Raypak HD101, HD401 operating instructions Reversing Water Connections, Relief Valve Piping

Reversing Water Connections

Follow these instructions to change the water connec- tions from the left- hand side (standard) to the right-hand side.

1.Disconnect all electrical power from the heater (if applicable).

2.Label all electrical connections and conduit lines. This may include the flow switch, low water cut-off probe and/or pump.

3.Disconnect or isolate the main gas pipe from the heater (if applicable).

4.Remove both in/out and return header access panels by removing all sheet metal screws.

5.Remove all plumbing fittings to the header. This will include both inlet and outlet water pipe unions and the pressure relief valve and drain piping.

6.Remove limits, control bulbs and/or sensors.

7.Remove the six flange nuts and the in/out header from the left-hand side.

8.Remove the six flange nuts and the return header from the right-hand side.

9.Remove the header stud bolts from each tube sheet.

10.Reverse the headers and stud bolts to the new location.

11.Install NEW red beveled O-rings flush against both tube sheets with the bevel facing outward.

12.Push the header firmly against the O-rings. Install and tighten the flange nuts onto the stud bolts until finger tight.

13.Slowly tighten the flange nuts, starting from the center nut (number 1) in Fig. 9 and working sequentially around the header as indicated. Torque all nuts to 25 ft/lb. DO NOT OVER-TIGHT-

EN.

14.Re-route the capillary(s), wiring, etc., to the new location, adding thermal paste and shim to the capillary well.

Fig. 9: Torque Sequence

Relief Valve Piping

WARNING: Pressure relief valve discharge piping must be piped near the floor and close to a drain to eliminate the potential of severe burns. Do not pipe to any area where freezing could occur. Refer to local codes.

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