Weil-McLain GL-E223-ADOC 0311 manual Filling the piping

AQUA PLUS indirect-fired water heaters — Product Manual

Connecting to a low-pressure steam boiler (continued)

Figure 16 Low pressure steam boiler application — Domestic water heating using water pumped from steam boiler

Notes

•Locate flow / check valve as close as possible to water heater boiler side connec- tions — to reduce heat loss between cycles.

Use memory stop valve 7 to blend some of the water re- turning to the boiler with the hot water coming from the boiler. This will reduce the possibility of flashing (cavita- tion) in the circulator. Slowly open valve 7 until temperature gauge 8 reads 200°F.

Set the memory stop on valve 7 after adjusting. Attach a tag to the valve warning no to close or change valve position.

NOTE — If the boiler water level should drop below ei- ther the water heater boiler water supply or return line, the filling procedure will have to be repeated.

1.This drawing is conceptual only. It shows representa- tive piping components and layout. Weil-McLain does not represent that this drawing meets any partic- ular mechanical or build- ing codes. The installer is responsible for inclusion of all required safety de- vices, or other miscella- neous piping hardware not shown on drawing. The installer is responsible for proper sizing / selection of all hardware shown on this diagram.

2.See boiler manual for spe- cific details on installing the boiler.

Part number GL-E223-ADOC 0311

Filling the piping

1.Parts of the boiler water piping to the water heater may be higher than the wa- ter line, depending on the height of the water heater boiler supply connection. The piping must be air tight to prevent air from pocketing at the top of the piping, stopping flow.

2.The boiler MUST be filled and ready to operate before proceeding. Follow the boiler manual to fill the boiler.

3.Follow the procedure below to fill the boiler-to-water heater piping. See Fig- ure 16.

Step 1 Close isolation valves 5 and 6 to isolate the boiler.

Step 2 Close valve 3 and open valve 4. Con- nect a cold water supply hose to valve 3. Connect a hose from valve 4 to a drainable location.

Step 3 Close valve 10. Open valve 7.

Step 4 Open valve 3. Water will flow through valve 7 and out through valve 4 to drain. Let water run until all air has been removed from the line. Close valve 4. Then close valve 3.

Step 5 Close valve 7. Then open valve 10.

Step 6 Open valve 3. Water will flow through the circulator line, the water heater coil and the return piping, then out through valve 4 to drain. Let water run until all air has been removed from the line. Close valve 4. Then close valve 3. Remove hoses.

Step 7 Follow the instructions in “Water heater filling and start-up,” page 23, to fill the domestic water side of the water heater.

Step 8 Open valve 7 about ¼ turn for an initial setting.

Step 9 Open isolation valves 5and 6. Make sure the boiler water level is correct per the boiler manual.

Step 10 Start the boiler per instructions given in the boiler manual. Allow boiler to begin steaming.

Step 11 Start the DHW circulator. Watch the temperature at gauge 8. Adjust valve 7 until gauge 8 reads about 180°F with system at steady operation.

Step 12 Continue checking under varying DHW demand conditions to ensure system will operate as required.

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