Innovation Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 6 – MAINTENANCE
OMM-0078_0M
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
85
of
216
GF-128
Phone: 800-526-0288
09/11/2015
6.7 WATERSIDE INSPECTION
The waterside of the heating surfaces is inspected by removing the top heater head (see Figure
6-7). Prior to performing the inspection, ensure that the following replacement parts are available:
•
Release Gasket,
P/N
GP-18556
•
Shell Gasket, P/N
GP-18532
•
Anode Block Replacement Kit, P/N
24430
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.
CAUTION
Do not drain the unit without venting the shell! A vacuum in the unit
may displace the head liner causing serious damage not covered by
warranty.
4.
Referring to see Figure 6-7, below, remove the 5/8-11 hex nuts and washers from the upper
head, and then remove the upper head, upper head-liner and gaskets.
5.
Pull the baffle assembly out of the chamber, exposing the heat exchanger tubes.
6.
Inspect and clean the heat exchanger tubes of scale and clean all gasket surfaces
thoroughly before reassembling the upper head. AERCO recommends that NEW gaskets
be used when reassembling.
7.
Inspect the anode blocks for corrosion. If they have corroded by more than 40% (original
dimensions are 7-1/4" X 4” (18.4 cm X 10.16 cm)), replace them, as described in the next
section, before completing the remaining instructions below to reassemble the upper head.
Order the Anode Replacement Kit from AERCO, P/N
24430
.
8.
Place the shell gasket (P/N
GP-18532
) on top of the heat exchanger shell flange.
9.
Replace the baffle assembly. If it includes threaded positioning rods, align the top surface of
the spindle caps with the top surface of the head gasket. If the caps protrudes above the
top edge of the head gasket, it may damage the copper head liner
10.
Place the head release gasket (P/N
GP-18556
) on top of the head gasket, aligning the
gasket holes with the bolts in the shell flange.
11.
Place the copper upper head liner on, aligning the holes with the 5/8-11 X 3-3/4” (9.53 cm)
studs.
12.
Replace the nuts and washers on the 5/8-11 X 3-3/4” (9.53 cm) studs.
13.
Cross tighten the nuts to approximately 75 ft.-lb. (101 Nm) torque to obtain a uniform
seating, then progressively tighten the nuts to 200 ft.-lb. (271 Nm).
14.
Close the drain valve and reopen the inlet, outlet, and recirculation valve.
