Lochinvar FTxl 400 Installation & Operation Manual page 46

6
Hydronic piping
Figure 6-9 Multiple Boilers - Primary/Secondary Piping
Indirect water heaters are capable of transferring a limited number of Btu's into the water. Ensure boiler
CAUTION
output does not exceed indirect water heater transfer capabilities.
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
NOTICE
for all equipment and detailing required by local codes.
System fl ow should always remain higher than the required fl ow for the boiler(s) when the boiler(s) is in
NOTICE
operation to prevent short cycling and high limit issues.
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2 3
Model
Manifold Pipe Sizes in Inches (mm)
3 1/2 (89) 4 (102)
400
3 1/2 (89) 4 (102)
500
3 1/2 (89) 4 (102)
600
4 (102) 5 (127)
725
4 (102) 5 (127)
850
Installation & Operation Manual
Number of Units
4 5 6
5 (127) 6 (152) 6 (152) 8 (203) 10 (254)
5 (127) 6 (152) 6 (152) 8 (203) 10 (254)
5 (127) 6 (152) 6 (152) 8 (203) 10 (254)
6 (152) 8 (203) 8 (203) 8 (203) 10 (254)
6 (152) 8 (203) 8 (203) 8 (203) 10 (254)
7 8