Carrier 48EZ(N)-A Installation Instructions Manual

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Contents

36C99097Fig. 24 -- Refrigerant Circuit2. Disconnect leads on switch.3. Apply ohm meter leads across switch. You should havecontinuity on a good switch.NOTE: Because these switches are attached to refrigerationsystem under pressure, it is not advisable to remove this device fortroubleshooting unless you are reasonably certain that a problemexists. If switch must be removed, remove and recover all systemcharge so that pressure gauges read 0 psi. Never open systemwithout breaking vacuum with dry nitrogen.High--Pressure SwitchThe high--pressure switch is located in the discharge line andprotects against excessive condenser coil pressure. It opens at 650psig.High pressure may be caused by a dirty outdoor coil, failed fanmotor, or outdoor air recirculation. To check switch:1. Turn off all power to unit.2. Disconnect leads on switch.3. Apply ohm meter leads across switch. You should havecontinuity on a good switch.Copeland Scroll Compressor (Puron Refrigerant)The compressor used in this product is specifically designed tooperate with Puron (R--410A) refrigerant and cannot beinterchanged.The compressor is an electrical (as well as mechanical) device.Exercise extreme caution when working near compressors. Powershould be shut off, if possible, for most troubleshooting techniques.Refrigerants present additional safety hazards.EXPLOSION HAZARDFailure to follow this warning could result in personal injuryor death and/or property damage.Wear safety glasses and gloves when handling refrigerants.Keep torches and other ignition sources away fromrefrigerants and oils.! WARNINGThe scroll compressor pumps refrigerant throughout the system bythe interaction of a stationary and an orbiting scroll. The scrollcompressor has no dynamic suction or discharge valves, and it ismore tolerant of stresses caused by debris, liquid slugging, andflooded starts. The compressor is equipped with an internalpressure relief port. The pressure relief port is a safety device,designed to protect against extreme high pressure. The relief porthas an operating range between 550 and 625 psig differentialpressure.48EZ -- A