Specifications

54
LP- 276 REV. 9.4.14
pressing on top of the plastic cover over the red reset button. You will note that the yellow LED has gone out. Press and hold the {S4}
key on the control panel for 4 seconds to begin normal operation.
4. If the tank water temperature is below the tank set point temperature (tank differential temperature) the boiler will ignite.
5. If the appliance fails to start, refer to Troubleshooting, Part 11.
B. ADJUSTING THE OPERATING SET POINTS OF THE VWH DISPLAY
To adjust the temperature set point, differential values, and display units of the VWH boiler, press the {S3/Program} key for three
seconds until you see {Sh} and an alternating value of 7
o
F. Use the {S1/-} key or {S2/+} key on the display to either increase or
decrease the setting of each parameter. Use {S3} to advance to each parameter listed in the chart below. Pressing {S3} when you are
at the last parameter on the chart will return the display to normal operation. If you missed a parameter or want to make further
changes, simply press and hold {S3} for 3 seconds to reenter the programming mode.
SET POINT ADJUSTMENT
Function
Display
Default Setting
Range of Adjustment
Supply Sensor Differential
sh
7
o
F
1 – 45
o
F
Temperature Set Point
dd
119
o
F
80
o
F / 185
o
F
Tank Sensor Differential
dh
7
o
F
1 – 45
o
F
Measurement Units
t
Fahrenheit to Celsius
F or C
Table 14 – Set Point Adjustment
Settings when using a Tank or Pipe Sensor
Parameter {t} should be set to F for Fahrenheit temperatures or C for Celsius
temperatures.
Parameter {dd} should be set to the desired tank temperature. If you are
using 0-10 volt control, parameter {dd} should be set to the tank temperature
corresponding to the 10 volt input signal.
Parameters {sh} and {dh} should both be set to the number of degrees below
the desired tank temperature that you want the VWH boiler(s) to start firing
at.
Settings when using a Mechanical Tank or Pipe Sensor
The mechanical sensor should be set to the desired tank temperature.
Parameter {t} should be set to F for Fahrenheit temperatures or C for Celsius temperatures.
Parameter {dd} should also be set to the desired tank temperature.
Parameter {sh} should be set to the number of degrees below the desired temperature that you want the VWH boiler(s) to begin firing
at. This is useful if you desire a greater differential temperature than is designed in to the mechanical control.
Note: Parameter {dh} is not active when using a mechanical tank or pipe sensor.
C. STATUS MENU
Installers are also able to check the current status of the VWH parameters by pressing {S4/Reset} for 3 seconds. Once activated, the
display will show d1 alternating value of the actual outlet temperature. Actual values are displayed for each function. To view the next
value, simple press {S4}.
Listed below are the values which can be displayed. These values cannot be changed. To exit this menu, press {S3} to resume normal
operation.
Function – Value
To toggle between values press {S1} to go down and {S4} to go up. The first function you will see is:
|d1| — Actual temperature from outlet sensor
|d2| — Actual temperature from inlet sensor
|d3| — If using a standard mechanical control, the control will display 0 for closed and 1 for open. If the tank sensor is connected to a
storage tank, it will measure the actual temperature.