AERCO RECON 1000 - Manual (Page 87)

RECON Water Heaters Installation, Operation & Maintenance Manual
CHAPTER 6 – MAINTENANCE
OMM-0103_0A AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 Page 87 of 178
GF-147 Phone: 800-526-0288 PRI: 10/28/2014
6.7 WATERSIDE INSPECTION
The waterside of the heating surfaces and anode 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-18532 Head Gasket
 GP-18556 Head Release Gasket
 24430 Anode Block Replacement Kit
To inspect the waterside of the heat exchanger, proceed as follows:
Waterside and Anode 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 P&T relief valve (see Figure 5-9, above) 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. Remove the top part of the enclosure by lifting up on the attached folding handle, and place it
in a safe location.
5. 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.
6. If the unit contains a baffle assembly, remove it to, exposing the heat exchanger tubes.
7. 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.
8. Inspect the anode blocks for corrosion. If they have corroded by more than 40% (original
dimensions are approximately 7 1/4" X 4”), replace them, as described in the next section,
before completing the remaining instructions below to reassemble the upper head. Order the
Anode Block Replacement Kit from AERCO, P/N 24430.
9. Place the head gasket (P/N GP-18532) on top of the heat exchanger shell flange.
10. If the unit contains a baffle assembly, replace it, aligning 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
11. 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.
12. Place the copper upper head liner on, aligning the holes with the 5/8-11 X 3-3/4” studs .
13. Replace the nuts and washers on the 5/8-11 X 3-3/4” studs .
14. Cross tighten the nuts to approximately 75 ft.-lb. torque to obtain a uniform seating, then
progressively tighten the nuts to 200 ft.-lb.
15. Close the drain valve and reopen the inlet, outlet, and recirculation valve.