AERCO KC1000 Low NOx Water Heater July 2011 - Manual (Page 48)

MAINTENANCE
6-4
4. Open the drain valve on the unit.
5. Slowly open the pressure relief valve to allow air-flow into the unit.
6. Fully drain the unit.
7. Disconnect electrical power from the unit.
8. Remove the 4 screws holding the BTU transmitter pump to the impeller housing. Remove and set the
pump aside, (See Fig. 6.3).
NOTE:
It is not necessary to disconnect the electrical wires to the pump.
Figure 6.3
BTU Transmitter Pump Disassembly
9. Using a 5/8” and 9/16” wrench, loosen the 4 compression fittings holding the lower tubing assembly in
place, (See Fig. 6.4).
COMPRESSION
FITTINGS
LOWER TUBING ASSEMBLY
Figure 6.4
Compression Fitting Locations