Raypak 302BD-2342BD FlexGas Operation - Changing Fuels, Safety Inspection, Follow-Up

8.If burner does not light on first trial. It will retry, up to three times.

9.Main burner ignition: Check upper manifold gas pressure.

10.If the pressure readings differ by more than ± 0.1 in. WC, remove screw cover from the gas pres- sure regulator on the FlexGas fuel train and adjust until upper manifold pressure is nominally 2.2 ± 0.1 in. WC (manifold pressure 1.3 ± 0.1 in. WC). If a flue gas analyzer is used, the CO2 on propane

should be 9.0-10.0% and CO should be less than 150 ppm.

CAUTION: Once the natural gas pressures are established, DO NOT adjust the Hi Delta gas valves to attain the required propane pressures. Adjustments must be made to the FlexGas propane regulator.

11. Replace the screw cover.

CAUTION: Special manifold and air settings may be required. Verify rating plate and blower housing.

12.Turn the gas selector key on the FlexGas control panel to “OFF”.

13.Close the manual valve on the propane gas supply and open the manual valve on the natural gas supply. Turn the gas selector key on the FlexGas control clockwise to “NAT”. The heater is now ready for operation.

FlexGas Operation - Changing Fuels

From NAT to PRO:

1.Turn the boiler off (power switch on front control panel).

2.Turn FlexGas key to “OFF”.

3.Close NAT manual valve.

4.Open PRO manual valve.

5.Turn FlexGas key to “PRO”.

6.Turn the boiler on.

NOTE: Reset Low Gas Pressure Switch (when equipped) if necessary. Refer to Fig. 2 for location.

From PRO to NAT:

1.Turn the boiler off (power switch on front control panel).

2.Turn FlexGas key to “OFF”.

3.Close PRO manual valve.

4.Open NAT manual valve.

5.Turn FlexGas key to “NAT”.

6.Turn the boiler on.

Safety Inspection

1.Check all thermostats and high limit settings.

2.During the following safety checks leave ma- nometers hooked up, check and record.0

3.If other gas-fired appliances in the room are on the same gas main, check all pressures on the Hi Delta with all other equipment running.

4.Check thermostats for ON-OFF operation.

5.Check high limits for ON-OFF operation.

6.While in operation, check flow switch operation.

7.Check the low gas pressure switch. (For proper adjustment, use the attached manometers, if available, to set pressure. The scales on the switch are approximate only.) Low gas pressure switch (if equipped) must be set at 5.0 in. WC for natural gas.

Follow-Up

Safety checks must be recorded as performed.

Turn heater on. After main burner ignition:

1.Check manometer for proper reading.

2.Cycle heater several times and re-check readings.

3.Turn unit off.

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