Installation Manual

Unit 12 Unit 2Unit 3Unit 10Unit 11 Unit 1
Cold water supply pipe (1 1/4” - 5”)
Hot Water Return Line (3/4” - 1 1/4”)
Hot Water Supply Pipe (1 1/4” - 5”) (Size for max. flow)
Expansion
Tank
Hot water supply points
....
When installing 2 pumps in parallel
Circulation pump 1 Circulation pump 2 (If necessary)
Remote Controller
System Controller
Pump Control Wires (use external relays)
Remote Controller Cord
Remote Controller Cord
Set “Yes” for the question “Start pump rotation?” in system settings. (Refer to page 10).
*
Size the cold water supply piping to
allow for maximum flow rates of the units.
Set “Yes” for the question “Pump error check” in the Sys settings when connecting these wires to system controller (Refer to page 12).
NWC-ADAPTER (NAW-1 US)
Example of Recirculation with a Multi-unit System (Recirculation system)
This system will make hot water more quickly available to remote xtures.
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.
* Size the pump to provide at least 2 GPM @ 10 feet of head + piping losses through the system.
Check the maintenance monitors on the unit to make sure the pump is providing adequate ow.
•
Make sure that the ow rate is not greater than 4 ft./sec.
(3/4”: 5 GPM, 1 1/4”: 13 GPM) If the ow is too low, the recirculation loop temperature will not be warm enough, if the ow is too
high, the lifetime of the unit will be reduced.
* If there are multiple circulation loops, try to make the ow rate .75-1.25 GPM in each loop. * Use copper or stainless water piping for the entire system.
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