Hurricane SCH25, Руководство по обслуживанию и устранению неисправностей

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mode will timeout in five minutes. After the first three minutes
running, it will automatically purge for the last two minutes.
3.18. Water Pump On (Green)
The green light located directly under the LED digit on the main board
will come on whenever the circulating water pump is energized.
3.19. Test Points
The test points on the electrical control board allow for testing and
troubleshooting of the ITR heater’s electrical system. You will need a
voltage meter to plug into the test points.
Test Point Component Results / Optimal Condition
TP1 Flame
Sensor
A voltage meter should show a voltage of 0 to 4
volts if the flame sensor detects a flame. If not,
the voltage will be 0 volts.
An oscilloscope will show a 0 to 5 volt square
wave with a frequency of 20 Hz to 2000 Hz, if
the flame sensor is detecting a flame.
TP2 Combustion
Fan
The voltage will be between 4 and 5 volts if the
combustion fan is operating correctly; 1 volt if
the combustion fan is not drawing any current
(open).
TP3 Combustion
Fan Current
The voltage will be between 1 and 5 volts if the
combustion fan is drawing normal current, and 0
volts if the combustion fan is not drawing
current.
TP4 5v Power
Supply
The voltage should be between 4.8 and 5 volts.
A lower voltage indicates a problem with the
voltage supply to the logic of the control board.
TP5 8v Power
Supply
The voltage should be between 7.9 and 8 volts.
A lower voltage indicates a problem with the
voltage supply to the logic of the control board.
TP6 Power To
Control
Board
This is the battery voltage supplied to the
control board; it should be between 11 and 15
volts.
TP7 Power To
Flame
Sensor
The power to the flame sensor should read
between 11 and 15 volts (same as battery
voltage).
TP8 Cycling
Aquastat
The voltage will be between 4.8 and 5 volts if
the heater is cycling (cycling aquastat is open),
and 0 if the cycling aquastat is closed.