Geothermal

Scroll Compressor 2 Stage

R410-A Refrigerant

Coaxial Heat Exchanger Copper

Floating Base Pan

Standard

TXV Valve

Unit Protection Module 1

Filter Drier

Comfort Alert Diagnostics Module

Compressor Blanket

Coaxial Heat Exchanger Cupronickel

Desuperheater

Water to Water Unit Mounted Controller

Optional

Key FeaturesTW SERIES

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Standard

GeothermalThis unit comes ready for geothermal application.

Scroll Compressor 2 StageThe performance of regular scroll compressors is taken to the next level with these two stage units. A simple solenoid valve bypasses refrigerant providing two stages of operation. This feature translates into the most efficient unit performance on the market today, ensuring you peak performance and energy savings under widely differing operating conditions.

R410-A RefrigerantBosch’s entire product line features the environmentally friendly R-410A refrigerant. R-410A is a non-ozone depleting refrigerant since it does not contain any chlorine. R-410A is classified as an HFC (Hydrofluorocarbon) refrigerant as it only contains Hydrogen, Fluorine and Carbon. This refrigerant is the industry’s replacement for refrigerant R-22.

Coaxial Heat Exchanger CopperOversized coaxial refrigerant to water heat exchangers are standard in all units. The customer can choose between Cupronickel or Copper coils. These coils are designed to allow optimal heat transfer while offering extremely low pressure drop. This unique low pressure flow design reduces the amount of pumping power necessary to achieve optimum water flow in order to maintain the efficiency of the unit. Coaxial heat exchangers are not as susceptible to clogging and freezing as are plate heat exchangers. All geothermal units come standard with a wrapped insulated coaxial heat exchanger. The insulation wrap prevents condensation from forming in low temperature operations.

Floating Base PanThe floating base pan isolates the compressor from the cabinet and absorbs the vibration energy so that it does not get transmitted to the space. Even under normal operating conditions vibration may be transmitted to the building and introduced into the space as noise. This feature, unique to Bosch is standard in all of our units to ensure quiet operation.

TXV ValveHigh quality thermal expansion valves (TXV) allows for greater flexibility in operation over a wider range of conditions allowing them to closely match the demand of the unit and run at optimal efficiency. The TXV is installed in the compressor section for easy access and servicing.This feature, unique to Bosch is standard in all of our units to ensure quiet operation.

Key FeaturesTW SERIES

Unit Protection Module 1The Unit Protection Module UPM1 is standard on most single compressor Bosch units and was developed to enhance their operation.The (optional) freeze protection will prevent unit operation below either 35° F (1.7° C) or 15° F (-9.4° C) leaving fluid temperature depending on the dip switch setting. Each controller has a random start feature

programmed into its microprocessor ranging from 270 – 300 seconds preventing the simultaneous starting of multiple units. An anti-short cycle timer allows a 5 minute delay on break timer to prevent compressor short cycling. A low pressure bypass timer switch prevents nuisance lockouts during cold start up. The high pressure switch delay of one (1) second provides switch stabilization on start up to prevent nuisance lockouts.

The Unit Protection Modules monitor the operating condition of the unit by providing:

A Brownout / Surge / Power Interruption

Protection against high or low pressure conditions preventing potential compressor damage.

Malfunction Output - The controller has a set of contacts for remote fault indication. These may be set for either a pulsed or constant output as well as providing either a 24 volt or dry contact closure.

Test / Service option - A dip switch is provided to reduce all time delay settings to 6 seconds during troubleshooting or operation verification.

L.E.D. Indicators for fault identification and power.

Intelligent Reset. Two or four attempts to restart before going into a hard lockout requiring manual reset. Dip switch adjustable.

Filter DrierA filter drier absorbs moisture that may be contained within the refrigerant system. Moisture is detrimental and can possibly damage the compressor when it mixes with the refrigerant.

Comfort Alert Diagnostic ModuleThe Alert Diagnostics module is installed in the electrical box of our units. The tool monitors data from the thermostat and compressor and records any malfunction of the system. LED lights provide the alert code and lead the service technician to the cause of the malfunction. The Alert Diagnostics module can significantly reduce maintenance by improving system diagnostics by up to 75% over systems without this feature.

Compressor BlanketA high density compressor blanket together with the unique floating base pan can reduce sound levels by up to 60%.

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Key FeaturesTW SERIES

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Key FeaturesTW SERIES

Optional

Coaxial Heat Exchanger CupronickelIn ground water geothermal applications, the Cupronickel option provides additional corrosion protection in situations where the water may contain a higher level of chemicals.

Desuperheater*A desuperheater or HRP (Hot Water Heat Recovery Package) is a feature that takes advantage of waste heat of the compressor and uses it to heat domestic water. Heating your water with FREE waste heat will reduce the use of your inefficient water storage tank heating elements. Hot water is produced by using a double wall coaxial heat exchanger coil. The hot refrigerant gas flows in the outer tubing while the domestic water flows in the inner pipe being heated by the hot refrigerant. The HRP heats water with superheated gas that is being produced by the compressor as you heat or cool your space, thus saving you money in your hot water production.

Water to Water Unit Mounted ControllerBosch’s water to water heat pump controller offers a low cost, simple solution to the control of a water to water heat pump unit. The control is configurable to provide cooling only, heating only or auto change over control strategies based on the application of the unit in a given system.

Features:

Selectable mode of operation. Cooling, Heating or Auto Changeover.

Adjustable temperature differential for heating and cooling set point.

Adjustable auto changeover set point with adjustable dead band setting.

Intelligent auto reset of a fault condition avoids nuisance hard lockouts.

LED display of control temperature and set points.

F or ˚C Display.

Pump operation configurable for continuous or cycling operation with the compressor.

Malfunction output and service LED can be set to steady or pulsing to indicate fault condition.

Color LED’s indication of mode of operation.

Set points retention in non volatile memory in the event of a power failure.

Five minute delay on break or power interruption for compressor short cycling protection.

Brown out low voltage protection

All of the unit’s safeties are tied back into the controller for system protection.