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0-10VDC or 0-20 mA external input signal – When
the 0-10VDC signal is selected, an input voltage of 1
VDC corresponds to a boiler target temperature of
50°F (10°C). An input voltage of 10 VDC corresponds
to a boiler target temperature of 220°F (104°C). As the
voltage varies between 1 VDC and 10 VDC, the boiler
target temperature varies linearly between 50°F
(10°C) and 220°F (104°C). If a voltage below 0.5 VDC
is received, the boiler target temperature is displayed
as “– – –” indicating that there is no longer an internal
heat demand. A 0-20 mA signal can be converted to a
0-10 VDC signal by installing a 500 Ω resistor on the
external input signal device’s terminals.
2-10VDC or 4-20 mA external input signal – When
the 2-10VDC signal is selected, an input voltage of 2
VDC corresponds to a boiler target temperature of
50°F (10°C). An input voltage of 10 VDC corresponds
to a boiler target temperature of 220°F (104°C). As the
voltage varies between 2 VDC and 10 VDC, the boiler
target temperature varies linearly between 50°F
(10°C) and 220°F (104°C). If a voltage below 1.5 VDC
is received, the boiler target temperature is displayed
as “– – –” indicating that there is no longer an internal
heat demand. A 4-20 mA signal can be converted to a
2-10 VDC signal by installing a 500 Ω resistor on the
external input signal device’s terminals.
FP - Flame proof warning.
MODE - Operating mode of the heater.
OFFSET - The Offset setting allows the boiler target
temperature to be fine tuned to the external input sig-
nal. The control reads the external input signal and
converts this to a boiler target temperature. The Offset
setting is then added to the boiler target temperature.
OUTDR - Outdoor air temperature.
OUTDR DESIGN - Design outdoor air temperature
used in the heat loss calculation.
OUTDR START - Starting outdoor air temperature.
PUMP DLY - Sets the operating time of the pump once
the CFH is satisfied.
TANK - Current DHW tank temperature (Mode 3).
TANK DIFF - Storage tank differential (Mode 3).
TANK TARGET - Target temperature in the DHW stor-
age tank (Mode 3).
UNITS - Selects the temperature units to be displayed
(°F or °C).
WWSD - Selects the outdoor temperature that shuts
the heater off, no matter what the demand. NOTE: The
WWSD segment is displayed on the LCD.
Rank Item Field Number Field Type Fault Description
0 E01 Err Error EEPROM error
1 FP Err Warning Flame proof warning
2 BOIL OUT SHr Error Boiler outlet sensor short
3 BOIL OUT OPn Error Boiler outlet sensor open
4 BOIL IN SHr Error Boiler inlet sensor short
5 BOIL IN OPn Error Boiler inlet sensor open
6 SUP SHr Error System sensor short
7 SUP OPn Error System sensor open
8 OUTDR SHr Error Outdoor sensor short
9 OUTDR OPn Error Outdoor sensor open
10 DHW SHr Error DHW sensor short
11 DHW OPn Error DHW sensor open
Table R: Error Codes