Water Drain Valve
Gas Inlet
Figure 2. Water Drain Valve
on Condensing Models
90
Figure 1. Flush Set-up
Bucket
Pump
Hose
Hose
Water
Outlet
10.Turn the pump on. The unit will attempt to ignite (make sure that the gas has been turned o)
and a number “11” should ash on the remote controller after about 1 minute. Do not reset the unit.
Allow the solution to circulate for 45 minutes.
Note: It may take a few minutes to clear air out of the heater and hoses.
11.Turn the pump o and close the cold water drain valve of the isolation valve.
12.Remove the hose from the cold water drain valve and
replace cap and washer onto the drain valve outlet.
13.Remove the pump and hose from the bucket and empty
the solution.
14.Put the hot water drain hose end back into the empty
bucket and open the cold water main valve wing handle.
This procedure will ush out the heater with fresh cold water.
Flush for at least 5 minutes or until 20 gallons of water has
passed through the heater.
15.Close the cold water main valve wing handle and clean
the water inlet lter. Place the lter back into the unit.
16.Close the hot water drain valve lever handle, remove the
drain hose and replace cap and washer onto the hot water
drain valve outlet.
17.Open both the hot and cold water main valve
wing handles. Wing handles should now be
(OPEN) parallel to the main valve body and lever
handles should be (CLOSED) perpendicular to
the drain portion of the body, which is the normal
operating position.
18.Open the gas supply valve and reset the unit by
turning the power o and then on again using the
Power Button on the Remote Controller. If no Remote
Controller is installed, disconnect, then reconnect
electrical power to the unit in order to reset the system.
<continued from previous page>
Changing Default Temperature Setting
* The water heater has been factory set to allow a maximum temperature setting of 120°F.
To access higher temperature settings through the remote controller, follow the below steps.
the NR66/N-0531S and NR71/N-0631S can be set to one of three temperatures (140, 130, 120°F) when the
optional remote controller is not connected. To change the default temperature, connect the temperature
selection wire as shown in the below diagram.
Note: If the 160°F connector is being used, the unit will automatically default to a temperature of 120°F
(135°F for the NR50-OD) when the remote controller is not installed.
* The water heater has been factory set to allow a maximum temperature setting of 120°F.
To access higher temperature settings with the optional remote controller installed, follow the below
steps. The unit can only be set to temperatures in the range of 145-160°F when the optional remote
controller is installed.
<NR50-OD, NR66/N-0531S Series, NR71/N-0631S Series>
<continued on next page>
Water
Inlet
Note: For NRC/NCC/841/842 Series condensing models, carefully unscrew
the water drain valve from the bottom of the water heater near
the gas inlet to ush any residual solution from the system (see
Figure 2). The system will be under pressure and the drain
valve will only require a couple of turns to allow sucient
ow from the drain. Place a bucket under the unit and ush
for about 10 seconds. Attempting to remove the drain valve
completely could result in an excessive leak.
t
The NR50-OD can be programmed so that it will default to one of four temperatures (140, 135, 130, 120°F) while
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