The Marstair CX(E) and CKC series are split system cellar coolers designed for maintaining optimal temperatures in cellars. These units utilize R407C refrigerant and are available in various cooling capacities, ranging from 2.8 to 6.8 kW, making them suitable for different cellar sizes and cooling requirements. The CX(E) units are indoor units, while the CKC units are outdoor units, forming a complete system when matched together.
Function Description
The primary function of the Marstair cellar cooler system is to provide cooling and, with optional heaters, heating within a cellar environment. The indoor CX(E) unit circulates air within the cellar, removing heat and maintaining a set temperature. The outdoor CKC unit dissipates the heat removed from the cellar to the outside atmosphere. The system is controlled by either an electromechanical or electronic control unit, depending on the CX(E) model, which manages the cooling cycle and can incorporate features like a de-ice thermostat for evaporator coil management.
Important Technical Specifications
- Refrigerant: R407C.
- Cooling Capacity: Ranges from 2.8 kW to 6.8 kW (Total), with sensible cooling from 1.79 kW to 4.30 kW, depending on the model and ambient conditions.
- Temperature Control: Factory set at 12°C, with a minimum set temperature of 8°C for standard systems and 4°C for low-temperature match systems. The controller should not be set below 4°C.
- Electrical Supply: Available in 1 Phase 230V 50Hz and 3 Phase 400V 50Hz configurations.
- Input Power (Cooling): Ranges from 1.3 kW to 3.2 kW for CX(E) units.
- Full Load Amps (Cooling): Ranges from 5.7 Amps (3 Ph) to 12.3 Amps (1 Ph) for CX(E) units.
- System Max Starting Current: Ranges from 28 Amps to 78 Amps, depending on the model and phase.
- Optional Electric Heater: Available in 3kW, with corresponding electrical loads.
- Air Flow (Indoor Unit): Ranges from 0.58 m³/s to 0.66 m³/s.
- Air Flow (Outdoor Unit): 0.97 m³/s for all CKC models.
- Sound Power Levels (Indoor Unit): dB(A) levels range from 55 to 56, with NC levels from 48 to 50.
- Sound Power Levels (Outdoor Unit): dB(A) levels range from 49 to 50, with NC levels from 43 to 45.
- Dimensions (Indoor Unit CX(E)): Height 483mm, Width 845mm, Depth 320mm.
- Dimensions (Outdoor Unit CKC): Height ranges from 620mm to 720mm, Width from 900mm to 1000mm, Depth 310mm.
- Weight (Indoor Unit CX(E)): Ranges from 18 kg to 23 kg (unpacked).
- Weight (Outdoor Unit CKC): Ranges from 46 kg to 66 kg (unpacked).
- Pipework: Maximum equivalent pipe run of 20m with expansion device connected to the indoor unit (liquid line), or up to 80m with expansion line connected to the outdoor unit (CKC only), including a maximum lift of 7.5m (20m for expansion line).
- Pipe Sizes: Male flare connections ranging from 3/8" to 1/2" for liquid/expansion and 1/2" to 5/8" for suction.
- Restrictors: Indoor units are supplied with fitted restrictors, which may need to be changed based on the matched outdoor unit (e.g., CXE 40 with CKC 20 requires a 0.033" restrictor).
- Head Pressure Control: Factory set for R407C at 275-280 psig (18.9-19.6 barg).
Usage Features
- Split System Design: Allows for flexible installation with the indoor unit in the cellar and the outdoor unit placed externally, minimizing noise and heat within the conditioned space.
- Electronic Control (CXE models): Features a digital temperature display (standard on CXE) and a CAREL IR33 or Eliwell ICPlus 915 controller for precise temperature management.
- ON/OFF Switch: Illuminated switch on the indoor unit controls the fan motor. When off, the fan stops, but the switch remains illuminated, and the crankcase heater in the outdoor unit (if fitted) stays live.
- Temperature Setting: Users can adjust the SET temperature using the controller, with clear instructions for accessing and modifying setpoint values.
- De-ice Thermostat: Activates a de-ice cycle when ice builds up on the evaporator coil, ensuring efficient operation.
- Heating Option: With an optional electric heater, the unit can also provide heating to the cellar.
- Displaying Inputs: The controller allows for displaying various inputs (probes, digital inputs, setpoints) on the screen for diagnostic purposes.
Maintenance Features
- Installation Guidelines: Detailed instructions for mounting, including weight support requirements and minimum access clearances for maintenance.
- Pipework Installation: Comprehensive guidance on connecting suction and liquid/expansion lines, including equivalent straight lengths of pipe for various fittings and maximum permissible pipe runs.
- Refrigerant Charging: Instructions for evacuating the system and adding R407C refrigerant, with specific charges based on pipe length and type (liquid or expansion line). It is crucial to remove the head pressure control link wire after charging.
- Restrictor Management: Clear notes on when and how to change restrictors based on the indoor and outdoor unit combination to ensure optimal performance.
- Electrical Connections: Information on routing cables to the terminal block and the importance of using fuses compatible with the recommended system.
- Component Identification: Detailed diagrams and lists for both indoor and outdoor units, aiding in troubleshooting and part replacement.
- Safety Warnings: Emphasizes the importance of skilled personnel for installation and maintenance, and warns against quick ON/OFF cycling or rapid temperature changes to prevent system damage.
- Nitrogen Charge: Units are supplied with a small charge of dry nitrogen, which should be discharged safely as it is non-toxic and has no global warming potential.
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