Model AHC-990/993
3-18
1
1. Place new cover plate from the kit, over the insulation, aligning
the notch with the nut on the heater. Figure 11. (Kits 140167,
140168 or 140169 won’t have new plate. Unit should already
have notched plate.) Figure 3-10.
12. Apply
Loctite thread locker (blue #246 MED/STR 450F) to the
studs before installing nuts.
Locate the 12 keps nuts from the kit and place them over the studs
and finger-tighten. (Kits 140167, 140168 or 140169 won’t have
hardware. Re-use element hardware.)
Using a
torque wrench and a
11/32”
socket, secure all the nuts to 7
inch lbs, following the pattern in Figure 3-11.
Refer to torque wrench’s manufacturer operator’s instructions, if
need be.
Re-tighten the nuts to 12 inch lbs,
again
following the pattern in
Figure 14.
DO NOT overtighten.
Overtightening the nuts could damage the coating on the heater,
causing the heater to fail prematurely.
13. Apply thermal compound (HP part no.
joint compound) to bottom of high limit and reinstall high limit
with spacers, and reconnecting high limit wires and water pan
heater wires to unit.
14. Reinstall water heater cover and re-connect water supply & drain.
15. If necessary, clean & delime any lime build-up under the concen
-
tration ring. Figure 3-12. Refer to KFC Standards Library proce-
dure for further details.
16. Re-supply power to the unit.
17. Clear the error codes from the controls by re-intializing the con-
trols in the Tech Mode, following the procedures below:
Press and hold until “L-2 LEVEL 2”, followed by,
“CLOCK SET”, shows in display.
Press 3 times and “TECH”, followed by, “ENTER
CODE” shows in display.
Figure 3-10
Figure 3-11
3-17. WATER PAN HEATER
REPLACEMENT
(Continued)
Figure 3-12
Jan. 2012
Summary of Contents for AHC-990
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