Aerco KC Series Installation, Operation & Maintenance Instructions Manual page 38

Figure 6.9
BTU Transmitter Shell Components
Figure 6.10
Impeller Housing Disassembly
21 Once the BTU transmitter has been
inspected and cleaned, reassemble in the
reverse order.
NOTE:
Do not attempt to adjust the Hydraulic Zero
Needle Valve. This is a factory-preset item.
Refer to Figure 6.6.
Compression fittings are nickel-plated and
should be replaced only with nickel-plated
fittings. Do not use brass fittings
6.8 MANIFOLD AND EXHAUST TUBES
The presence of even trace amounts of
chlorides and/or sulfur, in the combustion air and
fuel sources, can lead to the formation of
deposits on the inside of the exchanger tubes,
the exhaust manifold, and/or the condensate
cup. The degree of deposition is influenced by
the extent of the condensing operation and the
chloride and sulfur levels that vary significantly
from application to application.
The following parts will be necessary for
reassembly after inspection:
GP-122537
Combustion Chamber
GP-18900 Manifold to Tubesheet
GP-18899
GP-122551 Burner Release Gasket
GP-161151 Combustion Chamber Liner
To remove the manifold for inspection:
1. Disconnect AC power and turn off the gas
supply to the unit.
2. Remove the sheet metal covers from the
unit.
3. Disconnect the plastic tubing from the
condensate cup to drain and remove the
rear covers.
4. Remove the condensate cup from under the
unit and the condensate drainage tubing
from the manifold.
Disconnect the flame detector and ignition
5.
cable wires from the flame detector and
ignitor contactor. Remove the flame detector
and ignitor as per sections 6.2, and 6.3.
6. Remove the grounding terminal from the
burner by loosening the upper screw and
sliding the connector from the grounding rod,
(See Fig. 6.11).
7. Using a 7/16" socket or open end wrench
remove the four 1/4"-20 nuts on the gas inlet
pipe flange at the burner, (See Fig. 6.12).
8. Using two 9/16" wrenches remove the 3/8"-
16 hex nuts and bolts on the gas inlet pipe
flange at the air/fuel valve, (see Fig. 6.12).
33
MAINTENANCE
NOTE:
.
Exhaust Manifold to
Gasket
Gasket
Burner Gasket