMPERATURE
TEMPERATURE LOOP 3
LOOP 2
TEMPERATURE
LOOP 1
AIR SEPARATOR
MAKE UP WATER
PRESSURE |
GAUGE |
BALL VALVE (TYPICAL)
BACK FLOW
PREVENTER
PRESSURE 
REDUCING
VALVE
DRAIN POINT | PRESSURE | |
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RELIEF | ||
EXPANSION | VALVE | |
TANK |
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INDIRECT DHW |
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TANK |
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HOT WATER OUT |
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F |
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FLOW CHECK
VALVE (TYPICAL)
BOILER CIRCULATOR
DRAIN |
COLD WATER IN
UNION (TYPICAL)
DOMESTIC
HOT WATER
CIRCULATOR
TEMPERATURE / |
| BOILER 2 |
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PRESSURE GAUGE
BOILER 1
CAUTION
CAUTION
NOTICE
Indirect water heaters are capable of transferring a limited number of Btu’s into the water. Ensure boiler output does not not exceed indirect water heater transfer capabilities.
Mixing valves are required for the protection of low temperature loops.
Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.
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