Refrigeration System
!Compressor: The unit includes a high efficiency scroll compressor with and internal vibration isolator that absorbs starting and stopping energy. It also contains an internal overload protection. External vibration isolation is provided by rubber mounting devices located underneath the mounting base of the compressor.
!Water-to-Refrigerant Heat Exchanger: The water-to- refrigerant heat exchanger is a high quality stainless steel braze plate heat exchanger. This stainless material offers exceptional corrosion resistance. The heat exchanger has a working pressure rating of 450 psig on both the refrigerant and water sides. To help ensure clean water for the water-to-refrigerant heat exchanger, Trane recommends a sand filter/separator for open loop systems.
!Freezestat and Lock-out Relay: A freezestat is included to protect the unit from unusually cold loop fluid temperatures or no fluid flow conditions. A 35 degree F freezestat is necessary in open
loop applications and closed loop applications without adequate antifreeze. A 20 degree F freezestat may be used with closed loop applications with antifreeze solution only. A lockout relay circuit consisting of three safety devices (low pressure, high pressure, and Freezestat) will trigger the lockout relay to shut off the compressor, the loop pumps and the desuperheater pump (optional) when a safety is tripped.
A triggered lock-out relay is a key indication that there is a problem in the system and service may be necessary. The safety that caused the lockout relay to energize will reset itself after approximately five minutes. If the lockout relay is manually reset by power interruption prior to this five minute period, the unit will be unable to run. To manually reset the lockout relay, the disconnect or system switch at the thermostat must be toggled.
!Reversing Valve: The reversing valve is a pilot operated sliding piston type with replaceable encapsulated magnetic coil. The reversing valve is energized when
the unit is in the cooling mode and de-energizes in the heating mode.
!Refrigerant Tubing: All refrigerant tubing is constructed of copper. The low temperature refrigerant lines are factory insulated with a 3/ 8-inch thick elastomeric insulation (UL 94V-5 rated), with a flame spread rating of less than 25 and smoke density rating of less than 50. It has been tested in accordance with ASTM-85.
!Refrigerant Metering: The refrigeration circuit is provided with a bi-directional thermal expansion valve to allow operation with entering water temperatures from 25 degrees F to 120 degrees F.
!Liquid Line Filter: The unit contains a bi-directional liquid line filter drier to remove any contaminants within the refrigeration circuit.
!Servicing Pressure Ports: The equipment is provided with both high and low pressure schraeder ports. The ports are located outside the unit case for convenient access.
