temco-tool 36tdvn User Manual

27

   

Defective thermo-generator.   

After the pilot has been lit for approximately three minutes,  

   

(Millivolt system) 

and only the thermo-generator wire connected to the main  

   

 

operator head, measure the voltage across TPTH and TP.   

   

 

This open circuit voltage should be between 500mv and    

   

 

750mv. Tune the pilot adjustment screw until the mv reading  

   

 

falls within these parameters. (Counter-clockwise increases  

   

 

mv reading, clockwise decreases)

   

Defective safety magnet. 

Verify operation of safety magnet in the following   

   

(mv Plus systems) 

manner. 

 

 

 

 

 

 

   

 

(A)  Depress and hold pilot button. 

 

 

 

   

 

(B)  Verify open-circuit thermocouple voltage as de 

 

   

 

 

scribed in previous step.   

 

 

 

   

 

(C)  Reconnect thermocouple to valve.   

 

 

   

 

(D)  Measure the Millivoltage between the solder button    

   

 

on the base of the safety magnet, and the valve    

 

   

 

body.  If the mv reading is above 6mv for vented    

 

   

 

appliances, or 8.5 mv for un-vented appliances, and  

 

   

 

the safety magnet does not hold, replace the valve.  

 

   

 

(E)  If closed circuit mv reading is the same as the open    

   

 

circuit reading, the coil is electrically open.  Replace  

 

   

 

the valve.

   

Defective Safety Magnet  

Verify operation of safety magnet in the following   

 

   

(Millivolt system) 

manner. 

 

 

 

 

 

 

   

 

(A)  Remove all wires from the terminals of the main  

 

   

 

 

operator.  

 

 

 

 

 

   

 

(B)  Measure the electrical voltage between the termi 

 

   

 

nals TPTH and TP. If the voltage is above 110mv   

 

   

 

and the safety magnet does not hold, replace the   

 

   

 

valve.

   

Pilot orifice blocked. 

Replace orifice with a new orifice of the exact size and  

 

   

 

type.

  Pilot drops out. 

Wrong pilot orifice. 

Replace the orifice with a new orifice supplied specifi 

 

   

 

cally for the appliance and gas type in question.

  No gas to main burner 

Low gas pressure to appliance. 

With the main burner functioning, adjust the inlet pres 

 

   

 

sure regulator to supply gas to the appliance within the  

 

   

 

design parameters of the appliance manufacturer.   

 

   

 

(Typically 7”NG, 11”LPG).

   

Pilot not lit. 

Light pilot and wait for thermo-generator to heat up  

 

   

 

sufficiently to power the main operator.  If pilot fails to  

 

   

 

light, or hold, refer to above sections.

   

Control knob not in ON  

Rotate OFF/PILOT/ON control knob to the ON position. 

 

   

 

position.

  Thermostat/wall switch  

Thermostat not in ON position. 

Turn thermostat ON, and adjust temperature control to  

 

  will not cycle main  

 

call for heat.   

 

 

 

 

 

  burner.