Tank Heater - Bunn VP17 Operating & Service Manual

SERVICE (cont.)

TANK HEATER

Location:
The tank heater is located inside the tank
and secured to the tank lid.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. Check the voltage across the black and white
wires with a voltmeter. Connect the brew to
the power source. The indication must be
120 volts ac.
3. Disconnect the brewer from the power
source.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the
Wiring Diagrams and check wiring harness.
4. Disconnect the black wire and the white wire or
red wire from the tank heater terminals.
5. Check for continuity across the tank heater ter-
minals.
If continuity is present as described, reconnect
the wires, the tank heater is operating properly.
If continuity is not present as described, replace
the tank heater.
S
I E
R
E
S
C
Y
D
A
E
R
N
N
U
B
W E R
L O
P1161
Page 12
NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Remove the tank inlet fitting securing the fill
basin to the tank lid, remove fill basin and tank
inlet gasket. Set all three parts aside for reassem-
bly.
2. Disconnect the black wire on the limit thermostat
from the tank heater switch and disconnect the
blue wire from the limit thermostat to the control
thermostat.
3. Disconnect the black wire and the white or red
wire from the tank heater terminals.
4. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reas-
sembly.
5. Remove the eight #8-32 nuts securing the tank
lid to the tank.
6. Remove the tank lid with limit thermostat,
sprayhead tube and tank heater
7 Remove the two hex nuts securing the tank
heater to the tank lid. Remove tank heater with
gaskets and discard.
8. Install new tank heater with gaskets on the tank
lid and secure with two hex nuts.
9. Install tank lid with limit thermostat, sprayhead
tube and tank heater using eight #8-32 hex nut.
10. Secure spayhead tube to hood using a hex nut.
11. Install sprayhead.
12. Reconnect the wires to the limit thermostat, tank
heater and control thermostat. See limit thermo-
stat and control thermostat sections in this manual
when reconnecting wires.
13. Install fill basin, secure with tank inlet fitting and
gasket.
14. Refer to the illustration on the next page when
reconnecting the tank heater wires.