43
100KOhm sensors are used for water temperature
measurement. These sensors are dual thermistors
in a single sensor housing. The control uses both
sensor readings in operating the unit. If the control
measures temperatures on these thermistors which are
approximately 3°F (1.6°C) apart, the control will shut off
the compressor and show “In Sensor Fault”.
The message will be cleared and operation resume when
thermistors are within 2°F (1.1°C) of each other. The sensor
has a measurement error of less than +/- 0.5°F (0.3°C)
between 36°F and 110°F (2.2°C and 43°C) temperatures.
The control displays 100K sensor temperatures to 0.1°F
or 0.1°C resolution. The water temperature used for
thermostat decisions is the average of the 2 thermistors.
Table F. Temperature-Resistance Sensor Values
Temperature ºF (ºC) Resistance (Ω)
32 (0) 32550
41 (5) 25340
50 (10) 19870
59 (15) 15700
68 (20) 12490
77 (25) 10000
86 (30) 8059
95 (35) 6535
104 (40) 5330
113 (45) 4372
122 (50) 3605
Temperature ºF (ºC) Resistance (Ω)
32 (0) 325500
41 (5) 253950
50 (10) 199040
59 (15) 157150
68 (20) 129440
77 (25) 100000
86 (30) 80570
95 (35) 65310
104 (40) 53260
113 (45) 43680
122 (50) 36020
Water Outlet, Ambient, Coil and solar sensors
10K Sensor Resistance Values
Inlet Water Sensor
100K Sensor Resistance Values
24. RESISTANCE SENSOR VALUES
10KOhm sensors are used for the Outlet water
temperature, Ambient Air Temperature sensor, the Coil
Temperature sensor. Additionally, the control board Solar
sensor terminal is designed for a 10KOhm Temperature
sensor (eld-supplied when necessary). The sensor
has a measurement error of less than +/- 0.5°F (0.3°C)
between 36°F and 110°F (2.2°C and 43°C) temperatures.
The control displays 10K sensor temperatures to 0.1°F or
0.1°C resolution.
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