Grindmaster PM45-B, PM4-B User Manual
GRINDMASTER CRATHCO SYSTEMS, INC.
Crathco®Post Mix Beverage Dispensers
Operation and Instruction Manual
Model PM4-B & PM45-B
TABLE OF CONTENTS
Warnings and Safety Precautions..................2
Installation ..................................................3-5
Operating and Adjustments.........................5-7
Care and Cleaning......................................7-9
Maintenance Service ................................9-10
Troubleshooting.......................................11-16
Exploded Views ......................................17-23
for
Electrical Diagrams.................................24-25
Refrigeration Diagram..................................26
Prior authorization must be obtained
from Grindmaster Crathco Systems for all warranty claims.
MODEL PM4-B
480 Neponset Street
Canton, MA 02021 USA
(617) 828-1250
FAX (617) 828-9617
www.grindmaster.com
Grindmaster Crathco Systems, Inc., 2000
PRINTED IN THE USA
0700 Form # CC-398-03
Part # 9408
WARNING LABELS AND SAFETY PRECAUTIONS
OPERATOR'S SAFETY PRECAUTIONS
1. Read and understand the operating instructions in this manual thoroughly.
2. Note all warning labels. If any of the warning labels are missing or damaged replace them immediately.
3. Keep operating area clean.
Located on the top of the condenser shroud and on the rear panel.
INTRODUCTION
The GRINDMASTER CORPORATION dispenser is a unique, self contained, counter top style unit with high
capacity self-adjusting cooling systems. Both cooling systems: patented cabinet cooling system and ice-bank
water cooling system do not require manual adjustment or settings. There are no Electromechanical thermostats
to control the cooling systems.
The cabinet cooling system is a frost-free system that maintains not only desired temperature, but also a constant
humidity level in the cabinet with exception to the time when the cabinet door is open.
The dispensing buttons are located on the front panel, and are easily accessible by the operator. The system is
powered with safe 24 VDC as well as a water inlet solenoid valve and an electronic controller.
The machine has accessible modular construction and has been designed to be simple, yet effective, to provide
many years of trouble-free operation.
Page 2 Crathco® Post Mix Beverage Dispensers
INSTALLATION
Installation Notice
A water filter is recommended for the water supply to the dispenser, especially in areas where water contains a
high level of minerals such as calcium or other solids. Over long periods of time, calcium deposits build on
heat-exchanger coils and will lower the cooling capacity of the system. Calcium build up will also occur on the
strainers enclosed in the dispensing valves.
The cooling system is provided with copper coils, designed to last the life of the dispenser. However, some
chemicals in treated or not treated water, specifically chlorine and sulfur (sulfide) may shorten the life of the coils.
The initial investment in the filtering system will pay for itself in quality and by ensuring longer life for the
machine.
Unpacking
1. With the unit upright, remove staples from the box at the very bottom around perimeter of the box and on the
top of the box.
2. Open the top of the box and remove the accessory box.
3. Slide the box tube upward exposing the machine.
4. Remove supporting corners and front supporting block.
5. The unit must have the legs installed upon removal from the packaging. Legs are supplied in the acces-
sory kit (box on top of the machine in the packaging.)
Failure to install the legs will cause the dispenser refrigeration system to work improperly and burn out as
well as possibly damage the water inlet valve.
6. Support all 4 sides, lift and place in an appropriate area. (See location below)
Installing Your Unit
CAUTION: DO NOT ALTER OR DEFORM THE PLUG IN ANY WAY!
!
ALTERING OR DEFORMING THE PLUG MAY DAMAGE UNIT AND WILL VOID WARRANTY!
1. Location
Position dispenser in a well-ventilated area indoors. Avoid exposure to direct sunlight and/or heat caused
by radiation. Ambient room temperature must be in the range of 60Þ - 90ÞF (15-32ÞC). Do not install unit
in an enclosed area where heat build up could be a problem.
Note: Air flow direction and spacing required on Figure B page 4.
2. Plumbing
Connect the dispenser to cold, potable water source suitable for drinking.
Do not install unit on a water softener/softening line. For proper operation incoming supply water pressure
must be in the range 29 psig (2 - 2.75 bar), therefore a water pressure regulating valve is recommended.
3. Electrical
This unit is supplied with a 6” (2m) long 2 wire plus ground power cord. The PM45-B connector is suitable
for standard single phase 220V/50Hz power supply. PM4-B models should be connected to a 115V 60 Hz
power supply. This cord exits the unit out the bottom of the base and should be routed per National Electric
Code.
Crathco® Post Mix Beverage Dispensers Page 3
WARNING: Only a qualified service technician should service internal electrical components.
Installing Your Unit (cont.)
4. Water Hook-up.
It is recommended to provide water connection to the dispenser from a dedicated
water line. Without this, consistent water pressure necessary to sustain proper brix
levels may not be maintained due to water surges caused by other water-consuming equipment, such as dishwashing machines, other dispensing equipment, coffee
machines etc!
The water line supply should be at least 3 2/5” (8 mm) internal diameter and must
be rated for 217 psig (15 bar) pressure at 70ÞF (21°C) water temperature.
Install a water pressure regulator gauge at the inlet to the machine and set it to
29 Psig (2 bar). The water pressure regulator gauge, is included in the Accessory
Box. It is important that the gauge is installed accordingly. (See figure A) Failure to
comply will damage the gauge and render it inoperable.
Filling the Ice bank with Water
1. Remove the rear upper panel from the dispenser.
(Figure A)
2. Find the Ice Tank Plug (round black rubber plug
about 1” (2.5 cm) diameter) on the top of the ice
Back of unit
Ice Tank Plug
bank cover and remove it.
Water Level
3. Use the water hose or funnel to fill the tank with cold
tap water (18 liters.)
4. Stop filling water once water is flowing from overflow
1.5 cm below top
cover
Water Level Gauge
Overflow
Drain
drain.
5. Look at the water level gauge (tank drain clear hose
attached to the insulated refrigeration line in upright
position.) The water level in the tank is equal to the
Air Out
›
›
›
water level in the water gauge and should be about
1.5 cm below ice bank cover. *(see Figure B)
6. Replace rubber plug and rear upper panel.
7. Turn the power switch ON.
(Figure B)
›››
Air In
Minimum Air Space Requirements
Top 12”
*To assure the proper operation of the dispenser, the water level in the
ice bank must be kept at the full fill level explained above. Water level
Sides 2”
Back 4”
in the ice bank should be checked every couple of months.
WARNING: Do not remove the water level gauge from its position unless you want to drain the water
from the ice bank.
Note: If the water level in the ice bank falls substantially (about 2”/5 cm), the refrigeration system will stop
operating. Before this happens, the loss of cabinet cooling will be observed.
Page 4 Crathco® Post Mix Beverage Dispensers
Installation (cont.)
POWER SUPPLY: 220 VAC 50 Hz 115/60Hz
COMPRESSOR: HP: 1/4, (630 Kcal, 2500 BTUH)
REFRIGERANT: R134a 260 grams/9.1 oz.
DESIGN LOW PRESSURE: Max. 9.5 BAR; 140 PSIG
DESIGN HIGH PRESSURE: Max. 16.3 BAR; 240 PSIG
SYSTEM TYPE: CAPILLARY TUBE, HERMETIC
IDLE POWER CONSUMPTION .5A .8A
RUN POWER CONSUMPTION 4A, 5A (MAX) 7A, 8A (MAX)
FUSE SIZE 6 A Slow Blow Controller
DISPENSING RATIO 50 ML/SEC
SUPPLY WATER PRESSURE 2 - 2.7 BAR; 29-40 PSIG
WORKING AMBIENT TEMPERATURE 15.5°C - 32.2°C 60-90ÞF(guaranteed performance)
PRODUCT STORAGE CAPACITY NOM. 4 LITERS (FOUR 1L TETRAPACK)
Specifications: PM45-B PM4-B
OPERATING AND ADJUSTMENTS
Explanation of terms
All descriptions related to dispensing heads, dispensing buttons,
pump motors such as: push button #1, dispensing head #2, pump
motor #3 etc. are used in relation to the front of the machine. This
relates also to all components inside of the machine that are
symmetrically positioned. (See Figure C)
For example:
Push button #1 - Far left positioned dispensing push button.
Push button #4 - Far right positioned dispensing push button.
Dispensing head #3 - All components involved when dispensing
caused by depressed push button #3.
Pump motor #4 - Pump motor that works when push button #4 was depressed and is positioned inside the
machine in line with push
button.
(Figure C)
Brix Setup
If initial concentrate brix is 60 and required mixing ratio is 6+1/6:1 (6 ounces water to one part concentrate),
then brix of ready to drink mixture of a concentrate and water should be 10.
To measure brix level, a refractometer is used to show sucrose content in a drink by measuring change of the light
diffraction in the water caused by change of viscosity due to sucrose content.
The correct ratio is achieved by controlling water and a concentrate flow to the mixing device, in this case mixing
chamber. Brix on each dispensing head is preset in the factory. In the field, the brix needs to be fine-tuned to the
Crathco® Post Mix Beverage Dispensers Page 5
correct value with the use of a refractometer. Setting brix by taste is an acceptable method and usually gives
+ 0.5-0.8 brix error.
Brix Setup (cont.)
Mixing water with a concentrate in this dispenser was designed at the following conditions:
1. The initial temperature of a concentrate (syrup) used in the dispenser should be 39-41ÞF (4-5°C).
2. The initial temperature of the water supplied by the dispenser cooling system is 39ÞF (4°C).
3. The static water pressure should be set to 29PSIG.
The pressure regulator gauge should show 29PSIG (2 bar) when there is no water flow.
It is very important to apply the concentrate at the noted temperature since a concentrate changes its viscosity
when it cools down. A dramatic change of the viscosity (thickness of concentrate) causes the pumps capacity to
change resulting in the need to readjust the brix level.
The machine provides cooling to keep syrups or concentrates in the correct temperature. If the initial temperature
of syrup or concentrate is the room temperature when the brix is set, after approximately one hour the syrup or
concentrate will be cooled down to 39-41ÞF (4-5ÞC). As a result your brix setting will change. Therefore it is recommended that syrup or concentrate should be refrigerated prior to setting brix.
Brix Set Procedure
The brix number for given flavors is shown in the table. If the table does not include information for a particular
flavor, temporarily use the taste method and request information from a concentrate supplier.
Assuming that correct temperature of orange concentrate is applied
to the first dispensing head and syrups are applied to the remaining
dispensing heads proceed as follows:
1. Set the water pressure to 2 bar (29 Psig) static.
2. Depress chosen dispensing push button and hold until water
from the dispensing nozzle changes color.
3. Release push button. Depress push button again dispensing
drink into the cup.
4. Measure a brix level. If the brix is too rich (higher number
than expected) the concentrate pump needs to be slowed
down by turning corresponding potentiometer on the controller
board counterclockwise (potentiometer called Pump #1 on the
controller board corresponds with push button #1 and so on.)
The controller board can be found on the right hand side in the front
of the machine behind the splash panel. If potentiometer is already
all the way to the left, the water pressure must be increased
assuming that a concentrate temperature is at 39-41ÞF (4-5° C). Please, note that water pressure change will
cause brix change on other dispensing heads if they were set previously. (See figure D)
(Figure D)
If brix is too weak the pump speed must be increased by turning the corresponding potentiometer clockwise.
If there is problem setting up brix, refer to brix problem troubleshooting.
Page 6 Crathco®Post Mix Beverage Dispensers
Once the brix is set, use the same flavor set up on each dispensing head. The flavor used on a particular
dispensing head can be changed if the brix and viscosity of the syrup remains the same.
Dispenser Operation Tips
1. To dispense the drink, depress and hold dispensing push button as long as needed.
2. After dispensing 2 liters consecutively allow a 15-30 second idling time before next usage.
3. Keep dispenser door closed and do not allow it to be open for a longer time than necessary.
4. Avoid a concentrate spillage inside the cabinet. If spillage occurs, clean immediately. If spillage is left
unattended, over time it will dry out and be difficult to clean.
Care and Cleaning
Flushing the Dispensing System.
1. Open the door cabinet and turn the flush switch to the FLUSH
Dispense
FLUSH
position. The flush switch is located on the inside wall of the
door and is labeled:
(Figure E)
By turning the switch to the FLUSH position the product pumps are disabled. The machine now can
dispense water only.
2. Close the door and depress the far left dispensing switch for 30 seconds. Repeat this operation with all
remaining dispensing switches.
3. Open the door and turn the flush switch to the DISPENSE position.
The flushing operation rinses the mixing chamber, static mixer, and dispensing nozzle. The flushing
operation is required every day at closing or when the machine will not be in use for more than four hours.
Note: Flushing the dispensing system does not cause loss of cooling capacity.
Washing Parts
Parts such as the dispensing nozzle, static mixer and pick up tube assembly must be washed consistently every
week to remove possible product build up. This will help to assure the correct mixing and dispensing of product
especially when the product contains a pulp.
Removal of these parts does not require use of any tools. This is a simple hand operation and requires luke warm
water and dishwashing detergent.
1. Flush dispensing system first.
Crathco® Post Mix Beverage Dispensers Page 7
Washing Parts (cont.)
2. Remove the dispensing nozzle from the machine by turning it 90° to the
left or right side, pulling it down. If there is a
problem pulling it down, turn the nozzle with quick short left to right and
back motions pulling it down at the same time. Make
sure that the nozzle is in the proper position. The flat part of the thin round
plate should be between
screw heads. Remove product pick up tubes from the product containers.
Note: Static mixer is inside the nozzle. If static mixer is lost, the product will not
mix properly. (See Figure F.)
3. Turn the dispensing nozzle upside down and remove static mixer.
Repeat the same with all remaining nozzles.
- - - -
4. Wash the parts with water mixed with hand dishwashing detergent.
5. Rinse all parts thoroughly, put static mixers into nozzle leg first and
install them back in the machine by inserting
into mixing chambers and locking
in positions. Failing to lock in position may cause dispensing nozzle with the
static mixer to be pushed rapidly out of the mixing chamber by the 29
Psig
(2
bar)
water
pressure and splash all surrounding with
mixed product. Replace product pick up
tubes.
Note: Wash on a regular basis the drip tray and the drip tray grill separately. (see figure G)
Sanitizing and Cleaning Dispensing System
Product Pumps System Cleaning
(Figure F)
(Figure G)
The product pumps system cleaning assures the performance of the pumping system and cleans the inside walls of tubing.
The product used is very thick (6+1 concentration or more) and will build up
a layer of sucrose and pulp mixture on the inside walls of tubing. This build up
narrows the inside diameter of the tubes and will restrict the product flow and
will slowly offset the brix. Proper cleaning of the pump system will help prevent and correct this condition.
1. Remove the product containers from the dispensing cabinet. Replace each container with any clean contain-
er (same capacity as product container) filled with warm water (40-45°C) and insert product pick up tubes
Page 8 Crathco® Post Mix Beverage Dispensers
(Figure H)
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