Figure 6, 3 gpm blend pump should be used – Lanair MXB360 User Manual
Page 15
System
Return
Check
Valve
Blend
Pump
System Supply
Pressure Reduction Valve
Backflow Preventer
System Circulator
Amtrol #720
Air Eliminator
or Equal
From City
Water Supply
Expansion
Tank
Air Separator
*
Figure 6
ATTENTION: Heating system design and burner oper-
ation must incorporate interlock to prevent burner
from firing when boiler has no system water flow.
!
*16.3 GPM Blend Pump should be used
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15
Section 8 - Typical Boiler Piping
System Supply
System Return
Pressure Reduction Valve
Backflow Preventer
System Circulator
Amtrol #720
Air Eliminator
or Equal
From City
Water Supply
Expansion
Tank
Air Separator
Check
Valve
Blend
Pump
Check
Valve
Blend
Pump
12”
M
ax.
12”
M
ax.
NOTES:
• Size secondary Pump GPM at gross boiler output
for a 20” drop.
• When calculating pump head, the maximum
boiler resistance for any boiler will not exceed
14” in W.C. of head
Single Boiler Piping with Blend Pump
Figure 6B
Single or Multiple Boiler Piping for Primary/Secondary Pumping