Electrofreeze 957RMT User Manual
H. C. DUKE & SON, LLC
2116 - 8th Avenue • East Moline, Illinois 61244
OPERATOR’S MANUAL
with Illustrated Parts List
Twin Twist
Soft Serve Freezer
Models
957RMT
184957 — 1/16
H.C. Duke & Son, LLC. P/N 184957 January 2016 Printed In U.S.A.
Operator’s Manual
for the
Soft Serve Twist Freezer
Model 957RMT
All contents © Copyright 2016 H.C. Duke & Son, LCC, 2116 Eighth Avenue, East Moline, Illinois 61244
Twin Twist Soft Serve Freezer Model 957RMT
Safety
First!
SAFETY FIRST!
Follow these four steps to safety ....
1. Recognize Safety Information ....Look for this safety alert
symbol throughout this manual.
When you see this symbol on your freezer or in this
manual, be alert to the potential for personal injury. Follow
recommended precautions and safe operating practices.
2. Understand Signal Words ....
The signal words — DANGER, WARNING and
DANGER
WARNING
CAUTION
CAUTION — are used with the safety alert symbol
(DANGER decals on the freezer may or may not
have the safety alert symbol, but the message is the
same). Decals with the words DANGER, WARNING,
or CAUTION appear on the freezer. DANGER
identies the most serious hazard. Decals with the
words DANGER or WARNING are typically near
specic hazards on the freezer. General precautions
are listed on CAUTION safety decals.
In this manual, CAUTION messages with the safety
alert symbol call attention to safety messages.
3. Follow Safety Instructions ....
Read and understand all safety messages in this
manual and on your freezer. Take notice of the location
of all decals on the freezer and keep the safety decals
in good condition. Check them periodically and replace
missing, damaged, or illegible safety decals. The
Safety
First!
safety decals must remain in place and be legible for
the life of the freezer. If you need new decals, use the
information and illustrations on pages iv and v of this
manual to identify the decal and call or write to H.C.
Duke & Son, LLC.
DO NOT attempt to operate the 957RMT Twin Twist
Soft Serve Freezer until you read and understand all
safety messages and the operating instructions in this
manual.
184957 iii
Twin Twist Soft Serve Freezer Model 957RMT
SAFETY FIRST!
4. Definitions ....
Trained person (or Operator): A person who has been trained in the basic operation of
the freezer. This person is knowledged in operation of machine startup, stopping, lling,
and basic cleaning, disassembly, washing, and sanitation of the freezer.
Freezer Technician: A person who has been trained by a factory representative, or
an experienced and qualied service person, to perform more complicated operations
such as freezer installation, maintenance repairs, component replacement , is aware of
hazards associated with electricity, moving parts, and takes necessary steps to protect
against injury to themselves and other people.
5. Operate Safely ....
IMPORTANT: Store Managers,owners, and supervisors must be aware of staff
capabilities and that they do not perform freezer operations outside their level of
knowledge or responsibility.
DO NOT allow untrained personnel to maintain or
service this freezer. Failure to follow this instruction
may result in severe personal injury. DO NOT operate
the freezer until all service and access covers are
secured with screws. DO NOT attempt to repair
the freezer until the main power supply has been
disconnected. Some freezers have more than one
disconnect switch. Contact your IDQ authorized
service representative or H.C. Duke & Son, LLC
Service Department for original equipment parts.
6. Caution ....
• This Freezer is to be operated by trained persons. The Dispense
feature, if used by public in self-serve applications, shall be monitored
by trained persons able to assist people with physical, sensory or mental
impaired capabilities.
• Children should not be allowed to play around this equipment.
• Do not store explosive substances such as aerosol cans with a ammable propellant
in freezer.
• This appliance is not designed for outdoor weather conditions and shall not be
exposed to rain.
• Do not wash machine with power sprayer. Do not install machine next to a power
sprayer where splash of freezer can occur.
• Machine is designed for use in areas of normal atmosphere. It is not to be used in
areas subject to explosion-proof standards.
iv 184957
Twin Twist Soft Serve Freezer Model 957RMT
Safety Decal Locations
Do not attempt to operate the freezer
until all safety precautions and operating
instructions in this manual are read and
understood.
Take notice of all warning, caution,
instruction and information decals (or
labels) on the freezer as shown in the
gure on the next page. The labels have
been put there to help maintain a safe
working environment.
The labels have been designed to
withstand washing and cleaning. All labels
must remain legible for the life of the
freezer. Check labels periodically to be
sure they can be recognized as warning
labels.
If it is necessary to replace any label,
please contact H.C. Duke & Son, LLC
When ready to order you will need to
determine the (1) part number, (2) type of
label, (3) location of label, and (4) quantity
required, and include a return shipping
address.
For factory service assistance, contact H.
C. Duke & Son, LLC, Service Department
by phone or FAX:
Phone: (309) 755-4553
(800) 755-4545
FAX: (309) 755-9858
E-mail: service@hcduke.com
(The decals on the next page are
numbered 1, 2, 3, and 4. Those numbers
correspond to the numbers in the table
below. The table provides the part
number, description, and quantity for each
decal.)
No. Part No. Description
2 HC165246 Decal-Pressurized System (3)
3 HC165126 Decal-Panel Removal Warning (1)
4 HC165048 Decal-Warning Rotating Parts (2)
1 HC165025 Decal-Beater Warning (1)
184957 v
Twin Twist Soft Serve Freezer Model 957RMT
Pressurized system.
Depressurize unit
before dismantling
mix transfer system.
Hazardous rotating beater shaft. Do not
operate unit with dispense head removed.
Before removing dispense head,
1. Turn all control switches to "OFF", and
2. Disconnect all power supplies. Unit
may have more than one power supply.
Hazardous moving parts.
Machine starts automatically.
Do not operate with panel
removed.
Do not
operate
with cover
removed!
Safety Decal Locations
vi 184957
Twin Twist Soft Serve Freezer Model 957RMT
Table of Contents
Safety Decal Locations
1 Introduction
2 Note to Installer
2.1 Uncrating and Inspection
2.2 Installation
2.3 Electrical Requirements
2.4 Electrical Connections
3 Specications
3.1 Particulars
3.2 Dimensions
3.4 Reference Information
3.5 Installation Date
3.6 WEEE (Waste Electrical and Electronic Equipment)
4 Part Names and Functions
5 Operator Controls
7 Disassembly and Cleaning
7.1 Cleaning Accessories
7.2 Disassembly Instructions
7.3 Cleaning Instructions
8 Assembly
9 Start-up Instructions
9.1 Sanitizing
9.2 Priming
9.3 Dispensing Product
10 Closing Procedures
10.1 Draining Product
11 General Information
11.1 Dairy Queen® Mix
11.2 Checking the Frozen DQ® Product
11.3 Product Temperature
11.4 Overrun
11.5 Overrun Adjustment
11.6 Rerun
11.7 Overrun Chart
12 Routine Maintenance
13 Troubleshooting
13.1 Compressor/Condensing Circuit Troubleshooting Tables
13.1 MTS Troubleshooting Tables
184957 vii
Twin Twist Soft Serve Freezer Model 957RMT
viii 184957
1 Introduction
Twin Twist Soft Serve Freezer Model 957RMT
The 957RMT Freezer is designed to
produce DQ frozen soft serve ice cream
or DQ yogurt, with a product serving
temperature of 18 to 19ºF (-8 to -7ºC).
If such products are prepared from
powdered concentrate, they should
be precooled to 40°F (4°C) prior to
introduction to the freezer. Use of other
products in this machine is considered
misuse (see Warranty.)
This manual has been prepared to assist
in the training of personnel on the proper
operation and general maintenance of
your Duke freezer.
Your freezer will not compensate for or
correct any assembly or priming errors
made during the initial start-up. Therefore
it is extremely important to follow the
assembly and priming procedures
detailed in this manual.
Be sure all personnel responsible for
equipment operation completely read and
understand this manual before operating
the freezer. When properly operated and
maintained, your freezer will produce a
consistent quality product.
If you require technical assistance, please
contact your local authorized H.C. Duke &
Son, LLC service company:
Name ______________________
Address_____________________
____________________________
Phone_______________________
or H.C. Duke & Son, LLC Service Dept.
for factory service assistance.
Phone: (309) 755-4553
(800) 755-4545
Fax number: (309) 755-9858
E-mail: service@hcduke.com
2 Note to Installer
This freezer must be installed and serviced by a service technician in
accordance with the installation instructions.
After installation the warranty registration card must be completed and
returned to validate warranty.
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Twin Twist Soft Serve Freezer Model 957RMT
2.1 Uncrating and Inspection
CAUTION
Be sure to properly support the
machine when removing bolts
and installing legs or casters.
When the unit is received and while
the carrier is still present, inspect the
shipping carton for any damage that
may have occurred in transit. If the
SHOCKWATCH® label indicates red and/
or the carton is broken, torn, or punctured
note the damage on the carrier’s freight
bill and notify the carrier’s local agent
immediately. Also note on the freight bill
1. Remove the carton from the pallet,
and move the machine as close as
possible to the permanent location.
2. Remove the shipping bolts on the
bottom of the freezer (gure 2-1) and
install either the legs or casters (gure
2-2).
Figure 2-1 Machine bolted to Shipping Base
Figure 2-2 Installing Mounting Legs or Casters
NOTE:
legs all the way in coupling,
then adjust out to level side
to side with 1/4 inc (6mm)
slope to the front.
Screw casters or
— continued
2 184957
2.2 Installation
Twin Twist Soft Serve Freezer Model 957RMT
CAUTION
All materials and connections
must conform to local
requirements and be in
compliance with the National
Electrical Code (NEC).
1. This freezer is designed for indoor use
and must be protected from outdoor
weather conditions.
2. Where codes permit, we recommend
that the freezer be installed on casters
and have exible water and electrical
connections for service and cleaning
ability.
3. All models require a minimum 6 inch
(15 cm) clearance on either the side
panels or the rear panel for adequate
ventilation. Freezers designed with
top air discharge require at least 24
inches (61 cm) above the top panel be
free of obstructions. Anything blocking
ventilation of the freezer (including
cone dispensers) will reduce the
efciency of the freezer.
4. Water cooled double models will
require a 1/2” MPT water inlet and
water waste connection. Both water
condensers are tied together so that
one water inlet and one water waste
is all that is required. The connections
are found on the bottom under the
compressor mounting area and are
clearly tagged - “Water Inlet” and
“Water Waste”. A manual shut-off
valve should be installed in the water
inlet line at the time of installation.
The water pressure must be between
35-140 psig (241-965kPa) for proper
operation.
5. Water cooled and air cooled remote
freezers require at least 12 inches
(30 cm) above the top panel be free
of obstructions. Anything blocking
ventilation of the freezer (including
cone dispensers) will reduce the
efciency of the freezer.
6. Place the freezer in the nal location
and level the machine by adjusting
the legs or casters so that the unit
is level side-to-side, and the front
is approximately ¼” lower than the
rear, to allow proper drainage of the
freezing cylinder.
7. Water Cooled Do not allow freezer to
be in ambient where air temperature
goes below 0°C (32°F),the freezing
temperature of water.
8. Water consumption increases if
temperature of entering water is
above 20°C (65°F)
2.3 Electrical Requirements
CAUTION
To prevent accidental electrical
shock, a positive earth ground
is required.
1. Always verify electrical specications
on the data plate of each individual
freezer. Data plate specications will
always supersede the information in
this manual. (See Figure 3-2)
184957 3
2. Supply voltage must be within + 10%
of voltage indicated on the nameplate.
Also, on three-phase systems,
voltage between phases must be
balanced within 2%. (More than a
6 volt difference between any two
voltage measurements at 208-230
volts indicates a possible imbalance.)
Request your local power company to
correct any voltage problem.
3. An easily accessible main power
disconnect must be provided for all
poles of the wiring to the freezer.
Twin Twist Soft Serve Freezer Model 957RMT
2.4 Electrical Connections
CAUTION
To prevent accidental electrical
shock, a positive earth ground
is required.
1. Double freezers with two compressors
require one power supply for each
side of the freezer. Each side of the
freezer operates independently.
2. Check the data plate for fuse
size, wire ampacity, and electrical
specications. (See Figure 3-2)
3. Refer to the wiring diagram provided
for proper power connections.
4. Electrical connections are made in
the junction boxes located mid-level
behind the left side panel.
WARNING
Important
Set switch next to the connection
box “UP” for 220-230v or “DOWN”
for 208-219V. Failure to set switch to
proper voltage will cause damage to
the electrical components and will void
all warranties.
5. Use a exible connection when
permissible.
6. Beater Shaft Rotation Freezers are
designed for clockwise rotation when
viewed from front of freezer. 1ph
machines are prewired for proper
rotation. On 3phase machines, phase
wires to freezer should be connected
to produce proper beater rotation.
This is to be done by a freezer
technician.
Warning: When installing the
machine, insert an all pole disconnect,
adequately sized according to freezer
nameplate marking with electrical contact
spacing of 3mm minimum. This should be
within sight of the freezer.
4 184957
Twin Twist Soft Serve Freezer Model 957RMT
3 Specifications
3.1 Particulars
Always check and verify voltage and amperage on the data
plate located on the back panel of each freezer.
957RMT
Width-in./cm 26/66
Height-in./cm 67.5/171
Depth-in./cm 36.5/93
Weight-lbs./kg 847/384
Compressor (2) 2 H.P. /9500 BTUH
1.5 kw (Motor)
2.8 kw (Cooling)
Beater Motor (2) 2 H.P/1.5 kw
Refrigerant 404a
*Charge 3.75 lb/1.7 kg
Mix Container (2) 30 Qts./28.4 Liters
Cylinder (2) 4 Qts./3.8 Liters
Noise: The Steady acoustic pressure level, for both air cooled
and water cooled freezers, is less than 70dB(A).
Water Cooled units: Water consumption increases if temperature
of entering water is above 20°C (65°F)
*Approximate for each side. See nameplate for actual charge.
184957 5
Twin Twist Soft Serve Freezer Model 957RMT
3.2 Dimensions
The dimensions of the 957RMT are provided in Figure 3-1, below.
Figure 3-1
3.3 Data Plate
1
Model:
Ser.No:
Volts
Ph. HZ. Wire: ASSEMBLED IN USA
SINGLE UNIT
Cyl. Compressor RLA LRA
Beater Motor FLA HP
Pump Motor
Cabinet Compressor FLA PH
Flavor Blender Motor FLA PH HP
Evaporator Fan FLA HP
Cylinder Refrigerant: Amt: LB Type:
Design Pressure: High: Low:
Cabinet Compressor Refrigerant Amt: oz Type: Design Pressure psig: High: Low:
Min. Circuit Ampacity: A
Max Fuse Size or HACR Cir. Breaker: A
Figure 3-2 Data Plate
2
5
3
FLA HP
4
The data plate provides important
information that the operator should
record and have available for parts
ordering, warranty inquiries, and
service requests.
6 184957
Twin Twist Soft Serve Freezer Model 957RMT
3.4 Reference Information
Write in
Reference
Information HERE!
Fill in the following information below as
soon as you receive the 957RMT. (The item
numbers—encircled, below—correspond
with the callout numbers above.)
IMPORTANT: Complete for reference:
1.) Model Number: __________________
2.) Serial Number: __________________
3.) Electrical Spec: Voltage ___________
Phase _______ Hertz ____________
4.) Maximum Fuse Size: _____________
5.) Minimum Circuit Ampacity: ________
3.5 Installation Date
Installation Date _____________________________
Installed by _____________________________
Address ________________________________
______________________________________
Phone _________________________________
3.6 WEEE (Waste Electrical and Electronic Equipment)
In conformity with EU 2002/96/EC,
this freezer, at the end of life cycle,
is not to be discarded with normal
urban waste. Instead, it is the user’s
responsibility to dispose of this product
by returning it to a collection point
designated for the recycling of electrical,
electronic components and separation
of reclaimable, recyclable materials.
Contact your local distributor or authority
for correct disposal.
184957 7
Twin Twist Soft Serve Freezer Model 957RMT
4 Part Names and Functions
Figure 4-1 Head Assembly
8 184957
Twin Twist Soft Serve Freezer Model 957RMT
4 Part Names and Functions (continued)
The following descriptions apply to gure 4-1. The number preceding the part
name corresponds to the number in the gure.
1.) HEAD: Encloses the freezing cylinder
and provides an opening for product
to be dispensed. NOTE: Beater
motors will not operate with the head
removed from the freezer.
2.) SPIGOT - ASSEMBLY SIDE WITH
HANDLE (Stainless Steel): Seals
the product opening in the head when
closed. Allows product to ow when
open.
3.) O-RING - SPIGOT: Seals the spigot
in the head. Must be lubricated to seal
and slide properly.
4.) O-RING - SPIGOT EXTENSION:
Holds the extension on to the spigot.
5.) ROD - SPIGOT: Starts the freezer
when dispensing. Must be in place
before freezer will operate.
6.) KNOB-HAND: Secures the head to
the freezing cylinder.
10.) PLUG-AIR BLEED (BLEEDER
ASSY.): Seals the air bleed
opening in the head when closed.
Allows excess air to be removed
from the cylinder when priming.
11.) HANDLE-TAPERED BLACK
(Plastic): Black plastic handle that
ts onto the stainless steel handle.
12.) SPIGOT-LONG CENTER
WITHOUT HANDLE (Stainless
Steel): Seals the product opening
in the dispense head when closed.
Allows product to ow when open.
13.) ROD-HANDLE CENTER SPIGOT
(Stainless Steel): Opens
and closes the spigot to start and
stop the ow of product from the
freezer.
7.) EXTENSION - SPIGOT: (Accessory)
Extends the product opening down to
shape the product as it is dispensed.
8.) O-RING - HEAD: Seals the head
to the freezing cylinder. Must be
lubricated.
9.) O-RING-AIR BLEED PLUG: Seals
the air bleed plug in the head.
184957 9
Twin Twist Soft Serve Freezer Model 957RMT
4 Part Names and Functions (continued)
Figure 4-2 Beater Shaft Assembly
10 184957
Twin Twist Soft Serve Freezer Model 957RMT
4 Part Names and Functions (continued)
The following descriptions apply to gure 4-2. The number preceding the part
name corresponds to the number in the gure.
1.) BUSHING - CYLINDER: Holds the
beater in place at the front of the
cylinder.
2.) SHAFT - BEATER: Rotates in the
freezing cylinder, blending air and mix
as it ejects product.
3.) BLADE - SCRAPER: Scrapes the
frozen product from the freezing
cylinder wall
4.) O-RING-SHAFT SEAL: Seals the
beater shaft to the shaft seal. Is
inserted into the shaft seal washer.
Must be lubricated.
5.) WASHER-SHAFT SEAL: Holds the
shaft seal o-ring. Lightly lubricate
the side opposite the cup seal.
6.) SEAL(CUP)-BEATER SHAFT: Seals
the opening between the freezing
cylinder and the beater shaft. Do not
lubricate rubber cup portion.
184957 11
Twin Twist Soft Serve Freezer Model 957RMT
4 Part Names and Functions (continued)
CLAMP-SOFT HOSE
O-RING
PORT-AIR/MIX INLET
CLIP-TUBE RETAINER
AIR METER
TUBE-AIR
RETAINER-AIR TUBE
CLAMP-SOFT HOSE
CLAMP-SOFT HOSE
ARM-SWING CLAMP
SHOE-SPRING
KNOB-HAND
COVER-MTS
TUBE-ASSY
PICKUP
HOSE-MIX BRAIDED
SUPPORT-ROLLER
BEARING
HOSE-TRANSFER
RED LINE
ROLLER-ASSY
COMPLETE
SHOE-ROLLER
18
DUCKBILL-INLET
Figure 4-3 Mix Transfer System (MTS)
12 184957
Twin Twist Soft Serve Freezer Model 957RMT
4 Part Names and Functions (continued)
The following descriptions apply to gure 6-3. The number preceding the part name
corresponds to the number in the gure.
1.) SUPPORT - ROLLER BEARING:
Holds roller assembly in place.
2.) SHOE - ROLLER: Provides an
opening to insert the mix transfer hose.
Squeezes transfer hose against rollers.
3.) ROLLER ASSEMBLY COMPLETE:
Squeezes mix/air through tubing to
freezing cylinder.
4.) KNOB - HAND: Locks roller shoe in
position.
5.) CLAMP - SHOE: Swings hand knob
into position over roller shoe.
6.) RETAINER - AIR TUBE: Holds air
meter tube in the “up” position.
7.) AIR METER: Regulates the amount of
air being drawn into the system.
8.) TUBE - AIR: Provides connection for
the air meter.
9.) CLAMP - ASSY. SOFT HOSE 5/8”:
Prevents mating parts from leaking.
10.) HOSE - ASSY. MIX BRAIDED:
Connecting tube between the Mix
Transfer System and the cylinder inlet.
11.) COVER - MTS: Protection against
moving parts. Cover must be in place
for the MTS to operate.
12.) HOSE - TRANSFER RED: Special “redlined” hose that is squeezed by rollers
to transfer mix to freezer.
13.) TUBE - ASSEMBLY MIX INLET:
Carries mix from mix container to MTS.
14.) DUCKBILL: A rubber check valve that
prevents mix from falling back into the
mix container.
15.) PORT - AIR/MIX: Blends air and mix as
it ows into the transfer hose.
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Twin Twist Soft Serve Freezer Model 957RMT
5 Operator Controls
Refer to gure 5-1 on the following
page for location of these controls and
indicators on the 957RMT.
NOTE: The dispense head must be in
place before the freezer will operate.
CAUTION
Test operation of the head
switch prior to placing
the freezer in service.
See Section 11, Routine
Maintenance, Monthly.
Figure 5-1
1. Selector Switch
This three-position switch controls the
functions of your freezer.
A. “CLEAN” (Left Position) - This
position operates the beater only (no
refrigeration to the cylinder). Always
use this mode in all cleaning and
sanitizing operations.
B. “OFF” (Center Position) - In this
position the beater motor will not
operate and no refrigeration will be
provided to the cylinder.
C. “AUTO” (Right Position) - This
position activates both the beater
motor and refrigeration unit. This is
the normal operating position.
IMPORTANT:
DO NOT use the AUTO position with
water or sanitizer in the cylinder—the
freezer will be damaged.
14 184957
Twin Twist Soft Serve Freezer Model 957RMT
5 Operator Controls (continued)
2. Mix Transfer System (MTS) Switch
This three-position switch controls the
operation of the MTS located in the
refrigerated mix storage cabinet.
A. “MIX ON” (Left Position) - Use this
position when the freezer is in the
normal operating mode and/or when
the product is being removed from the
cylinder.
3. Cabinet Switch
This two-position switch controls the
cabinet refrigeration.
NOTE: The cabinet door must be closed
for cabinet refrigeration to operate.
A. “ON” (Left Position) -
The cabinet thermostat controls the
system refrigeration to maintain a
temperature of 36º - 40ºF (2º- 4ºC)
in the storage cabinet. This position
must be used when mix is in the
storage cabinet.
B. “OFF” (Center Position) - In this
position the MTS will not operate.
B. “OFF” (Right Position) - The cabinet
will not be refrigerated in the “OFF”
position, unless either selector switch
is in the “ON” position.
NOTE: The cabinet is automatically “ON”
when either selector switch is in the
“AUTO” position.
4. Timer
This control will bypass the thermostat,
forcing the compressor and beater motor
to run for approximately 3 minutes.
Use the timer for quick start-ups or fast
recovery when dispensing large portions.
5. Reset - Overload
This control protects the beater motor
against failure from an overload condition
by automatically shutting down the
freezer. To restart properly, turn the
selector switch to “OFF”, wait 2-3 minutes,
then depress the red reset button and turn
the selector switch back to the “AUTO” or
CLEAN” position.
IMPORTANT:
Excessive use of the timer causes
freeze-up and damage to the freezer.
IMPORTANT:
If the overload trips frequently, your
freezer should be checked for proper
product temperature, overrun and
voltage. Contact H.C. Duke & Son,
Inc. or your local refrigeration service
company.
184957 15
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