Carrier RAV-SP180UT-UL Service Manual

Contents

Carrier RAV-SP180UT-UL Service Manual Manual pdf 27 page image

– 27 –6. REFRIGERANT R410AThis air conditioner adopts the new refrigerant HFC(R410A) which does not damage the ozone layer.The working pressure of the new refrigerant R410Ais 1.6 times higher than conventional refrigerant(R22). The refrigerating oil is also changed inaccordance with change of refrigerant, so be carefulthat water, dust, and existing refrigerant orrefrigerating oil are not entered in the refrigerantcycle of the air conditioner using the new refrigerantduring installation work or servicing time.The next section describes the precautions for airconditioner using the new refrigerant.Conforming to contents of the next section togetherwith the general cautions included in this manual,perform the correct and safe work.6-1. Safety During Installation/ServicingAs R410A’s pressure is about 1.6 times higher thanthat of R22, improper installation/servicing maycause a serious trouble. By using tools andmaterials exclusive for R410A, it is necessary tocarry out installation/servicing safely while takingthe following precautions into consideration.1. Never use refrigerant other than R410A in an airconditioner which is designed to operate withR410A.If other refrigerant than R410A is mixed,pressure in the refrigeration cycle becomesabnormally high, and it may cause personalinjury, etc. by a rupture.2. Confirm the used refrigerant name, and usetools and materials exclusive for the refrigerantR410A.The refrigerant name R410A is indicated on thevisible place of the outdoor unit of the airconditioner using R410A as refrigerant.To prevent mischarging, the diameter of theservice port differs from that of R22.3. If a refrigeration gas leakage occurs duringinstallation/servicing, be sure to ventilate fully.If the refrigerant gas comes into contact with fire,a poisonous gas may occur.4. When installing or removing an air conditioner,do not allow air or moisture to remain in therefrigeration cycle.Otherwise, pressure in the refrigeration cyclemay become abnormally high so that a ruptureor personal injury may be caused.5. After completion of installation work, check tomake sure that there is no refrigeration gasleakage.If the refrigerant gas leaks into the room, cominginto contact with fire in the fan-driven heater,space heater, etc., a poisonous gas may occur.6. When an air conditioning system charged with alarge volume of refrigerant is installed in a smallroom, it is necessary to exercise care so that,even when refrigerant leaks, its concentrationdoes not exceed the marginal level.If the refrigerant gas leakage occurs and itsconcentration exceeds the marginal level, anoxygen starvation accident may result.7. Be sure to carry out installation or removalaccording to the installation manual.Improper installation may cause refrigerationtrouble, water leakage, electric shock, fire, etc.8. Unauthorized modifications to the air conditionermay be dangerous. If a breakdown occursplease call a qualified air conditioner technicianor electrician.Improper repair may result in water leakage,electric shock and fire, etc.6-2. Refrigerant Piping Installation6-2-1. Piping Materials and Joints UsedFor the refrigerant piping installation, copper pipesand joints are mainly used.Copper pipes and joints suitable for the refrigerantmust be chosen and installed.Furthermore, it is necessary to use clean copperpipes and joints whose interior surfaces are lessaffected by contaminants.1. Copper PipesIt is necessary to use seamless copper pipeswhich are made of either copper or copper alloyand it is desirable that the amount of residual oilis less than 0.0001 lbs / 32’ 10” (40 mg/10 m).Do not use copper pipes having a collapsed,deformed or discolored portion (especially onthe interior surface).Otherwise, the expansion valve or capillary tubemay become blocked with contaminants.As an air conditioner using R410A incurs pres-sure higher than when using R22, it is necessaryto choose adequate materials.Thicknesses of copper pipes used with R410Aare as shown in Table 6-2-1. Never use copperpipes thinner than 0.8mm even when it is avail-able on the market.