Multiplex 2803R04 Service Manual

Soda Systems & SuperChil™

Refrigeration Units

Technician’s

Handbook

This manual is updated as new information and models

are released. Visit our website for the latest manual.

America’s Quality Choice in Refrigeration

Part Number STH12 9/10

www.manitowocfsg.com

Safety Notices

!

Warning

!

Caution

Important

As you work on Manitowoc equipment, be sure to pay
close attention to the safety notices in this handbook.
Disregarding the notices may lead to serious injury
and/or damage to the equipment.

Throughout this handbook, you will see the following
types of safety notices:

Text in a Warning box alerts you to a potential
personal injury situation. Be sure to read the
Warning statement before proceeding, and work
carefully.

Text in a Ca ution box alerts you to a situation in
which you could damage the equipment. Be sure
to read the Caution statement before proceeding,
and work carefully.

Procedural Notices

As you work on Manitowoc equipment, be sure to read
the procedural notices in this handbook. These notices
supply helpful information which may assist you as
you work.

Throughout this handbook, you will see the following
types of procedural notices:

Text in an Important box provides you with
information that may help you perform a
procedure more efficiently. Disregarding this
information will not cause damage or injury, but it
may slow you down as you work.

NOTE: T ext set off as a Note provides you with simple,
but useful, extra information about the procedure you
are performing.

Read These Before Proceeding:

!

Caution

Important

! Warning

We reserve the right to make product

improvements at any time. S pecifications and

design are subject to change without notice.

Proper installation, care and maintenance are
essential for maximum performance and trouble­free operation of your Manitowoc equipment. If
you encounter problems not covered by this
handbook, do not proceed, contact Manitowoc
Foodservice Group. We will be happy to provide
assistance.

Routine adjustments and maintenance
procedures outlined in this handbook are not
covered by the warranty.

PERSONAL INJURY POTENTIAL

Do not operate equipment that has been misused,
abused, neglected, damaged, or altered/modified
from that of original manufactured specifications.

Table of Contents

General Information

Model Numbers . . . . . . . . . . . . . . . . . . . . .9

How to Read a Model Number . . . . . . . . .10

Accessories . . . . . . . . . . . . . . . . . . . . . . .10

Special Applications . . . . . . . . . . . . . . . .11

Model/Serial Number Location . . . . . . . .11

Warranty Information . . . . . . . . . . . . . . . .11

Installation

Pre-installation Checklist . . . . . . . . . . . . .13

Top Mounted Ice Maker Installations . . . 15

S250-M Dimensions . . . . . . . . . . . . . . . . .16

MII-250 Dimensions . . . . . . . . . . . . . . . . .18

MII-302 Dimensions . . . . . . . . . . . . . . . . .20

MII-250 Installation Kit . . . . . . . . . . . . . . .22

MII-302 Installation Kit . . . . . . . . . . . . . . .23

Refrigeration Units . . . . . . . . . . . . . . . . . .25

Safe Installation Dos and Don’ts . . . . . . .28

Location Requirements . . . . . . . . . . . . . .30

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . .34

Plumbing/Water Supply . . . . . . . . . . . . . .38

Preparing Ice Bank – Non-ERC . . . . . . . .39

Preparing Ice Bank with ERC . . . . . . . . .41

Component Identification

Typical System . . . . . . . . . . . . . . . . . . . . .43

Connections . . . . . . . . . . . . . . . . . . . . . . .44

Maintenance

Maintenance Schedule . . . . . . . . . . . . . . .49

Cleaning and Sanitizing the Dispensing

Valves and Product Lines . . . . . . . . . . . .54

Sanitizing . . . . . . . . . . . . . . . . . . . . . . . . .58

Shipping, Storage and Relocation . . . . . 62

Operation

How the Multiplex Works . . . . . . . . . . . . .63

Differences Between the TS & SS Units .64
Equipment Setup Procedure (Non-ERC) 71

Part Number STH12 9/10 5

Start-up (Non-ERC) . . . . . . . . . . . . . . . . . 72

Sequence of Operation (Non-ERC) . . . . 74

Start-up (with ERC) . . . . . . . . . . . . . . . . . 76

Sequence of Operation (with ERC) . . . . 78

Equipment Setup Procedure (with ERC) 82
Equipment Close Procedure — All Units 84

Troubleshooting

Electronic Refrigeration Control (ERC) Model

Error Codes . . . . . . . . . . . . . . . . . . . . . . . 87

Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Problem Cross-reference Guide . . . . . . . 100

Gas System . . . . . . . . . . . . . . . . . . . 101

CO

2

Carbonated Water System . . . . . . . . . . . 104

Circulating System . . . . . . . . . . . . . . . . . 111

Compressed Air System . . . . . . . . . . . . . 112

Dispensing Valve and Tower . . . . . . . . . 114

Electrical System . . . . . . . . . . . . . . . . . . . 119

Refrigeration System . . . . . . . . . . . . . . . . 120

Syrup System . . . . . . . . . . . . . . . . . . . . . . 123

Water Booster System . . . . . . . . . . . . . . 125

Water Filter System . . . . . . . . . . . . . . . . . 127

When the Brix is OFF . . . . . . . . . . . . . . . 128

Component Check Procedures

Test Procedures: MPC 64A Timer/Selection

Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Dual Transformers . . . . . . . . . . . . . . . . . 133

New MPC84A Portion Control Board . . . 134

MOVs Field Testing . . . . . . . . . . . . . . . . . 140

Test Procedures: MPC84C Timer/Selection

Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Back-flow Preventer Maintenance . . . . . 144

Head Pressure Control Valve . . . . . . . . . 145

Charging Multiplex Remote Refrigeration

Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Compressor & Remote Condenser . . . . 148

Agitator Condenser . . . . . . . . . . . . . . . . . 149

Carbonation System A or B . . . . . . . . . . 150

Circulation System A or B . . . . . . . . . . . 151

ERC Control Board, Keypad & Display . 152

Programming / Auto Set . . . . . . . . . . . . . 153

6 Part Number STH12 9/10

ERC Component (Output) Connector Layout

154

ERC Sensor (Input) Connector Layout .154

Component Specifications

Refrigeration Unit Specifications . . . . . . 155

S-250M Specifications . . . . . . . . . . . . . . .156

MII-302 Specifications . . . . . . . . . . . . . . .156

Charts

Refrigerant Charge . . . . . . . . . . . . . . . . . .157

Operating Pressures . . . . . . . . . . . . . . . .161

McDonald’s Models History . . . . . . . . . . .163

Sustained Draw Curve Chart s . . . . . . . . .164

Diagrams

Wiring Diagrams . . . . . . . . . . . . . . . . . . . .167

Soda Wiring Diagrams . . . . . . . . . . . . . . .185

Super-Chil Wiring Diagrams . . . . . . . . . .200

Circuit Schematics . . . . . . . . . . . . . . . . . .212

Ice/Beverage Units Diagrams . . . . . . . . .231

Part Number STH12 9/10 7

8 Part Number STH12 9/10

This Page Intentionally Left Blan k

General Information

Model Numbers

This manual covers the following models:

(A) Air Cooled (W) Water Cooled (R) Remote Cooled

2803A04 2803W04 2803R04

2803AX04 2803WX04 2803RX04

2803A04 2803W04 2803R04

11MA04 11MW04 11MR04

11MAX04 11MAW04 11MRX04

11MA04 11MW04 11MR04
42MA04 42MW04 42MR04

42MAX04T 42MWX04T 42MRX04T

44MA04 44MW04 44MR04
44MAX04T 44MWX04T 44MRX04T
44EAX04T 44EWX04T 44ERX04T

50MA04 50MW04 50MR04

50MAX04 50MWX04 50MRX04

50MA04Q/T 50MW04Q/T 50MR04Q/T

SC180A SC180W SC180R

SC180AX SC180WX SC180RX

SC340A SC340W SC340R

SC340AX SC340WX SC340RX

SC1000A SC1000W SC1000R

SC1000AX SC1000WX SC1000RX

SC2000A SC2000W SC2000R

SC2000AX SC2000WX SC2000RX

Ice/Beverage Dispensers

MII-302 S-250M

Part Number STH12 9/10 9

How to Read a Model Number

Special Configuration

04 - R404a refrigerant

Model Prefix

Model Suffix

Model Base

11M A 04 x

A - Air-cooled
AX - Air-cooled, international
R - Remote
RX - Remote, international
W - Water-cooled
WX - Water-cooled, international

Condenser

Type

2803 & SC180 - 1/3 hp
11M & SC340 - 1/2 hp
44M, 42M & SC1000 - 1 hp
44E - 1 hp, TUV Approved
50M & SC2000 - 2.2 hp

S - Ice/Beverage

Dispenser

MII - Ice/Beverage

Dispenser

M - Multiplex

Ice Capacity

Model Prefix Model Suffix

Model Base

S–250–M

ICE/BEVERAGE MODEL NUMBERS

Accessories

Depending on store type and location, various optional
equipment (such as CO
booster kit, etc.) may be added to this system. Install
and connect any optional equipment in the desired
location according to the installation instructions
provided with these kits/equipment.

10 Part Number STH12 9/10

Panel, water filter kit, water

2

Special Applications

!

Warning

!

Warning

ATTENTION: MARINE INSTALLATIONS

This unit is for use on vessels over 66 ft (20 m) in
length. This unit must not be installed in the engine
space of a gasoline-powered ship.

NOTE: This unit must be secured to the vessel during
installation. Models with part numbers beginning with
the letters TS are NOT marine listed.

OUTDOOR APPLICATIONS

TS Multiplex Beverage Recirculating units are
approved and listed by Underwriters Laboratories
(UL). However they are not UL approved for weather
exposure applications. These units must be installed in
areas where adequate protection from the elements is
provided, all other models are ETL listed.

Personal Injury Potential

Do not operate equipment that has been misused,
abused, neglected, damaged, or altered/modified
from that of original manufactured specifications.

Model/Serial Number Location

These numbers are required when requesting
information from your local Manitowoc Distributor,
service representative, or Manitowoc Foodservice.
The model and serial number are listed on the
OWNER WARRANTY REGISTRATION CARD. They
are also listed on the MODEL/SERIAL NUMBER
DECAL affixed to the unit.

Warranty Information

Consult your local distributor for terms and conditions
of your warranty. Your warranty specifically excludes
all beverage valve brixing, general adjustments,
cleaning, accessories and related servicing.

Part Number STH12 9/10 11

Your warranty card must be returned to activate the
warranty on this equipment. If a warranty card is not
returned, the warranty period can begin when the
equipment leaves the factory.

No equipment may be returned without a written
Return Materials Authorization (RMA). Equipment
returned without an RMA will be refused at the dock
and returned to the sender at the sender’s expense.

Please contact your local distributor for return
procedures.

12 Part Number STH12 9/10

Installation

Pre-installation Checklist

When installing any system, first make sure the major
components are available. Generally the major
components necessary for an installation are:

B-I-B System also:

B-I-B connectors

B-I-B regulator set

B-I-B rack

B-I-B syrup boxes

Bulk Syrup System also:

Syrup connectors for Bulk tank

Gas connectors for Bulk tank

Bulk syrup tanks

Part Number STH12 9/10 13

Post Mix System:

CO2 regulator set

Beverage dispenser

Beverage tubing

CO

tank

2

Carbonator

Stepless (Oetiker) clamps

Chain for CO

tank

2

Double Check:

Do you have enough space to install the
dispenser or a dispenser and top mounted
cuber?

Does top mounted cuber (if utilized) have a
minimum of 6 inches (15.3 cm) clearance on
all sides?

Is the countertop level?

Can the countertop support the weight of the
dispenser, or the dispenser/cuber
combination plus the weight of the stored
ice?

14 Part Number STH12 9/10

Also consider the location of the following items before installa tio n:

Water line

Drain

Power outlet

Heating and air conditioning ducts

Top Mounted Ice Maker Installations

Location — Avoid placing the dispenser

and/or ice machine near heat sources such
as radiators, ovens, refrigeration equipment
and direct sunlight.

Clearances — Six inch (15.2 cm) clearance
on all sides of the icemaker is needed.

Front of icemaker to be flush with front of
dispenser — The front of the icemaker must

be flush with the front of the dispenser. When
the icemaker is flush with the front of the
dispenser, some icemakers may overhang at
the back of the dispenser.

Drains — A separate drain line is required
for the ice machine, in addition to a drain line
for the ice/beverage dispenser.

Dispensers require an adapter kit to install
some top-mounted icemakers. Contact your
local distributor for the correct adapter kit.

Part Number STH12 9/10 15

S250-M Dimensions

I

H

B

A

E

F

G

D

C

A

39.81"

(101.1 cm)

B

30.00"

(76.2 cm)

C

9.94"

(25.2 cm)

D

4.44"

(11.3 cm)

E

22.63"

(57.5 cm)

F

28.00"

(71.1 cm)

G

31.13"

(79.1 cm)

H

20.00"

(50.8 cm)

I

27.44"

(69.7 cm)

16 Part Number STH12 9/10

S250-M FOOTPRINT

A

B

D

C

E

G

I

J

H

F

Minimum Area

for Cutout

Maximum

Area for

Cutout

ABCDE

30.00"

(76.2 cm)

FGHI J

15.00"

(38.1 cm)

26.00"

(66.0 cm)

20.81"

(52.8 cm)

8.00"

(20.3 cm)

3.00"

(7.6 cm)

7.30"

(18.5 cm)

22.81"

(57.9 cm)

11.00"

(27.9 cm)

31.13"

(79.1 cm)

Part Number STH12 9/10 17

MII-250 Dimensions

A

A

39.00"

(99.1 cm)

B

12.50"

(31.8 cm)

C

30.00"

(76.2 cm)

D

1.50"

(3.8 cm)

E

9.94"

(25.2 cm)

F

13.50"

(34.3 cm)

G

20.00"

(50.8 cm)

H

30.50"

(77.5 cm)

K

28.38"

(72.1 cm)

L

22.50"

(57.2 cm)

M

21.69"

(55.1 cm)

N

1.75"

(4.4 cm)

P

28.44"

(72.2 cm)

Front View

Back View

Bottom View

3/8"-16

Thread
Mounting
Holes for

optional

legs

B

C

M

E

F

G

D

H

K

L

P

N

18 Part Number STH12 9/10

MII-250 FOOTPRINT

A
B

C

Maximum Area
for Cutout

D

F

E

3/4" NPT

Fitting

Drainpan

G

H

I

J

3/8"-16

Thread
Mounting
Holes for

Optional

Legs

Minimum

area for

Cutout:

Install

conduit to

the back of
opening to

allow

forward

movement

for service

of flex

manifold.

ABCDE

30.00"

(76.2 cm)

FGHI J

12.00"

(30.5 cm)

26.00"

(66.0 cm)

13.50"
(34.3)

8.00"

(20.3 cm)

22.00"

(55.9cm)

8.00"

(20.3 cm)

24.00"

(61.0 cm)

11.00"

(27.9 cm)

31.00"

(78.7 cm)

Part Number STH12 9/10 19

MII-302 Dimensions

A

33.25"

(84.5 cm)

B

12.50"

(31.8 cm)

C

42.75"

(108.6 cm)

D

1.38"

(3.5 cm)

E

5.59"

(14.2 cm)

F

9.10"

(23.1 cm)

G

12.16"

(30.9 cm)

H

31.00"
(78.7)

J

15.78"

(40.1 cm)

K

28.78"

(73.1 cm)

L

22.50"

(57.2 cm)

M

0.82"

(2.1 cm)

N

26.97"

(68.5 cm)

O

30.47"

(77.4 cm)

P

33.75"

(85.7 cm)

Q

37.16"

(94.4 cm)

B

C

L

K

H

D

E

F

G

J

O

Q

M

N

P

A

20 Part Number STH12 9/10

MII-302 FOOTPRINT

A
B

C

Maximum Area
for Cutout

D

F

E

3/4" NPT Fitting

Drainpan

H

I

J

K

Minimum area

for Cutout: Install

conduit to the back of
opening to allow forward
movement for service of

flex manifold.

Cutouts for Extended
Splash Panel Drain Tube

G

0.50
(1.3)

ABCD

42.75"

(108.6 cm)

EFGH

17.38"

(44.1 cm)

IJK

20.50"

(52.1 cm)

38.75"

(98.4 cm)

12.00"

(30.5 cm)

24.00"

(61.0 cm)

8.00"

(20.3 cm)

8.54"

(21.7 cm)

31.00"

(78.7 cm)

8.00"

(20.3 cm)

12.63"

(32.1 cm)

Part Number STH12 9/10 21

MII-250 Installation Kit

Carb Water to

Left Manifold

Plain Water to

Left Manifold

Syrup Tubes

to Valves

Carb Water to
Right Manifold

Plain Water to

Right Manifold

3/8" ID Tubing

from Conduit (7X)

1/2" ID Tubing

from Conduit (5X)

Use Only for
One Conduit

Plain Water

Line

Use Only for
Two Conduit

Carb Water

Line

Countertop

To Conduit

No. Part Number Description Qty.

1 00854998 Ell 1/2 x 3/8 Barb SS 2
2 00861304 Splicer 3/8 x 3/8 Barb 7
3 00861306 Splicer 1/2 x 1/2 Barb 3
4 5018595 Splicer Elbow SS 1/2 x 1/2 2
5 5030996 Elbow 1/4 x 3/8 Barb SS 7
6 5030997 Elbow 1/4 x 1/2 Barb SS 1
7 5030998 U-bend 1/2 x 1/2 WI - 1/2 Stem 3

22 Part Number STH12 9/10

Carb Water to

Left Manifold

Plain Water to

Left Manifold

Syrup Tubes

to

Valves

Carb Water

to Right

Manifold

Plain Water

to Right

Manifold

3/8" ID Tubing

from Conduit (7X)

1/2" ID Tubing

from Conduit (9X)

Use Only

for One
Conduit

Plain

Water

Line

Use Only

for Two
Conduit

Carb

Water

Line

Countertop

To Conduit

MII-302 Installation Kit

No. Part Number Description Qty.

1 00854998 Ell 1/2 x 3/8 Barb SS 2
2 00861304 Splicer 3/8 x 3/8 Barb 6
3 00861306 Splicer 1/2 x 1/2 Barb 6
4 5011751 Fitting 3/8" Y Barb 1
5 5018595 Splicer Elbow SS 1/2 x 1/2 2
6 5030996 Elbow 1/4 x 3/8 Barb SS 8
7 5030997 Elbow 1/4 x 1/2 Barb SS 4
8 5030998 U-bend 1/2 x 1/2 WI - 1/2 Stem 3

WATER AND SYRUP LINES

This kit facilitates connecting the unit to a 12-16 line
conduit, with one or two carbonated water recirculating
systems, and one or two plain water supply lines, and
maximum 8 syrup product lines.

The unit is shipped with connecting lines terminating
under the unit. It will be necessary to make a 90° turn

Part Number STH12 9/10 23

down through the counter top, to connect to the
conduit. It will also be necessary to fully insulate this
new added section before passing through the counter
top, or before hooking to main conduit.

CARB WATER LINES

• Unit has two carb water lines, one for each flex
manifold.

• Use 2 @ 1/2" x 1/2" elbow and 6-12" of 1/2"
conduit tubing to make connection bend from unit
down through hole in counter top, to mate with
conduit.

• Conduit with only two circulating carb water lines.

• Use two @ 1/2" barb U-bend adapters (invert one)
to connect the two carb circulating lines from
conduit to the two carb water lines from the unit.
Use short 1/2" conduit line to connect the two
U-bends as shown (item #8).

• Conduit with four, two sets of recirculating carb
water lines.

• Use two @ 1/2" barb U-bend adapters, to connect
each set of circulating conduit lines to each carb
water line from unit as shown (8).

PLAIN WATER LINES

• Unit has two plain water lines, one for each flex
manifold.

• Use two @ 3/8" x 1/2" elbows and 6-12" of 1/2"
conduit tubing to make connection bend from unit
down through hole in counter top, to mate with
conduit.

• Conduit with only one plain water line.

• Use one @ 1/2" U-bend adapter, to connect the
two plain water lines to one plain water line from
conduit (item #3).

• Conduit has two plain water lines.

• Use two @ 1/2" straight adapters to connect each
plain water line from unit to each plain water line
from conduit as shown (3).

24 Part Number STH12 9/10

SYRUP LINES

• Unit has eight syrup lines.

• Use seven @ 1/4 x 3/8" and one @ 1/4 x 1/2"
elbows and proper size conduit tubing to make
connection bend from unit down through hole in
counter top, to mate with conduit.

• FULLY INSULATE (no air gaps) and finish with
tape wrap, all these connections from unit, through
90° bend connection and down close to straight
conduit connection. Locate unit properly on
counter, and secure to counter . Finish connections
to conduit with 3/8" x 3/8" and 1/2" x 1/2" straight
barb connectors, and U-bend adapters, as
needed.

• FULLY INSULATE and finish with tape wrap all
these connections to the conduit.

Refrigeration Units

• Refrigeration units require stand or 6" (15.2 cm)
legs. Refrigeration unit cannot be placed directly
on floor.

• Conduit can be run through floor or ceiling chase.

• Syrup supply can be located on stand or adjacent
to refrigeration unit.

CLEARANCES

Control Side (Right) 18" (45.7 cm)
Tower Connection Side (Left) 12" (30.5 cm)
Back Side 6" (15.2 cm)
Ceiling 18" (45.7 cm)

Part Number STH12 9/10 25

REMOTE CONDENSER LINESET REQUIREMENTS

Important

Important

If you have a MAC Multi-Pass condenser please
add three (3) pounds additional charge.

If you exceed the 100ft line set length add
.72oz/ft of line set run (one way) for every foot
over 100ft, to the UNIT charge

1. Both the discharge and liquid remote condensing
lines must be kept to a minimum distance for
maximum performance. All Multiplex systems are
capacity rated to 100 ft (30.5 m) tubing distance
between the compressor and condenser. If you
have another brand condenser, please add
additional charge for the condenser (example: up
to three (3) pounds for a MAC condenser).

2. Any vertical ri se 25 ft (7.62 m) or greater must
have a manufactured or installed trap (bend), in
the discharge refrigeration line from the
compressor to the remote condenser. A trap is
necessary for every additional 25 ft (7.62 m)
vertical rise. When excessive vertical rise exists,
this trap allows oil to reach the condenser and
return to the compressor.

26 Part Number STH12 9/10

3. The easiest method to create a trap is to bend the

To the

Condenser

Discharge Line Trap Every

25 Vertical ft. (7.62 m)

3 ft (.9 m) (minimum) of Discharge

Line Trap at the Compressor

Compressor

3" (7.6 cm) x 6" (15.2 cm)

Maximum Trap Area

Discharge Line

Condenser Trap

tubing (smoothly , no kinks) into the trap form.

4. The trap(s) must be of minimum height of 3"
(7.6 cm) and a width of 6" (15.2 cm) to minimize oil
accumulation. The traps can also be bent out of the
refrigeration tubing. Carefully bend the tubing down
12", and then sweep the tubing back up.

5. It is critical that the remote condensing line size
specifications for the specific model be
maintained. The specifications are 1/2" discharge
and 3/8" liquid lines.

Part Number STH12 9/10 27

Safe Installation Dos and Don’ts

! Warning

!

Warning

! Warning

Read the following warnings before beginning an
installation. Failure to do so may result in
possible death or serious injury.

• Adhere to all National and Local Plumbing
and Electrical Safety Codes.

• Turn OFF incoming electrical service
switches when servicing, installing, or
repairing equipment.

DO NOT throw or drop a CO

•
Secure the cylinder(s) in an upright position
with a chain.

DO NOT store CO

•
above 125°F (51.7°C) near furnaces, radiator

cylinders in temperature

2

or sources of heat.

cylinder.

2

DO NOT connect the CO

the product container. Doing so will result in an

cylinder(s) directly to

2

explosion causing possible death or injury. It is best
to connect the CO

cylinder(s) to a regulator(s).

2

Carbon Dioxide (CO2) displaces oxygen. Exposure
to a high concentration of CO
which are followed rapidly by loss of consciousness
and suffocation. If a CO
particularly in a small area, immediately ventilate the
area before repairing the leak. CO
must not be installed in an enclosed space. An

gas causes tremors,

2

gas leak is suspected,

2

lines and pumps

2

enclosed space can be a cooler or small room or
closet. This may include convenience stores with
glass door self serve coolers. If you suspect CO
may build up in an area, venting of the BIB pumps
and/or CO

28 Part Number STH12 9/10

monitors must be utilized.

2

2

• DO check that all flare fittings are tight. This check
must be performed with a wrench to ensure a
quality seal.

• DO inspect pressure on regulators before starting
up equipment.

• DO protect eyes when working around
refrigerants.

• DO use caution when handling metal surface
edges of all equipment.

• DO handle CO
Secure cylinders properly against abrasion.

• DO store CO

• DO NOT exhaust CO
into an enclosed area, including all types of walk-in

cylinders and gauges with care.

2

cylinder(s) in well ventilated areas.

2

gas (example: syrup pump)

2

coolers, cellars, and closets.

• DO NOT release CO

gas from old cylinder.

2

• DO NOT touch refrigeration lines inside units;
some may exceed temperatures of 200°F
(93.3°C).

NOTE: All utility connections and fixtures must be
sized, installed, and maintained in accordance with
Federal, State, and Local codes.

Part Number STH12 9/10 29

Location Requirements

Number of Dispensing Stations

Business Level* 1 2 3 4

Up to 6 gal / 3 L

of syrup/day or

280 drinks/day

(2,000 gal/yr)

Model 2803

40 ft / 12 m

Maximum

Conduit Length

Model 11M

100 ft / 30 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Up to 12 gal / 45 L

of syrup/day or

560 drinks/day

(4,000 gal/year)

Model 11M

100 ft / 30 m

Maximum

Conduit Length

Model 11M

100 ft / 30 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Up to 21 gal / 79 L

of syrup/day or

980 drinks/day

(7,500 gal/yr)

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Up to 32 gal / 121 L

of syrup/day or

1400 drinks/day

(11,500 gal/yr)

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 44M

250 ft / 80 m

Maximum

Conduit Length

Model 50M

350 ft / 107 m

Maximum

Conduit Length

Model 50M

350 ft / 107 m

Maximum

Conduit Length

Up to 42 gal / 159 L

of syrup/day or

2000 drinks/day

(15,000 gal/yr)

Model 50M

350 ft / 107 m

Maximum

Conduit Length

Model 50M

350 ft / 107 m

Maximum

Conduit Length

Model 50M

350 ft / 107 m

Maximum

Conduit Length

Model 50M

350 ft / 107 m

Maximum

Conduit Length

* Care must be taken when selecting the proper refrigeration unit. Above selections are for 75°F

(24°C) conditions, 16 ounce (470 ml) drinks, and average business cycles. Other factors such as

lunch or dinner peak periods, large drinks, or high ambient conditions may require the next larger

size unit. Contact your Manitowoc Company Author ized Distributor or Manitowoc Bever age Systems

(MBS) for more information.

SODA REFRIGERATION UNIT “QUICK-PICK” SELECTION CHART

30 Part Number STH12 9/10

Select a location for the refrigeration unit that meets
the requirements of the building plans, local codes,
and personnel. The unit must be positioned for free
airflow as well as for future service. The following
minimum requirements must be met:

• 100 GPH (379 LTR/hr) potable water supply
Models 2803/11/38; 200 GPH (757 L TR/hr) potable
water supply Models 44/50

• Beverage quality CO
with a minimum 3/8" (.96 cm) line

gas (bulk or bottled supply)

2

• One Bag-In-Box (BIB) container of each post mix
syrup flavor.

NOTE: Refer to nameplate on side of refrigeration unit
for voltage and amperage specifications. Make all
electrical connections at the junction box located at the
top rear of unit. Optional equipment may require
additional power supplies.

NOTE: Potable water connections to the equipment
must comply with local plumbing code requirements,
particularly the back-flow prevention requirements.

PLUMBING REQUIREMENTS – GENERAL

Incoming water supply must be provided before
installation of the refrigeration unit and must comply
with local plumbing requirements.

1. A minimum 1" (2.54 cm) water supply line with a
manual shut-off valve must be plumbed at least
6 ft (183 cm) from the unit. The incoming water
supply pressure must not exceed 70 psi static
(4.8 bar) and be no less than 40 psi (2.8 bar)
dynamic. If supply water pressure is greater than
70 psi (5 bar), a water regulator will be required.

2. Locate the drain hose, bracket, and two screws
provided in the installation kit. Attach the drain
hose to the water bath overflow tube located on
the bottom of the refrigeration unit.

Part Number STH12 9/10 31

3. Connect the water manifold supply line, located

Screw

Drain Hose

Bottom

of Unit

Bracket

on the bulkhead panel in the motor compartment
to the main water supply. The main water supply
shut-off valve must remain in the OFF position. If
a water filter is to be installed, connect the line to
the outlet fitting of the filter. Plumb according to
applicable plumbing codes.

Drain Hose Connection

4. When a water coole d conde nser is installed, a
copper supply line (not supplied with unit) must be
plumbed to the 3/8" (.965 cm) male flare fitting
installed in the water shut-off assembly. The
shut-off must be placed in the OFF position. A
copper drain line (not supplied) is to be connected
to the outlet fitting of the water cooled condenser
and routed to the floor drain.

32 Part Number STH12 9/10

WATER SUPPLY

1. Use the built in fill valv e that is already plumbed
into the unit.

2. An appropriate floor drain is required within 6 ft
(2 m) of the unit.

3. Potable water connections to the equipment must
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. Verify local plumbing code
requirements.

Part Number STH12 9/10 33

Electrical

! Warning

GENERAL

All wiring must conform to local, state and
national codes.

MINIMUM CIRCUIT AMPACITY

The minimum circuit ampacity is used to help select
the wire size of the electrical supply. (Minimum circuit
ampacity is not the unit’s running amp load.) The wire
size (or gauge) is also dependent upon location,
materials used, length of run, etc., so it must be
determined by a qualified electrician.

ELECTRICAL REQUIREMENTS

Refer to unit’s Model/Serial Plate for
voltage/amperage specifications.

34 Part Number STH12 9/10

SPECIFICATIONS

* Only the model 50M with SS part numbers have 120V components, the TS does not.

Model Volt/Cycle/Phase

Minimum

Circuit Amps

Breaker Compressor

2803 &

SC180

120/60/1

230/50/1

20.3

9.0

25A

16A

1/3 hp

.46 kW

11M &

SC340

120/60/1

230/50/1

21.5

10.7

30A

16A

1/2 hp

.97 kW

44M,

42M &

SC1000

208-230/60/1

230/50/1

20.6

20.6

30A

25A

1 hp

1.9 kW

50M 120* /208-230/60/3

230/400/50/3

25.2

11.6

30A

20A

2.2 hp

2.0 kW

SC2000 208-230/60/3

230/400/50/3

25.2

11.6

20A

15A

2.2 hp

2.0 kW

Part Number STH12 9/10 35

GROUNDING INSTRUCTIONS

! Warning

!

Warning

The unit must be grounded in accordance with
national and local electrical codes.

This appliance must be grounded. In the event of
malfunction or breakdown, grounding provides a path
of least resistance for electric current to reduce the risk
of electric shock.

NOTE: The refrigeration units are not equipped with a
cord.

Improper connection of the equipment-grounding
conductor can result in a risk of electric shock.
The conductor with insulation having an outer
surface that is green with or without yellow stripes
is the equipment grounding conductor. If repair or
replacement of the cord or plug is necessary, do
not connect the equipment-grounding conductor
to a live terminal. Check with a qualified
electrician or serviceman if the grounding
instructions are not completely understood, or if
in doubt as to whether the appliance is properly
grounded. Do not modify the plug provided with
the appliance — if it will not fit the outlet, have a
proper outlet installed by a qualified electrician.

36 Part Number STH12 9/10

!

Warning

When using electric appliances, basic
precautions must always be followed, including
the following:

a. Read all the instructions before using the

appliance.

b. T o reduce the risk of injury , close supervision

is necessary when an appliance is used near
children.

c. Do not contact moving parts.

d. Only use attachments recommended or sold

by the manufacturer.

e. Do not use outdoors.

f. For a cord-connected appliance, the

following shall be included:

• Do not unplug by pulling on cord. To
unplug, grasp the plug, not the cord.

• Unplug from outlet when not in use and
before servicing or cleaning.

• Do not operate any appliance with a
damaged cord or plug, or after the
appliance malfunctions or is dropped or
damaged in any manner. Contact the
nearest authorized service facility for
examination, repair, or electrical or
mechanical adjustment.

g. For a permanently connected appliance —

Turn the power switch to the off position
when the appliance is not in use and before
servicing or cleaning.

h. For an appliance with a replaceable lamp —

Always unplug before replacing the lamp.
Replace the bulb with the same type.

i. For a grounded appliance — Connect to a

properly grounded outlet only. See
Grounding Instructions.

Part Number STH12 9/10 37

Plumbing/Water Supply

PLUMBING POTABLE WATER

Model

2803 &

SC180

11M &

SC340

44M,

42M &

SC1000

50M 40 – 70 psig

SC2000 40 – 70 psig

Required

Water

Pressure

40 – 70 psig

(2.8 – 4.9 bar)

40 – 70 psig

(2.8 – 4.9 bar)

40 – 70 psig

(2.8 – 4.9 bar)

(2.8 – 4.9 bar)

(2.8 – 4.9 bar)

A 1" (2.54 cm) ID copper inlet water line equipped with
a 3/4" (1.905 cm) FPT adapter with shut-off must be
supplied by plumber at rear of equipment. Appropriate
floor drains must be provided within 6 ft (183 cm) of
each unit installed.

NOTE: The carbonator in this unit is provided with a
dual check valve type back-flow preventer, which
conforms to ASSE 1032. The Model 50M & 44M
vented backflow preventer conforms to ASSE 1022.

Potable water connections to the equipment must
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. Verify local
plumbing code requirements.

Drain

Connections

3/4" ID

within 6 ft (2 m)

3/4" ID

within 6 ft (2 m)

3/4" ID

within 6 ft (2 m)

3/4" ID

within 6 ft (2 m)

3/4" ID

within 6 ft (2 m)

Water

Supply

3/8" ID

EVA Line

3/8" ID

EVA Line

1/2" ID

EVA Line

1/2" ID

EVA Line

1/2" ID

EVA Line

38 Part Number STH12 9/10

Preparing Ice Bank – Non-ERC

Drain Tube

Overflow

Tube

Wate r Bath

Tank

Tab

Clamp

BUILDING AN ICE BANK

1. At this time, fill the unit water bath tank to the top,
or within 1/2" (1.3 cm) of the top minimum, of the
overflow tube. Use a garden hose or another
water supply to do this.

NOTE: A manual fill valve is incorporated into the
water circuit to the carbonator tank. This valve can be
used to manually add water lost for any reason. Do not
leave this valve ON constantly, only use it for filling and
topping off. The water bath must be drained, flushed,
and refilled every six months.

2. Turn ON the switch labeled “Refrigeration”. Allow
unit to run for about 15 minutes before proceeding
to step 3.

3. Turn ON the switch labeled “Agitator”.

NOTE: Turn this switch OFF to perform any operations
in the water bath area.

With water bath water temperature of 65°F (18°C), ice
will begin to form on the evaporator coils in
approximately 2 hours. The unit will build a full ice
bank in approximately 4 to 6 hours (depending on
ambient water temperature).

4. Before turning on the carbonator or circulator
switch, verify that the pump box assembly has
been mounted and connected to the unit and the
appropriate syrup and water has been supplied.

Part Number STH12 9/10 39

5. Turn on the main water supply to the booster

Important

assembly. Verify the booster is plugged in and
that the accumulator tank valve is open. (If the
system has an optional “Out-of-Syrup” device,
verify that it is unplugged.)

6. Verify the pump is running. Place the valve on the
right side of the pump box in the purge position
until all air bubbles have passed through the line.
Turn the valve back to “dispense”. Plug the
Out-of-Syrup device power cord into an
appropriate wall outlet at this time (if supplied).

NOTE: Verify that the pump box holding tank is full
before proceeding.

7. Turn on the circulator and carbonator switches.
The carbonator must run for approximately 1 to 3
minutes and shut off. The circulator must run
continuously. Verify that water is returning to the
water bath through the return bulk head fitting.

Wait until a thin layer of ice has begun to form on
the evaporator before proceeding any further.

8. Go to the tower(s) and brix th e valves. Using a
syrup separator and volume cup, adjust the flow
rate of the carbonated water to two fluid ounces
per second. Then, using the separator and a brix
cup, adjust the syrup flow rate for a ratio of
carbonated water to syrup.

40 Part Number STH12 9/10

Preparing Ice Bank with ERC

Drain Tube

Overflow

Tube

Wate r Bath

Tank

Tab

Clamp

BUILDING AN ICE BANK

1. At this time, fill the unit water bath tank to the top,
or within 1/2" (1.3 cm) of the top minimum, of the
overflow tube. Use a garden hose or another
water supply to do this.

NOTE: A manual fill valve is incorporated into the
water circuit to the carbonator tank. This valve can be
used to manually add water lost for any reason. Do not
leave this valve ON constantly, only use it for filling and
topping off. The water bath must be drained, flushed,
and refilled every six months.

2. Main power to unit must be on. Power delay of 30
seconds occurs when power applied. “Pd30”

3. Press COMP/AGIT switch on keypad display.

4. Agitator will come on immediately and
compressor delay will start. “Cd99” will count from
180 to 0.

NOTE: Turn this switch OFF to perform any operations
in the water bath area.

With water bath water temperature of 65°F (18°C), ice
will begin to form on the evaporator coils in
approximately 2 hours. The unit will build a full ice
bank in approximately 4 to 6 hours (depending on
ambient water temperature).

Part Number STH12 9/10 41

5. Turn on the main water supply to the booster

Important

assembly. Verify the booster is plugged in and
that the accumulator tank valve is open. (If the
system has an optional “Out-of-Syrup” device,
verify that it is unplugged.)

6. Verify the pump is running. Place the valve on the
right side of the pump box in the purge position
until all air bubbles have passed through the line.
Turn the valve back to “dispense”. Plug the
Out-of-Syrup device power cord into an
appropriate wall outlet at this time (if supplied).

NOTE: Verify that the pump box holding tank is full
before proceeding.

7. Turn on the circulator and carbonator. The
carbonator must run for approximately 1 to 3
minutes and shut off. The circulator must run
continuously. Verify that water is returning to the
water bath through the return bulk head fitting.

Wait until a thin layer of ice has begun to form on
the evaporator before proceeding any further.

8. Go to the tower(s) and brix th e valves. Using a
syrup separator and volume cup, adjust the flow
rate of the carbonated water to two fluid ounces
per second. Then, using the separator and a brix
cup, adjust the syrup flow rate for a ratio of
carbonated water to syrup to 5 to 1.

42 Part Number STH12 9/10

Typical System

Conduit (In Wall)

6 Valve

Soda

Tower

8 Valve

Soda

Tower

Water Booster

Air

Compressor

Conduit

CO

2

Panel

Multiplex

Refrigeration

Unit

CO

2

Tank

Bag-In-Box

(BIB)

Syrup

BIB

Rack

Water
Filters

BIB Pumps

Component Identification

Part Number STH12 9/10 43

Connections

John Guest Fittings

Drain Hose

Control Switches

1/4" Plastic

CO

2

Line from

Carbonator

Right Hand

Opening for

Conduit Supply

Lines

MODEL 2803 CONNECTIONS

44 Part Number STH12 9/10

MODEL 11M CONNECTIONS

John Guest Fittings

Drain Hose

Control Switches

Opening for

Conduit Supply

Lines

Part Number STH12 9/10 45

MODEL 42, 44, & 50M CONNECTIONS

John Guest Fittings

Drain Hose

Control

Switches

(Non-ERC)

Opening for

Conduit Supply

Lines

ERC Controls

46 Part Number STH12 9/10

ERC CONTROL BOARD OUTPUT CONNENCTIONS

CR

L

L/N

EARTH

AGITATIOR CIRC

CARB A CARB B CIRC A

PLUG THIS PIN

Part Number STH12 9/10 47

ERC CONTROL BOARD INPUT CONNENCTIONS

HIGH PROBE

LOW PROBE

GND

GND

HIGH PROBE

LOW PROBE

HIGH PROBE

LOW PROBE

CO2 TS TD TW TB TA WL ICE CA A CA B

12 11 10 9 8 7 6 5 4 3 2 1

HPCO WATER

COM

+5V DC

OUTPUT

COM

+5V DC

GND

LEVEL PROBE

CIRC A TEMP

CIRC B TEMP

WATER BATH TEMP

DISCHARGE TEMP

SUCTION TEMP

OUTPUT

HPCO SWITCH

48 Part Number STH12 9/10

Maintenance

Maintenance Schedule

This section provides a list of periodic maintenance
tasks and the scheduled frequency required to ensure
the proper operation of your Multiplex dispensing
equipment. To ensure quality beverages, prevent
downtime, and reduce costs, these tasks must be
performed as indicated.

PERIODIC MAINTENANCE FOR SOFT DRINK EQUIPMENT (LISTED BY MAJOR COMPONENTS)

Dispensing stations

Daily (365 times per year)

• Take te mperature of finished drinks. Pour off the

first and take the temperature of the second drink.
The proper temperature of drinks must be 38°F
(4°C) or less.

• Remove nozzles and diffusers from each

dispensing valve. Clean with soap and warm water
(not hot). Rinse with carbonated water and
reinstall.

• Flush all dispenser drains. Pour hot water down

drains at closing.

Beverage conduits

Every 4 months (3 times per year)

• Inspect beverage conduits for damage. Re-

insulate and seal any uninsulated areas.

• Inspect floor chases and seal any open chase

ends.

Air compressor

Monthly (12 times per year)

• Drain condensate water from air compressor tank.

Every 4 months (3 times per year)

• Inspect air compressor filter and repl ace if

clogged. Air filter must be replaced every 6
months.

Part Number STH12 9/10 49

• Inspect air compressor to verify cut-in at 70 psi
(4.8 bar) and cut-out at 90 psi (6.3 bar). Adjust
pressure switch if necessary.

• Inspect system for air leaks and repair as required.

Refrigeration unit

Every 4 months (3 times per year)

• Clean the refrigeration unit air-cooled condenser
using a vacuum cleaner. If equipped with water­cooled condenser, verify the water discharge
temperature is at 105°F (41°C). Adjust water
modulating valve if necessary.

• Inspect water bath to verify water level is at the top
of stand pipe. If below, add water and repair water
makeup device. If excessive amount of water is
flowing over stand pipe, locate leak within bath and
repair.

• Inspect ice bank within the water bath to verify
proper size ice bank and clarity. Look for uniform,
2" to 4" thick ice bank.

• Drain, clean, and refill water bath.

• Inspect agitator motor and ensure proper
operation.

• Inspect the circulating motor/pump assembly.
Clean strainer and oil motor.

• Inspect the carbonating motor/pump assembly.
Clean strainer and oil motor.

• Inspect entire system for leaks and repair as
required.

Water filters

Every 4 months (3 times per year)

• Verify that incoming water pressure is not less than
40 psi (2.8 bar) or greater than 60 psi (4.1 bar). If
equipped with a water regulator, verify proper
setting of 55 psi (3.8 bar). Adjust if necessary.

• If pressure is low, inspect water filter cartridges to
ensure they are able to supply adequate water
pressure under normal system flow. Replace if
unable to provide minimum 20 psi (1.4 bar) under
load.

50 Part Number STH12 9/10

Syrup supply

Daily (365 times per year)

• Clean general area of syrup hookup with soap and
warm water. Rinse off all soap.

Every 4 months (3 times per year)

• Inspect syrup lines for proper flavor identification
labels. Replace labels if necessary.

• Disconnect syrup containers. Clean connector with
soap and warm water. Rinse with plain water and
reconnect to syrup containers.

CO2 gas supply

Every 4 months (3 times per year)

• Inspect pressure setting at CO
regulator. Verify proper 90 psi (6.3 bar) pressure

high pressure

2

setting. Adjust if necessary.

• Inspect pressure setting at syrup pressure
regulators. Verify propter pressure setting. Adjust if
necessary.

• Inspect system for CO

leaks, repair as required.

2

PERIODIC MAINTENANCE FOR SOFT DRINK EQUIPMENT (LISTED BY SCHEDULED FREQUENCY)

Daily (365 times per year)

• Take te mperature of finished drinks. Pour off the
first and take the temperature of the second drink.
The proper temperature of drinks must be 38°F
(4°C) or less.

• Remove nozzles and diffusers from each
dispensing valve. Clean with soap and warm water
(not hot). Rinse with carbonated water and
reinstall.

• Flush all dispenser drains. Pour hot water down
drains at closing.

• Clean general area of syrup hookup with soap and
warm water. Rinse off all soap.

Every 4 months (3 times per year)

• Using Brix cup and syrup separator, check for
proper carbonated water flows (standard flow: 5
oz. in 4 seconds, fast flow: 10 oz. in 4 seconds)

Part Number STH12 9/10 51

and syrup to water ratios at each dispensing
station. Adjust as required.

• Inspect beverage conduits for damage. Re­insulate and seal any uninsulated areas.

• Inspect floor chases and seal any open chase
ends.

• Inspect air compressor filter and repl ace if
clogged. Air filter must be replaced every 6
months.

• Inspect air compressor to verify cut-in at 70 psi
(4.8 bar) and cut-out at 90 psi (6.3 bar). Adjust
pressure switch if necessary.

• Inspect system for air leaks and repair as required.

• Clean the refrigeration unit air-cooled condenser
using a vacuum cleaner. If equipped with water­cooled condenser, verify the water discharge
temperature is at 105°F (41°C). Adjust water
modulating valve if necessary.

• Inspect water bath to verify water level is at the top
of stand pipe. If below, add water and repair water
makeup device. If excessive amount of water is
flowing over stand pipe, locate leak within bath and
repair.

• Inspect ice bank within the water bath to verify
proper size ice bank and clarity. Look for uniform,
2" to 4" thick ice bank.

• Drain, clean, and refill water bath.

• Inspect agitator motor and ensure proper
operation.

• Inspect the circulating motor/pump assembly.
Clean strainer and oil motor.

• Inspect the carbonating motor/pump assembly.
Clean strainer and oil motor.

• Inspect entire system for leaks and repair as
required.

• Verify that incoming water pressure is not less than
40 psi (2.8 bar) or greater than 60 psi (4.1 bar). If
equipped with a water regulator, verify proper
setting of 55 psi (3.8 bar). Adjust if necessary.

52 Part Number STH12 9/10

• If pressure is low, inspect water filter cartridges to
ensure they are able to supply adequate water
pressure under normal system flow. Replace if
unable to provide minimum 40 psi (1.4 bar) under
load.

• Inspect syrup lines for proper flavor identification
labels. Replace labels if necessary.

• Disconnect syrup containers. Clean connector with
soap and warm water. Rinse with plain water and
reconnect to syrup containers.

• Inspect pressure setting at CO
regulator. Verify proper 90 psi (6.3 bar) pressure

high pressure

2

setting. Adjust if necessary.

• Inspect pressure setting at syrup pressure
regulators. Verify propter pressure setting. Adjust if
necessary.

• Inspect system for CO

leaks. Repair as required.

2

Part Number STH12 9/10 53

Cleaning and Sanitizing the Dispensing Valves and Product Lines

MAINTENANCE SCHEDULE

Every day

Dispensing
valves

Drip pan and
drain hose

Quick
disconnects

Weekly

Outside,
dispenser
cabinet

Every 3 months

Syrup
circuits

Water bath Drain, melt ice and clean using

Every 6 months

Condenser Vacuum fins or use soft bristle brush

Air purifier
filter (if
equipped)

Remove nozzles and diffusers and
soak in mild detergent cleaning
solution. Scrub parts with small bristle
brush taking care to clean small
crevices and O-ring grooves. Turn
OFF power to dispensing valves.
Scrub exterior surfaces, including
bottom splash area and actuator
lever, with cleaning solution.
Reassemble diffusers and nozzles.
Wipe dry exterior surfaces before
turning ON power.

Wash with mild detergent. Rinse with
clean water.

Wash with mild detergent. Rinse with
potable water.

Wash with clean water and mild
detergent. Wipe dry.

Sanitize each syrup circuit. See
“Cleaning and Sanitizing Procedure”.

detergent and brush; rinse with
potable water. Do not use water over
140°F (60°C).

(scrub brush).
Replace.

54 Part Number STH12 9/10

CLEANING EQUIPMENT AND SUPPLIES

• Recommended cleaner: Any caustic-base (low
sudsing, non-perfumed, easily rinsed) detergent
solution which provides a minimum 2% sodium
hydroxide. The solution must be prepared in
accordance with the manufacturer’s instructions.
Solution temperature must be between 90°F
(32°C) and 110°F (43°C). Temperatures in excess
of this can cause internal damage to the
dispensing valve components.

• Recommended sanitizer: Any sanitizer which
provides a minimum of 120 parts per million
(120 milligrams per liter) of available chlorine.
Solution temperature must be between 90°F
(32°C) and 110°F (43°C). Temperatures in excess
of this can cause internal damage to the
dispensing valve components.

• Two five gallon (figals) syrup tanks and fittings,
cleaned and sanitized (one for cleaner; one for
sanitizer)

• Containers for cleaner and sanitizer solutions

• Clean, non-abrasive cloths

• Buckets

• Small Brush

• Extra Nozzles

• Extra Jumpers

Part Number STH12 9/10 55

CLEANING AND SANITIZING PROCEDURE

!

Caution

NOTE: Cleaning and sanitizing is not required for
potable water circuits. Potable water lines must remain
connected and operational during the cleaning and
sanitizing procedures for syrup circuits.

It is required that the Carbonated Water Lines
remain connected and operational during
cleaning and sanitizing of the syrup circuits.
Sanitizing of the valve without the Carbonated
Water side operation may leave bacteria in the
nozzle, diffuser, and syrup tube.

Cleaning and dispensing valves

1. Disconnect each syrup container from its product
line. Remove product from the lines by purging
with clean warm tap water until syrup has been
fully purged from the product lines and valves.

2. Clean all lines and fittings with cleaning solution
and rinse with clean, room temperature water to
remove all traces of residual product.

Cleaning the product lines

1. To clean each valve product line, attach the valve
product lines to the pressure tank containing the
cleaning solution. Make sure each line is
completely filled. Pressurize the lines by pulsing
the valves.

Pressurizing the product lines

A. For 15 seconds turn dispensing valve ON,

OFF, and then immediately ON again for 15
cycles.

B. Allow the valve to remain flowing for 3

minutes.

C. Repeat pulsing and flowing the valves again

until all cleaning solution has been used.

56 Part Number STH12 9/10

!

Caution

Do not allow cleaning and sanitizing solutions to

remain in syrup systems longer than
recommended contact time. Exceeding contact
time will result in damage to valve components.

2. Flush the cleaning solution from the lines with
clean water after a minimum of 3 minutes, by
pulsing the valves as described above.

3. Remove the nozzles and the diffuser assemblies
from the valves. Clean with cleaning solution.
Agitate the assemblies to ensure assemblies are
clean. Place them in a container of sanitizing
solution for 15 minutes. Wearing sanitary gloves,
remove the nozzles and diffuser assemblies from
the sanitizing solution. Drain each until dry and
reassemble to the valves.

4. Attach each valve product line to the pressure
tank containing the sanitizing solution. Be sure all
connections are cleaned and sanitized before
connecting to each product line.

5. Pressurize and fill the lines with sanitizing
solution. Make sure lines are completely filled,
Allow the sanitizing solution to flow through each
valve while activating the valves for 15 cycles.

A. Leave valves OFF and allow to stand

pressurized for 30 minutes.

B. Activate the valves for two (2) cycles. Flush

remaining sanitizer continuously through the
valves.

6. Reconnect the syrup containers to their
respective circuits. Prepare the unit for operation.

7. Draw drinks to refill lin es and flush the sanitizing
solution from the dispenser. Taste the beverage to
verify that there is no off-taste (chlorine).

Part Number STH12 9/10 57

Sanitizing

! Warning

! Warning

BEVERAGE SYSTEM CLEANING

Flush sanitizing solution from syrup system.
Residual sanitizing solution left in system could

create a health hazard.

When using cleaning fluids or chemicals, rubber
gloves and eye protection must be worn.

Sanitize the beverage system at initial start-up as well
as regularly scheduled cleaning. The drain pan must
be in place under soda valves, to carry away detergent
and sanitizing agents that will be flushed through
valves.

BAG-IN-BOX SYSTEM SANITATION
The procedure below is for the sanitation of one

syrup circuit at a time. Repeat to sanitize
additional circuits.

You will need the following items to clean and sanitize
the Bag-in-Box (BIB) beverage system:

• Three (3) clean buckets

• Plastic brush or soft cloth

• Mild detergent

• Unscented bleach (5% Na CL O) or
Commercial sanitizer

• Bag-In-Box bag connector

1. Prepare the following in the buckets:

• Bucket 1 — warm to hot tap water for rinsing.

• Bucket 2 — mild detergent and warm to hot
water.

58 Part Number STH12 9/10

• Bucket 3 — mix a solution of unscented

Bag
side

connector

bleach (5% Na CL O) or commercial sanitizer
and warm to hot water. Mixture should supply
100 PPM available chlorine (1/4 oz. bleach to
1 gallon water).

2. Disconnect the “syrup-line side” of the BIB
connector.

3. Rinse connector with warm tap water.

Part Number STH12 9/10 59

4. Connect syrup connector to BIB connector and
immerse both into Bucket 1. A “bag-side”
connector can be created by cutting the connector
from an empty disposable syrup bag.

5. Draw rinse water through system until clean water
is dispensed. Most beverage valves allow the
syrup side to be manually activated by depressing
the syrup pallet.

6. Connect Bucket 2 to system.

7. Draw detergent solution through system until
solution is dispensed.

8. Repeat steps 2-7 until all syrup circuits contain
detergent solution.

9. Allow detergent solution to remain in the system
for 5 minutes.

10. Connect Bucket 3 to system.

11. Draw sanitizing solution through system until
solution is dispensed.

12. Repeat step 11 until all syrup circuits contain
sanitizer solution.

13. Allow sanitizer solution to remain in system for 15
minutes.

14. Remove nozzles and di ffusers from beverage
valves.

15. Scrub nozzles, diffusers and all removable valve
parts (except electrical parts) with a plastic brush
or a soft cloth and the detergent solution.

16. Soak nozzles, diffusers and removable valve
parts (except electrical parts) in sanitizer for 15
minutes.

17. Replace nozzles, diffusers and valve parts.

18. Connect Bucket 1 to system.

19. Draw rinse water throug h system until no
presence of sanitizer is detected.

20. Attach syrup connectors to BIBs.

21. Draw syrup through system until only syrup is
dispensed.

22. Discard first 2 drinks.

60 Part Number STH12 9/10

FIGAL BEVERAGE SYSTEM

1. Prepare the following in three clean Figal tanks:

• Rinse tank - fill with room temperature tap
water.

• Detergent tank - mix approved beverage
system cleaner with warm water as directed.

• Sanitizing tank - mix a solution of un sce nted
bleach (5% Na CL O) or commercial sanitizer
and warm to hot water. Mixture should supply
100 PPM available chlorine (1/4 oz. bleach to
1 gallon water).

2. Disconnect all product and water lines from
product tanks and remove carbonator.

3. Locate the Figal syrup tank for the circuit to be
sanitized. Remove both quick disconnects from
the Figal syrup tank. Rinse quick disconnects in
tap water.

4. Connect rinse tank to the syrup line. Draw clean
rinse water through the valve until syrup is flushed
from the system.

5. Connect detergent tank to the syrup line and draw
detergent through the valve for two minutes.
Then, allow remaining detergent to stay in the
system for five minutes.

6. Connect rinse tank to the syrup line. Draw clean
rinse water through the valve until detergent is
flushed from the system.

7. Remove valve nozzle and diffuser as shown in
Daily Cleaning instructions. Using a plastic brush
or a soft cloth and warm water, scrub the nozzle,
diffuser, bottom of the dispensing valve and cup
lever, if applicable.

8. Place removable valve parts (EXCEPT solenoids)
in sanitizing solution for 15 minutes.

9. Replace valve diffuser and nozzle on the
beverage valve.

10. Connect sanitizer tank to the syrup line and draw
sanitizer through the valve for two minutes. Allow
sanitizer to remain in the system for a minimum of
15 minutes.

Part Number STH12 9/10 61

11. Reconnect syrup and carbonated water lines.

!

Caution

12. Draw syrup through the lines to rinse the system.
Discard drinks until at least two cups of
satisfactory tasting beverage are dispensed
through the valve.

Shipping, Storage and Relocation

Before shipping, storing, or relocating this unit,
syrup systems must be sanitized. After sanitizing,
all liquids (sanitizing solution and water) must be
purged from the unit. A freezing environment
causes residual sanitizing solution or water
remaining inside the unit to freeze, resulting in
damage to internal components.

62 Part Number STH12 9/10

Operation

How the Multiplex Works

Model 2803 — a 1/3 HP refrigeration unit that will provide

pre-mix carbonated beverages and chilled carbonated water
for up to 6 gal (3 L) of syrup/day or 280 drinks/day (2,000 gal/yr)
with a 40 ft (12 m) maximum conduit length. This is a remote
refrigeration unit that derives its peak draw capacity from the
reserve ice bank produced from a capillary tube refrigeration
system. This system is controlled to cycle ON and OFF by the
operation of the ice bank control. The sensing bulb that controls
the ice bank is located on an adjustable bracket in the water
bath.

Model 11M — a 1/2 HP refrigeration unit that will provide
premix carbonated beverages and chilled carbonated water for
up to 12 gal (45 L) of syrup/day or 560 drinks/day (4,000
gal/year) with a 100 ft (30 m) maximum conduit length. This is
a remote refrigeration unit that derives its peak draw capacity
from the reserve ice bank produced from a capillary tube
refrigeration system. This system is controlled to cycle ON and
OFF by the operation of the ice bank control. The sensing bulb
that controls the ice bank is located on an adjustable bracket in
the water bath.

Model 42M — a 1 HP refrigeration unit that will provi de pre-mix
carbonated beverages and chilled carbonated water for up to
50 gal (190 L) of syrup/day or 3,060 drinks/day (18,200 gal/yr)
with a 250 ft (80 m) maximum conduit length. This refrigeration
unit is a remote refrigeration unit that derives its peak capacity
from the reserve ice bank produced from a TXV system. This
system is controlled to cycle ON and OFF by the operation of
the ice control. The sensing probe that controls the ice bank, is
located on an adjustable bracket in the water bath.

Model 44M — a 1 HP refrigeration unit that will provi de pre-mix
carbonated beverages and chilled carbonated water for up to
50 gal (190 L) of syrup/day or 3,060 drinks/day (18,200 gal/yr)
with a 250 ft (80 m) maximum conduit length. This refrigeration
unit is a remote refrigeration unit that derives its peak capacity
from the reserve ice bank produced from a TXV system. This
system is controlled to cycle ON and OFF by the operation of
the ice control. The sensing probe that controls the ice bank, is
located on an adjustable bracket in the water bath.

Part Number STH12 9/10 63

Model 50M — a 2.2 HP Pre-mix refrigeration unit that will

• The TS uses common components from Manitowoc Ice makers
to assist in product and parts availability.

provide pre-mix carbonated beverages and chilled carbonated
water for up to 42 gal (159 L) of syrup/day or 2,000 drinks/day
(15,000 gal/yr) with a 350 ft (107 m) maximum conduit length.
This refrigeration unit is a remote refrigeration unit that derives
its peak capacity from the reserve ice bank produced by the
operation of the compressor. This system is controlled to cycle
ON and OFF by the operation of the ice bank control. The
sensing bulb that controls the ice bank is located on an
adjustable bracket in the water bath.

Differences Between the TS & SS Units

Multiplex soda and water chillers may have three
different series numbers. Starting in 2007 some no
longer begin with an “SS”; they now begin with a “TS”.
Starting in 2008, units with ERC (Electronic
Refrigeration Controls) end with an “E”. The following
shows you how to tell the difference between the TS
version and the SS.

64 Part Number STH12 9/10

• The TS compressor is mounted with bolts instead of studs.

• TS remote and water-cooled back panel connections
are offset to protect fittings.

Part Number STH12 9/10 65

WATER MANIFOLD TS

• TS air-cooled condenser comes standard with a filter.

Two Stainless Steel log style

manifolds

• One regulated supply for
carbonator pumps.

• One unregulated supply for
non-carb drinks and water
bath fill.

Other Connections

• Connections are made in the
water bath compartment.

• Separate plain water manifold
eliminates need to plug off
during installation.

66 Part Number STH12 9/10

ELECTRICAL TS

• Electrical compartment has been moved up on the unit to eliminate
water intrusion potential from the pump compartment.

• All components are now 208/230V. This eliminates the need for a
neutral wire.

• New unit has service connections in the electrical compartment.
Allows more room to work and more reliable connection.

• Pump protection switch has been moved to the pump
compartment to eliminate potential leak point in electrical
compartment.

Part Number STH12 9/10 67

WATER BATH ACCESS SS

• Has a round hole in the front and back panels with
no edge trim to protect lines.

• End panel has two ovals in the rear of the panel with

edge trim to help protect conduit lines.

• All panels have large oval access holes with interchangeable
covers.

• Front panel has 3 hole cover for water and CO

2

line routing.

• Back panel has solid cover.

• End panel has one open cover and one solid cover.

• Open cover provides wide ledge for conduit line protection.

WATER BATH ACCESS TS

68 Part Number STH12 9/10

SERVICE ACCESS SS

• Front panel was solid and did not allow easy access for service.

• Switch panel was mounted flush to end panel.

SERVICE ACCESS TS

• Front panel is split to allow front access to the compressor
compartment.

• Switches are recessed and the edge has trim panel to protect
fingers from sheet metal edges.

Part Number STH12 9/10 69

SERVICE ACCESS TS WITH ERC

LED Display

Service Switch

Program

Switch

SER

PGM

CIRC

B

COMP/
AGIT

CARB A CARB B CIRC A CIRC B

• Service Switch — (SER) switch, press to send ID on power line
network.

• Wink Function — LED flashes “Ion” to indicate wink function. Press
program switch (PGM) to disable wink function.

70 Part Number STH12 9/10

Equipment Setup Procedure (Non-ERC)

1. Ensure that all valve nozzles are attached to the
valves.

2. Observe pressure of CO2 high pressure tank of
500 psi (34 bar) or more, or bulk CO
150 psi or more. Primary regulator set at 90 psi
(6 bar) and the secondary regulator set at 35 psi
(2.4 bar).

3. Observe the contro l panel to verify that al l
pressure gauges are set at correct operating
pressures.

4. Check the syrup tanks to make sure a sufficient
number of tanks are connected in series to satisfy
business volume.

5. Clean syrup inlet and outlet quick disconnects at
the same time tanks are replaced. Rinse
disconnects in clean potable water.

tank of

2

Part Number STH12 9/10 71

Start-up (Non-ERC)

1. Fill the refrigeration unit water bath tank with
water to within 1/2" (1.27 cm) of the top of the
overflow tube.

2. Open the manual water shut-off valve to the water
cooled condenser (if applicable).

3. Turn ON the rocker switch labeled “Refrigeration”
to begin building an ice bank.

4. Turn ON the rocker switch labeled “Agitator”.

NOTE: On TS units 3 & 4 are combined into 1 switch.

5. Ice will begin to form on the evaporator coils in
approximately 2 hours.

6. The refrigeration unit will build an ice bank in
approximately 4 to 6 hours.

7. If optional CO
installed on the refrigeration unit, refer to the
installation instructions for operation and testing
the circuits for leaks.

8. The carbona tion circuits “A” and “B,” as well as
the syrup circuits must be checked for leaks and
possible cross circuits before turning ON the
water supply to carbonator pumps.

9. Turn on main water supply. Set incoming
regulator to 55 psi on the CO
Model 11M root beer system’s internal regulator
(must be lower than CO2 supply pressure). Once
water is supplied to the unit, air needs to be
purged from the carbonator tank. Do so by lifting
press relief valve tab until water comes out of
relief valve.

10. Turn on main CO
90 – 100 psi. For the Model 11 Root Beer system,
set regulator initially to 26 psi; it can be raised
incrementally to 30 psi if there is excessive
foaming.

11. Set bag-in-box syrup tank push pressure CO
regulator to 65 – 70 psi. For the Model 11 Root
Beer system, set push pressure CO
35 – 40 psi.

/Water Control Panel has been

2

panel; 25 psi for the

2

supply. Set regulator initially to

2

regulator to

2

2

72 Part Number STH12 9/10

PLACING THE CARBONATION SYSTEM IN OPERATION

1. Open the CO
bulk tank. Adjust the CO
(6.2 bar).

gas supply valve at CO2 tanks or

2

pressure to 90 psi

2

2. Open relief valve on top of the carbonator tank for
4 seconds to bleed off air in tank.

3. Turn ON the water supply to unit.

4. Turn ON the switch labeled “Carbonator Pump”.
Allow carbonator to run and cycle OFF.

5. Activate all valves until a smooth, continuous flow
of carbonated water and non-carbonated water
appear at the valves.

6. Turn ON switch labeled “Circulator”.

7. Allow at least 1 hou r before proceeding to
calibration instructions. You may complete the
sanitizing instructions during this period.

Part Number STH12 9/10 73

Sequence of Operation (Non-ERC)

PRE-MIX REFRIGERATION UNIT
Ice Bank Is Required

1. Check water bath for full ice bank.

2. The stabilized water bath operating temperature
must be maintained at 33°F (0.6°C) to 35°F
(1.7°C).

The following is a sequence of operations for the
Multiplex Pre-mix Beverage equipment.

1. Once a drink is dispensed, the following will
occur:

A. For a Syrup Tank System, the Pre-mix syrup

is manually mixed at the store. Pre-mix
beverage is then transferred to a holding tank
for supply to the Multiplex system.

B. For a Bag-In-Box System, pre-mix syrup is

drawn from a Bag-In-Box by means of a gas
driven syrup pump.

2. The carbonator pump (stainless) pulls the 5:1
pre-mix out of the 3 gallon holding tank and injects
it into the pre-mix carbonator tank where the CO
pressure is 35 psi (2.4 bar) on the tank.

3. The circulator pump runs continuously and
circulates water bath water through the conduit to
provide cooling for all drinks.

2

74 Part Number STH12 9/10

Multiplex Pre-mix Beverage System Operation

Conduit (In Wall)

6 Valve

Soda

Tower

8 Valve

Soda

Tower

Water Booster

Air

Compressor

Conduit

CO

2

Panel

Multiplex

Refrigeration

Unit

CO

2

Tank

Bag-In-Box

(BIB)

Syrup

BIB

Rack

Water
Filters

BIB Pumps

Part Number STH12 9/10 75

and Layout

Start-up (with ERC)

PLACING EQUIPMENT IN OPERATION

Before placing equipment in operation, verify that all
requirements for roof mounted Remote Condenser
Units (if applicable) have been satisfied. Refer to the
instructions on installing the Remote Condenser.
Verify proper supply power to unit.

1. Fill the refrigeration unit water bath tank with
water to within 1/2" (1.27 cm) of the top of the
overflow tube.

2. Open the manual water shut-off valve to the water
cooled condenser (if applicable). Refer to
“Electronic Control” for control programming
sequence.

3. Press “Comp/Agit” to begin building an ice bank.

4. Ice will begin to form on the evaporator coils in
approximately 2 hours.

5. The refrigeration unit will build an ice bank in
approximately 4 to 6 hours.

6. If optional CO
installed on the refrigeration unit, refer to the
installation instructions for operation and testing
the circuits for leaks.

7. The carbona tion circuits “A” and “B,” as well as
the syrup circuits must be checked for leaks and
possible cross circuits before turning ON the
water supply to carbonator pumps.

8. Turn on main water supply. Set incoming
regulator to 55 psi on the CO
panel. Once water is supplied to the unit, air
needs to be purged from the carbonator tank. Do
so by lifting press relief valve tab until water
comes out of relief valve.

9. Set bag-in-box syrup tank push pressure CO
regulator to 60 psi.

/Water Control Panel has been

2

/Water control

2

2

76 Part Number STH12 9/10

PLACING THE SYRUP SYSTEM IN OPERATION

1. Open the CO
bulk tank. Adjust the CO
(6.2 bar).

gas supply valve at CO2 tanks or

2

pressure to 90 psi

2

2. Open relief valve on top of the carbonator tank for
4 seconds to bleed off air in tank.

3. Verify the water supply to unit is on.

4. Press the switch labeled “Carb A” (and B if
applicable). Allow carbonator to run and cycle
OFF.

5. Press the switch labeled “CIRC A” (and “CIRC B”
if applicable).

6. Activate all vales un til a smooth, continuous flow
or carbonated water and non-carbonated water
appear at the valves.

7. Allow at least 1 hou r before proceeding to
calibration instructions. You may complete the
sanitizing instructions during this period.

Part Number STH12 9/10 77

Sequence of Operation (with ERC)

ELECTRONIC CONTROL
Prerequisites

• Potable water must be connected to the
carbonator pump circuit.

• The ice bank water bath water must cover the
evaporator. The compressor will not start unless
the ice bank control probes are immersed in water.

•CO

Initial Power-up

The control has a 30-second delay when power is
connected, or disconnected and reconnected. The
display will show Pd30 - power delay and 30 seconds
left in the countdown cycle.

Normal Two Circuit Operation

Pressing the COMP/AGIT button will start the water
bath agitator immediately and initiate the 180 second
compressor delay. The display will show Cd99
(compressor delay & 99 seconds) and will start to
count down from 99 seconds after the first 81 seconds
have elapsed. After 180 seconds the compressor and
condenser fan motor energize and the COMP/AGIT
LED flashes. Pressing the CARB A and CARB B
buttons will power the carbonator tank liquid level
control. The corresponding LED flashes to indicate the
pump is running. Pressing the CIRC A & CIRC B
buttons will immediately energize the circulating
pumps and energize the LED constantly. The display
will show the circulating temperature and show the A
circuit. When two circuits are used the readout will
alternate between A and B circuits every 5 seconds.

The compressor and condenser fan will continue to
run until ice contacts the ice bank control probe closest
to the evaporator. When ice contacts the probe, the
COMP/AGIT LED lights constantly and the
compressor and condenser fan motor de-energize.

As the ice bank melts, the ice bank control probe will
lose contact with the ice; the LED will flash and the
compressor and condenser fan motor will restart. This
cycle will repeat as required depending on load.

must be supplied.

2

78 Part Number STH12 9/10

Power Interruption

SER

PGM

CIRC

B

CIRC

A

COMP/

AGIT

CARB

A

CARB

B

CIRC

A

CIRC

B

During a power interruption the control will resume
from the point of interruption when power is reapplied
and the time delay expires. Any switches/components
that were energized when power was interrupted will
be energized when power is reapplied.

Error Codes

E1 = Low Water Supply Pressure
E2 = Low CO

Pressure

2

E3 = Low Water Level - Water Bath
E4 = High Water Bath Temperature
E5 = High Water Supply Pressure
E6 = High Refrigeration Temperature
E7 = High Ice Bank Size (Probe Sensor 2)
E8 = Long Carb A Run Time
E9 = Long Carb B Run Time

NOTE: Shorted Transducer = "----"

Open Transducer = "===="

Error codes will display until corrected.

Control Programming

SER Switch

• For when optional LON communication network is
connected.

Part Number STH12 9/10 79

PGM Switch

• Used to enter and exit programming modes.

• Press PGM Switch F000 will display

• Press and hold Carb A switch — Display will
indicate Water Bath Temperature

• Press and hold Circ A switch — Display will
indicate Discharge Temperature

• Press and hold Circ B switch — Display will
indicate Suction Temperature

• Press PGM Switch P000 will display

• Press and hold Carb A switch — Display will
indicate Water Pressure

• Press and hold Carb B switch — Display will
indicate CO2 Pressure

Press and hold PGM switch for 3 seconds to save
settings and exit program mode.

Program Mode 1

To enter, press and hold switch for 3 seconds.

• 0001 will display indicating Mode 1

• Wait 3 seconds — C000 will display

• Press and hold Carb A switch — Display will
indicate one of the following:

• CA00 — Low and High Probes are open
(carbonator motor is energized)

• CA11 — Low and High Probes are closed
(carbonator motor is de-energized)

• CA01 — Low Probe closed (Motor will still be
on)

80 Part Number STH12 9/10

• Press and hold Carb B switch — Display will
indicate one of the following:

• Cb00 — Low and High Probes are open
(carbonator motor is energized)

• Cb11 — Low and High Probes are closed
(carbonator motor is de-energized)

• Cb01 — Low Probe closed (Motor will still be
on)

• Press and hold COMP/AGIT switch — Display will
indicate one of the following:

• CL 0 — Water level low

• CL 1

— Water level OK

Program Mode 2

Add circulation pumps C & D.

• Press PGM button for 3 seconds — Display shows

0001.

• Press PGM button — Display shows 0002
program mode 2.

• Wait 3 seconds — Display shows -002 = Factory
default setting.

• Pressing CIRC A button
energizes/de-energizes pump A

• Pressing CIRC B button
energizes/de-energizes pump B

• Program CIRC C — Press CARB A button –
Display shows -102 = Carb A button
energizes/de-energizes pump C

• Program CIRC D — Press CARB B button ­Display shows -012 = Carb B button
energizes/de-energizes pump D

Press and hold PGM switch for 3 seconds to save
settings and exit program mode.

Part Number STH12 9/10 81

Program Mode 4

Temporarily cancel display of error codes. Cancelling
the error codes allows circulating glycol temperatures
to be displayed until the error can be corrected.

• Press PGM button for 3 seconds — Display shows

0001.

• Press PGM button three times — Display shows
0004 program mode 4.

• Wait 3 seconds — Display shows -004 = All error
codes will be displayed during run mode.

• Press COMP/AGIT button once — Display shows

---4 = error codes will not be displayed during run
mode.

NOTE: Disconnecting and reconnecting main power
will reset the control board to the factory setting -004 =
Error codes will be displayed in the run mode.

Equipment Setup Procedure (with ERC)

1. Ensure that all valve nozzles are attached to the
valves.

2. Observe pressure of CO
500 psi (34 bar) or more, or bulk CO
150 psi or more. Primary regulator set at 90 psi
(6 bar) and the secondary regulator set at 35 psi
(2.4 bar).

3. Observe the control panel to verify that all
pressure gauges are set at correct operating
pressures.

4. Check the syrup tanks or BIB to make sure a
sufficient number of tanks are connected in series
to satisfy business volume.

5. Clean syrup inlet and outlet quick disconnects at
the same time tanks are replaced. Rinse
disconnects in clean potable water.

high pressure tank of

2

tank of

2

82 Part Number STH12 9/10

Multiplex Electronic Refrigeration Control (ERC)

SUPPLY POWER ON

AGITATOR

COMES ON

CONSTANTLY

COMPRESSOR

DELAY SHOWS

“Cd99” AND

COUNTS DOWN

TO “Cd00”

POWER UP DELAY

SHOWS “Pd30”

AND COUNTS

DOWN TO “Pd00”

COMPRESSOR

COMES ON AFTER

DELAY, IF

CONTROL CIRCUIT

REQUIRES

COMP/AGIT

SWITCH ON

YES

NO

YES

NO

ERROR

CODE(S)

NORMAL RUN

MODE DISPLAY

SHOWS CIRC

WATER TEMP (S)

OR WATER BA TH

TEMP IN BEER

PRESS ANY

SWITCH TO

TURN ON LOAD

OR LOAD

CONTROL

CIRCUIT

RESPECTIVE

LED COMES ON

CONSTANT,

FLASHES IF

LOAD CONTROL

CIRCUIT ON

ERROR CODE

DISPLAYS TILL

CORRECTED

MULTIPLE

ERRORS CYCLE

PGM MODE 4

OVERRIDES

E1 = LOW WATER PRESS

E2 = LOW CO2 PRESS

E3 = LOW WATER BATH LEVEL

E4 = HIGH WATER BATH TEMP

E5 = HIGH WATER PRESS

E6 = HIGH REFRIGERATION TEMP

E7 = LARGE ICE BANK

E8 = LONG CARB A RUN TIME

E9 = LONG CARB B RUN TIME

“===” =OPEN

“___” =SHORT

ENTER PROGRAM MODE

EXIT PROGRAM MODE

PROGRAM MODE

TO ENTER, PRESS AND HOLD PGM SWITCH FOR MINIMUM OF 3 SECONDS. DISPLAY SHOWS “0001”

TO EXIT, PRESS AND HOLD PGM SWITCH FOR MINIMUM OF 3 SECONDS. DISPLAY SHOWS NORMAL RUN MODE

PROGRAM MODE 1 PROGRAM MODE 2

PROGRAM MODE 3 PROGRAM MODE 4

Programming

Part Number STH12 9/10 83

PROGRAM MODE 1

READ CONDUCTIVITY,

TEMPERATURE,

PRESSURE CHANGE

UNITS

WAIT 3 SECONDS

DISPLAY SHOWS “C000”

PROGRAM MODE 2

PROGRAM ONE OR TWO MORE

CIRCULATING PUMPS

PRESS PGM SWITCH ONCE IN

LESS THAN 3 SECONDS

DISPLAY “0002”, WAIT THREE

SECONDS DISPLAY “-002”

PROGRAM MODE 3

PROGRAM TEMPERATURE

CONTROL OF WATER BATH

(BEER)

PRESS PGM SWITCH TWICE

IN LESS THAN 3 SECONDS,

DISPLAY “0003”, WAIT

THREE SECONDS DISPLAY

“-003”

PROGRAM MODE 4

TEMPORARILY DISABLE

ERRORS

PRESS PGM SWITCH

THREE TIMES IN LESS

THAN THREE SECONDS

DISPLAY “0004”, WAIT

THREE SECONDS

DISPLAY “-004”

PRESS COMP/AGIT

SWITCH, DISPLAY

SHOWS “---4”

INDICATING ERROR

CODES WILL BE

DISABLED UNTIL NEXT

POWER ON/OFF

SEQUENCE

TO CHANGE UNITS

WHEN “F000” PRESS

COMP/AGIT SWITCH

ONCE TO CHANGE

TEMPERATURE UNITS

TO CENTIGRADE

“FC00”

WHEN “P000” PRESS

COMP/AGIT SWITCH

ONCE TO CHANGE

PRESSURE UNITS TO

BAR “Fb00”

PRESS COMP/AGIT SWITCH

ONCE, DISPLAY = “1XX3” WHERE

XX=SET POINT TEMPERATURE

(DEFAULT = “1273”)

(DIFFERENTIAL FIXED AT 2°

ABOVE SET POINT)

PRESS CIRC A SWITCH

TO LOWER SET POINT

TEMPERATURE

PRESS CIRC B SWITCH

TO RAISE SET POINT

TEMPERATURE

NOTE:

SET POINT =

COMPRESSOR OFF

DIFFERENTIAL IS FIXED

AT 2°F ABOVE SET POINT

COMPRESSOR ON

PRESS CARB A SWITCH TO

CONVERT CARB A MOTOR

TO CIRC MOTOR

“-102”

PRESS CARB B SWITCH TO

CONVERT CARB B MOTOR

TO CIRC MOTOR

“-112”

“F0000” (TEMPERATURE)

PRESS CARB A SWITCH

TO SHOW WATER BATH

TEMP

PRESS CIRC A SWITCH TO

SHOW DISCHARGE TEMP

PRESS CIRC B SWITCH TO

SHOW SUCTION TEMP

PRESS PGM SWITCH ONCE

“P000” (PRESSURE)

PRESS CARB A SWITCH

TO SHOW WATER SUPPL Y

PRESSURE

PRESS CARB B SWITCH

TO SHOW CO2 PRESSURE

“C000” (CONDUCTIVITY)

PRESS COMP/AGIT

SWITCH TO SHOW ICE

BANK PROBE

“CC11” = NO ICE

COMPRESSOR ON; “CC10”

= ICE ON LOW SENSOR

COMPRESSOR OFF

“CC00” = ICE BANK TOO

LARGE (E7)

PRESS CARB A SWITCH

TO SHOW LLC PROBE

“CA00” = NO WATER

CARB A MOTOR ON

“CA01” = LOW SENSOR

IN WATER, MOTOR ON

“CA11” = LOW & HIGH

SENSOR IN WATER,

MOTOR OFF

REPEAT ABOVE FOR

CARB B SWITCH “CbXX”

PRESS CIRC A SWITCH

TO SHOW WATER LEVEL

PROBE “CL 1” = WATER

“CL 0” = LOW WATER (E3)

PRESS PGM SWITCH ONCE

Equipment Close Procedure — All Units

1. Clean the unde rside of the dispensing tower
around the nozzle area with a clean damp towel.

2. Pour at least 60 oz (1.8 liters) of warm water down
the drain openings.

84 Part Number STH12 9/10

MUL TIP LEX ELECTRONIC REFRIGERATION

POWER UP DELAY

SHOWS “Pd30”

AND COUNTS

DOWN TO “Pd00"

SUPPLY POWER ON

NORMAL RUN

MODE

DISPLAY SHOWS

CIRC WATER

TEMP(S) OR

WATER BATH

TEMP IN BEER

MODE

COMP/AGIT

SWITCH ON

NO

YES

P R O G R A M M O D E

TO ENTER, PRESS AND HOLD PGM SWITCH FOR MINIMUM OF 3 SECONDS, DISPLAY SHOWS “0001”

TO CHANGE TO NEXT PROGRAM MODE, PRESS PGM BUTTON SEQUENTIALLY IN LESS THAN 3 SECONDS FROM ENTER (“0002”, ETC)

TO EXIT, PRESS AND HOLD PGM SWITCH FOR MINIMUM OF 3 SECONDS, DISPLAY SHOWS NORMAL RUN MODE

RESPECTIVE

LED COMES ON

CONSTANT,

FLASHES IF

LOAD CONTROL

CIRCUIT ON

PRESS ANY

SWITCH TO

TURN ON LOAD

OR LOAD

CONTROL

CIRCUIT

AGITATOR

COMES ON

CONSTANTLY

COMPRESSOR

COMES ON AFTER

DELAY, IF

CONTROL CIRCUIT

REQUIRES

ENTER PROGRAM MODE

EXIT PROGRAM MODE

PROGRAM MODE 4

TEMPORARILY DISABLE

ERRORS

PRESS PGM SWITCH

THREE TIMES (3) IN

LESS THAN 3 SECONDS

DISPLAY “0004”, WAIT

THREE (3) SECONDS

DISPLAY “-004”

PROGRAM MODE 3

PROGRAM TEMPERATURE

CONTROL OF WATER BATH

(BEER)

PRESS PGM SWITCH TWICE

(2) IN LESS THAN 3

SECONDS, DISPLAY “0003”,

WAIT THREE (3) SECONDS

DISPLAY “-003”

PROGRAM MODE 2

PROGRAM ONE (1) OR TWO (2)

MORE CIRCULATING PUMPS

PRESS PGM SWITCH ONCE (1)

IN LESS THAN 3 SECONDS

DISPLAY “0002”, WAIT THREE

(3) SECONDS DISPLAY “-002”

PROGRAM MODE 1

READ CONDUCTIVITY,

TEMPERATURE,

PRESSURE

CHANGE UNITS

WAIT 3 SECONDS

DISPLAY SHOWS “C000”

COMPRESSOR

DELAY SHOWS

“Cd99” AND

COUNTS DOWN

TO “Cd00”

ERROR

CODE(S)

NO

YES

ERROR CODE

DISPLAYS TILL

CORRECTED

MULTIPLE

ERRORS CYCLE

PGM MODE 4

OVERRIDES

E1 = Low Water Suply Pressure

E2 = Low Co2 Pressure

E3 = Low Water Level - Water Bath

E4 = High Water Bath Temperature

E5 = High Water Supply Pressure

E6 = High Refrigeration Temperature

E7 = High Ice Bank Size (Probe Sensor 2)

E8 = Long Carb A Run Time

E9 = Long Carb B Run Time

Shorted Transducer = "----"

Open Transducer = "===="

CONTROL (ERC) PROGRAMMING

Part Number STH12 9/10 85

“C000”(CONDUCTIVITY)

PRESS COMP/AGIT

SWITCH TO SHOW ICE

BANK PROBE

“CC11” = NO ICE

COMPRESSOR ON

“CC10”= ICE ON LOW

SENSOR COMPRESSOR

OFF

“CC00” = ICE BANK TOO

LARGE (E7)

PRESS CARB A SWITCH

TO SHOW LLC PROBE

“CA00” = NO WATER

CARB A MOTOR ON

“CA01”= LOW SENSOR

IN WATER, MOTOR ON

“CA11” = LOW & HIGH

SENSOR IN WATER,

MOTOR OFF

REPEAT ABOVE FOR

CARB B SWITCH “CbXX”

PRES CIRC A SWITCH

TO SHOW WATER

LEVEL PROBE

“CL_1” = WATER

“CL_0” = LOW WATER

(E3)

PRESS COMP/AGIT

SWITCH, DISPLAY

SHOWS “---4”

INDICATING ERROR

CODES WILL BE

DISABLED UNTIL

NEXT POWER OFF/ON

SEQUENCE

“F000” (TEMPERATURE)

PRESS CARB A SWITCH

TO SHOW WATER BATH

TEMP

PRESS CIRC A SWITCH

TO SHOW

LIQUID LINE TEMP

PRESS CIRC B SWITCH

TO SHOW

SUCTION TEMP

“P000” (PRESSURE)

PRESS CARB A SWITCH

TO SHOW WATER

SUPPLY PRESSURE

PRESS CARB B

SWITCH TO SHOW CO2

PRESSURE

PRESS COMP/AGIT

SWITCH ONCE, DISPLAY

=”1XX3" WHERE XX= SET

POINT TEMPERATURE

(DEFAULT = “1273”)

(DIFFERENTIAL FIXED AT

2° ABOVE SET POINT)

PRESS CIRC A SWITCH

TO LOWER SET POINT

TEMPERATURE

PRESS CIRC B SWITCH

TO RAISE SET POINT

TEMPERATURE

NOTE:

SET POINT =

COMPRESSOR OFF

DIFFERENTIAL IS FIXED

AT 2°F ABOVE SET POINT

COMPRESSOR ON

PRESS CARB A SWITCH TO

CONVERT CARB A MOTOR

TO CIRC MOTOR

“-102”

PRESS CARB B SWITCH TO

CONVERT CARB B MOTOR

TO CIRC MOTOR

“-112”

PRESS PGM SWITCH

ONCE (1)

PRESS PGM SWITCH

ONCE (1)

TO CHANGE UNITS

WHEN “F000” PRESS

COMP/AGIT SWITCH

ONCE (1) TO CHANGE

TEMPERATURE UNITS

TO CENTIGRADE

“FC00”

WHEN “P000” PRESS

COMP/AGIT SWITCH

ONCE (1) TO CHANGE

PRESSURE UNITS TO

BAR

“Fb00”

86 Part Number STH12 9/10

Troubleshooting

Electronic Refrigeration Control (ERC) Model Error Codes

• Error codes will interrupt the temperature display

and stay active until the error is corrected.

• If multiple errors are present, the errors will rotate

and display every 5 seconds.

• Resetting errors — After correcting the problem,

the respective switch for the error must be cycled
OFF and then ON to reset.

• Disconnecting and reconnecting power will erase

all errors.

Error
Code

E1 Low Water Supply Pressure Lower than 5 psi for 5 Seconds
E2 Low CO2 Pressure Lower than 10 psi for 5Seconds
E3 Low Water Level – Water

E4 High Water Bath Temperature Water Bath Temperature Greater

E5 High Water Supply Pressure Water Pressure Greater than

E6 High Refrigeration

E7 High Ice Bank Size Ice Contacting Center Ice Bank

E8 Long Carb A Run Time Energized for 7 Continuous

E9 Long Carb B Run Time Energized for 7 Continuous

Error Cause

Bath

Temperature

Must Cover Top of Evaporator

Discharge Line Temperature

Greater than 190°F

Than 45°F

75 psi

Probe

Minutes

Minutes

Part Number STH12 9/10 87

ERROR CODES E1, E2, & E3 FLOWCHART

EI

YES

NO

NORMALLY CAUSED

BY WATER

PRESSURE <5 PSI

FOR 5 SECONDS

MUST STAY ABOVE

10 PSI TO CORRECT

E3 E4 E5 E6 E7 E8 E9

E2

NO

YES

NO

NO

YES

YES/END

NOTE: THAT

ALL CARB

MOTORS AND

ALL CIRC

MOTORS WILL

GO OFF, WITH

THIS

ERRORCOMPR

ESSOR AND

AGITATOR

STAY ON

NORMALLY CAUSED

BY CO2 PRESSURE

<10 PSI FOR 5

SECONDS MUST

STAY ABOVE 15 PSI

TO CORRECT

NORMALLY

CAUSED BY

WATER LEVEL IN

WATER BATH

BELOW PROBE

CONDUCTORS

GO INTO PROGRAM

MODE 1 PRESSURE

READOUT “P000”

GO INTO PROGRAM

MODE 1 PRESSURE

READOUT “P000”

PRESS CARB A

BUTTON TO VERIFY

WATER

PRESSURE“PXXX”

DISPLAY

PRESSURE

>15 PSI

PRESS CARB B

BUTTON TO VERIFY

CO2 PRESSURE

“PXXX” PSI

DISPLAY

PRESSURE

>20PSI

VERIFY WATER

LEVEL ABOVE

PROBE TIPS

ADD WATER TO

WATER BATH

ABOVE LEVEL OF

PROBE TIPS

GO INTO PROGRAM

MODE 1

CONDUCTIVITY“C000”

E3 ERROR

GOES OFF

PRESS CIRC A BUTTON

TO VERIFY

CONDUCTIVITY“CL_X”

88 Part Number STH12 9/10

VERIFY INCOMING

WATER SUPPLY

PRESSURE TO UNIT >15

PSI OR NOT WITH

ANOTHER GAUGE IN THE

SUPPLY SYSTEM

E

REPLACE ERC

CIRCUIT

BOARD

020001985

YES

NO

YES

NO

YES

YES

NO

YES

NO

YES

REPLACE ERC

CIRCUIT BOARD

020001985

REPLACE ERC

CIRCUIT BOARD

020001985

SUPPLY

PRESSURE

>15PSI

SUPPLY

PRESSURE

>20PSI

REPLACE

WATER PRESS

TRANSDUCER

020001992

TROUBLESHOOT

WATER SUPPLY

SYSTEM, TO FIX

LOW WATER

PRESSURE

CONDITION

REPLACE CO2

PRESS

TRANSDUCER

020001992

TROUBLESHOOT

CO2 SUPPLY

SYSTEM, TO FIX

LOW PRESSURE

CONDITION

DISPLAY

CONDUCTIVI

TY= “CL_1”

= “CL_0"REMOVE

LEVEL PROBE

CONN FROM ERC,

SHORT ERC

LEVEL PROBE

PINS

VERIFY CO2 SUPPLY

PRESSURE TO UNIT,

>20PSI OR NOT, WITH

ANOTHER GAUGE IN THE

SUPPLY SYSTEM

PULL CARB A OR

B CONNECTOR

OFF ERC, ERROR

GOES AWAY (CAN

USE TEMP)

E3 ERROR GOES

AWAY

REPLACE LEVEL

PROBE 020002143

Part Number STH12 9/10 89

ERROR CODES E4, E5, & E6 FLOWCHART

EI

E2 E3 E4 E5 E6 E7 E8 E9

NORMALLY CAUSED BY WATER

BATH TEMPERATURE > 45°F

NORMALLY CAUSED BY WATER

PRESSURE >75 PSI,

NORMALLY CAUSED BY LIQUID

SIDE TEMPERATURE>200°F

NO

YES

GO INTO PROGRAMMING MODE

1, “F000”PRESS CARB A BUTTON

TO SHOW WATER BATH

TEMP“FXXX” °F

GO INTO PROGRAMMING MODE

1, “P000”PRESS CARB A BUTTON

TO SHOW INCOMING WATER

PRESSURE “PXXX” PSI

GO INTO PROGRAMMING MODE

1, “F000”PRESS CIRC A BUTTON

TO SHOW LIQUID LINE TEMP

“FXXX” °F

WATER BATH

TEMP DISLAY

NO

YES

WATER PRESS

>75 PSI

NO

>45 °F

NO

YES

LIQUID LINE

TEMP >200°F

VERIFY TEMP WITH SECOND

THERMOMETERIF STILL

<45°FREPLACE ERC BOARD

VERIFY PRESSURE WITH

SECOND PRESS GAUGE

VERIFY TEMPERATURE WITH

SECOND TEMP GAUGE

020001985

90 Part Number STH12 9/10

NO

YES

YES

NO

YES

NO

PRESSURE

VERIFIED

TEMPERATURE

VERIFIED

VERIFY TEMPERATURE

WITH SECOND

THERMOMETER

TROUBLE SHOOT WATER

SUPPLY SYSTEM TO FIX.

HIGH WATER PRESS,

REGULATOR BAD, NEEDED

FIRST CHECK FOR

CONDENSER FAILURE OR HOT

GAS BYPASS

TEMPERATURE

VERIFIED

GO TO COMPRESSOR /

REFRIGERATION SYSTEM

TROUBLESHOOTING

REPLACE WATER

PRESSURE TRANSDUCER

020001992

GO TO COMPRESSOR

TROUBLESHOOTING TO FIX

REFRIGERATION SYSTEM

REPLACE DISCHARGE/LIQUID

LINE TEMPERATURE

THERMISTOR 020001991

VERIFY TEMP WITH SECOND

THERMOMETERIF STILL <200°F

REPLACE ERC CONTROL

BOARD 020001985

VERIFY PRESS WITH

SECOND GAUGE, IF

CORRECTREPLACE ERC

BOARD 020001985

REPLACE WATER BATH

THERMISTOR

020002142

Part Number STH12 9/10 91

ERROR CODES E7, E8, & E9 FLOWCHART

EI

E2 E3 E4 E5 E6 E7 E8 E9

NORMALLY CAUSED BY CARB

MOTOR A RUNNING > 7

MINUTES CONTINUOUSLY

NORMALLY CAUSED BY ICE

ON ICE BANK PROBE PIN #2

(MIDDLE PIN)

SAME AS E8 FOR CARB

B MOTOR/PUMP

NO

YES

VERIFY VISUALLY THAT ICE

IS OVER ICE BANK PROBE

PIN #2 (MIDDLE PIN)

FIRST CHECK FOR LEAK IN

CARB SYSTEM

YES

NO

PIN #2

COVERED IN

ICE

LEAK IN

SYSTEM

VERIFY ICE BANK PROBE

INSTALLED

CORRECTLYPLASTIC STEP ON

PROBE AWAY FROM EVAP

FIX LEAK

UN-PLUG CARB B

CONNECTOR FROM ERC (#1)

TO VERIFY CONDUCTIVITY

OK

THEN CHECK FOR PUMP

OUTPUT(32 OZ IN LESS

THAN 20 SEC)

92 Part Number STH12 9/10

NO

NO

YES

YES

YES

NO

“E7” ERROR

GOES AWAY

PUMP GOOD

UN-PLUG ICE BANK PROBE

BOARD

RESET ERROR (PUSH CARB A

AND/OR B BUTTON OFF, THEN

ON TO RESET

COMPRESSOR ON TOO

LONGGOTO

COMPRESSOR /

REFRIGERATION

TROUBLESHOOTING

“E7” ERROR

GOES AWAY

IF “E8” AND/OR “E9”

CONTINUE TO OCCUR

REPLACE ERC CONTROL

BOARD 020001985

REPLACE ERC

CONTROL BOARD IF

PROBLEM CONTINUES

020001985

REPLACE ICE BANK

PROBE 020002091

REPLACE PUMP

Part Number STH12 9/10 93

FAN / REMOTE

CONDENSER

REFRIGERATION

SYSTEM

AGITATORCOMPRESSOR

YESYES

NO/

END

NO

OUTPUT TERMINALS

ARE COMMON TO

COMPRESSOR

OUTPUT TERMINALS

ON ERC

AGITATOR

WILL NOT GO

OFF WITH

KEYPAD

BUTTON / LED

AGITATOR

WILL NOT

COME ON WITH

KEYPAD

BUTTON / LED

COMPRESSOR

WILL NOT GO

OFF

COMPRESSOR

WILL NOT COME

ON

CHECK CONNECTORS

AND WIRING TO FAN /

REMOTE

CONDENSERCHECK

MOTORS

VERIFY KEYPAD/DISPLAY GOOD,

SEE KEYPAD / DISPLAY TROUBLE

SHOOTING PAGE 7

VERIFY KEYPAD/DISPLAY GOOD,

SEE KEYPAD / DISPLAY TROUBLE

SHOOTING PAGE 7

IF COMPRESSOR

COMES ON AND STILL

NO COOLING, USE

REFRIGERATION

TROUBLESHOOTING

COMPRESSOR

WILL STILL NOT

GO OFF

COMPRESSOR

WILL STILL NOT

COME ON

AGITATOR

WILL

STILL NOT

COME ON

AGITATOR

WILL

STILL NOT

GO OFF

CHECK (LIQUID LINE

TEMP) AND EVAP OUT

TEMP

VERIFY ICE BANK

PROBE TIP #1 IN ICE

PULL CARB A CONN

TO RESET

CONDUCTIVE

PROBES

REPLACE

VERIFY

COMPONENT TROUBLESHOOTING

94 Part Number STH12 9/10

END

NO

NO

NO

YES

NO

YES

ELSE

PROBES

REPLACE

ERC

CONTROL

BOARD02

0001985

VERIFY

VOLTAGE

ON ERC

AGITATOR

TERMINALS

PULL ICE BANK

CONN ON ERC,

COMPRESSOR

SHOULD GO OFF

SHORT ICE BANK

CONNECTOR #3ALL

PINS

REPLACE ICE

BANK PROBE

REPLACE

HPCO

SWITCH

VERIFY HPCO

SWITCH

CLOSEDSHORT

CONN 12

REPLACE ICE

BANK PROBE

020002091

IF NO

VOLTAGE

REPLACE

ERC

CONTROL

BOARD

020001985

REPLACE ERC

CONTROL BD

020001985

VERIFY VOLTAGE

AT COMP OUTPUT

TERMINALS ON

ERC

REPLACE ERC

CONTROL BD

020001985

CHECK

CONNECTO

RS AND

WIRING TO

CONTACTOR

COIL

VERIFY WIRING /

CONNECTORS TO

AGITATOR

MOTOR

REPLACE

CONTACTOR

VERIFY VOLTAGE

AT CONTACTOR

COIL

REPLACE

AGITATOR

MOTOR

VERIFY PROPER

VOLTAGE AT

COMPRESSOR

REPLACE

COMPRESSOR

Part Number STH12 9/10 95

CIRCULATING

SYSTEM A OR B

ERC CONTROL BOARD

AND KEYPAD /

DISPLAY

CARBONATOR SYSTEM

A OR B

YES

/

END

CARB MOTOR

DOES NOT

TURNON

CARB MOTOR

DOES NOT

TURNOFF

CIRC MOTOR

DOES NOT

TURNON

CIRC MOTOR

DOES NOT

TURNON

KEYPAD /

DISPLAY NOT

WORKING

ERC POWER

LED NOT ON

KEYPAD

BUTTON(S) DO

NOT RESPOND,

RESPECTIVE

LEDS DO NOT

COME ON

VERIFY PROPER

VOLTAGE ON

ERC TERMINALS

L1 AND L2

FIRSTVERIF

Y PRG

MODE 2 IS

SET TO “-

002”FOR

BOTH CARB

PUMPS

VERIFY NO “E1” ERRORGOTO

PROGRAM MODE 1 CONDUCTIVITY

“C000”

VERIFY NO

“E1” ERROR

PRESS CARB A AND/OR CARB B

BUTTON, VERIFY CARB A AND/OR B

CONDUCTIVITY PROBES

YES

NO

POWER ERC

OFF, THEN ON,

VERIFY NO

COUNTDOWN

“PdXX”ON

DISPLAY

TURN POWER

OFF THEN ON

TO RESET ERC

VERIFY KEYPAD /

DISPLAY WORKS,

CIRC LED GOES

ON AND OFF

“CX__” X= A OR B

VERIFY VOLTAGE

AT CIRC OUTPUT

TERMINALS ON

ERC

KEYPAD

BUTTONS NOW

WORK

“CX00”

CARB

MOTOR

SHOULD BE

ON

“CX11”

CARB

MOTOR

SHOULD BE

OFF

REPLACE

ERC

CONTROL

BOARD

YES /

END

96 Part Number STH12 9/10

NO

NO

YES

NO

CHECK ALL WIRES

AND

CONNECTORS TO

CIRC MOTOR,

CHECK CIRC

MOTOR

DISPLAY SHOWS

POWER UP

COUNTDOWN“PdXX”

VOLTAGE

AT ERC

AGIT

OUTPUT

TERMINALS

VOLTAGE

AT ERC

AGIT

OUTPUT

TERMINALS

NO

NO/

END

YES

YES

REPLACE KEYPAD / DISPLAY

020001986

REPLACE ERC

CONTROL

BOARD

020001985

REPLACE

KEYPAD /

DISPLAY IF

BAD 020001986

ORIF

WIRES/MOTOR

OK, REPLACE

ERC BOARD

020001985

CHECK ALL WIRES

AND CONNECTORS

FOR OPEN ON CARB

TANK WIRING

HARNESSCHECK

CARB MOTOR

REPLACE ERC CONTROL

BOARD 020001985

IF DISPLAY FLASHES ERRATIC

NUMBERS / SYMBOLS, REPLACE

KEYPAD / DISPLAY020001986

REPLACE ERC

CONTROL BOARD

GENERAL NOTE: FOR DISPLAY PROBLEMS, IF

COUNTDOWN OCCURS ON POWER UP, “PdXX”,

THEN DISPLAY IS PROBABLY AT FAULT, NOT

ERC

020001985

Part Number STH12 9/10 97

Checklist

!

Warning

If a problem arises during operation of your post mix
soda refrigeration unit, follow the checklist below.
Routine adjustments and maintenance procedures are
not covered by the warranty.

Only trained and certified electrical and plumbing
technicians must service this unit. All wiring and
plumbing must conform to national and local
codes.

Problem Possible Cause To Correct

Water only
dispensing:

No pressure

Syrup and CO2 only

dispensing:
Carbonator

Syrup and plain

water only

dispensing: No

pressure

One valve will not

dispense anything:

Is there power to

the valve?

Regulator(s) out of

adjustment
Out of CO

Defective regulator(s) Check/repair/replace

CO2 line pinched,

kinked, or obstructed

Defective carbonator Check/repair/replace carbonator

HP regulator out of

CO2 line pinched,

kinked, or obstructed
Broken wire or loose

Bad microswitch Replace microswitch.

2

No power Check power supply. Plug in

Water supply Make sure water is turned ON.

Out of CO

2

adjustment

Defective HP

regulator

connection

Check/adjust regulator(s).

Install fresh tank.

regulator(s).

Check/repair/replace CO2 line.

carbonator or reset breaker.

Replace water filter.

Check/clean/replace pump

strainer.

Check/clean/repair water check

Internal Carbonator unit only.

pump, motor, electrode or liquid

Adjust HP regulator to the proper

Check/repair/replace CO2 line.

Replace/repair wire or connector.

valve.

Check for frozen water line.

level control.

Install fresh tank.

setting.

Check/repair/replace HP

regulator.

98 Part Number STH12 9/10

Problem Possible Cause To Correct

Beverage

dispensed is too

sweet:

Is the ratio (brix) of

the drink correct?

Beverage is not

sweet enough:

Is the ratio (brix) of

the drink correct?

Drinks are foaming:

Are system

pressures correct?

Flow control out of

adjustment

Insufficient soda flow

due to low carbonator

pressure

Low CO2 pressure

due to leaks

Obstruction in the
water or soda line

Flow control out of

adjustment

Soda flow too high Reset CO2 pressure or replace

Obstruction in syrup

line

Over carbonation Check CO2 supply. Reset

Dirty lines/valves Clean/sanitize entire system.

Adjust the flow control.

Adjust CO2 pressure or change

Repair CO2 leaks.

Clean out the lines.

Adjust the flow control.

regulator if necessary.

Clean out the syrup line.

pressure or replace regulator is

the tank.

necessary.

Part Number STH12 9/10 99

Problem Cross-reference Guide

CO2Carbonated

Circulating

Compress Air

Dispenser

Electrical

Refrigeration

Syrup
No carbonated water X X X X
Carbon particles in drink X X X
Flat drinks X X R R X
No or insufficient non-carbonated

water
Warm drinks X R
No or insufficient syrup X X R X
Peculiar taste carbonated water X R
Peculiar taste non-carbonated

water
Peculiar taste syrup X X R
Carb and booster pump noisy R R X
Air compressor operates

excessively
Loss of CO2 gas X R
Drinks too sweet R X
Too much syrup X R
Too much carbonated water X
Too much non-carbonated water X R
Foaming X R
Booster pump/motor won’t cycle

OFF
Booster pump/motor won’t cycle

ON
Excessive Carbonation X
Low pressure CO2 alarm won’t

cycle ON
Low pressure CO2 alarm won’t

cycle OFF
Water found in primary regulator X
Booster pump/motor won’t cycle

OFF
Booster pump/motor won’t cycle

ON
Product dripping from nozzle X
Valves will not activate X
Valves will not shut OFF X
Unit totally inoperative X

X - Specific problem listed in section
R - Problem refer to from section with “X”

RXR

X

X

X

X

XXX

XR

X

X

Water Booster

Water Filter

100 Part Number STH12 9/10