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INDUSTRIAL & PROFESSIONAL
STM PRODUCTS s.r.l.
Via Schiaparelli, 15 | 37135 VERONA | ITALY |
WATER CHILLERS
Tel. +39 045 585700 | Fax +39 045 585730 |
info@stm-products.com | www.stm-products.com
TRADITIONAL WATER CHILLERS
DIRECT CHILLERS WITH COIL INSIDE THE TANK
They cannot reach 2°C
The cooling process is very slow
The tank is difficult to clean
There is a sanitation risk being the tank normally over-dimensioned
The output flow for a water delivery is slow being the pump installed
normally under-dimensioned
Normally they are controlled by a simple thermostat
INDIRECT CHILLERS WITH DOUBLE COIL INSIDE THE TANK
They can deliver water at 2°C only at the beginning, but soon after the
temperature increases considerably
The output flow for a water delivery is very slow
STM WATER CHILLERS
THE HIGH TECHNOLOGY ADVANTAGES
The temperature is constantly kept at 2°C inside the tank
The temperature remains constant during the whole water delivery
After the end of each water delivery, the new incoming water is cooled
again in few minutes therefore cool water will be available for the next batch
The evaporation process takes place inside a stainless steel plate heat
exchanger. The high efficiency of this device speeds up the water cooling
with the advantage of using not over-dimensioned tanks
The pump used for the water circulation through the heat exchanger is the
same that is used to feed the doser-mixer with the result of a high rate flow
The STM chillers are controlled with an STM microprocessor control board
with an LCD user interface
MACHINE CONCEPT
THERMODYNAMIC CIRCUIT
In the evaporator the refrigerant absorbes heat from the
water to be cooled
The vapour coming out from the evaporator is
compressed by the compressor increasing its
temperature
The overheated vapour enters into the condenser where
it transfers to the external ambient the heat absorbed
from the evaporator and compressor
The liquid coming out from the condenser is laminated
to low temperature by the thermostatic valve and returns
to the evaporator
WATER CIRCUIT
Cooling phase: the pump circulates the tank water
through the evaporator while the compressor is working
Delivery phase: the pump sends the water to the doser
Charging phase: at the end of a delivery, the charging
valve opens till the tank is full. At the same time the
cooling phase starts too. Thermostating phase: an hysteresis parameter controls the start of the
compressor to keep constant the tank temperature
TECHNICAL CHARACTERISTICS
OF THE MACHINE
Whole structure in AISI 304 stainless steel
AISI 316 stainless steel plate heat exchanger
Hermetic compressor for R404A gas in case of standard ambient
conditions or R134a gas in case of high ambient temperatures
AISI 316 stainless steel pump for water recycling and delivering
Safety devices: double pressure switch and relief valve
High precision temperature probe
Overflow drain
CHARACTERISTICS OF THE
MICROPROCESSOR ELECTRONICS
Alphanumeric LCD back-lighted display
Control of the machine’s normal function
Weekly program for automatic daily self switch-on, helping to save energy
Self-diagnosis
Automatic self-cleaning system, awarded with the Innovation Trophy at the
Europain fair of Paris. During this process a detergent solution is circulated
by the pump through the tank and the evaporator
Remote pump control from a water doser: the STM doser-mixer is the ideal
coupling for the SCWR-D PRO water chiller
THE ELECTRONICS FUNCTIONS
To change the language
To choose between Metric or Imperial units
To set the water temperature
To program the weekly automatic self switch-on
To set the day, time and length of the self-cleaning processes
To manage the alarms and the cleaning process
To check the inputs and outputs
USER INTERFACE
LEDS
Power supply
Compressor
Condenser fan
Process water pump
Process water tank full
Delivery in progress
Washing in progress
KEYBOARD
To switch-on and switch-off manually the chiller
To set the tank water temperature
To increase and to decrease the values
To program the weekly automatic switch-on of the machine
To set the clock and to cancel the alarms
To start a washing
SCWR-D PRO SERIES
W D H
100/50 70 50 20 ÷ 50 2200 7,2 / 10,6 / 26,0 208V - 1 - 60 Hz 150
180/50 130 50 20 ÷ 50 3800 10,5 / 16,1 / 51,0 208V - 1 - 60 Hz 165
265/70 190 70 30 ÷ 80 5500 9,7 / 14,8 / 45,0 208V - 3 - 60 Hz 205
365/70 260 70 30 ÷ 80 7700 13,1 / 18,3 / 55,0 208V - 3 - 60 Hz 240
530/70 380 70 30 ÷ 120 11100 19,2 / 31,8 / 106,0 208V - 3 - 60 Hz 250
WEIGHT
[kg]
DIM ENSIONS [ m m ]
MODEL
PRODUC T IO N
[L/h]
TANK
[L]
FLOW
[L/m in]
COOL ING
POWER [W]
ABS ORBED CURRENT
RLA/MAX/LRA [A]
ELECTRIC SUPPLY
720 640 1250
760 790 1550
the professional water chillers - R404A gas standard version
The hourly production is referred to the following project and testing conditions:
ambient temperature = 25°C
inlet water temperature = 25°C
full tank emptying batch
cooling down to 2°C
Working limits:
max ambient temperature = 38°C
max inlet water temperature = 35°C
max ambient+inlet temperature sum = 60°C
SCWR-TR-D PRO SERIES
W D H
100/50 70 50 20 ÷ 50 2200 8,7 / 12,4 / 47,0 208V - 1 - 60 Hz 150
170/50 120 50 20 ÷ 50 3500 11,5 / 18,7 / 50,0 208V - 1 - 60 Hz 175
225/70 160 70 30 ÷ 80 4700 10,4 / 26,8 / 99,0 208V - 3 - 60 Hz 220
350/70 250 70 30 ÷ 80 7400 15,0 / 28,0 / 99,0 208V - 3 - 60 Hz 250
460/70 330 70 30 ÷ 120 9700 20,2 / 33,9 / 128,0 208V - 3 - 60 Hz 260
WEIGHT
[kg]
DIM ENSIONS [ m m ]
MODEL
PRODUC T IO N
[L/h]
TANK
[L]
FLOW
[L/m in]
COOL ING
POWER [W]
ABS ORBED CURRENT
RLA/MAX/LRA [A]
ELECTRIC SUPPLY
720 640 1250
760 790 1550
tropical version with R134a gas for high ambient temperatures
The hourly production is referred to the following project and testing conditions:
ambient temperature = 35°C
inlet water temperature = 25°C
full tank emptying batch
cooling down to 2°C
Working limits:
max ambient temperature = 50°C
max inlet water temperature = 45°C
max ambient+inlet temperature sum = 85°C
SCWR-D & SCWR-TR-D SERIES
W D H
600/140 430 140 30 ÷ 120 12400 13,2 / 31,8 / 106,0 208V - 3 - 60 Hz 380
800/140 570 140 60 ÷ 220 16700 28,2 / 44,4 / 137,0 208V - 3 - 60 Hz 390
980/140 700 140 60 ÷ 220 20600 35,3 / 48,4 / 155,0 208V - 3 - 60 Hz 395
1050/280 760 280 80 ÷ 310 22200 35,3 / 45,0 / 155,0 208V - 3 - 60 Hz 430
1600/280 1140 280 80 ÷ 310 32300 42,8 / 61,0 / 210,0 208V - 3 - 60 Hz 475
2550/280 1820 280 80 ÷ 310 50500 60,7 / 93,0 / 314,0 208V - 3 - 60 Hz 615
WEIGHT
[kg]
DIM ENSIONS [ m m ]
MODEL
PRODUC T IO N
[L/h]
TANK
[L]
FLOW
[L/m in]
COOL ING
POWER [W]
ABS ORBED CURRENT
RLA/MAX/LRA [A]
ELECTRIC SUPPLY
1430 890 1710
+ remot e condens er
1430 890 1710
360/140 260 140
60 ÷ 210 8800 11,5 / 20,3 / 80,0 400V - 3 - 50 Hz 380
490/140 350 140 60 ÷ 210 11200 14,7 / 26,8 / 90,0 400V - 3 - 50 Hz 390
760/140 540 140 60 ÷ 210 16300 17,9 / 34,8 / 115,0 400V - 3 - 50 Hz 395
810/280 580 280 100 ÷ 360 17400 18,1 / 35,0 / 115,0 400V - 3 - 50 Hz 430
1250/280 910 280 100 ÷ 360 26200 25,2 / 55,0 / 210,0 400V - 3 - 50 Hz 475
1850/280 1320 280 100 ÷ 360 37200 32,6 / 77,0 / 260,0 400V - 3 - 50 Hz 495
+ remote condenser
1430 890 1710
1430 890 1710
Industrial water chillers – standard R404A gas and tropical R134a gas versions
8770047 rev 3 - oct 2012
What makes the STM water chiller better than others?
It supplies water at the desired temperature during all the working day, thanks to
the high efficiency of its plate heat exchanger
It allows to have the water at 2°C constantly
The tank has just the capacity for each delivery
It saves energy, thanks to the automatic switch-on weekly program
STM electronics controls every phase of the process
CONCLUSIONS
The automatic self-cleaning system
It is produced in order to satisfy the customer requirements
There is a model for each installation
It is not more expensive, especially if the compressor power is compared to other
machines
It is perfectly bound together with the STM water doser-mixer, the most reliable on
the market
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