Installation Guide

62
Water Heater
12
Water Heater
2
Water Heater
1
Hot Water Supply Pipe (1 1/4 in.-5 in.) (Size for max. flow)
Expansion Tank
Hot Water Supply
When installing 2 pumps in parallel
Recirculation Pump 1
Recirculation Pump 2
Remote Controller
System Controller Unit
Pump Control Wires
(Use external relays)
Cold Water Supply Pipe (1 1/4 in.-5 in.) Size the cold water supply piping to allow for maximum flow rates of the Water Heaters.
(If necessary)
(3/4 in.-1 1/4 in.) Hot Water Return Line
This system will make hot water more quickly available to remote fixtures. The pump will circulate water through the loop until the entire loop is warm, and then the system controller unit will turn off the pump until the loop cools down. • Use copper or stainless water piping for the entire system. • Size the pump to provide at least 2 GPM @ 10 ft of head + piping losses through the system. Check the maintenance monitors on the Water Heater to make sure the pump is providing
adequate flow (Refer to the Technical Sheet.).
• Make sure that the flow rate is not greater than 4 ft/sec. (3/4 in. : 5 GPM, 1 1/4 in. : 13 GPM)
NOTE
• If the flow is too low, the recirculation loop temperature will not be warm enough,
if the flow is too high, the lifetime of the Water Heater will be reduced.
• If there are multiple recirculation loops, try to make the flow rate 0.75-1.25 GPM
in each loop.
17.2.2 Example of Installation with a Recirculation System
(Using System Controller Unit)
Installation of the Multi-System