Carrier 61WG 020 Installation, Operation And Maintenance Instructions

Contents

46High-pressure switch High-pressure sensorThe high-pressure sensor is however equipped with aSchrader valve. It is specific to these units and must not bereplaced with one from other Carrier units.30WGA units are equipped with an automatically reset safetypressure switch on the discharge line. The pressure switch isspecific for the 30WGA unit. Do not exchange it with otherunits including the 61WG/30WG units.17.6 - High-pressure switch and high-pressure sensor61WG/30WG units are equipped with an automatically resetsafety pressure switch on the liquid line. Refer to the controlsmanual for the alarm acknowledgements.It is strictly forbidden to modify the unit refrigerant circuit.The pressure switch is specific to the 61WG/30WG units - donot interchange it with other units. The pressure switch tapdoes not include a Schrader valve.High-pressure switchHigh-pressure sensor17.7 - High and low-pressure side safety valvesThe units are equipped with safety valves in accordance withthe European directive 97/23/CE. These safety valves arecalibrated and sized in accordance with the original high andlow-pressure side equipment.Only 61WG/30WG units include high and low-pressure sidesafety valves. 30WGA units are only equipped with a low-pressure side safety valve. The installer must determine whichaccessories (safety valves, fuses etc.) are required to ensurethat the completed high-pressure circuit complies with theapplicable regulations and standards.17.8 - Moisture indicatorLocated in the liquid line, permits control of the unit charge,as well as the presence of moisture in the circuit. Bubbles inthe sight glass indicate an insufficient charge or the presenceof non-condensibles. Regarding 30WGA units, if the indicatorpaper in the sight glass is yellow during the delivery, it is nota non-conformity. It is necessary to verify if the indicatorpaper in the sight glass is yellow after the vaccum.17.9 - Filter drier in the refrigerant circuitThe filter keeps the circuit clean and moisture-free. Themoisture indicator shows when it is necessary to change thefilter cartridges. A temperature difference between the filterdrier inlet and outlet indicates a contamination of thecartridges.30WGA are equipped as standard with a filter drier thatneeds to be soldered to the liquid line. It must be solderedas close as possible to the 30WGA unit, upstream of thesolenoid valve and as soon as possible after the circuit hasbeen exposed to the atmosphere while connecting the air-cooled condenser.Filter drier position