Instructions For Pressure Test Gauge Connection - Space-Ray LTU80-N5 Installation And Operation Instructions Manual

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INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION

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 test 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
increase or counterclockwise
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 TYPE
Natural Gas
Propane Gas
* Minimum permissible gas supply pressure for purpose of input adjustment.
7" W.C. for LTS/U 150-250
1
12" W.C. for LTS/U 180-250
2
to decrease the gas pressure to the burner. Replace the cover screw. NOTE:
GAS PRESSURE TABLE
MANIFOLD PRESSURE
3.5" W.C.
10.0" W.C.
-32-
SUPPLY PRESSURE
Minimum*
5" W.C.
1
11" W.C.
2
to
Maximum
14" W.C.
14" W.C.
Form #43155010
Mar 09