temco-tool dv1000n-p Manuel D’Utilisation

29

NOTE: Before troubleshooting the gas control system, be sure external shut off is in the “ON” position.

WARNING: Before doing any gas control service work, remove glass front!

  Table 1
   

   

NOVA MV Plus 

Minimum Voltage  145mV 

Hold-in Current 

Less than 285mA

   

 

Coil Resistance 

2.25Ω ± 0.5Ω 

Drop-out Current 

Greater than 125mA

   

 

 

 

Coil Resistance 

0.108Ω ± 0.003Ω

  Pilot will not light. 

Air in gas lines. 

Bleed all air from gas lines.

   

Wrong inlet pressure. 

With the main burner functioning, adjust the inlet  

   

 

pressure regulator to supply gas to the appliance  

   

 

within the design parameters of the appliance manu- 

   

 

facturer.  (Typically 7”NG, 11”LPG).

   

Defective spark electrode. 

Replace piezo wire if insulation is cracked or the tip  

   

 

is corroded. 

 

 

 

 

 

   

 

Verify that the spark gap between the pilot and the  

   

 

electrode is correct.

   

Defective piezo wire. 

Replace piezo wire if insulation is damaged, or the  

   

 

wire is broken or corroded.

   

Safety interlock function  

Allow thermocouple to cool until the mv drops below  

   

engaged. 

the hold-in requirements of the safety magnet, (30  

   

 

seconds or less).  Re-light pilot.

  Pilot will not hold. 

Wrong inlet pressure.  

With the main burner functioning, adjust   the inlet  

   

 

pressure regulator to supply gas to the appliance 

   

 

within design parameters of the appliance manufac 

   

 

turer. (Typically 7”NG, 11”LPG)

   

Pilot adjustment screw not  

After the pilot has been lit for approximately three  

   

properly adjusted. 

minutes, and only the thermo-generator wire con- 

   

 

nected to the main operator head, measure the volt- 

   

 

age across TPTH and TP.  This open circuit volt   

   

 

age 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).

   

Thermocouple or  

Make certain that the thermocouple and thermo-  

   

thermo-generator not 

generator are fully inserted and tightened into their 

   

properly inserted into the pilot 

receptacles in the pilot head. The thermocouple   

   

housing 

should be threaded into the valve hand-tight, plus  

   

 

1/4 turn with wrench.

   

Thermocouple or  

With the thermocouple and thermo-generator tips  

   

thermo-generator has film  

cool, clean the upper 3/8” with a very fine emery   

   

build-up on tip. 

cloth.

   

Electrical resistance too high. 

Using a very fine emery cloth, clean thermo-genera- 

   

 

tor and  thermocouple connections at valve. Tighten  

   

 

thermocouple into valve hand-tight, plus 1/4 turn  

   

 

with a wrench.