A.O. Smith DSE-5, Руководство по обслуживанию

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Servicing should only be performed by a Qualified Service Agent
31
OPERATION & SERVICE
Replacing Heating Elements
1 Secure power to the water heater at the main breaker or disconnect switch.
2 Verify with an AC volt meter that there is not any voltage present at the Power Distribution Block and
contactors inside the water heater - see Figures 1 and 2 on pages 8 and 9 for location and pages 12 - 14
for power supply test procedures.
3 Close the cold water supply valve to the water heater and drain the water heater - follow the draining
instructions in the Maintenance Section of Instruction Manual that came with the water heater. If the
Instruction Manual is not available copies can be obtained from the manufacturers web site or by calling
the toll free phone number on the back cover of this manual.
4 Remove the four heating element flange bolts and remove the heating element(s) being replaced - leave
wiring leads connected to the contactor(s).
5 Disconnect all wiring leads from the old heating element at the contactor(s). Pay close attention to wiring
leads and which heating element loops (see pages 16 & 17) connect to which terminals on the
contactor(s). Use wire markers (see Tools Required page 3) to label contactor terminals and/or the wiring
leads of the heating element to ensure the new element is properly wired.
6 Install the new heating element and a new element gasket. Install/tighten four heating element flange bolts.
Replacement elements and gaskets can be obtained from local distributors or by calling the toll free phone
number on the back cover of this manual.
7 Connect the new heating element wiring leads to the contactor(s) according to the wiring diagram on the
water heater and the wire marker labels attached in Step 5 above. Securely tighten wiring leads at
contactor(s).
8 Heating elements sometimes fail due to problems with wiring or other water heater components. Be sure to
check fuses (page 15), inspect contactors (page 36) and check all wiring and connections between the
heating elements, contactors, fuses and the power distribution block. Ensure all wiring is correct - see the
wiring diagram on the water heater. Ensure all connections are tight and making good contact - replace
any wiring, fuses, contactors that are damaged or show signs of excessive wear.
9 Close the water heater drain valve and follow the filling instructions in the Maintenance Section of
Instruction Manual that came with the water heater.
10 Double check all heating element flange bolts to ensure they are properly tightened and check all heating
element wiring to ensure it is properly connected and tightened.
11 Restore power to the water heater and place the water heater back in service. Check amp draw at all
heating elements with a 100% call for heat active. See page 25.