Installation Sheet

26 Page
Installaon
Installaon Manual
Pump Control Modes
A) Recirculation Control
ON
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B) Storage Tank
Circulation Control
ON
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C) Energy Conserving
Recirculation
ON
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D) Normal Control
Recirculation (DEFAULT)
ON
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TWO UNIT PRIORITY
Both combustion sections will activate with demand when the two unit priority DIP switch is set to ON. The
minimum activation flow rate requirement will increase from 0.5 gpm (1.9 L/M) to 1.0 gpm (3.8 L/M) in this
mode. This mode is useful for applications requiring high demands. Adjust the following DIP switch on
the upper bank on the center computer board after disconnecting power-supply. Refer to the Warning
above and the DIP switch location diagram above.
Combustion priority
Two unit priority
ON
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Standard operating
mode
(DEFAULT)
ON
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B) Storage Tank Circulaon Control: DIP SW No. 5 ON
The 910 will heat the water 5.4 °F (3 °C) higher than its set temperature unless it is set at 185°F (85°C).
This is to ensure a higher rate of recovery for storage tank applications. The circulation pump (from
storage tank to 910) will always remain running.
C) Energy Conserving Recirculaon: DIP SW No. 4 and No. 5 ON
This pump control mode is similar to the Recirculation Control mode. It will run the pump for one minute,
monitoring the water temperature. The pump will stop if the water in the circulation line has not cooled
below 95 °F (35 °C). The heater will repeat this process 20 minutes later. The pump will continue to run if
the water has cooled below 95 °F (35 °C) until the line has reheated. If the outlet thermistor detects the
water temperature has cooled below 95 °F (35 °C) during the standby period, it will activate the pump to
reheat the circulation loop. If operating the pump in this mode, insulation is recommended on the water
piping.
D) Normal Control (Default seng): DIP SW No. 4 and No. 5 OFF
The pump runs continuously and will not provide pump control. This will reduce the heater's warranty
unless the pump is controlled by an aqua stat. Refer to your product warranty for details.
Upper bank of DIP switches
on the center computer board
WARNING
• Adjust the appropriate DIP switches as shown below. DO NOT adjust the
other DIP switches.
• Turn off the power supply to the water heater before changing the DIP
switch settings.
• Failure to observe these warnings could lead to carbon monoxide poisoning
or death.