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TANDEM
COMPACT MODEL W020DZZ WATER COOLED DUAL CIRCUIT - DUAL SCROLL COMPRESSOR
CHILLER CAPACITY: 253,706 BTU (21.1 TONS) AT 44 F LEAVING WATER, 85 F ENTERING TOWER WATER. EER: 15.75 THESE ARE SOME OF OUR STANDARD BENEFITS:
COMPRESSOR:
Two independent suction gas cooled Copeland "SCROLL"
compressors with an EER of 15.7 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 cooling tower water 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:
OUTPUTS:
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. WARRANTY:2 YEAR parts warranty on the whole unit. AVAILABLE OPTIONS: Two-way and three-way motorized
condenser water flow control valve. |
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Tandem
Chillers Inc.
111 Esna Park Drive, Unit 7 Markham, Ontario L3R 1H2 |
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Tel:
1.877.513.8330 Fax: 905.513.8358 Email: sales@tandemchillers.com |