CHILLERS

WHY BUY UNITROL CHILLERS?

Unitrol has since 1971 only manufactured “AUTOMOTIVE GRADE” chillers which come complete with features that are extra cost or not available on their line of  “commercial grade” chillers.  And yet the cost to you is about the same. And when you add the cost they charge as options for these features, Unitrol comes out at a lower cost.

These features are supplied at no extra cost to handle continuous operation at full capacity under the harshest of industrial conditions. These features, supplied standard with all Unitrol chillers, can save upwards of $1,700.00 in cost over other chillers.

• AUTOMATIC WATER REFILL VALVE. This is an option for commercial chillers and costs about $175.00 and up and is standard on Unitrol chillers.

• LOW WATER FLOW SAFETY SWITCH to protect refrigeration components stops the compressor if a fault occurs that could freeze the system. This is about a $300.00 option on other chillers but standard on Unitrol chillers.

• BACKFLOW KIT : to prevent water overflow in tank when system is shut off. Kit includes zero pressure water solenoid valve, and check valve. Supplied on 5-ton or larger chillers. This is a $300.00 - $400.00 option on other chillers. They are standard on Unitrol chillers.

• STAINLESS STEEL BRAZE PLATE EVAPORATOR, mounted outside of water tank.  Our outside stainless steel evaporator produces the maximum cooling efficiency possible to get more than the “nominal” rating out of our chillers at all flow rates. Many other companies put a finned evaporator coil inside their tank.

•     This is a major service problem because service or inspection of the coil requires removal of the water tank.

•     A coil inside the tank has low water flow across the fins to cause clogging that continues to lower efficiency and ability to cool the water.

• SELF-CLEANING EVAPORATOR: Because of the high flow rate through our outside evaporator, the Unitrol system is self-cleaning. Since water flow across the evaporator coils inside other brand chillers tanks is not uniform, chiller efficiency at low to medium flow rates is poor, and the fins on the in-tank evaporators have to be periodically cleaned.

• STAINLESS STEEL WATER PUMPS. This increases pump efficiency and eliminates corrosion found in other types of pumps.

• LOW WATER- FLOW BYPASS VALVE to allow use of chiller at any external water flow level and still prevent water freezing in the evaporator. This recent addition to our chillers allows outside flow to be 0 – maximum without effecting chiller operation. The bypass will always keep a balanced flow through the evaporator and not deadhead the water pump (saves seals). This is a $120.00 option on many other brand chillers but standard on Unitrol chillers.

• PHASE ROTATION / PHASE DROPOUT PROTECTION on 7-1/2 ton and larger chillers to prevent reverse operation of scroll compressors. This is not standard on commercial chillers and saves compressor destruction especially during initial installation. Cost is typically $180.00 on other chillers but standard on Unitrol chillers.

• SEAMLESS NON-METALLIC WATER TANKS with non-metallic and brass fittings. We have found these tanks to be 100% without leaks since the first chiller in 1971.

• RETURN WATER FILTER/STRAINER with live flush valve prevents contaminants from reducing the efficiency of the cooling evaporator and also prolongs the life of the water pump. This option can cost $175.00 on other brand chiller but standard on Unitrol chillers.

• AIR INTAKE FILTER, washable. This is not available on most commercial chillers. We feel that a chiller operating in typical factory conditions should have the ability to trap dirt and oils on a filter and not on the condenser coils. Because of this standard air intake filter system, our chillers do not require periodic flushing and chemical cleaning of the evaporator coils. This feature can cost $250.00 or more on commercial chillers and is standard on Unitrol chillers.

• SERVICE “ HOT ” ability. All inspection and adjustments can be done with all outside panels removed. This is required for automotive chillers since they do not want to take a line down while doing inspection or minor repair (hose leaks, etc.) on a chiller. You cannot do this on most commercial chillers since removing the panels on an operating chiller will run the pressure to the high limit and turn the compressor off.

• ELECTRONIC DIGITAL CONTROLLER: Single stage for 10-ton and smaller chillers, dual and triple staged for 15-ton or larger chillers for maximum efficiency. This is a $100.00 option for other manufactures on smaller chillers.

• NON-FERRIS FITTINGS on all water passage fittings to prevent internal rust accumulation and allow use of the chiller on a wide variety of fluids.

TYPICAL APPLICATIONS

Customizing a UNITROL Chiller: UNITROL can modify any chiller model to handle special applications such as:

Non-Refrigerated Coolers: UNITROL also manufactures non-refrigerated systems that will cool water down to as low as 5°F above room temperature. These systems include a fine-finned radiator, water tank, water pump and controls. Sizes range from nominal 24,000 BTU/Hr to 1,000,000 BUT/Hr.  Contact UNITROL sales to select the appropriate model number.

Outdoor Applications: Chillers can be ordered with outdoor kits installed for use in any ambient temperature.

Water Cooled Chillers: Standard model chillers are provided with Air Cooled Condensers. UNITROL can also provide any of our chillers with Water Cooled Condensers.

WATER CHILLER AND INLINE BOOSTER MASTER CHART

CHILLERS: These units are self-contained and include a WATER TANK and WATER PUMP. Chillers recirculate water and are considered "Closed Loop" systems.

INLINE BOOSTERS: Boosters use water supplied from an outside source and do not include a WATER TANK or WATER PUMP. Inline Boosters do not recirculate water.

NOTES:

1. CHILLERS include a WATER TANK and WATER PUMP. Other size water pumps are available to produce higher water pressure or water flow rates.

2. INLINE BOOSTERS use water pushed from an outside source and do not include a WATER TANK or WATER PUMP.

3. REMOTE CONDENSER: Models ending with "R" are shipped in two pieces. The inside component contains water tank, water pump, controls, and cooling evaporator. The outdoor component contains compressor, and heat-producing condenser. Customer field installation of refrigeration piping and electrical control lines is required. Dimensions shown are for the inside components only.

4. RESISTANCE WELDING APPLICATIONS: When used to chill resistance welders. this column is calculated to cool up to the listed quantity of 75 KVA or smaller single point spot welders under typical conditions. For other applications consult Unitrol for sizing assistance.

5. MODEL 8000 is designed to chill one spot welder (40 KVA or smaller) or up to two 250A TIG welders. It can also be used for small laboratory processes.

6. These Models are dual compressor systems. They are supplied in two modules, each with the dimensions shown. The total weight for the two modules is as shown on the chart.

USING UNITROL CHILLERS FOR RESISTANCE WELDING APPLICATIONS

UNITROL chillers are designed to handle a large variety of industrial water cooling applications. Over the years, UNITROL has produced a large volume of chillers for use in resistance (spot) welding applications. Our experience in sizing chillers used in welding lines allows us to provide the most economical match of chiller and application.

WHY YOU NEED THE UNITROL SYSTEM FOR YOUR WELDING LINE

All UNITROL Spot Welder Chillers are self-contained, closed-loop refrigeration systems which recirculate a continuous supply of cold water virtually eliminating all water consumption. This means it's unnecessary to use city or well water which presently contaminates your water lines. So down-time for cleaning and descaling of mineral deposits is totally eliminated.

Consistent pressure and low temperature is also maintained in the cooling water, helping to reduce down-time for copper tip replacement as much as 50%. Your weld quality and uniformity is also greatly improved. The result is increased production, more efficient operation, more actual output hours. After all, it's only when your machines are running that you're turning out billable product.

UNITROL CHILLERS PAY FOR THEMSELVES IN THE FIRST YEAR

You will immediately realize an impressive increase in quality production and output hours with drastic reduction of costly tip replacement. As an example, an elimination of as little as 10 minutes per day of tip dressing represents a typical annual savings per operator of over $1,000.00. By adding the elimination of costly water, high sewer taxes, and EPA mandated water processing, you can easily realize a payback of the entire chiller cost within 5 to 12 months.

Another money saving tip: The air exhaust from the chiller can be used to heat your building, and the heat can be exhausted out during the warm months.