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COMMERCIAL CONDENSING UNITS TECHNICAL MANUAL V3 FUSION & FUSION SCROLL A2L Commercial Condensing Units Medium Temperature Applications ISSUE: 01.03.2024...
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IMPORTANT! READ BEFORE PROCEEDING! GENERAL SAFETY GUIDELINES This guideline is intended for users to ensure safe installation, operation, and maintenance of J & E Hall Fusion and Fusion Scroll A2L condensing units. This guideline is not intended to replace the system expertise available from the system manufacturers. This equipment is a relatively complicated apparatus and is designed to use with A2L refrigerant which is mildly flammable.
JEHS: J & E Hall International Scroll Product Features J & E Hall V3 Fusion and Fusion Scroll A2L condensing unit adopt fix speed compressor in a flexible plug and play package, for medium refrigeration application. Standard features for all medium temperature model: •...
Application Guidelines During Installation and subsequent maintenance It should ensure that the refrigeration system • Only certified and qualified personnel who are familiar which adopts this condensing unit, wherever with local codes, regulations, and are experienced in possible to integrate pump down features. handling mildly flammable (A2L) refrigerant system This is to avoid liquid compression which equipment...
• All the models are suitable for both ground and wall • The units are not designed to operate with any mounting on brackets. restrictions such as heavy snowfall around them. Special attention should be given if unit Additional measures (such as shielding of the units) shall installed near to the sea as this can reduce be implemented as required.
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• Figure 5: Piping Layout for Outdoor Above In vertical pipework, the use of a U-trap and double suction risers are often required. These suction risers must Indoor always be fitted with a U-trap at the bottom and a P- trap at the top and never be higher than 4m unless a second U-trap system is fitted.
• Evacuate the system until vacuum is below 250 microns Pressure Testing (0.25 torr). • Never use oxygen, dry air, or acetylene Note: A triple evacuation procedure is recommended for for pressure testing systems as these may all new systems or where moisture is suspected. form an inflammable mixture.
• 3phase scroll compressor: live wires need correctly Risk Assessment terminated at motor rated circuit breaker for the compressor to rotate in correct direction (compression). It is important to ensure that sufficient free space is allowed • The unit is equipped with a motor circuit breaker with around the indoor evaporator to ensure that the flammable thermal overload and magnetic trip short circuit mixture is not created during the event of refrigerant...
Scroll Compressor Operation Commissioning Scroll compressor motors are designed to run only in one To gain access to the electrical box, turn the motor rated direction. This is not an issue with single phase compressors as circuit breaker on the side of the unit to the OFF position and they will always run in the correct direction.
When HP switch cut out mode is changed Crankcase Heaters from Manual to Auto operation, the fitting of an ART (anti-recycle timer) is recommended Crankcase heater should remain energized during the to protect the compressor. compressor off cycles. The initial start in the field is a very critical period for any new compressor because all load- bearing surfaces are new and require a short break-in Table 10: Dual Pressure Switch Manufacturer...
Discharge Thermostat Service and Maintenance (Applicable to JEHSA-0200-B2-M-3; JEHSA-0300-B2-M-3) Disconnect the mains electrical supply Only scroll models specified above are equipped with before servicing or opening the unit discharge thermostat with specification (cut out = 125±4⁰C, cut in = 95±5⁰C). The thermostat is connected in series to dual pressure switches, to disconnect all three phases at The condensing units are designed to give long life operation contactor in case of overtemperature.
5. Controls F-Gas Information • Check settings and operation of pressure switches. • Check overload setting. • The models of equipment covered in this Technical Manual Check fan speed control setting and operation. rely on fluorinated greenhouse gases for their functioning. •...
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Table 16: Trouble Shooting FAULT POSSIBLE CAUSE CHECK SOLUTION COMPRESSOR Power supply Phase(s) and neutral present? Check/rectify Voltage within tolerance? Check/rectify Is isolator switched on? If not - switch on Compressor contactor not If yes - coil faulty. Replace pulled in (where fitted) contactor/coil Is there correct voltage to contactor coil?
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FAULT POSSIBLE CAUSE CHECK SOLUTION Refrigerant overcharge Check and rectify Non-condensable in system Reclaim refrigerant, evacuate & recharge Internal wear / damage Noise is always present even if all Replace compressor operating conditions are OK? System load too high Are suction and discharge Reduce load at evaporator pressures high? High discharge pressure...
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FAULT POSSIBLE CAUSE CHECK SOLUTION Replace piping as required Damage to piping Head pressure too Clean condenser coil Condenser coil dirty Visual check of coil condition high System overcharged with Reclaim refrigerant/recharge Is head pressure high but liquid refrigerant correctly line cool to touch? See above Condenser fan not running...
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