Carrier 40VMM007A 3 Series Installation And Maintenance Instructions Manual

13Step 4 — Connect PipingCONDENSATE PIPING — The unit is supplied with a 1-1/4inch OD drain connection to connect copper or PVC drainpiping. See Fig. 19 below. Maximum pump lift is 27-1/2 inches.Fig. 19 —Condensate Drain ConnectionFollow these recommendations when installing condensatepiping:• The highest point in the condensate piping should be asclose to the unit as possible. See Fig. 20.• Condensate piping should slope downward in thedirection of condensate flow with a minimum gradient of1 inch per 100 inches. See Fig. 21.Fig. 20 —Condensate Piping• When multiple units are connected to a commoncondensate drain, ensure that the drain is large enough toaccommodate the volume of condensate from all units. Itis also recommended to have an air vent in thecondensate piping to prevent air lock.• Condensate piping must not be installed where it may beexposed to freezing temperatures.NOTE: CN18 can be disconnected to stop the pump. Thecondensate switch is CN5, which can be used for gravity drainprotection. See Fig. 22 and 23.REFRIGERANT PIPINGWhen connecting refrigerant piping from an indoor unit to anoutdoor unit, follow these guidelines:• Check maximum height drop and length of refrigerantpiping between the indoor and outdoor units. To ensurethe drop and length are acceptable, refer to therefrigerant piping allowable limits in the outdoor unitinstallation manual.• The number of bends in the refrigeration piping must beless than 15.• Refrigerant piping connection between indoor andoutdoor units should be performed once the units aresecured at their respective installation locations.• The refrigeration piping starts at the indoor unit and endsat the outdoor unit or MDC (Multiport DistributionController) for Heat Recovery systems.• The refrigerant piping should be dry and free of dust andother impurities.• The bending angle of the refrigerant pipe should notexceed 90° and the bending radius should be as large aspossible to prevent any breakage in piping.• Use proper cutting and flaring tools to avoid leakage.• Use a torque wrench for flare nuts. Refer to Table 3 forflare nut torque recommendations.Table 3 — Flare Nut Torque Recommendations• Before insulating the suction and liquid refrigerationpipes, perform pressure and leak tests. For details, seethe outdoor unit installation manual. Insulating bothsuction and liquid refrigerant pipes is mandatory.• Vacuuming and charging of the system should be carriedout as described in the outdoor unit installation manual.INSULATIONINDOORUNITCONDENSATE HOSE CLAMPLINE STUBFLEXIBLE DRAINCONNECTOR PVC DRAINPIPESUSPENSION RODSSTRUCTURAL CEILING8 in.Max 27-1/2 in.3 ft.SUPPORTSTRAPSDRAIN LINEFig. 21 — Using a Main Drain to Serve Multiple Indoor Units with Internal Condensate PumpsIndoor Unit2~3-15/16 in.7-7/8 in. 7-7/8 in. 7-7/8 in.2~3-15/16 in.2~3-15/16 in.MAIN DRAIN(Sloped at 1/50 ~ 1/100)INDIVIDUAL DRAIN OUTLET FROM EACH INDOOR UNIT(Must be connected to internal pump and must be routed tomain drain as shown.)Max 27-1/2 in.Max 27-1/2 in.Indoor Unit Indoor UnitMax 27-1/2 in.CAUTIONWhen connecting from an indoor unit to an outdoor unit,the isolation valve at the outdoor unit should be in theclosed position throughout the refrigerant piping process.Failure to follow this procedure may result in equipmentdamage.OUTSIDE DIAMETER (IN.) RECOMMENDED TORQUE(FT-LB)1 /4 153 /8 261 /2 415 /8 48