TANDEM COMPACT MODEL G020DSZ GLYCOL WATER COOLED DUAL CIRCUIT - DUAL SCROLL COMPRESSOR CHILLER CAPACITY: 227,869 BTU (19.0 TONS) AT 44 F LEAVING WATER, 105 F ENTERING GLYCOL WATER. EER: 11.6

THESE ARE SOME OF OUR STANDARD BENEFITS:

• 2 YEAR PARTS WARRANTY ON THE WHOLE UNIT.
• DUAL REFRIGERATION CIRCUITS.
• OVERSIZED, HIGH EFFICIENCY STAINLESS STEEL COPPER BRAZED EVAPORATOR.
• OVERSIZED, HIGH EFFICIENCY STAINLESS STEEL COPPER BRAZED CONDENSER.
• STAINLESS STEEL BOLTED FRAME, CONTROL PANEL AND ACCESS PANELS.
• CASTER ASSEMBLY THAT BOLTS TO FRAME WITH CASTERS THAT CRANK UP AND DOWN FOR EASY INSTALLATION AND REMOVAL OF CHILLER.
• SHUT-OFF VALVES ON EVAPORATOR AND CONDENSER ON MAIN HEADER FOR INDIVIDUAL CHILLER REMOVAL WITHOUT INTERUPTION TO THE SYSTEM.
• EXTERNAL BUS BAR DUCT WITH COMPRESSOR CIRCUIT BREAKERS FOR INDIVIDUAL CHILLER REMOVAL WITHOUT INTERUPTION TO THE SYSTEM.

COMPRESSOR: Two independent suction gas cooled Copeland "SCROLL" compressors with an EER of 11.6 for years of energy savings. Each compressor complete with internal overload thermal protection in motor winding, rubber mounting parts for vibration free operation, oil sight glass, crankcase heater, isolation valves, two steps of capacity control per chiller, 100% 50% and off, with automatic sequencing of compressors (lead / lag) for equal run time, extending compressor life.

EVAPORATOR: Oversized, high efficiency 20 ton dual refrigeration (10 ton/circuit) stainless steel copper braze plate evaporator insulated outside with 1/2" armaflex insulation, with an evaporator inlet water temperature sensor, inlet shut-off valve mounted to the main header and coupled with grooved-end pipe fittings to the evaporator.

Evaporator water outlet has a flow sensor and water temperature sensor, shut-off valve mounted to the main header and coupled with grooved-end pipe fittings to the evaporator. Water piping in and out is insulated with 1/2" armaflex pipe insulation.

An individual chiller can be removed without interruption to the main header supply and return water flows by closing the ball valves and undoing the grooved-end coupling.

CONDENSER: Oversized, high efficiency 20 ton dual refrigeration circuit (10 ton /circuit) stainless steel copper braze plate condenser with a condenser inlet water temperature sensor, shut-off valve mounted to the main header and coupled with  grooved-end pipe fittings to the condenser.

Condenser outlet side has a shut-off valve mounted to the main header and coupled with grooved-end pipe fittings to the condenser. Condenser leaving water temperature can be monitored if a second evaporator is not used.

The chiller can operate with dry cooler water/glycol as low as 70 F entering the condenser, maximizing the compressor efficiency while maintaining optimum expansion valve performance. This is the highest energy saving available to-day.

For water/glycol below 70 F a motorized condenser water flow valve can be installed and controlled by an exclusive “chiller control system” maintaining a constant safe operating head pressure.

An individual chiller can be removed without interruption to the main header supply and return water flows by closing the ball valves and undoing the grooved-end coupling.

CHILLER CONTROL: Our exclusive "intelligent chiller control system" surpasses all others with twelve (12) analogue inputs: eight temperature and four pressure, two  flow sensors, loss of phase and phase reversal, over and under voltage, phase voltage difference along with four digital inputs, one for each compressor motor internal sensor, one for pump interlock or local / remote start.

Our exclusive "control logic" insures long lasting trouble-free operation with alarm outputs before failures can occur, automatic compressor sequencing (lead/lag) to even run time, timed starts to ease inrush current.

Connected to our "master chiller system control" for staging of 12 chillers with a total 24 steps of capacity control, the “building control system” can monitor the status of all chillers and change the operating temperature set point. 

With an evaporator flow sensor, we can prevent freeze-ups before they happen and display the exact operating capacity in tons of each chiller any time during operation. 

Inspection or service is made easy by displays of all temperature and pressure inputs, evaporator flow, chiller capacity in tons and super heat of each thermal expansion valve.

SENSOR INPUTS:

• Suction and discharge pressures of each compressor.
• Suction and discharge temperatures of each compressor.
• Evaporator water inlet and outlet temperatures.
• Condenser water or air inlet temperature.
• Water out temperature for a second evaporator if required.
• One evaporator water flow sensor.
• One flow sensor for condenser water flow or for a second evaporator.

OUTPUTS:

• Six relay outputs for cycling of compressors, unloading solenoids or hot gas by-pass solenoid valves for capacity control.
• Two relay outputs for alarm fault conditions.
• Two 0 -10V outputs, one for a motorized condenser water regulating valve, one for a motorized evaporator water by-pass control valve, and in future it will be able to control an electronic hot-gas by-pass valve or electronic thermal expansion valve.

Our "intelligent chiller control system" insures both trouble-free operation without false trips, and also that the chiller operates at the highest efficiency all the time.

REFRIGERATION COMPONENTS: Refrigeration thermal expansion valve field adjustable, filter dryer, liquid line solenoid, liquid line sight glass with moisture indicator, liquid line shut-off valve and hot gas by-pass shut-off valve if hot gas used. Some of these components are not used in our competitors’ equipment.

Refrigeration circuits are piped with ACR type L copper and fittings, circuit is brazed using nitrogen to keep internal surfaces clean from scale buildup, evacuated and charged with freon. Each chiller is run tested and includes a "run test data sheet" for field comparison at chiller start-up.

CONTOL PANEL: NEMA 1 stainless steel control panel with compressor contactors, compressor circuit breakers located in bus-duct panel on top of chiller, two control transformers (one for each compressor) both with primary and secondary fuses, red emergency stop push button, control board, two line digital display and data entry key pad.

Our enclosed three phase 900 amp Bus Bar Duct System is external to the chiller and includes individual compressor circuit breakers. Our system allows for individual chillers to be removed from the main bus for service without shutting down the operating system.

FRAME: Rugged 12 ga. bolted stainless steel frame with stainless steel NEMA 1 control panel and bus duct panel, 20 gauge stainless steel access panels. The base has cutouts for either a fork lift or pallet truck and uses two of our bolt-on “caster assemblies”.  The casters can be cranked up and down to move the chiller into place or remove for service.

SIZE:         48"l x 24"w x 73"h.

WEIGHT:    1,166 lbs.

VOLTAGE:   230/460/575V, 3 phase, 60 hertz.
                  380V, 3 phase, 50 hertz. Capacity reduction of 0.83 at 50 hertz.

WARRANTY:  2 YEAR parts warranty on the whole unit.

AVAILABLE OPTIONS:

Two-way and three-way motorized condenser water flow control valve.       

Stainless steel main header water piping across the back of the chiller.

Sound attenuating panels.

Alternate refrigerants.

Hot gas by-pass for additional capacity control.

Semi-hermetic compressors.

NEMA 12 control panel.