INSTALLATION

 

Location

 

The compact JIC box is provided with flanges, each having two 1/4" mounting holes. Locate the box within about 6 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 in Fig. 1.  The controller will hold the additive gas flow constant during burnoff and purge/delay periods.

 

Commissioning

 

Locate the reheat well and probe in the generator wall so that the indicated probe temperature is stable between 1450 and 1650oF.

 

With the power switch on, set the reference airflow rate close to full scale (2cfh).

 

Initiate a burnoff routine in the control instrument with a nominal burnoff time of 3 minutes. Adjust the burnoff airflow rate to 3cfh and observe the probe millivolt reading.  If it doesn't drop well below 200mv (preferably to zero) before the burnoff is complete, increase the flow rate or the time until it does. Your system is now operational.

 

Values of 24 hours cycle time, 3 minutes burnoff time and 3cfh 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.