Repair manual

Page 20
FIG. 20-1 DV TANK HEATERS
Location:
The tank heaters are located inside the tank and secured
to the tank bottom.
Test Procedures:
1. With a voltmeter, check voltage across the white
wire (120V Models) or red wire (120/208-240V
Models) from the terminal block and black wire
from the control board. Connect brewer to the
power source. The indication must be 120 volts
ac for two wire 120 volt models or 208-240 volts
ac for three wire 120/208-240 volt models (during
a heating cycle).
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the
Wiring Diagrams and check wiring harness. If harness
checks ok, replace control board.
3. Disconnect the wires from the tank heater termi-
nals.
4. Check resistance value across tank heater terminals
and compare to chart.
If resistance is present as described, reconnect the
wires, the tank heater is ok.
If resistance is not present as described, replace the
tank heater.
NOTE- If any resistance is read between sheath and
either terminal, remove and inspect heater for cracks
in the sheath.
TANK HEATERS
1425W
Small
Dia.
2268W
Large
Dia.
1425W-120V 10.10
3500W-240V 16.46
1850W-240V 31.14
3500W-200V 11.43
3000W-240V 19.20
2268W-240V 6.35
HEATER
Removal and Replacement:
1. Remove the top cover or top warmer housing and
front access panel as previously described.
2. Drain water from the tank.
3. Disconnect all the hoses from the tank.
4. Disconnect the temperature probe from the top of
the tank by pulling the probe from the grommet in
the top of the tank lid.
5. Remove both level probes from their grommets.
6. Disconnect the green wire from the top of the
tank.
7. Disconnect the limit thermostat from the side of
the tank.
8. Disconnect the two white wires from the tank
warmer blanket.
9. Disconnect the wires from tank heater terminals.
10. Remove the four #8-32 nuts securing the tank to
the mounting brackets and remove the tank as-
sembly.
11. Remove the eight #8-32 nuts securing the tank lid
to the tank.
12. Remove the two hex nuts securing the tank heater
to the bottom of the tank. Remove tank heater with
gaskets and discard.
13. Install new tank heater(s) with gaskets to the bot-
tom of the tank and secure with two hex nuts.
14. Install tank assembly onto mounting brackets and
secure in place with four #8-32 nuts.
15. Install tank lid and secure in place with eight #8-32
nuts.
16. Connect the two white wires of the tank warmer
blanket.
39132 041708
RESISTANCE
TERMINAL TO SHEATH - INFINITE (OPEN)