Humidifier Heater/Safety Thermostat; Compartment Air Probe And Skin Temperature Probes; Heat Sink Sensor Thermistor - GE Giraffe OmniBed Carestation CS1 Service Manual

5.3.1 Humidifier Heater/Safety Thermostat

The humidifier has two separate heater elements rated at 225 watts at 104 volts. They are connected in
parallel for 115 volt operation and in series for 230 volt operation. The humidifier safety thermostat is in
series with the heater. It opens at 130 +/-5 C and closes at 90 +/-8 C. Measure the resistance at J53.1 to
J53.3.
The resistance of each heater is about 144 ohms so it should measure about 72 ohms for 115 devices, 288
ohms for 230 devices.

5.3.2 Compartment Air Probe and Skin Temperature Probes

Use the Service screen to read the temperature of the compartment and skin temperature probes.
There are two thermistors in each air probe or skin temperature probe. During stable temperature
conditions the thermistors should read the same resistance within a few ohms.
Skin temperature probe #1
Skin temperature probe #2
Compartment Air probe
Temperature (°C)
20
25
30
35
See "Compartment and Skin Probe Characteristics" on page A-1 for complete temperature/resistance
tables.

5.3.3 Heat Sink Sensor Thermistor

Use the Service screen to read the resistance of the heat sink sensor.
Thermistor
Temperature (°C)
20
25
30
35
40
80
90
Service Manual
Chapter 5: Troubleshooting
Control bd J4 pins 1-3, 2-3
Control bd J2 pins 1-3, 2-3
Control bd J1 pins 1-2, 3-4
Resistance (Ohms)
12527
10000
8037
6500
Control bd J3 pins 1-2
Resistance (Ohms)
25000
20000
16102
13048
10636
2506
1827
Switches/Thermostat
5-13