Green

Water Source Heat Pump is flexible for installation in boiler/cooling tower applications as well as ground-source (geothermal) applications with underground water or sewage water and soil as the heat source . It use R41OA refrigerant and is enviromental friendly .

Total heat recovery

During cooling mode, the unit produce 7 t: chilled water for load side and also produces free domestic hot water with heat recovery.

Construction

The cabinet is constructed of G-60 galvanization steel.Cabinet insulation is 15 mm thick , 48 kg/m3 density, skin-coated fiberglass . The entirebottom panel is insulated with the same material to prevent condensation and reduce noise transmission

Four access panels for the compressor , pump and control box sections allow service to all major components . See Picture 1.

Refrigerant System

The refrigeration system for each circuit consists of a hermetic compressor , 3 braze-plate type water-to-refrigerant heat exchangers , thermal expansion valve , access valves , reversing valve and safety controls. The compressor is mounted on special designed mounting channel and neoprene isolators . This dual isolation ensures minimal noise transmission and quiet operation . Each refrigerant circuit has high and low side access valves for servicing.

Use stainless steel brazed-plate heat exchanger with high efficiency and anticorrosive characteristics .

Electrical and Control Box

The control box houses all the electrical components with its own access panel. Controls include a transformer ,printed-circuit board, compressor contactor, relays etc.

The control system completes with a microprocessor-based unit controller with the following features :

• Five operation modes: Cooling, heating, heat recovery, domestic hot water, heating with domestic hot water (with domestic hot water as priority)

• Water temperature Indication: The inlet and outlet water temperature are indicated on the thermostat.(load water , soruce water , domestic hot water)

• Pump connection: Pump can be linked to work .(the control systom can integrate three pump connections)

• Safety Lockout: Safety lockout prevents compressor operation if any of the safety switches trip: high pressure switch , low pressure switch , water flow switch . The unit can be reset from the wall thermostat or from the main unit disconnect.

• Low pressure switch bypass: Low pressure switch will bypass the low pressure input signal for 120 seconds each time the compressor starts , to eliminate nuisance trip and to allow the suction pressure to build up at startup .

• BMS communication: Use RS485 communication port to connect with BMS, see Picture 2

• Others: Antifreezing  protection; LCD error code display ; Timer-power-on/off etc .