35
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) (refer to Table O). If a volt-
age 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) (refer to Table P). If a volt-
age 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
Water Heater (WH1)
Item Modes Default Setting Range
Boil Target
2 140°F OFF, 70 to 190°F
3, 7 160°F OFF, 70 to 190°F
B
oil Max
2
, 3, 6, 7
1
80°F
O
FF, 120 to 190°F
Boil Min 2, 3, 7 135°F OFF, 80 to 180°F
‘Burner’ Delay All 0:00 min 0:00 to 3:00 min
Boil Mass All 1 (Low) 1 (Low), 2 (Med), 3 (High)
Diff 2, 3, 7 Auto Auto, 2 to 42°F
DHW Target 3 120°F OFF, 70 to 190°F
DHW Diff 3 5°F 2 to 10°F
‘Pump’ Dly All 3:00 min OFF, 0:20 to 9:55 min, ON
Units All °F °F or °C
Mode N/A 3 2, 3, 7
External Input Signal 7 2 to 10 VDC 2 to 10 VDC or 0 to 10 VDC
Offset 7 0°F -10°F to 10°F
Table S: Modulating Temperature Control Default Setpoints—Water Heater
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
storage tank (Mode 3).
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