37
Storage Tank Circulation pump 2
Storage Tank Circulation pump 1
Relief valve
Hot water supply points
Hot water supply line
Hot water return line
Cold water supply pipe *1
When installing 2 pumps in parallel
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 building.
* Be sure to connect the cold water supply pipe
between the hot water storage tank and intake
side of the storage tank circulation pump.
Thermostat
System Controller Unit
Remote
controller
cord
Remote Controller
Pump control
(use external relays)
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
(copper or stainless steel pipe)
Hot water
storage tank
(copper or stainless steel pipe)
Return line circulation pump
(Size for max. flow)
(Size for max. flow)
Storage tank supply line (copper or stainless steel pipe)
Storage tank return line (copper or stainless steel pipe)
B-2. Example of Installation with a Storage Tank and Recirculation System (Using external system controller)
The pump will push water through the Multi-System to heat up the tank.
When the temperature of the thermostat is high, the system controller will turn off the pump until
the temperature cools down.
*
F
or the set temper
ature of the remote controller
, use the temper
ature (of the ther
mostat) + about 5 °C
.
*
T
o
achie
v
e
the highest reco
v
e
ry
, siz
e the stor
age tank circulation pump f
or maxim
um capacity
.
(32ECR6 :
34 L/min (each) @ 12 m of head, 28ENR6 :
26 L/min (each) @ 10 m of head (75 °C setting or less) +
piping losses through the system.)
V
e
rify the supply pressure to the units is at least 200 Kpa.
(Tank recirculation system)
