AERCO Innovation (G-10-1350 to G-11-0563) - Manual (Page 66)

GF
-
128
Innovation Series Water Heaters Chapter 6
OMM-0079_0B USER MANUAL Maintenance
Page 66 of 200 AERCO International, Inc. · 100 Oritani Dr. · Blauvelt, NY 10913 · Ph.: 800-526-0288
07/21/11
1. Disconnect the electrical power to the unit.
2. Close the water inlet, outlet, and recircuation shut-off valves to the unit.
3. Carefully open the drain valve while opening the relief valve on the rear of the unit to relieve pressure
and allow air into the shell.
4. Remove the wing nut from the top center of the shell cap and remove the cap.
5. Remove the nuts and cap screws from the upper head. Remove the upper head and upper head-liner,
(See Figure 6-7).
6. Inspect and clean the heat exchanger tubes of scale and all gasket surfaces thoroughly before
reassembling the upper head. AERCO recommends that NEW gaskets be used when reassembling.
7. Place a shell head gasket on top of the shell ring first, then place the release gasket on top of the shell
head gasket. Align the gasket holes with those in the shell ring.
8. Place the upper head liner on top of the gaskets.
9. Place the upper head on next aligning the holes.
10. Reassemble the cap screws and nuts through the upper head and shell ring. Cross tighten the nuts to
approximately 75 ft.-lb. torque to obtain a uniform seating, then progressively tighten the nuts to 150
ft.-lb.
11. Replace the unit Cap. Close the drain valve and reopen the inlet, outlet, and recirculation valve.
Figure 6-7. Flat Style Head Configuration