25
System Controller
Remote Controller
G
(1 1/4"-2")
(3/4"-1 1/4")
Hot
Wa
ter
Supply
Circulation Pump
1
Circulation Pump
2
(If Necessary)
Pump Control Wires
(for pumps > 85
W,
use an external relay
)
When installing 2 pumps in parallel
*
Set “Yes” for the question
“
Start pump rotation
?”
in system settings.
(See SC-301-6M Installation Manual)
Gas Pipe
Hot
Wa
ter Return Line
*
Size the cold water supply piping to
allow for maximum flow rates of the units.
Hot
Wa
ter
Supply Pipe
(1 1/4"-2")
Expansion Tank
Cold
Wa
ter Supply Pipe
Unit
6
Unit
2
Unit
1
B-1. Example of Recirculation with a Multi-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.
