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Servicing should only be performed by a Quali
fi
ed Service Technician
VIEWABALE AND CHANGEABLE CONTROL PARAMETERS
Before changing parameters, note the settings so that the unit can be returned to its original operating
parameters.
TEMPERATURE
Tank Setpoint
By installing a tank sensor, the UIM control can perform the tank thermostat function. The UIM control
automatically detects the presence of this sensor, and generates a DHW call for heat when the tank
temperature drops below the tank setpoint differential (Tank Setpoint Differential parameter), and
fi
nishes the
call for heat when the tank temperature reaches tank set point + offset. This parameter can be changed by
the installer by accessing the Tank Setpoint parameter. The default value is 125°F (52°C).
Differential
When a tank sensor is installed, the tank temperature must drop this amount below the tank setpoint before
the water heater turns back on. The installer can adjust this setting by accessing the Differential parameter.
The minimum setting is 0° (0°C), and the maximum is 40°F (22°C). The default setting is 6°F (3°C). This
parameter can only be changed by the installer by accessing the Differential parameter.
Setpoint Offset
The tank setpoint offset measures how far the actual temperature must go above the setpoint before the call
for heat ends (the water heater will turn off). This parameter can be changed by the installer by accessing the
Setpoint Offset parameter. The temperature range of this parameter is 0°F (0°C) to 10°F (30°C). The default
value is 4°F (6°C).
DISPLAY SETTINGS
Backlight Delay
This is the time in which the display remains illuminated. The range is 30 seconds to 5 minutes. The default
is 3 minutes.
Temperature Units (°C / °F)
The control can be con
fi
gured to display temperature in either °C or °F. This parameter can be changed by
the user or the installer by accessing the Temperature Units parameter. The default is °F.
HEATER INFORMATION
UIM Version
The software version allows the user to view the software version in use by the control. This software controls
the operation of the water heater. When a new software version becomes available, the existing control can
be replaced with a new control to update the software. Software version is read only.
FAULT HISTORY
CLEAR Button
The CLEAR function clears the last 10 errors log.
SERVICE
Service Mode Delay
While in Service Mode, the unit will override all other heat demands. The Service Mode allows the installer
to set the unit to any
fi
ring rate for the purpose of combustion analysis. The delay sets the length of time the
water heater will stay in the Service Mode if no keys have been pressed before going back to its original
state. This parameter can only be changed by the installer by accessing the Service Mode Delay parameter.
The time range of this parameter is 1 to 10 minutes. The default value is 10 minutes.
Service Contact Info - Contact Name & Contact Phone
This can be programmed to access the Contact Name and Contact Phone parameter.
