8
Servicing should only be performed by a Quali
fi
ed Service Technician
GENERAL OPERATION
HOW THE WATER HEATER OPERATES
The XP water heater uses an advanced stainless steel heat exchanger and an electronic control module that
allows fully condensing operation. The blower pulls in gas and air and pushes
fl
ue products out of the water
heater through the heat exchanger and
fl
ue piping. The control module regulates blower speed to control
water heater
fi
ring rate. The gas valve senses the amount of air
fl
owing into the water heater and allows only
the right amount of gas to
fl
ow.
SEQUENCE OF OPERATION
Table 1 shows control module normal sequences of operation for water heating operation.
ACCESS MODES
User
The user can adjust tank target temperatures by accessing the Tank Temperature using the MENU option on
the Touch Screen Display. The date and time can also be changed.
Installer
Most parameters are available only to the installer, accessible by entering the installer password (5309).
SAVING PARAMETERS
Refer to the Parameter Table - Table 4 on Pages 14 and 15 of this Service Handbook.
To save parameters and exit programming:
After setting or changing the parameters touch the ACCEPT option on the Touch Screen Display.
To enter a parameter and continue programming:
Use the +/ - options for setting the required parameters or the Up/ Down arrows on the Touch Screen Display
to access and make appropriate changes. Remember to ACCEPT the changes when
fi
nished programming
in order to save the changes made.
