AERCO KC1000 Heater w/Mod-Box Controller - Manual (Page 37)

MAINTENANCE
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12. Loosen the compression fitting holding the
hydraulic zero and control orifice tube
assembly to the pump’s impeller housing,
(See Fig. 6.6).
Figure 6.6
BTU Transmitter Disassembly
NOTE:
The cold water orifice is slightly larger than the
mixing orifice. The orifice must be correctly
installed for proper temperature control.
Figure 6.7
BTU Transmitter Pump Compression Fitting
Locations
13. Remove the compression fitting at the top of
the impeller housing and remove the
impeller housing, (See Fig. 6.7).
Figure 6.8
BTU Transmitter Hot Water Tube
Disassembly
14. Remove the compression fitting securing the
pump outlet tube to the ball valve and
remove the pump outlet tube.
15. Remove the ball valve connected to the hot
water tube coming from the top of the shell
by loosening the compression fitting
securing it to the hot water tube, (See Fig.
6.8).
16. Loosen the 90
o
compression fitting at the top
of the shell holding the hot water tube, (See
Fig. 6.9). Slide the hot water tube down
slightly but do not remove it from the unit.
Remove the 90
o
fitting.
17. Inspect all fittings and tubing for blockage
due to scale or debris. Clean or replace as
necessary.
18. Inspect the mixing orifice for blockage or
degradation due to erosion, (See Fig. 6.6).
Clean or replace as necessary.
19. The pump impeller may be checked by
removing the 4 screws from the cover
encasing the impeller in the housing, (See
Fig. 6.10).