Unit 12
Unit
2
Unit
3
Unit 10
Unit 11
Unit
1
Cold water supply pip
e
(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
Tan
k
Hot water supply points
....
When installing 2 pumps in parallel
Circulation pump
1
Circulation pump
2
(If necessary
)
Remote Controlle
r
System Controller
Pump Control Wires (use external relays)
Remote Controller Cord
Remote Controller Cord
Select the "pump rotation" is active (Refer to page 10 or page 23).
* Size the cold water supply piping to allow for maximum flow rates of the units.
If "Pump error check" is active(Refer to
page12 or page 23),connecting these wiers to system controller
.
NWC-ADAPTER (NA
W-
1 US
)
Example of Recirculation with a Multi-unit System (Recirculation system)
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.
*
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 flow
.
•
Make sure that the flow rate is not greater than 4 ft./sec.
(3/4”: 5 GPM, 1 1/4”: 13 GPM)
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 unit will be reduced.
*
If there are multiple circulation loops, try to make the flow rate .75-1.25 GPM in each loop.
*
Use copper or stainless water piping for the entire system.
─33─