Bunn Dual TF ユーザーガイド
Page 35
wires, the tank heaters are operating properly.
If continuity is not present as described, replace the
tank heater(s).
NOTE - If the tank heater remains unable to heat,
remove and inspect the heater for cracks in the sheath.
If continuity is not present as described, replace the
tank heater(s).
NOTE - If the tank heater remains unable to heat,
remove and inspect the heater for cracks in the sheath.
Electronic Control Models:
1. Disconnect the brewer from the power source.
2. Disconnect wires from heater(s).
3. Check for continuity across the tank heater termi-
1. Disconnect the brewer from the power source.
2. Disconnect wires from heater(s).
3. Check for continuity across the tank heater termi-
nals.
If continuity is present as described, the tank heater is
operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE - If the tank heater remains unable to heat,
remove and inspect the heaters for cracks in the
sheath.
operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE - If the tank heater remains unable to heat,
remove and inspect the heaters for cracks in the
sheath.
Removal and Replacement:
1. Remove wires from tank heater.
2. Remove the four #8-32 nuts securing tank heater
1. Remove wires from tank heater.
2. Remove the four #8-32 nuts securing tank heater
to tank lid.
3. Remove tank heater and gasket.
4. Install new tank heater and gasket with four #8-32
4. Install new tank heater and gasket with four #8-32
nuts on tank lid.
5. Refer to the illustration below when reconnecting
the wires.
SERVICE (cont.)
TANK HEATERS
P985
P803
Location:
The tank heaters are located on the left and
right side of the tank lid.
Test Procedure:
Electro/Mechanical Models.
1. Disconnect the brewer from the power supply.
2
1. Disconnect the brewer from the power supply.
2
Check the voltage across the black and the red
wires on three wire 120/208V, 120/240V or two
wire 200V, 240V models on the tank heaters. With
the control thermostat turned to the "ON" position
(fully clockwise), connect the brewer to the power
supply and check the voltage across the wires with
a voltmeter. The indication should be:
wires on three wire 120/208V, 120/240V or two
wire 200V, 240V models on the tank heaters. With
the control thermostat turned to the "ON" position
(fully clockwise), connect the brewer to the power
supply and check the voltage across the wires with
a voltmeter. The indication should be:
a.) 208 volts ac for three wire 120/208 volt mod-
els and 240 volts ac for three wire 120/240 volt
models.
models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.
3. Disconnect the brewer from the power supply.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the
wiring diagrams and check the wiring harness.
If voltage is not present as described, refer to the
wiring diagrams and check the wiring harness.
4. Remove the black and red wires from the tank
heaters.
5. Check for continuity across the terminals of the
tank heaters.
If continuity is present as described, reconnect the
RED to Contactor
BLK to Contactor
LEFT & RIGHT
BLU
BLK
BLK to Terminal Block
(Black Insert)
(Black Insert)
BLU Lead from
from Triac Assy.
from Triac Assy.
RIGHT
LEFT
ELECTRO/MECHANICAL
ELECTRONIC
.
MI
NU
TE
S
BU
NN
-O
-M
AT
IC
P/
N
26
20
-
12
0 V
AC
.
MI
NU
TE
S
BU
NN
-O
-M
AT
IC
P/
N
26
20
-
12
0 V
AC
2
2
2
1.5
1.5
1
1
1
.5
.5
2.5
2.5
MI
NU
TE
S
MINUTES
MI
NU
TE
S
MINUTES
MI
NU
TE
S
MINUTES
P/
N
24
48
6-0
00
0
12
0 V
AC
P/N 24486-0000 120 VAC
BU
NN
-O
-M
AT
IC
BUNN-O-MATIC
3
3
3
4
4
5
5
6
6
7
8
2
2
2
1.5
1.5
1
1
1
.5
.5
2.5
2.5
MI
NU
TE
S
MINUTES
MI
NU
TE
S
MINUTES
MI
NU
TE
S
MINUTES
P/
N
24
48
6-0
00
0
12
0 V
AC
P/N 24486-0000 120 VAC
BU
NN
-O
-M
AT
IC
BUNN-O-MATIC
3
3
3
4
4
5
5
6
6
7
8
ST
AR
T
ON
/ W
AR
ME
R
SE
LE
CT
OR
RE
AD
Y
RE
AD
Y
ON
/ W
AR
ME
R
ST
AR
T
1
1⁄2
ga
l
1 g
al
1⁄2
ga
l
SE
LE
CT
OR
1
1⁄2
ga
l
1 g
al
1⁄2
ga
l
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