Installation Manual

Demand Duo™ R-Series Installation and Operation Manual 31
The system controller maintains communication
between the tank and tankless via the tankless
communication cable to effectively control the
tank temperature based on the selected
temperature on the tankless unit.
The system controller will energize (120V) the
pump when the tank temperature drops. When
the tank temperature returns to the selected set
temperature, the system controller will
de-energize the pump and remain in standby until
the tank temperature drops again.
When power is
supplied, the system
controller will maintain pump operation. If system
is not in use for an extended period of time,
disconnect power from the system.
ATTENTION
On the SW1 DIP switch (tan switches), set
switches 2 and 3 to the values shown in the table
below for your altitude (Table 5). The default
setting for the appliance is 0-2,000 ft. (0-610 m)
with switches No. 2 and No. 3 in the OFF position
(Figure 28).
When the DIP switch is adjusted, it is not
necessary to adjust the gas pressure setting for
high altitude.
Altitude
SW1
Switch No. 2
SW1
Switch No. 3
0-2,000 ft.
(0-610 m)
OFF OFF
2,001- 5,400 ft.
(610-1,646 m)
OFF ON
Figure 28
Table 5: High Altitude
Water heaters covered in this manual have
been tested and approved for installation
at elevations up to 5,400 ft. Failure to
change the DIP switch settings for high
altitude will result in improper and ineffi-
cient operation of the water heater.
IMPORTANT