Raypak 751 manual Post START-UP Check, Main Burner Adjustment, Safety Inspection, Follow-up

NOTE: Emissions will vary with different applications (hydronic, water heater, or pool), venting (including direct vent), ambient conditions (T, P, and humidity), and the condition of the boiler.

NOTE: For high altitude (above 5000 ft), call the factory for proper pressure settings.

Main Burner Adjustment

1.Turn on the unit; about 45 seconds later, the pilot should light. If the pilot fails to light, repeat pilot adjustment.

2.Turn the top manual valve on, Location (2). The inner burner will fire.

3.Make sure that the supply gas manometer reads between 7 – 14 in. WC (dynamic pressure).

4.Check manifold pressure, Location (2); this should read to within ± 0.1 in. WC of the values shown in tables U and V.

5.If adjustment is required, remove screw cap off the top gas pressure regulator, and adjust regulator.

6.Slowly turn the bottom manual valve on, Location

(3). The outer burner will fire.

7.Make sure that the supply gas manometer reads between 7 – 14 in. WC (dynamic pressure).

8.Check manifold pressure, Location (3); this should read to within ± 0.1 in. WC of the values shown in tables U and V.

9.If adjustment is required, remove screw cap off the bottom gas pressure regulator, and adjust regula- tor.

10.The blower pressure should increase about 3/10 in. (0.3 in.) WC equaling the “Firing” value in tables U and V.

11.Lock the blower shutter by tightening the shutter nut while holding the black knob fixed.

12.Allow minimum 5 minutes of run time; then attach flue analyzer, check emission and compare the CO2 reading to that of table U and V.

13.If CO2 is high, reduce bottom manifold gas pres- sure.

14.If CO2 is low, increase the bottom manifold gas pressure.

15.All pressure readings especially manifold pres- sures should be within ±0.1 in. of listed values.

16.Replace the screw caps back on the gas regula- tors.

Your ADB is tuned in!

Safety Inspection

·Check thermostat and high limit settings.

·Attach thermometers to IN/OUT piping and take

temperature measurement, see Table E and G for correct flow balance.

·During the following safety checks leave manome- ters, and analyzer hooked up, check and record.

·If other gas fired equipment in the room and on same gas main, check gas pressures on ADB with them running.

Remember, supply gas should always be between 7 in. and 14 in. WC.

·Check thermostat control for ON/OFF operation;

·Check safety Hi Limits for ON/OFF operation;

·While in operation inspect flow switch;

·Check the low gas pressure switch, it is factory set at 6 in. WC for natural gas;

·High gas pressure switch (optional) at 1 in. WC above manifold pressure;

·Insert ignition control lockout test as safety check

Follow-up

•Safety checks must be recorded as performed;

•Turn unit on;

•After main burner ignition. Check Manometers for proper readings;

•Verify that the blower shutter is locked;

•Cycle unit several times and recheck readings;

•Re-analyze with unit running record or print results;

•Turn unit off, remove all Manometers and replace blower switch hose, replace all gas pressure caps and plugs;

•Check for gas leak one more time;

•Check around unit for debris and remove com- bustible and flammable products, i.e. paper, gasoline etc.

POST START-UP CHECK

Check off steps as completed:

1.Boiler and heat distribution units or storage tank filled with water?

2.Automatic air vent, if used, open two full turns dur- ing venting procedure?

3.Air purged from system?

4.Air purged from gas piping? Piping checked for leaks?

5.Followed start-up procedure for proper start-up?

6.Is burner flame visible?

7.Test safety controls: If boiler is equipped with a low water cutoff or additional safety controls, test for operation as outlined by manufacturer. Burner should be operating and should go off when con- trols are tested. When safety devices are restored,

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