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3 Hydronic piping (continued)
Figure 3-9 Multiple Boilers - Multiple Temperatures
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.
NOTICE
CAUTION
Mixing valves are required for the protection of low temperature loops.
CAUTION
Model
Number of Units
2 3 4 5678
Manifold Pipe Sizes in Inches (mm)
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)
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.
EXPANSION
TANK
AIR SEPARATOR
BALL VALVE
(TYPICAL)
UNION (TYPICAL)
PRESSURE
RELIEF
VALVE
FLOW CHECK
VALVE (TYPICAL)
INDIRECT DHW
TANK
BOILER 1
PRESSURE
GAUGE
DRAIN POINT
(TYPICAL)
ANTI-SCALD
MIXING VALVE
DOMESTIC
HOT WATER
CIRCULATOR
MAKE UP WATER
Y-STRAINER
(RECOMMENDED)
TEMPERATURE
LOOP 1
TEMPERATURE
LOOP 2
TEMPERATURE
LOOP 3
BOILER 2
BOILER CIRCULATOR
TEMPERATURE/PRESSURE
GAUGE
COLD WATER IN
WIRES TO
LOOP SENSORS
120VAC
TO PUMPS
24V SIGNAL TO
MIXING VALVES
SHIELDED CABLE
TO BOILER CONTROL
MULTI-TEMP
LOOP CONTROL
(OPTIONAL)
LOOP SENSOR (3X)
BACK FLOW
PREVETER
TO
SYSTEM
FROM
SYSTEM
IMG00394
Outdoor Knight XL Installation & Operation Manual
Please note that these illustrations show an indoor tank to demonstrate piping concept only.
NOTICE