48
100K sensors are used for water temperature
measurement. These sensors are dual thermistors
in a single sensor housing. The control uses both
sensor reading in operating the unit. If the control
measures temperatures on these thermistors which
are approx. 3
°
F (1.6
°
C) apart, the control will shut off
the compressor and show “H2O Sensor Fail”.
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.
10K sensors are used for the Ambient Air Temperature
sensor, the Coil Temperature sensor and Aux Heat
Temperature sensor (field 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.
Table I: 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)
-----
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
Other Sensors
10K Sensor Resistance Values
Water Sensor
100K Sensor Resistance Values
Resistance Sensor Values
Summary of Contents for 2450 Series
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