valutazioni - 5, GPA: 3.8
(
)
)
|
Facilità d'uso
There are many load side applications for which the WPWD is suited. Typical usages include: • Hydronic baseboard heating • Radiant slab heating • Space heating or cooling with Trane fan coils • Ice and snow removal • High volume water heating (non potable) • Boiler replacement (@130 F) In the heating mode, the water-towater unit efficiently extracts heat from a water source (source side) such as a well, lake, boiler/tower loop or closed ground loop heat-exchanger, then transfers the heat to another flow of water (load side). The amount of heat added to the load side is greater than the amount taken from the source side. The electrical energy supplied to the compressor is added to the output heat of compression. The Trane water-to-water product package includes: • High efficient scroll compressor • Compressor protection • Water to refrigerant condensing coil • Freeze protection • Water to refrigerant evaporator coil • Expansion valve • Filter Drier • Reversing Valve • Internal desuperheater (optional) ©An American Standard Company 2 Table of Contents Introduction Features and Benefits Model Number Description General Data Application Considerations Electrical Data Performance Data Dimensional Data Wiring Diagram Accessory Options Mechanical Specifications 3 Features General and Benefits General The water source heat pump model WPWD (water-to-water) offers a range of capacities from 2 tons to 6 tons. All units are housed in one standard compact cabinet. Cabinet The cabinet, which allows easy access for installation and service, is constructed of heavy gauge metal. The cabinet finish is produced by a corrosion resistant electrostatic powder paint coating in the color “soft dove”. The top half of the diagonal cabinet is removable for access to the internal components by removing two screws. (See Figure 1). Figure 1: Unit access Insulation To reduce condensation and compressor noise, the cabinets are insulated with 1/2-inch thick, neoprene backed, acoustical fiberglass insulation. Compressor The model WPWD contains a high efficiency scroll compressor for reliable and efficient operation. The scroll compressor’s unique design lends itself to having one of the lowest sound levels in the industry. The compressor is internally isolated and placed on a stiff base plate designed to further reduce vibration noise. As an added benefit, the WPWD cabinet includes full length channel stiffeners underneath the unit. Heat Exchanger The water to refrigerant heat exchangers are made of stainless steel brazed plate. This design provides a larger amount of surface area for heat exchange between the water and the refrigerant. (See Figure 2 for cut-away). . Figure 2: Brazed plate heat exchanger Piping All low-side copper tubing in the refrigeration circuit is insulated to prevent condensation at low entering liquid temperatures. Filter Drier A filter drier is provided in each unit for dehydration and cleaning of the refrigeration circuit. This feature adds to the unit life. Expansion Valve As standard, Trane provides a balanced port thermal expansion valve. This valve precisely meters the refrigerant flow through the circuitry to achieve the desired heating or cooling over a wide range of fluid temperatures. Water Connections All water connections feature 1-inch brass swivel connectors. Because the connectors are swivel, a back-up wrench is not necessary when tightening. 4 Compressor Run Capacitor 2 Amp Fuse (for use with desuperheater option) 10 Pole Terminal Strip Low Voltage ThermostatLow Voltage High Voltage Figure 3: Controls Compressor Run Capacitor 2 Amp Fuse (for use with desuperheater option) 10 Pole Terminal Strip Low Voltage ThermostatLow Voltage High Voltage Figure 3: Controls Features Controls and Benefits 24V Power CompressorReversing Valve (energized in clg) Figure 4: Typical thermostat termination points 24 Volt Controls All electrical controls and safety devices are factory wired, tested, and mounted in the unit. The control package includes: • Compressor contactor • 24 Volt transformer • Lockout relay • Compressor run capacitor (1phase units only) • Reversing valve coil (For heat pump only) • Fuse (for desuperheater) A terminal strip with 1/4” fork connections will be provided for field thermostat control wiring. (See Figure 3). Safety Devices Each Trane water-to-water unit contains safety devices to prevent compressor damage. These include: • Low pressure switch • High pressure switch • Temperature sensor (freezestat) • Internal overload protection Low Pressure Switch The low pressure switch prevents compressor operation under low charge or in excessive loss of charge situations. This device is set to activate at refrigerant pressures of 35 psig when a 35 F low temperature detection thermostat is applied. An optional 7 psig pressure switch is available when using a 20 F temperature low temperature detection thermostat. High Pressure Switch For internal overload protection, Trane provides a high pressure switch. ...