Space Ray LTU Series Two Stage - Manual (Page 35)

Form #42710010
May 2013
-33-
21.2) REMOVING MAIN BURNER AND GAS VALVE
The main burner can be inspected without removing the burner housing from the heat exchanger tube.
2 1
3
4
5 6
1. Disconnect electrical supply and gas connection at the restrainer nipple.
2. Open the access panel and disconnect the wires from gas valve.
3. Remove the burner clamp and screws.
4. Remove the burner and gas valve assembly from the cabinet.
5. Unscrew the burner from the manifold.
6. Check the orifice. If the gas valve is to be replaced, the pipe joint compounds must be resistant to the action
of liquefied petroleum gases.
21.3) AIR SWITCH PRESSURE CHECK
Plastic Vacuum
Air Tube 0.16” WC
+ -
Connector
Tee
Digital or Inclined
Water Manometer
scale 0-2”w.c.
Temporary 1/4” ID Silicone /
plastic tubing for pressure
test.
Control Box
Air sensing
tube bracket
1. Open hinged access panel.
2. Add tubing to connect the air switch with the connector tee and the existing tubing.
3. Connect plastic tubing of a digital or inclined water manometer with a 0-2” scale onto the connector tees.
4. Turn heater on and wait until blower motor is activated.
5. Observe air pressure from manometer. This should be higher than the set point 0.16” w.c. for correct
operation.
All pressures are with the heater i All pressures are with the heater i All pressures are with the heater i All pressures are with the heater in operation for at least 15 minutes. n operation for at least 15 minutes. n operation for at least 15 minutes. n operation for at least 15 minutes.