Installation Guide

58
(3/4 in.-1 1/4 in.)
Hot
Water
Supply
Recirculation Pump 1 Recirculation Pump 2
(If necessary)
Remote Controller
Pump Control Wires
(use external relays)
When installing 2 pumps in parallel
Gas Pipe
Hot Water Return Line
Hot Water Supply Pipe
Expansion Tank
Cold Water Supply Pipe
Water Heater 6Water Heater 2Water Heater 1
System Controller
(1 1/4 in.-2 in.) (Size for max. flow)
(1 1/4 in.-2 in.) Size the cold water
supply piping to allow for maximum flow r
ates
of the Water Heaters.
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 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.
17.1.2 Example of Installation with a Recirculation System
Installation of the Multi-System