®
BUNN
W
H5E
H5X
R E P L A C E M E N T O F A N Y C O M P O N E N T !
B E F O R E R E M O V A L O F A N Y P A N E L O R
D I S C O N N E C T F R O M P O W E R S O U R C E
!
A R N
I N G
WARNING
!
Very Hot Water
Use With Care!
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
10420.0000G 7/00 © 1989 BUNN-O-MATIC CORPORATION
USER NOTICES
The notices on this dispenser should be kept in good condition. Replace unreadable or damaged labels.
12593.0000
00831.0000
00656.0000
10044.0000
10420 072500
3
ELECTRICAL REQUIREMENTS
CAUTION - The dispenser must be disconnected from the power source until specified in Initial Set-Up.
This dispenser requires 2-wire, grounded service rated 120, 208, or 240 volts ac, 20 amp, single phase.
(Refer to the dispenser’s dataplate for exact voltage requirement.)
Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.
WHITE
1. An electrician must provide electrical service as specified.
NEUTRAL
120V.A.C.
L1 BLACK
2. Using a voltmeter, check the voltage and color coding of each conductor at
the electrical source.
3. Remove the upper and lower rear panels. Place the tank heater switch on the
electronic control assembly in the “OFF” position.
4. Install a strain relief and the proper electrical wiring to the terminal block.
L2 RED
5. Connect the dispenser to the power source and verify the voltage at the termi-
208 or 240V.A.C.
nal block before proceeding. Reinstall both rear panels.
L1 BLACK
6. Ifplumbingistobehooked-uplaterbesurethedispenserisdisconnectedfrom
the power source. If Plumbing has been hooked-up, the dispenser is ready for
Initial Set-Up.
PLUMBING REQUIREMENTS
This dispenser must be connected to a COLD WATER system with operating pressure between 20 and 90 psi (138
1
and 620 kPa) from a ⁄2" or larger supply line. A shut-off valve should be installed in the line before the dispenser.
Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The
1
water inlet fitting is ⁄4" flare.
1
3
NOTE - Bunn-O-Matic recommends ⁄4" copper tubing for installations of less than 25 feet and ⁄8" for more than
1
25 feet from the ⁄2" water supply line. At least 18 inches of an FDA approved flexible beverage tubing, such as
reinforced braided polyethylene or silicone, before the dispenser will facilitate movement to clean the countertop.
It can be purchased direct from Bunn-O-Matic (part number 00326-0000). Bunn-O-Matic does not recommend
the use of a saddle valve to install the dispenser. The size and shape of the hole made in the supply line by this type
of device may restrict water flow.
This equipment must be installed to comply with the Basic Plumbing Code of the Building Officials
and Code Administrators International, Inc. (BOCA) and the Food Service Sanitation Manual of the
Food and Drug Administration (FDA).
A
b
C
F
IRUYIN
G
ustibles.
al co
O
B
E
READ THE ENT
M
IRE OPERATING MANUAL
,
P
LIABILITY BEFORE
INCLUDING THE LIMIT OF WARRANTY AND
LY
O
R
G
OR USING THIS PRODUCT
des
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,
.
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ENEVER
THIS APPLIANCE IS HEATED WH
H
M
E
R
POWER SOURCE
D
Z
N
A
T
CONNECTED TO
A
00831.0000A 5/88 1988 BUNN-O-MATIC CORPORATION
©
Plumbing Hook-Up
1. Flush the water line and securely attach it to the flare fitting on the
rear of the dispenser.
2. Turn-on the water supply.
This equipmen
comply with the Ba
Administrators International,
the Building Officials an
and the Food Service Sanitation M
of the Food and Drug Administration (
anual
P1770
10420 072500
4
INITIAL SET-UP
CAUTION - The dispenser must be disconnected from the power source throughout the initial set-up, except
when specified in the instructions.
1. Remove the upper rear panel and place the tank heater switch in
the “OFF” position and replace the panel.
Connect the dispenser to the power source and turn-on the water
supply.
Water will automatically flow into the tank to the proper level and
shut-off. This will take approximately 10 minutes.
Disconnect the dispenser from the power source, remove the up-
per rear panel and place the tank heater switch in the “ON” posi-
tion, and replace the panel.
2.
3.
4.
DO NOT
!
O
ON
O
CAUTIO
Until Water Comes From Ope
Turn On The Tank He
STOP
H
ot
W
READ NOT
Automatically When Unit Is
C
ater Systems
Coffee Brew
–
Accordance
W
W
ers
–
ater Tank
W
Failure To Comply Voids Warranty!
ith The Installation Instructions!
Fill The
W
onnected To Power!
ill Fill
ater Tank In
WARNING
HAZARDO
VOLTAGE
DISCONNECT FROM
POWER SOURCE
BEFORE REMOVING!
5. Connect the dispenser to the power source and wait approximately
twenty minutes for the water in the tank to heat.
P1771
6.
On models with ready indicator, the indicator will glow when the
proper water temperature for use is achieved.
NOTE - Discontinue dispensing if the indicator LED turns off. Dispense only when the indicator LED glows.
DRAINING THE DISPENSER
CAUTION - The dispenser must be disconnected from the power source throughout these steps.
1. Disconnect the dispenser from the power source.
2. Shut-off and disconnect the incoming water supply
3. Remove the 4-40 screws at the sides of the top panel.
4. Gently remove one of the grommets from the tank lid.
5. Insert a tube to the bottom of the tank and syphon ALL of the water out. Bunn-O-Matic has a syphon assem-
bly available (#12440.0000) for this purpose.
NOTE - The dispenser must be full using the INITIAL SET-UP steps before reconnecting to the power source.
CLEANING
The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.
WALL MOUNTED INSTALLATION
If the dispenser is wall mounted, the bottom of the dispenser should be at the same height as a counter or
table top. Use B.O.M. part #12542.0000 for side mounted Wall Bracket Kit or # 13125.0001 for front mounted
Wall Bracket Kit .
SUPPORT FOR LARGE RECEPTACLES
CAUTION: If the dispenser is to be used with larger receptacles such as pitchers or pots, those receptacles must
be adequately supported during dispensing of hot water to avoid spillage of very hot water. This support may be
provided by a table or counter top, or use B.O.M. part #12599.0000 Shelf Kit
10420 072500
5
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Tech-
nical Service Department.
•
•
•
Inspection, testing, and repair of electrical equipment should be performed only by qualified service person-
nel.
All electronic components have 120 – 240 volt ac and low voltage dc potential on their terminals. Shorting of
terminals or the application of external voltages may result in board failure.
Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an
intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
•
•
Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will
help to avoid twists and kinks in the tubing.
•
•
Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
This dispenser is heated at all times. Keep away from combustibles.
WARNING
•
•
Exercise extreme caution when servicing electrical equipment.
Disconnect the dispenser from the power source when servicing, except when electrical tests are speci-
fied.
•
•
Follow recommended service procedures
Replace all protective shields or safety notices
Problem
Probable Cause
Remedy
Equipment will not operate.
1. No power or incorrect voltage (A) Check the terminal block for the cor-
rect voltage. It should be:
a.) 100 to 120 volts ac across the black and
white terminals for 100 to 120 volt models
or,
b.) 200 to 240 volts ac across the red and
black terminals for 200 to 240 volt models.
(B) Check circuit breakers or fuses.
2. Safety overflow switch
Refer to Service – safety overflow switch
for testing procedures. See page 17.
10420 011599
6
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Automatic refill will not operate 1. No water
after drawing hot water.
Check plumbing and shut-off valves.
2. Water strainer/flow control
(A) Direction of flow arrow must be point-
ing towards dispenser.
(B) Remove the strainer/flow control and
check for obstructions. Clear or replace.
3. Safety overflow switch
4. Liquid level system
5. Solenoid valve
Refer to Service – safety overflow switch
for testing procedures. See page 17.
Refer to Service – electronic controls for
testing procedures. See page 10.
Refer to Service – solenoid valve for test-
ing procedures. See page 18.
Water flows into the tank con- 1. Solenoid valve
tinuously (Dispenser discon-
nected from power source).
Refer to Service – solenoid valve for test-
ing procedures. See page 18.
Water flows into the tank con- 1. Liquid level system
tinuously (Dispenser connected
Refer to Service – electronic controls for
testing procedures. See page 10.
to power source).
Water is cold.
1. Tank heater switch
2. Safety overflow switch
3. Limit thermostat
Tank heater switch must be in the “ON”
position.
Refer to Service – safety overflow switch
for testing procedures. See page 17.
Refer to Service – limit thermostat for test-
ing procedures. See page 16.
CAUTION – Do not eliminate or bypass limit thermostat. Use only B.O.M. replacement part #23717.0001.
4. Tank heater
Refer to Service – tank heater for testing
procedures. See page 19.
5. Temperature control
Refer to Service – electronic controls for
testing procedures. See page 10.
10420 011599
7
TROUBLESHOOTING (cont.)
Problem
Probable Cause
Remedy
Water boils continuously.
1. Temperature control
Refer to Service – electronic controls for
testing procedures. See page 10.
2. Lime build-up
Inspect the tank assembliy for excess lime
deposits. Delime as required.
CAUTION – Tanks and tank components should be delimed reglarly depending on local water conditions. Exces-
sive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks.
Dispenser is making unusual
noises.
1. Solenoid valve
2. Plumbing lines
3. Water supply
The nut on top of the solenoid valve must
be tight or it will vibrate during operation.
Plumbing lines should not be resting on the
counter top.
(A) The dispenser must be connected to a
cold water line.
(B) Water pressure to the dispenser must
not be higher than 90 psi (620 kPa). Install
a regulator if necessary to lower the work-
ing pressure to approximately 50 psi (345
kPa).
Ready indicator will not light.
(when temperature is within 4°
of its selected setting.)
1. Temperature control
2. Ready Indicator LED
Refer to Service – electronic controls for
testing procedures. See page 10.
Replace the indicator LED.
10420 072500
8
SERVICE
This section provides procedures for testing and
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replacing various major components used in this dis-
penser should service become necessary. Refer to
Troubleshooting for assistance in determining the cause
of any problem.
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Component Access
WARNING – Disconnect the dispenser from the power
source before the removal of any panel or the replace-
ment of any component.
P1770
The limit thermostat, liquid level probe, tank heater,
and temperature sensor are located at the top of the
dispenser. Access is gained by removing the top lid,
attached with three 4-40 slotted-head screws.
!
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The triac assembly is located beneath the tank. Access
is gained by removing four feet and the bottom panel
attached with seven 8-32 slotted-head screws.
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dispenser.
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WARNING – Inspection, testing, and repair of electrical
equipment should be performed only by qualified ser-
vice personnel. Disconnect the dispenser from the
P1770
The check valve, electronic control assembly, safety power source when servicing, except when electrical
overflow switch, solenoid valve, overflow tube tem- tests are required and the test procedure specifically
perature sensor and terminal block are located at the states to connect the dispenser to the power source.
rear of the dispenser. Access is gained by removing
the upper and lower rear panels. The upper is attached Electronic Controls ............................................. 10
with six 8-32 slotted-head screws. The lower is attached Limit Thermostat ................................................ 16
with four 8-32 slotted-head screws. The middle panel Safety Overflow Switch....................................... 17
must not be removed from the dispenser.
Solenoid Valve .................................................... 18
Tank Heater ........................................................ 19
Electronic Control Assembly Troubleshooting:
Check these items first
•
•
Is circuit board popped-out of bracket?
Is circuit board wet due to misaligned overflow
tube?
!
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•
•
•
Is water in overflow cup activating float switch?
Isoverflowcupnotmakinggoodcontactwithtank?
Is dispenser being operated with panels removed?
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P1770
10420 011599
9
SERVICE (cont.)
Electronic Controls
D
Un
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Hot Water
C
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R
Automatically When Unit Is Connected To P
m
Tank
Coffee Brewers
Accordance With The Installation Instructions!
H
Openeater
S
–
Water Tank Will Fill
ed Fa
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12561.0000
M2522.1000
12565.0002
01520.0000
P1772
00971.0000
FIG. 1 ELECTRONIC CONTROL
02328.0003
P1773
FIG. 2 TRIAC
Location:
The electronic control assembly is located inside the rear of the dispenser. Access will also be needed to the
temperature sensor, overflow tube temperature sensor, and liquid level probe located on the tank lid and to the
triac assembly located beneath the tank.
General:
H5E, H5X LIQUID LEVEL CONTROL
This system controls the liquid level and water tem-
perature of the dispenser. These two functions act in-
PROBLEM: Overflows
dependently of each other and should be tested sepa-
Drain cup
rately.
Unplug Ready Lamp
Retry
Liquid Level Control Flow Charts
No
Overflow
Replace Ready Lamp
?
Yes
H5E, H5X LIQUID LEVEL CONTROL
Drain cup
PROBLEM: Does Not Refill
Disconnect Probe
Wire From Probe
Short Probe Wire
To Chassis
Yes
Overflow Cup Full
?
Remove Power
Retry
Drain cup
Retry
No
Disconnect Level Probe
No
Overflow
?
Replace Probe
Yes
Yes
Yes
Voltage present at
Solenoid Valve
?
Does Water Flow
?
Replace Probe
Drain cup
Disconnect Wire From
Solenoid Valve
No
No
Retry
Unplug Ready Lamp
Replace Solenoid Valve
Yes
Overflow
?
Replace Solenoid Valve
Yes
Voltage present at
Solenoid Valve
?
Replace Ready Lamp
No
No
Replace Control Assembly
Replace Control Assembly
10420 011599
10
SERVICE (cont.)
tronic control assembly.
5. Check the voltage across terminals 1 & 4 of the
electronic control assembly with a voltmeter. Con-
nect the dispenser to the power source. The indi-
cation must be:
a.) 100 to 120 volts ac for 100 to 120 voltmodels
or
b.) 200 to 240 volts ac for 200 to 240 volt models
after a delay of approximately 5 seconds.
6. Disconnect the dispenser from the power source.
Electronic Controls (cont.)
Liquid Level Control Test Procedure
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control assembly with a voltmeter. Con-
nect the dispenser to the power source. The indi-
cation must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
If voltage was present as described, the liquid level
control of the system is operating properly, proceed to
#7.
If voltage was not present as described, replace the
electronic control assembly and the temperature sen-
sor in the tank lid.
b.) 200 to 240 volts ac for 200 to 240 volt models.
3. Disconnect the dispenser from the power source.
If voltage was present as described, proceed to #4.
If voltage was not present as described, refer to
the Wiring Diagrams and check the dispenser wir-
ing harness.
4. Remove the pink wire from terminal 5 of the elec-
NOTE - Each electronic control assembly is calibrated
to a temperature sensor. Both components MUST be
replaced as a set.
Temperature Control Flow Charts
H5X THERMOSTAT
H5E THERMOSTAT
PROBLEM:Water Not Hot Enough
PROBLEM:Water Not Hot Enough
Jumper JP1
No
Reposition Jumper
In Boil Position
?
Turn Temperature
Adjustment Screw
Clockwise Contiuously
No
Red Light On
Constantly
?
Yes
Yes
Red Light On
?
Yes
Measure Voltage
At Tank Heater
No
Adjust For Correct
Water Temperature
Red Light On
Constantly
?
Replace Steam Sensor
No
Yes
Replace Control Assembly
Replace Tank Heater
Red Light On
Constantly
?
Yes
Yes
Voltage Present
?
Measure Voltage
At Tank Heater
Recheck Water Temperature
No
No
Replace Control Assembly
Replace Tank Heater
Yes
Voltage Present
?
No
Replace Limit Thermostat
Limit Thermostat OK
?
No
Yes
No
Replace Control Assembly
Replace Limit Thermostat
Limit Thermostat OK
?
Measure Voltage
At Tank Heater
Yes
Replace Triac
Replace Control Assembly
No
Measure Voltage
At Tank Heater
Voltage Present
?
Check For Split Tank Heater
Reinstall Original
Control Assembly
Yes
Replace Triac
No
Recheck Water Temperature
Voltage Present
?
Check For Split Tank Heater
Reinstall Original
Control Assembly
Yes
Recheck Water Temperature
10420 011599
11
SERVICE (cont.)
If voltage was present as described, reinstall the probe,
the sensing function of the system is operating prop-
erly.
If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.
Electronic Controls (cont.)
7. Reconnect the pink wire to terminal 5 of the elec-
tronic control assembly.
8. Loosen the compression fitting, remove the probe
from the tank lid, and inspect it for mineral depos-
its. Replace it if necessary. Keep the exposed ends
of the probe away from any metal surface of the
dispenser.
9. Check the voltage across terminals 1 & 4 of the
electronic control assembly with a voltmeter. Con-
nect the dispenser to the power source. The indi-
cation must be:
Temperature Control Test Procedure
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control circuit board with a voltmeter.
Connect the dispenser to the power source.The in-
dication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models.
3. Disconnect the dispenser from the power source.
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
after a delay of approximately 5 seconds.
10. Touch the screw head end of the probe to the dis-
penser housing. The indication must be 0.
11. Move the probe away from the dispenser housing.
The indication must again be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
after a delay of approximately 5 seconds.
12. Disconnect the dispenser from the power source.
If voltage was present as described, proceed to #4.
If voltage was not present as described, refer to the
Wiring Diagram and check the dispenser wiring har-
ness.
4. Connect the dispenser to the power source and
place the tank heater switch in the “ON” position.
5. Observe the red indicator on the electronic control
circuit board.
6. Disconnect the dispenser from the power source.
Temperature Control Flow Charts (cont.)
H5X THERMOSTAT
H5E THERMOSTAT
PROBLEM: Boils
PROBLEM: Boils Excessively - Fills Cup
Drain cup
Retry
Drain cup
Retry
Yes
Red Light On While
Replace Steam Sensor
Boiling
?
Yes
Red Light On While
Replace Control Assembly
Boiling
?
No
No
Yes
Disconnect Blue Wire From
Control Board Pin 7
Still Boiling
?
Replace Control Assembly
Disconnect Blue Wire From
Control Board Pin 7
Retry
Retry
No
Finished
Yes
Still Boiling
?
Replace Triac Assembly
Yes
Still Boiling
?
Replace Triac Assembly
Check For Split
Tank Heater
No
Check For Split
Tank Heater
No
Replace Control Assembly
Replace Control Assembly
10420 011599
12
SERVICE (cont.)
Electronic Controls (cont.)
to a temperature sensor. Both components MUST be
replaced as a set.
If the indicator was on or blinking, the temperature sen-
sor is operating properly, proceed to #7.
If the indicator was off, check the sensor connection
on the electronic control circuit board and/or replace
the temperature sensor and the electronic control as-
sembly.
10. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
while the red indicator on the circuit board is on or
blinking.
NOTE - Each temperature sensor is calibrated to an
electronic control assembly. Both components MUST
be replaced as a set.
11. Disconnect the dispenser from the power source.
If voltage was present as described, return the new
triac assembly to Bunn-O-Matic for credit. The tem-
perature control of the system is operating properly.
If voltage was not present as described, reinstall your
existing electronic control assembly and temperature
sensor, and proceed to #12.
7. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
b.) 200 to 240 volts ac for 200 to 240 volt models
while the red indicator on the circuit board is on or
blinking.
12. Replace the triac assembly.
13. Check the voltage across the tank heater terminals
with a voltmeter. Connect the dispenser to the
power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
8. Disconnect the dispenser from the power source.
If voltage was present as described, the temperature
control of the system is operating properly.
If voltage was not present as described, contact Bunn-
O-Matic to order an electronic control assembly, tem-
perature sensor, and triac assembly for evaluation and
proceed to #9.
b.) 200 to 240 volts ac for 200 to 240 volt models
while the red indicator on the circuit board is on or
blinking.
14. Disconnect the dispenser from the power source.
9. Replace the electronic control assembly and tem-
perature sensor.
If voltage was present as described, the temperature
control of the system is operating properly. Return the
new electronic control assembly and temperature sen-
sor to Bunn-O-Matic for credit.
NOTE - Each electronic control assembly is calibrated
10420 011599
13
SERVICE (cont.)
8. Reconnect the wires.
Electronic Controls (cont.)
9. Review the initial set-up procedures.
Electronic Controls Removal and Replacement
Triac Assembly Removal and Replacement
NOTE - Each electronic control assembly is calibrated
toatemperaturesensorprobe.BothcomponentsMUST
be replaced as a set.
NOTE - Each triac installation requires the use of an
approved silicone heat sink compound. Bunn-O-Matic
recommendstheuseofDowCorning340compoundor
equivalent. It can be purchased direct from Bunn-O-
Matic (part # 12572.0002).
1. Remove all wires from the electronic control as-
sembly terminals.
2. Remove the two 8-32 screws holding the electronic
control assembly to the component bracket.
3. Disconnect the temperature sensor, overflow tube
temperature sensor, and indicator wires from the
left side of the electronic control assembly board.
4. Remove the temperature sensor from the grom-
met in the tank lid.
5. Install the new temperature sensor into the grom-
met on the tank lid. Route the wires to the location
of the new electronic control assembly.
6. Attach the temperature sensor, overflow tube tem-
perature sensor, and indicator wires to the elec-
tronic control assembly.
1. Place the tank heater switch on the electronic con-
trol assembly in the “OFF” position.
2. Completely drain the tank.
3. Carefully set the dispenser on its face (faucet side).
4. Remove the four feet attached with four 8-32
phillips-head screws.
5. Remove the bottom panel and four feet attached
with seven 8-32 slotted-head screws.
6. Remove the existing triac assembly held in place
with a 10-32 hex keps nut.
7. Apply a small amount of the silicone heat sink com-
pound to the copper heat sink.
8. Securely fasten the new triac assembly to the bot-
tom of the tank in the same relative position as the
one removed. Bunn-O-Matic recommends tighten-
ing the nut to a torque setting of approximately 18
inch-pounds.
7. Fasten the new electronic control assembly to its
bracket.
BLU to Triac Assy
WHI/BRN to Tank Heater Switch
9. Route the wires up around the rear of the dispenser.
10. Reinstall the bottom panel and four feet.
11. Stand the dispenser upright.
12. Disconnect the other ends of the old triac assem-
bly wires.
13. Connect the TAN and BLU wires with spade termi-
nals of the new assembly to the electronic control
assembly, FIG. 3.
14. Connect the BLU wire with the ring terminal to the
tank heater, FIG. 13.
TAN to Triac Assy
PNK to Liquid Level Probe
WHI or RED to Terminal Block
BLK to Overflow Safety Switch
GRN to Chassis Ground
WHI/BLU to Solenoid
P1774
FIG. 3 WIRING CONNECTIONS
WHI & WHI to
Temperature Sensor
15. Connect the WHI/VIO wire of the new assembly to
the WHI or RED terminal at the terminal block.
PNK & GRY to
Heater Indicator
Refill Indicator
Power Indicator
Ready Indicator
GRY & GRY
toThermistor
P1774
FIG. 4 WIRING CONNECTIONS
10420 011599
14
SERVICE (cont.)
4. Take the temperature of the stream of water imme-
diately below the faucet as it flows from the dis-
penser with an accurate thermometer. Do not take
the temperature of water collected in a container.
Electronic Controls (cont.)
Adjustments
5A. TO INCREASE THE TEMPERATURE
This dispenser can maintain any temperature between
85 and 208°F by selecting and setting one of five vari-
able range control potentiometers.
Turn the potentiometer screw of the temperature
range selected in step 2 in a clockwise direction
with a small screwdriver. One full turn of the screw
will result in an approximate 1°F change. Allow
the temperature to stabilize as described in step 3
and repeat step 4. Continue until the desired water
temperature is achieved.
1. Fill the dispenser according to the steps in the Ini-
tial Set-up.
2. Select the range containing the desired tempera-
ture by plugging the two-pin socket onto the mat- 5B. TO DECREASE THE TEMPERATURE
ing connector of one of the range control boards.
Both pins must be connected to the socket.
Turn the potentiometer screw of the temperature
range selected in step 2 in a counterclockwise di-
rection with a small screwdriver. One full turn of
the screw will result in an approximate 1°F change.
Draw a large quantity of water at the faucet, allow
the temperature to stabilize as described in step 3
and repeat step 4. Continue until the desired water
temperature is achieved.
3. Place the tank heater switch in the “ON” position
and observe the glowing red indicator near the right
edge of the control board. The controller is apply-
ing full power to the heater when the indicator is
on all the time. The indicator will begin to flash as
the temperature nears the set point. The set tem-
perature is reached when the indicator flashes only NOTE - The entire adjustment span is approximately
very briefly. The water is hotter than the set tem- 25 complete revolutions. The potentiometer will cease
perature when the indicator remains off. This ini- to adjust when turned too far in either direction. It is
tial setting will only be an approximation.
not damaged, simply turn it back a few turns and try
again.
85-115°
110-140° 135-165° 160-190° 185-208°
P1775
FIG. 5 TEMPERATURE RANGE SELECTION
10420 011599
15
SERVICE (cont.)
Limit Thermostat
Location:
If voltage was present as described, reconnect the black
wire and proceed to #5.
The limit thermostat is located on the tank lid.
To test the limit thermostat, access will also be needed
to the terminal block located at the rear of the dispenser.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring har-
ness.
5. Check for continuity across the terminals of the
limit thermostat.
If continuity is not present as described, the circuit is
broken. Press the reset button of the limit thermostat
and recheck for continuity.
If continuity is not present as described, replace the
limit thermostat.
P1772
FIG. 6 LIMIT THERMOSTAT
Removal and Replacement:
1. Remove both wires from the limit thermostat ter-
minals.
2. Remove the two #10-32 nuts attaching the limit
thermostat to the top of the tank.
3. Install the new limit thermostat and secure into
place with two #10-32 nuts.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. There are two black wires on the limit thermostat
terminals. One comes from the terminal block. The
other goes directly to the tank heater terminal.
Remove the black wire at the limit thermostat com-
ing from the terminal block.
3. Check the voltage across the black wire removed
from the limit thermostat and the white wire or red
wire of the terminal block with a voltmeter. Con-
nect the dispenser to the power source. The indi-
cation must be:
4. Refer to FIG. 7 when reconnecting the wires.
Reset
BLK to Terminal Block
a.) 100 to 120 volts ac for 100 to 120 volt models
or
BLK to Tank Heater
b.) 200 to 240 volts ac for 200 to 240 volt models.
4. Disconnect the dispenser from the power source.
P1776
FIG. 7 LIMIT THERMOSTAT WIRING
10420 011599
16
SERVICE (cont.)
Removal and Replacement:
1. Disconnect the black wires from the safety over-
flow switch.
Safety Overflow Switch
2. Remove the nut beneath the copper overflow cup.
3. Remove the entire switch assembly from the cup.
4. Place the new switch assembly into the cup, wires
first. Make sure that a gasket is in place around the
threaded switch stem.
NOTE - The magnets must be at the top of the float and
there must be NO stainless steel washers installed for
the safety overflow switch to operate properly.
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P1772
5. Install the nut beneath the copper overflow cup.
Be sure not to overtighten.
6. Reconnect the wires, FIG. 9.
FIG. 8 SAFETY OVERFLOW SWITCH
Location:
The safety overflow switch is located inside the rear of
the dispenser inside the copper overflow cup.
For testing or removal of the safety overflow switch,
access may also be needed by removing the two screws
attaching the electronic control assembly to its mount-
ing bracket.
RED to BLK Wire from
Terminal Block
Test Procedure:
1. Once voltage is verified at the power source, check
for continuity across the safety overflow switch
red wires only until the plastic float is raised and
check that continuity returns when the plastic float
is again lowered.
RED to BLK Wire from
Electronic Control #3
P1777
FIG. 9 SAFETY OVERFLOW WIRING
If continuity is present as described, reconnect each
of the red wires to the black wires, the safety overflow
switch is operating properly.
If continuity is not present as described, replace the
safety overflow switch.
10420 011599
17
SERVICE (cont.)
7. Check the solenoid valve for coil action. Connect
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
sound after approximately 5 seconds, as the coil
magnet attracts the plunger.
Solenoid Valve
Location:
The solenoid valve is located inside the rear of the dis-
penser on the right side near the bottom.
To test the solenoid valve, access will also be needed 9. Reconnect the pink wire to terminal 5 of the elec-
to the electronic control assembly.
8. Disconnect the dispenser from the power source.
tronic control assembly.
If the sound was heard as described and water will not
pass through the solenoid valve, there may be a block-
age in the water line before or after the solenoid valve
or the solenoid valve may require inspection for wear
and removal of waterborne particles.
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If the sound was not heard as described, replace the
solenoid valve.
Removal and Replacement:
P1778
1. Remove all wires from the solenoid valve coil.
2. Turn-off the water supply to the dispenser.
3. Disconnect the water lines to and from the sole-
noid valve.
FIG. 10 SOLENOID VALVE
Test Procedure:
1. Disconnect the dispenser from the power source
and turn-off the water supply to the dispenser.
2. Remove the pink wire from terminal 5 of the elec-
tronic control assembly.
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the
component bracket.
5. Lift-out the solenoid valve.
3. Check the voltage across the solenoid valve coil
terminals with a voltmeter. Connect the dispenser
to the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
6. Remove the two 10-32 slotted-head screws hold-
ing the solenoid valve to its mounting bracket.
7. Securely install the new solenoid valve to its mount-
ing bracket. The direction of flow arrow must be
pointing towards the tank lid.
b.) 200 to 240 volts ac for 200 to 240 volt models
after a delay of approximately 5 seconds.
4. Disconnect the dispenser from the power source.
8. Attach the solenoid valve and mounting bracket to
the component bracket.
9. Securely fasten the water lines to and from the so-
lenoid valve.
If voltage was present as described, proceed to #5.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring har-
ness.
10. Reconnect the wires, FIG. 11.
WHI/BLU to Electronic Control #1
WHI or RED to Terminal Block
5. Remove both wires from the solenoid valve coil
terminals.
6. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
wires and proceed to #7.
If continuity is not present as described, replace the
solenoid valve coil.
P1779
FIG. 11 SOLENOID VALVE WIRING
10420 011599
18
SERVICE (cont.)
Tank Heater
Location:
Removal and Replacement:
The tank heater is located in the tank lid.
1. Remove the wires to the tank heater.
2. Remove the 8-32 nuts from the tank heater flange.
3. Remove the tank heater.
4. Inspect the tank heater gasket and replace if nec-
essary.
5. Securely install the new tank heater. Be certain of a
watertight seal.
6. Reconnect the wires, FIG. 13.
BLU to Triac Assy
BLK to Limit
Thermostat
P1772
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te
n
r
e
C
o
T
h
A
t
W
uto
N
e
a
m
t
e
T
an
a
r
s
FIG. 12 TANK HEATER
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Check the voltage across the terminals of the tank
heater with a voltmeter. Connect the dispenser to
the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models
or
P1780
FIG. 13 TANK HEATER WIRING
b.) 200 to 240 volts ac for 200 to 240 volt models.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, replace the tank
heater.
4. Remove the tank heater from the tank lid and in-
spect it for cracks in the sheath.
If the sheath shows no sign of damage, proceed to #5.
If the sheath is damaged, replace the tank heater.
5. Check for continuity across the tank heater termi-
nals.
If continuity is present as described, reinstall the tank
heater. The tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
10420 011599
19
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM H5X
L1
N
GRN
LIMIT
THERMOSTAT
TRIAC
BLK
BLK
BLU
WHI/VIO
W
H
I
TANK HEATER
TAN
W
H
I
t°
HEATER
REFILL
BLU
7
PNK
WHI/BRN
6
G
R
Y
TANK
HEATER
SW
GRY
PNK
PNK
PNK 20
(PROBE)
5
ELECTRONIC
CONTROL
ASSY
WHI
4
PNK
3
2
1
GRY
GRY
WHI/BLU
GRN
WHI
SOL
POWER
BLK
READY
G
R
Y
G
R
Y
t°
SAFETY
SW
RED
RED
BLK
100-120 VOLTS A C
2 WIRE
SINGLE PHASE
L1
L2
GRN/YEL
LIMIT
THERMOSTAT
TRIAC
WHI/VIO
BLK
BLK
BLU
TANK HEATER
TAN
W
H
I
W
H
I
t°
REFILL
HEATER
BLU
WHI/BRN
7
6
PNK
G
R
Y
TANK
HEATER
SW
GRY
PNK
PNK
PNK 20
(PROBE)
5
RED
RED
ELECTRONIC
CONTROL
ASSY
4
PNK
3
2
1
GRY
GRY
WHI/BLU
GRN/YEL
SOL
POWER
READY
G
R
Y
G
R
Y
t°
SAFETY
SW
BLK
RED
RED
BLK
200-240 VOLTS A C
2 WIRE
SINGLE PHASE
10420 121598
20
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM H5E
L1
N
GRN
LIMIT
THERMOSTAT
TRIAC
WHI/VIO
BLK
BLK
BLU
TANK HEATER
TAN
W
H
I
W
H
I
t°
REFILL
HEATER
BLU
WHI/BRN
7
6
PNK
G
R
Y
TANK
HEATER
SW
GRY
PNK
PNK
PNK 20
(PROBE)
5
4
3
2
1
WHI
WHI
PNK
ELECTRONIC
CONTROL
ASSY
GRY
GRY
WHI/BLU
GRN
SOL
POWER
READY
SAFETY
SW
BLK
RED
RED
BLK
100-120 VOLTS A C
2 WIRE
SINGLE PHASE
L1
L2
GRN/YEL
LIMIT
THERMOSTAT
TRIAC
WHI/VIO
BLK
BLK
BLU
TANK HEATER
TAN
W
H
I
W
H
t°
HEATER
REFILL
BLU
WHI/BRN
7
6
I
PNK
G
R
Y
TANK
GRY
HEATER
SW
PNK
PNK
PNK 20
(PROBE)
5
4
3
2
1
RED
RED
PNK
GRY
ELECTRONIC
CONTROL
ASSY
GRY
WHI/BLU
GRN/YEL
SOL
POWER
BLK
READY
SAFETY
SW
RED
BLK
RED
200-240 VOLTS A C
2 WIRE
1
SINGLE PHASE
10420 121598
21
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