INSTALLATION

 

Location

The compact JIC box is provided with flanges, each having two 1/4" mounting holes. Locate the box within about six feet of the sensor, if possible. Avoid locations close to a source of combustibles such as a natural gas fitting that could develop a leak. Wire and pipe the system as shown on the enclosed diagram. If trim gas is added by a motor operated valve, the control interrupt terminals can be used to interrupt power to the motor, if it is not a spring return model. This will hold the additive gas flow constant during burnoff.

 

 

Commissioning

Locate the probe in the generator wall so that the indicated probe temperature is stable between 1400 and 1600oF.

 

With the power switch off, set the burnoff time T1 to 3 minutes,the cycle time T2 to 24 hours and the Delay Timer TR106 to 10 minutes. Close the burnoff flowmeter valve and turn on power switch SW-1. Set reference airflow close to, or above full scale.

 

Adjust burnoff airflow to about 3 cfh and observe the probe millivolt reading.  If it doesn't drop well below 200mv (preferably to zero) before the burnoff time is up, increase the time until it does during a subsequent burnoff cycle.  (To start a new burnoff at any time, turn off the power switch to reset the timer, then turn the power back on.) Observe the time for the observed dew point to return to within 1oF of the set point, and set this value on timer TR106.  Your system is now operational. Values of 24 hours cycle time, 3 minutes burnoff time and 8cfh burnoff flow are typical for this application. When operating at dew points lower than 35oF, it may be desirable to reduce the cycle time to 12 hours or less. If you encounter difficulties, contact SSI for advice and assistance.