Waterside Inspection - Watts Aerco Innovation 800 User Manual

Innovation Hot Water Hot Water Boiler User Manual

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
To inspect the waterside of the heat exchanger, proceed as follows:
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.
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. Place two Baffle Spacer strips (P/N
heat exchanger tubes, one on either side.
8. Rotate the baffle assembly so that the threaded studs will be away from the sensor and
water outlet and then push it down into the heat exchanger until it comes in firm contact
with the Baffle Spacer strips. The thickness of these strips (1/8") represents the correct gap
between the baffle assembly and the heat exchanger tubes. They are soluble and will
dissolve quickly when the unit is restarted.
9. Place the shell gasket (P/N GP-18532) on top of the heat exchanger shell flange.
10. If necessary, use a straight edge to adjust the threaded rods until the tops of the spindle
caps are aligned with the top surface of the head gasket. If the caps protrude 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" (9.53 cm)
studs.
13. Replace the nuts and washers on the 5/8-11 X 3-3/4" (9.53 cm) studs.
14. 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).
15. Close the drain valve and reopen the inlet, outlet, and recirculation valve.
OMM-0120_0A
GF-128-I
CHAPTER 6 – MAINTENANCE
Waterside Inspection
--CAUTION -
49274,
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
- INTERNATIONAL
included with kit # 24427-TAB) on top of the
Page 79 of 174
11/15/2016