Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 6 – MAINTENANCE
OMM-0078_0J
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
79
of
196
GF-128
Phone: 800-526-0288
PRI: 11/22/2013
6.7 WATERSIDE INSPECTION
The waterside of the heating surfaces may be inspected by removal of the top heater head (see
Figure 6-7). Prior to performing the inspection, ensure that the following replacement gaskets are
available:
•
GP-18556 Release Gasket
•
GP-18532 Shell Gasket
To inspect the waterside of the heat exchanger, proceed as follows:
Waterside Inspection
1. Disconnect the electrical power to the unit.
2. Close the water inlet, outlet, and recirculation 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.
