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Definitions
NOTE: The defined terms are not active in all
modes of control operation.
% OUT - Current percent modulation rate of heater.
BOIL DSGN - Design boiler water temperature used in
heat loss calculations.
BOIL MASS - This setting allows adjustment in the
field for high or low thermal masses; High thermal
mass (setting=3) provides slower reaction, lower ther-
mal mass (setting=1) provides faster reaction.
BOIL MAX - Highest outlet water temperature that the
control is allowed to use as a target temperature.
BOIL MIN - Lowest outlet water temperature that the
control is allowed to use as a target temperature.
BOIL ON - Accumulated runtime of heater (up to 999
hours, then resets to 0).
BOIL OUT - Actual heater outlet water temperature.
BOIL START - Starting boiler water temperature.
BOIL SUP - Actual system supply water temperature.
BOIL TARGET - Target temperature that the heater is
trying to maintain.
'BURNER' DELAY - Holds control output at ignition
setting from the start of the ignition sequence to the
specified burner delay time (0 to 3:00 min.).
DEM 1 - Indicates 24 VDC signal has been supplied to
the H+D terminal.
DEM 2 - Indicates 24 VDC Flame Proof signal is pres-
ent.
DIFF - The operating differential of the heater; The
heater outlet water temperature is allowed to rise
above the BOIL TARGET temperature by
ferential before the heater shuts off. For example, if
the heater target temperature is set to 160°F (71°C)
and the differential is set to 10°F (5°C), on temperature
rise, the heater will shut off at 165°F (74°C). Once the
heater shuts off, it will not come on again until the tem-
perature falls to 155°F (68°C).
EXTERNAL INPUT SIGNAL – Selects external input
signal range (0-10VDC or 2-10VDC):
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
call for heat. 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
call for heat. 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.
⁄
of this dif-
1
2
TANK - Current DHW tank temperature (Mode 3).
TANK DIFF - Storage tank differential (Mode 3).
TANK TARGET - Target temperature in the DHW
storage tank (Mode 3).
UNITS - Selects the temperature units to be displayed
(°F or °C).
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