Part # 4521056 Rev 2 (02/21/12)
Page 11
Sensor Diagnostic Procedure
1. Visual inspection – is sensor mounted correctly
?
Is there
any visible damage to the sensor wires
?
2. Check sensor resistance for open or short circuit
conditions.
SENSOR DATA continued
3. Check sensor resistance and compare with the sensor
temperature.
4. Check the power supply voltage. It must be 12.0V DC.
5. Check the voltage at the control input. Does it match the
above table
?
PARTS REPLACEMENT
To Access Components
1. Unplug the unit.
2. Drain the liquid from the tank.
3. Turn the unit over and remove the bottom (10 screws).
4. Access front controls by removing 4 screws from the sides
and loosen 2 nuts securing the front section to the tank.
Heater
1. Remove the High Limit Bracket.
2. Remove the Bracket Spacer.
3. The heater is attached to the tank bottom with a pressure
sensitive adhesive. To remove the old heater, disconnect
the heater electrical connections. Peel the old heater
away from the tank.
4. Scrape as much of the old adhesive from the tank with a
sharp blade.
5. Use a 150-200 grit water paper to take o
ff
any remaining
adhesive. It is important to remove the old adhesive.
Installing the new heater without removing the old
adhesive will reduce the heat transfer to the tank and
reduce the life of the heater.
6. Clean the area with isopropyl alcohol. Clean any lint or
fi bers from the surface.
7. Replace the Bracket Spacer. This is to ensure the heater is
placed so it does not interfere with the bracket.
8. Peel the protective liner from the heater. Carefully align
the heater making sure it is square and even with one
edge of the tank. Start applying the heater from the
narrow edge in a slightly curved manner. Press the heater
to the tank applying from one side to the other. Applying
the heater in this manner will reduce the chance of
trapping air between the heater and the tank. Press the
heater down across the entire surface of the heater. This
helps to set the adhesive.
9. Replace the high limit bracket. If must make contact with
both heaters. The bracket may have to be bent slightly
toward the heaters.
10. Connect the wires, one to the high limit and the other to
the red wire.
11. Test and re-assemble the unit.
High Limit Thermostat
1. Remove the electrical connections.
2. Remove 2, 4-40 nuts from the old thermostat.
3. Verify the part number and temperature value is correct.
Component identifi cation varies with manufacturer.
The Honeywell version is marked L215 (opens at
215°F/102°C). The Selco version is marked OA-220 (open
at 220°F/104°C).
4. Install the new thermostat.
5. Replace the 2, 4-40 nuts. Do not over tighten.
6. Replace the electrical connections.
7. Test and re-assemble the unit.
Содержание EFW800
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