24
G
(1 1/4"-2")
(1 1/4"-2")
Unit 6
Unit 2
Unit 1
System Controller
Gas Pipe
Cold Water Supply Pipe
Remote Controller
Hot Water
Supply Pipe
15.
Multi-System
A. Installation without a recirculation system (Standard System)
• Insulate or apply heating materials to both the cold water supply piping and the hot water supply
piping to prevent freezing during cold weather and to prevent heat loss through the piping.
Install one system controller
(SC-301-6M(-EXT)) for every six units.
Dipswitch Settings (for remote controllers RC-7647M or RC-7650M when used with system controller
SC-201-6M)
Note: When this water heater is used with remote controllers RC-7646M-2, RC-7649M, or
RC-9018M, it is not necessary to follow this procedure.
When using the remote controller RC-7647M or RC-7650M (ºC temperature display), a dipswitch change will
be necessary on all water heaters connected to the system controller. Refer to the below instructions to make
the adjustment. A remote controller will need to be connected to the water heater being adjusted.
(1) Turn the water heater off by pressing the Power On/Off Button on the remote controller.
(2) Disconnect electrical power to the water heater, then reconnect electrical power to the water
heater and wait 10 seconds before proceeding to step 3.
(3) Within the first ten minutes of connecting electrical power, before turning on the Power On/Off
Button, press the [▲] or [▼] button on the remote controller and hold until the display blinks
"99". If "99" does not blink on the remote controller, unplug the water heater and try again.
(4) Use the [▲] or [▼] button on the remote controller to scroll to the appropriate dipswitch number
as indicated below.
(5) Press the "FLOW METER ALARM SET" button for 0.5 sec to change the setting ON/OFF:
ON: "priority" lamp flashes.
OFF: "priority" lamp goes off.
(6) Change "2F" from OFF to ON.
* Do not adjust any other dipswitches!
(7) When the dipswitch has been set correctly, confirm the setting by pressing and holding both the
[▲] and [▼] buttons on the remote controller until the controller emits a beeping noise. The new
setting will be lost if this is not done.
(8) Repeat this entire procedure for every unit that will be connected to the system controller.
* When using RC-9018M to change DIP switch, Step 5 - 7 procedures are as follows.
(5) Press the ENTER button, "Item number" stops blinking and "Data state (OFF or ON)" will start
blink. Use the [▲] or [▼] button on the remote controller to change OFF ←→ ON.
(6) Change "2F" from OFF to ON.
* Do not adjust any other dipswitches!
(7) When the dipswitch has been set correctly, press the ENTER button, "Data state (ON)" stops
blinking and "Item number" will start blink. Confirm the setting by pressing and holding both the
[▲] and [▼] buttons on the remote controller until the controller emits a beeping noise. The new
setting will be lost if this is not done.
