Simultaneous Heating & Cooling Chiller for Solar Applications

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Simultaneous Heating & Cooling (SHC) Chiller for Solar Applications. Primary DC 380V / Secondary AC 208/230-1-50/60

1-Equipment:

A. General:

  1. Unit is factory assembled and tested.
  2. Assembled on heavy gauge steel mounting/lifting rails.
  3. Contained within the unit cabinet shall be all factory wiring, piping, controls, refrigerant charge (R410a), POE oil and special accessories required prior to start up.
  4. Brass body strainers with 20 mesh screen and blow down shall be supplied in cabinet as a field installable accessory.

B. Unit Cabinet:

  1. Composed of heavy gauge galvanized steel casing with a baked polyester powder coat ing.
  2. Capable of withstanding 500-hour salt spray test in accordance with the ASTM (U.S.A.) standard.

C. Condenser Fans:

  1. Five blade glass reinforced polypropylene (PP) petals mounted on a cast aluminum hub construction and shall be dynamically balanced and corrosion resistant.
  2. Discharge air is vertical.
  3. Motors and blades shall be protected by coated steel wire safety guards.

D. Fan Motors:

  1. Condenser fan motor is variable speed, brushless DC type.
  2. Condenser fan motors is Totally Enclosed Air Over (TEAO), use Class B insulation, and permanently lubricated ball and/or sleeve bearings.
  3. Condenser fan motors is internally overload protected with automatic reset.

E. Compressor:

  1. Unit contains one Emerson/Copeland variable speed DC scroll compressor.
  2. Direct current DC, 900-7,200 rpm (15-120Hz).
  3. Compressor motor shall be suction gas cooled.
  4. External motor protection.
  5. Externally protected by low and high pressure cutout devices and discharge temperature sensing thermistor.
  6. Individual vibration isolators.
  7. Compressor compartment is internally insulated using noise reducing elastomeric foam insulation.

F. Solar Inverter:

  1. Unit contains one Pika 7601C Power Core Inverter matched with S2501 PV links at solar panels.

G. Pump:

  1. Unit is capable of incorporating a field installed chilled liquid solution pump internally. (Space restricted)
  2. Unit has chilled liquid solution piping to the exterior of the cabinet.

H. Evaporator (Cooling):

  1. Evaporator has one refrigerant circuit and one liquid solution circuit.
  2. Evaporator rated for a refrigerant side working pressure up to 550 psig.
  3. Evaporator rated for a water side working pressure up to 150 psig.
  4. Single pass, ANSI type 316 stainless steel, brazed plate construction with copper/nickel brazing material.

I. Condenser (Heating):

  1. Condenser has one refrigerant circuit and one liquid solution circuit.
  2. Condenser rated for a refrigerant side working pressure up to 550 psig.
  3. Condenser rated for a water side working pressure up to 150 psig.
  4. Single pass, ANSI type 316 stainless steel, brazed plate construction with copper/nickel brazing material.

J. Evaporator/Condenser (Cooling/Heating):

  1. Condenser coil is air-cooled with integral sub-cooler.
  2. Constructed of rifled copper tubing mechanically bonded to aluminum fins.
  3. Cleaned and dehydrated.
  4. Factory leak tested to 650 psig.

K. Refrigerant Circuits:

  1. Each circuit contains liquid line strainers, electronic expansion valves, solenoid valve, check valve, refrigerant charge of R410a, and POE compressor oil.

2-Controls and Safeties

  1. Chiller is completely factory wired and tested.
  2. Temperature control shall be based on leaving liquid solution temperatures.
    1. 1. Temperature accuracy shall be + - 1°F
  3. Controls is capable of variable speed control.
  4. Controls includes the following components:
    1. 24vac transformers to serve all controllers, relays, and control components.
    2. Microprocessor based liquid solution temperature controller.
    3. Leaving water temperature thermistors.
  5. Chilled liquid solution flow switches.
  6. All functions shall be addressable, logic, code, and algorithm controlled.
  7. Ethernet port supplied for communication and monitoring.
  8. Compatible with Building Automation Systems (BAS) using BACnet protocol.
  9. Unit is equipped with all necessary components in conjunction with the control system to provide the following protection:
    1. Low refrigerant pressure.
    2. High refrigerant pressure.
    3. Water side cold & hot flow.

3-Operating Characteristics

3.1-Temperatures

  1. Unit is capable of starting and running at outdoor temperatures from 0°F to 120°F.
  2. Unit is capable of initial startup in cooling mode with a maximum 80°F entering fluid temperature and ambient not above 95° F.
  3. Maximum sustained entering fluid solution temperature to the evaporator shall not exceed 70°F in cooling mode.
  4. Minimum 10% glycol solution is required in all applications. For outdoor temperatures below 32°F, reference the propylene glycol manufacture’s data table of field installed polypropylene glycol solution concentrations.

3.2-Electrical Requirements

  1. Primary DC electrical power supply shall enter the unit at a single location.
  2. Secondary AC electrical power supply if used, shall enter the unit at a single location.
  3. Electrical power supply shall be rated to withstand 90°C operating ambient temperature.

PDFTechnical Documents