34
Installation Manual
Unit 12
Unit 2
Unit 3
Unit 10
Unit 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
Remote Controller
System Controller Unit
Pump Control Wires
(use external relays)
Set “Yes” for the question
“Start pump rotation?” in system settings.
(See SCU-401-12M Installation Manual)
*
Size the cold water supply piping to
allow for maximum flow rates
of the units.
B-1. Example of Recirculation with a Multi-System (Using external system controller)
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 pr
ovide at least 8 L/min @ 3 m of head + piping losses thr
ough the system. Check
the maintenance monitors on the unit to make sur
e the pump is pr
oviding adequate flow
.
•
Make sur
e that the flow rate is not gr
eater than 1.2 m/sec.
(3/4”: 20 L/min, 1 1/4”: 50 L/min)
If the flow is too low
, the r
ecir
culation loop temperatur
e will not be warm enough, if the flow is too
high, the lifetime of the unit will be r
educed.
*
If ther
e ar
e multiple cir
culation loops, try to make the flow rate .3-5 L/min in each loop.
*
Use copper or stainless water piping for the entir
e system.
(Recirculation system)
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