Girard Products GSWH-1 Service Manual page 24

Gas Modulator System Specifications and Testing
Differentiate between the 1K and 2.2K systems by the color of the wires at the gas modulator
valve. Orange and black wires identify the system as a 1K system. White and black wires identify
the system as a 2.2 K system.
1. Verify that the two terminals of the temperature Adjustment dial are connected
The black wire will connect to chassis ground
• The white wire will connect to white wire of the gas modulator control board.
2. Move the temperature adjustment dial to high position and verify (with a voltmeter)
the voltage on the coil of the gas modulator valve.
• The voltage on the coil of a 2.2 K system will be approximately 3.0~3.2 volts
• The voltage on the coil of a 1 K system will be approximately 3.0~3.2 volts
3. Move the temperature adjustment dial to low position and verify (with a voltmeter)
the voltage on the coil of the gas modulator valve.
• The voltage on the coil of a 2.2 K system will be approximately 9.4~9.6 volts
• The voltage on the coil of a 1 K system will be approximately 8.5~8.7 volts
4. With an Ohms Meter verify the correct value of the temperature adjustment dial.
• The resistance of the 2.2K temperature adjustment dial in the High Position is
approximately 500 ohms.
• The resistance of the 2.2K temperature adjustment dial in the Low Position is
approximately 2.7K ohms.
• The resistance of the 1K temperature adjustment dial in the high position will give you 0
ohms.
• The resistance of the 1K temperature adjustment dial in the low position will give you 1K
ohms.
5. Verify if the Coil of the GM is in good conditions. Measure the value with an ohms
meter; you will get 40 to 50 ohms.
6. Confirm the white wire to the temperature adj. dial has not been grounded. Confirm
the black wire from the temperature adj. dial is grounded.
Testing of the 2.2 K Ohm Temperature
Approximately 500
Ohms on High
Approximately 2.7 K
Ohms on Low
Testing of the 1 K Ohm Temperature Dial
Approximately 0
Ohms on High
Approximately 1 K
Ohms on Low
P a g e 24