AERCO KC1000 Heater Mar 2011 - Manual (Page 48)

MAINTENANCE
6-4
6.7 BTU TRANSMITTER ASSEMBLY
The BTU Transmitter is a crucial part of the unit’s temperature control system. It must be inspected and
kept free of scale and debris in order for the unit to maintain accurate outlet water temperatures.
To inspect the transmitter:
1. Place the ON/OFF switch in the OFF position.
2. Remove the sheet metal side panels and hood from the unit.
3. Shut the water inlet, outlet and recirculation valves to the unit.
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).