Instructions For Pressure Test Gauge Connection - Space-Ray LTU SERIES Installation And Operation Instructions Manual

17.1)

INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION

SUPPLY PRESSURE
1. The installer will provide a 1/8" N.P.T. plugged tapping, accessible for test gauge connection immediately upstream of
the gas supply connection to the heater.
MANIFOLD PRESSURE
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 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 be adjusted. If full rate adjustment is required, remove the cover
screw. Using a small screwdriver, turn the adjustment screw clockwise
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. Cycle the burner several times. Wait 30 seconds between
cycles to allow the step opening combination gas valve or servo regulator to resume the first step action. Also, observe
the burner operation at full pressure. Repeat after allowing to cool. (Gas pressures are shown in the following table.)
GAS TYPE
Natural Gas
Propane Gas
Minimum permissible gas supply pressure for purpose of input adjustment.
GAS PRESSURE TABLE
MANIFOLD PRESSURE
3.5" W.C.
10.0" W.C.
–32–
to increase or counterclockwise
SUPPLY PRESSURE
Minimum
5" W.C.
11" W.C.
to decrease
Maximum
14" W.C.
14" W.C.
Form #43155260
Mar–05