Raypak 751 Connecting the Condensing Heat Exchanger CHX, Cleaning Boiler Heating Surfaces, Daily

3.Visually inspect venting system for proper func- tion, deterioration or leakage.

4.Check that boiler area is free from combustible materials, gasoline, and other flammable vapors and liquids.

5.Check for and remove any obstruction to the flow of combustion or ventilation air to boiler.

6.Follow pre-start-up check in Section N.

7.Visually inspect burner flame. Should see light blue flame, with some orange at flame edge.

8.Check operation of safety devices. Refer to manu- facturer’s instructions.

9.Follow oil-lubricating instructions on circulator. Over-oiling will damage circulator. Water-lubricat- ed circulators do not need oiling.

10.Visually inspect condensate drain piping for prop- er operation or deterioration (if appropriate). Check for plugged condensate trap. Use clean-out plug to clear trap.

11.To avoid potential of severe burn, DO NOT REST HANDS ON OR GRASP PIPES. Use a light touch - return piping will heat up quickly.

12.If mixing valve does not seem to be working, the spring and thermostat may need to be replaced. Call a qualified service technician.

13.Check for piping leaks around circulators, mixing valves, relief valves and other fittings. Repair, if found. DO NOT use petroleum based stop leak.

Daily:

1.Check that boiler area is free from combustible materials, gasoline, and other flammable vapors and liquids.

2.Check for and remove any obstruction to the flow of combustion or ventilation air to boiler.

Monthly:

1.Check for piping leaks around circulators, mixing valves, relief valves, and other fittings. If found, repair at once. DO NOT use petroleum-based stop leak compounds.

2.Visually inspect burner flame.

3.Visually inspect venting system for proper func- tion, deterioration or leakage.

4.Check air vents for leakage.

5.Check the hose fitting/orifice on the blower. Make certain that orifice is not blocked by grease, dirt or any other debris. If necessary, use a thin wire to clean up the orifice.

Periodically:

1.Check relief valve. Refer to manufacturer’s instructions on valve.

2.Test low water cutoff, if used. Refer to manufactur- er’s instructions.

3.Visually inspect condensate drain hose for proper operation or deterioration (if appropriate). Check for plugged condensate trap. Use cleanout plug to clear trap.

4.Clean screen in vent termination and air intake.

Cleaning Boiler Heating Surfaces:

The following service procedures must be performed ONLY by a qualified service agency. Boiler owner should not attempt these procedures:

1.If you find soot in top of vent elbow (some sedi- ment in bottom of vent is normal) - remove vent attachment to the ADB and clean flue exhaust baf- fle inside the boiler. Also check burner, replace if damaged.

2.If you find rust deposits in vent elbow - check for high water flow rate or low inlet water tempera- tures. Clean boiler as above.

CONNECTING THE CONDENSING HEAT EXCHANGER (CHX)

NOTE: Connect the vent before connecting the water piping. Install unions on water inlet and outlet of CHX for ease of maintenance. The CHX requires cleaning as often as once a year.

Refer to Fig. 39 for the following steps:

1.Remove the shroud.

2.Remove the top cover.

3.Secure the 15° elbows (supplied) as shown one on each side of the CHX, using the stainless steel screws (supplied).

4.Seal the connection with high temperature RTV (supplied).

5.Replace the top cover.

6.Level the CHX with the ADB by adjusting the lev- eling screws at the base.

7.Place a line of RTV on the crimped end of the flue outlet from the ADB and slide the CHX to join the ADB flue outlet to the CHX flue inlet.

8.Connect the CHX water as specified in the piping diagram. Check for water leak.

9.Secure the flue connection from step 7 above with the stainless steel screws (supplied).

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