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6 Hydronic piping (continued)
EXPANSION
TANK
AIR SEPARATOR
PRESSURE
REDUCING
VALVE
BACK FLOW
PREVENTER
BALL VALVE
(TYPICAL)
UNION (TYPICAL)
PRESSURE
RELIEF
VALVE
FLOW CHECK
VALVE (TYPICAL)
INDIRECT DHW
TANK
BOILER 1
TEMPERATURE /
PRESSURE GAUGE
PRESSURE
GAUGE
DRAIN
DRAIN POINT
(TYPICAL)
BOILER CIRCULATOR
COLD WATER IN
ANTI-SCALD
MIXING VALVE
DOMESTIC
HOT WATER
CIRCULATOR
HOT WATER OUT
MAKE UP WATER
Y-STRAINER
(RECOMMENDED)
TEMPERATURE
LOOP 1
TEMPERATURE
LOOP 2
TEMPERATURE
LOOP 3
BOILER 2
T
O
S
Y
S
T
E
M
F
R
O
M
S
Y
S
T
E
M
Figure 6-9 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
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.
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)
Installation & Operation Manual