Wells Manufacturing WM-TR Service Manual

WELLS MANUFACTURING COMPANY

2 ERIK CIRCLE, P. O. Box 280

Verdi, NV 89439

Customer Service [phone] Ext.502

fax: [phone]

www.wellsbloomfield.com

SERVICE MANUAL

WATER-MAX

WM-TR

INSTRUCTIONS

WIRING DIAGRAMS

EXPLODED VIEWS

PARTS LIST

705

Includes

SERVICE

IMPORTANT: DO NOT DISCARD THIS MANUAL

This manual is considered to be part of the appliance and is to be given to the OWNER or
MANAGER of the restaurant, or to the person responsible for TRAINING OPERATORS of

this appliance. Additional manuals are available from your WELLS DEALER.

THIS MANUAL MUST BE READ AND UNDERSTOOD BY ALL PERSONS USING OR

INSTALLING THIS APPLIANCE. Contact your WELLS DEALER if you have any

questions concerning installation, operation or maintenance of this equipment.

p/n 503364 Rev. A S705 012803 cps

PRECAUTIONS AND GENERAL INFORMATION

WARNING:

Electric
Shock hazard

All servicing requiring
access to non-insulated
electrical components
must be performed by a
factory authorized
technician.
DO NOT open any access
panel which requires the
use of tools. Failure to
follow this warning can
result in severe electrical
shock.

CAUTION:

Risk of
Damage

DO NOT connect or
energize this appliance
until all installation
instructions are read and
followed. Damage to the
appliance will result if
these instructions are not
followed.

Water-Max™ hot water dispenser is intended for use in
commercial establishments only.

This dispenser is
preparation of food for human consumption. No other use is
recommended or authorized by the manufacturer or its agents.

Operators of this appliance must be familiar with the appliance use,
limitations and associated restrictions.

Operating instructions,
understood by all persons using or installing this appliance.

Cleanliness of this dispenser is essential to good sanitation. Read and
follow all included cleaning instructions and schedules to ensure the
safety of the food product.

Disconnect this appliance from electrical power before performing any
maintenance or servicing.

DO NOT submerge the dispenser or water tank in water. Do not
splash or pour water on, in or over any controls, control panel or wiring.

The technical content of this manual, including any wiring diagrams,
schematics, parts breakdown illustrations and/or adjustment
procedures, is intended for use by qualified technical personnel.

Any procedure which requires the use of tools must be performed by a
qualified technician.

This manual is considered to be a permanent part of the appliance.
This manual and all supplied instructions, diagrams, schematics, parts
breakdown illustrations, notices and labels must remain with the
appliance if it is sold or moved to another location.

This appliance is made in the USA. Unless otherwise noted, this
appliance has American sizes on all hardware.

designed to dispense hot water used in the

warnings and labels must be read and

xi

TABLE OF CONTENTS

PRECAUTIONS & GENERAL INFORMATION xi
SPECIFICATIONS 1
TROUBLESHOOTING SUGGESTIONS 2
SAFETY FEATURES & ERROR CODES 3
TEMPERATURE CALIBRATION 4
CLEANING INSTRUCTIONS 5
DELIMING INSTRUCTIONS 8
SERVICING INSTRUCTIONS 9
WIRING DIAGRAM - DISPENSER 23
EXPLODED VIEWS & PARTS LIST - DISPENSER 24
WIRING DIAGRAM - TANK 25
EXPLODED VIEWS & PARTS LIST - DISPENSER 26

SPECIFICATIONS

Electrical: 208 Volts, Single Phase 35 Amps

240 Volts, Single Phase 35 Amps

NOTE: Requires a dedicated 50 Amp circuit

Plumbing: Water Inlet: 1/4” Male Flare Fitting

Supply: 1/4” Female Flare supplied by a 1/4” O.D. or larger water supply line

NOTE: If water supply run from main supply line to Water-Max™ exceeds 12 feet,
a 3/8” O.D. or larger water supply line is required. Water supply line must be rated for
at least 180ºF.
For higher capacity, hook-up to a hot water line.
DO NOT use a saddle valve to connect to supply line.

IMPORTANT: This dispenser must be installed in compliance with all applicable
federal, state and local codes and ordinances.

Dimensions: Height: 28-11/16”
Width: 10-1/16” (without tank) 15” (with tank installed)
Depth: 22-7/16” (without tank) 25-1/4” (with tank installed)
Weight: 74 lbs. (without tank) 150 lbs. (with tank installed and filled)

1

TROUBLESHOOTING SUGGESTIONS

SYMPTOM

POWER INDICATOR not lit

TANK INDICATOR not lit

STATUS INDICATOR
flashing

No water flow from
dispense nozzle (power
indicator lit, status indicator
not flashing)

INDUCTIVE HEATER
operates intermittently

WATER TANK does not
keep water hot

POSSIBLE CAUSE

Water-Max™ not connected to power

POWER switch OFF

Insufficient water supply

Water tank not installed

Tank not properly seated in receptacle

ERROR detected - water pressure
insufficient

ERROR detected - temperature rise
between inlet and outlet insufficient

RESET Water-Max™: Turn POWER SWITCH OFF. Wait 20 seconds.
Turn POWER SWITCH ON. If unit resets and status indicator comes on
without flashing, error was (probably) a low water condition. Otherwise,
contact your Authorized Wells Service Agency.

Tank is full

Tank is sensed as full, but is actually
low

Tank not properly installed

Internal hi-limit tripping

Cooling fan dirty or obstructed)

Tank not properly installed (TANK
INDICATOR not lit)

Internal damage

SUGGESTED REMEDY

Check POWER PLUG
Check circuit breaker

Press POWER switch to ON

Check water supply turned ON
And supplying at least 25 p.s.i.

Check tank for proper installation

Check tank for proper installation

Check water supply turned ON
And supplying at least 25 p.s.i.

Be sure voltage is maintained
during all phases of operation

Normal operation

Clean water level probe
Replace probe if damaged

Check tank for proper installation

Be sure all cooling openings
and louvers are unobstructed.

Clean cooling fan. Refer to
Servicing Instructions, page 14

Check tank for proper installation

Tank receptacle pins L1 to L2
should read approximately
144Ω

OPERATIONAL NOTES

Water-Max™ will not operate if water pressure is less than 25 p.s.i. If Water-Max™ shuts down (status
light flashes) for no apparent reason, other equipment on the water line may be reducing overall water
pressure and/or volume to Water-Max™.

ERROR CODES are displayed on the control board readout, visible through the view port on the upper
right side of the dispenser. Refer to page 3 for error code meanings and suggested remedial action.

There are no user serviceable components in the appliance. In all cases of damage or component
malfunction, contact your Authorized Wells Service Agency for repairs.

2

SAFETY FEATURES & ERROR CODES

A

A

SAFETY FEATURES

Water-Max™ will not flow water from the dispense nozzle unless the
water tank is in place.

Water-Max™ will not dispense into a full water tank.

The water tank heater will not heat unless the connector on Water­Max™ is fully mated with the tank receptacle. The heater on the water
tank is protected by an over-temp safety switch which will disable the
heater if the tank is allowed to run dry.

Water-Max™ cannot be energized (green power light will not be lit)
unless sufficient inlet water pressure is sensed.

Water-Max™ will go into error mode unless sufficient temperature rise
is sensed between inlet and output water while in the heating mode.

Water-Max™ will go into error mode and stop dispensing after approximately
96 minutes of continuous operation (i.e. 96 minutes without sensing a
“tank full” condition).

ERROR CODES

Open or disconnected INPUT TEMPERATURE
thermocouple.
→ Check connections at control board.
→ Check continuity of input temperature probe*.

Open or disconnected OUTPUT WATER TEMPERATURE
thermocouple.
→ Check connections at control board.
→ Check continuity of output temperature probe*.

Insufficient WATER TEMPERATURE RISE.
Must exceed 14ºF rise in 20 seconds.
→ Verify input water pressure does not exceed 40 p.s.i.
→ Verify input voltage. Delime unit.
→ Check resistance for both thermocouples (2-5 Ω),
plus thermocouple leads to heater (0-2 Ω).
A shorted thermocouple, or one detached from the
heater, will cause an error 4*.

Flow time exceeds 96 minutes of uninterrupted operation. Turn
power off. Wait 20 seconds, turn power back on.

* A short or loss of continuity in either input or output
thermocouple requires replacement of the inductive heater
assembly. Field repair of the heater is not recommended.

CAUTION:

SHOCK HAZARD

Removal of the top, front or
side panels results in
exposed electrical circuits.
Any procedure requiring the
removal of a panel must be
performed by a qualified
technician only.

NOTE: There is a 5 second
delay between the time the
power switch is turned on and
the time Water-Max™ begins
operation.

NOTE: Error codes are
displayed on the control
circuit board readout.

WATER
PROBE

TAN K

FILL

COMMON

PROBE

TYPE K

G2

2

SCR

MODULE

G1

TWL-T-1699- 240

1

INPUT VOLTAGE:
187-264VA C 60HZ
74869 REV.
WELLS/BLOOMFIELD

L1 L2 SOL A SOL B SHUT-DOWN

READOUT
(Error Code)

REV.

To reset an error code,
correct the cause of the error,
then press the power switch
to OFF. After 20 seconds,
turn the power switch back
ON.

NOTE: Initial startup may
require multiple resets of
code 4 condition.

WATER INPUT

TEMP

OFFSET

(+)

YEL

TS

(-)

RED

(+)

YEL

(-)

RED

3

R

CALIBRATING TEMPERATURE

CAUTION:

SHOCK HAZARD

Removal of the top, front or
side panels results in
exposed electrical circuits.
Setting the temperature must
be performed by a qualified

technician only.

Use care whenever working
around exposed electrical
circuits.

NOTE:
Refer to Table 1 below.
The practical maximum
temperature is the local
boiling temperature (based
on the altitude of the
installation) minus 10ºF.
If the stream is “sputtering”,
water temperature is set too
high, allowing steam to form
in the water flow. Set TEMP
OFFSET lower to
compensate.

Remove TOP PANEL. Insert the thermocouple of a digital thermometer
at least 4” into DISPENSER NOZZLE.

Install WATER TANK under DISPENSER NOZZLE. Press POWER
SWITCH to ON.

Run and discard at least one full tank of hot water to allow dispenser
temperatures to stabilize.

Temperature is factory set for 202ºF. Turn TEMP OFFSET on the
CONTROL CIRCUIT BOARD so that temperature on digital
thermometer reads 202ºF.

Press POWER SWITCH to OFF.

Upon completion of temperature adjustment, properly reinstall all
panels.

STATUS

INDICATOR

LED

RED

YELLOW

TANK

COMMON

WATER
PROBE

FILL

PROBE

WATER I NPUT

TYPE K

TANK GROUND

GREEN

TAN K W ATE R
LEVEL PROBE

ORANGE

YELLOW

RED

YELLOW

RED

INLET WATER
TEMPERATURE
SENSOR

OUTLET WATER
TEMPERATURE
SENSOR

(+)
YEL

TS

(-)

RED

(+)

YEL

(-)

RED

READOUT

SCR GATE 2

22 WHITE

SCR A2

24 BLACK

SCR GATE 1

27 ORANGE

SCR A1

23 BROWN

G2

A2

SCR

MODULE

G1

A1

TWL-T-1699-240
INPUT VOLTAGE:
187-264VAC 60HZ
74869 REV.
WELLS/BLOOMFIELD

REV.

TEMP

OFFSET

(Error Code)

CALIBRATE
TEMP

E-MAX™ WM-TR

CONTROLLER

L1 L2 SOL A SOL B S HUT-DOWN

15 BLACK 21 RED 2 3 WHITE 24 BROWN 21 RED BLUE

POWE

INLET VALVES

CONTACTOR

Fig. 7 Control Board

BOILING

0

0

0

5

,

6

POINT OF
WATER

MAXIMUM SAFE
TEMPERATURE
SETTING

)
F

º

(
.
P

200

M
E
T

210

205

195

190

0

0

0

0

0

0

5

0

0

0

5

0

0

,

,

,

1

2

1

0

0

0

5

,

2

0

0

0

0

0

0

5

,

,

,

3

4

3

0

0

0

5

,

4

0

0

0

,

5

0

0

0

0

5

,

,

6

5

ELEVATION (feet above seal level)

Table 1 Boiling Point of Water at Different Altitudes

4

CLEANING INSTRUCTIONS

DAILY CLEANING

PRECAUTIONS: Press POWER SWITCH to OFF (0).

Drain all water from TANK.
Remove tank from Water-Max™.

FREQUENCY: Minimum - Daily, or as required

TOOLS: Soft Cloth, Soft Bristle Brush

CAUTION:

BURN HAZARD

Water in tank is extremely
hot. Use care when draining
tank.

CAUTION:

HOT SURFACES

Exposed surfaces can be hot
to the touch and may cause
burns.

CAUTION:

EQUIPMENT
DAMAGE

DO NOT SUBMERGE TANK
IN WATER!

IMPORTANT:

DO NOT use bleach,
abrasive cleansers or
cleansers containing
chlorides.

Wipe down the exterior of the Water-Max™ with a soft damp cloth.

Use a soft bristle brush to remove any calcium or lime build-up on the
end of the dispensing nozzle. Wipe dispensing nozzle clean with a soft
damp cloth.

Remove TANK LID.

Wipe TANK FAUCET, interior and exterior of tank with a soft damp
cloth. DO NOT SUBMERGE TANK IN WATER!

Fill tank with cool, clean water. Check operation of faucet.
If the faucet leaks:
Drain tank
Disassemble faucet by unscrewing bonnet from faucet body.
Clean or repair faucet as necessary.
Reassemble bonnet on faucet body.

Reinstall TANK LID.

Drain any remaining water from tank and re-install on Water-Max™.

Press POWER SWITCH to ON (I) and test for proper operation.

Procedure is complete.

5

DELIMING INSTRUCTIONS

E

T

E

CAUTION

Burn Hazard

Water in Water-Max™ is
EXTREMELY HOT

OFF

1

GAL

CAUTION

4 OZ

HOT TAP

WATER

USE FUNNEL
FILL BOTTL

MIX

+

HOT

!

2 ½ OZ

LIME-

SHIELD™

WAIT UNTIL

FOAMING STOPS

THEN SWIRL
UNTIL MIXED

DELIMING INSTRUCTIONS

PRECAUTIONS: Water in tank is EXTREMELY HOT (over 200ºF)
Turn Water-Max™ OFF

Drain water from tank before moving.

FREQUENCY: Weekly, or as required when Water-Max™ will not
maintain water at preset temperature.

TOOLS: LIMESHIELD™ Scale and Food Soil Inhibitor
Funnel, Solution Bottle
Scrub Pad (Standard Green)
1 Gallon or Larger Plastic Container (Pitcher)

1. Power switch is located on right side of Water-Max™ base.

Press POWER SWITCH to OFF.

Drain 1 GALLON of water from TANK.

2. Examine SOLUTION BOTTLE for serviceability. If it is cracked or
distorted, replace it with a new bottle.

IMPORTANT: Delime with LIMESHIELD™ Scale and Food Soil
Inhibitor ONLY!

A graduated scoop is provided in the Limeshield™ container.
Measure 1/2 cup (4 ounces) of hot tap water. Pour this into the
1 gallon container.

Measure 1/3 cup (2.5 ounces) of Limeshield™ and pour slowly into
the water in the 1 gallon container.

When foaming stops, swirl solution to insure the
Limeshield™ is completely dissolved.

Use the provided funnel to pour the solution into
the solution bottle.

Dispenser cap is chained to the top of
Water-Max™.

Screw quick-disconnect dispenser cap onto
solution bottle.

3. QUICK-DISCONNECT FITTING is located

on the left top of Water-Max™. Press the
latch until it “clicks” open.

Invert solution bottle. Insert bottle quick-
disconnect fitting into Water-Max™ quick­ disconnect fitting. Press solution bottle
down until the latch “clicks”, locking the
solution bottle in place.

INSER
BOTTL

6

DELIMING INSTRUCTIONS (continued)

E

4. Squeeze solution bottle and force deliming solution into Water­Max™

5. Press latch on tank quick-disconnect fitting until it “clicks” to release

the solution bottle. Lift solution bottle straight up.

Unscrew quick-disconnect cap allowing solution bottle to return to
shape.

Rinse solution bottle with warm tap water. Fill solution bottle
2/3 full of warm tap water and reattach quick-disconnect cap.

After 10 minutes, insert solution bottle in quick-disconnect fitting.
Push down on bottle until latch “clicks”. Squeeze bottle, rinsing
quick-disconnect fittings and forcing deliming solution in Water­ Max™ into the tank.

Press latch on tank quick-disconnect fitting to release the solution
bottle. While pressing button, lift solution bottle straight up. Press
the valve on the solution bottle fitting to allow the bottle to return to
shape. Press the small plunger on the Water-Max™ quick-
disconnect to release the latch. Wipe both quick-disconnect fittings
with a soft cloth.

The quick disconnect fittings are now ready for the next deliming
session.

WAIT

REMOVE
BOTTLE

SQUEEZ

WIPE

QUICK-

DISCONNECTS

10 MIN

RINSE

BOTTLE

THEN

FILL WITH

TAP WATE R

REMOVE
BOTTLE

INSERT &
SQUEEZE

6. Press power switch to ON. Water-Max™ will dispense water and

any remaining deliming solution into tank.

When Water-Max™ stops dispensing, press power switch to OFF.
Allow Water-Max™ to set for I HOUR with deliming solution in
tank.

After I hour, drain pitchers of water from tank until tank is
empty.

Pour all water and solution from tank into a sink or appropriate
container for disposal.

ON

WAIT

1 HOUR

OFF

UNTIL

TAN K

IS

EMPTY

7