Gas-Fired Products PTU Series Benutzerhandbuch

 

 Form 

#43343330 

 

–30– 

May 08

 

 
 
 

14.0) 

INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION 

 

SIDE VIEW

43269050 Rev. A   03/08

Failure to do so may result in death,

serious injury or property damage

FIRE HAZARD

This access panel must be closed

tightly with all the necessary screws

during operation.

Never operate the heater with the

access panel open or removed.

Failure to do so may result in death, serious injury or property

damage.

The access doors on either side of the burner must

be securely fastened before operating the heater.

The access panels must be closed tightly with all the necessary

screws during operation.

Never operate the heater with the access panel open or removed.

 

 

SUPPLY PRESSURE 
1.  The installer will provide a 1/8” N.P.T. tapped plug, accessible for test gauge connection immediately upstream 

of the gas supply connection to the heater. 

 
MANIFOLD PRESSURE – COMBINATION GAS VALVE IS FACTORY SET 
1.  Turn the gas valve to the “OFF” position.  Remove the 1/8” plug from the combination gas valve at the outlet 

pressure tap and connect a 1/8” nipple to the tapped hole.  Connect the gauge to the nipple.  Turn on the gas 
supply. 

2.  With the main burner operating, check the burner manifold pressure using a water column manometer.  Gauges 

that measure pressure in pounds per square inch are not accurate enough to measure or set the manifold 
pressure.  All measurements MUST BE made when this heater and all other gas burning equipment that is 
connected to the gas supply system are operating at maximum capacity.   

3.  The combination gas valve is factory set and should not require adjustment.  If full rate adjustment is required, 

remove the cover screw.  Using a small screwdriver, turn the adjustment screw clockwise   to increase or 
counterclockwise   to decrease the gas pressure to the burner.  Replace the cover screw.  NOTE: The step 
opening pressure of this gas valve is not adjustable. 

4.  Check the burner at step pressure, observing burner ignition and flame characteristics.  The burner should ignite 

properly and without flashback to the orifice, and should remain lit.   

 
 

GAS PRESSURE TABLE 

SUPPLY PRESSURE 

GAS TYPE 

MANIFOLD PRESSURE 

  Natural Gas 

  3.5” W.C. 

  5” W.C. 

14” W.C. 

  Propane Gas 

10.0” W.C. 

11” W.C. 

14” W.C. 

 

* Minimum permissible gas supply pressure for purpose of input adjustment.