Carrier 40MVC Installation Instructions Manual

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Carrier 40MVC Installation Instructions Manual Manual pdf 11 page image

11UNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.Never use the system compressor as a vacuum pump.CAUTION!Refrigerant tubes and indoor coil should be evacuated using therecommended deep vacuum method of 500 microns. The alternatetriple evacuation method may be used if the procedure outlinedbelow is followed. Always break a vacuum with dry nitrogen.SYSTEM VACUUM AND CHARGEUsing Vacuum Pump1. Completely tighten flare nuts A, B, C, D, connect manifoldgage charge hose to a charge port of the low side servicevalve. (See Fig. 18)2. Connect charge hose to vacuum pump.3. Fully open the low side of manifold gage. (See Fig. 19)4. Start vacuum pump5. Evacuate using either deep vacuum or triple evacuationmethod.6. After evacuation is complete, fully close the low side ofmanifold gage and stop operation of vacuum pump.7. The factory charge contained in the outdoor unit is good forup to 25 ft. (8 m) of line length. For refrigerant lines longerthan 25 ft (8 m), add 0.1 oz. per foot of extra piping up tothe maximum allowable length.8. Disconnect charge hose from charge connection of the lowside service valve.9. Fully open service valves B and A.10. Securely tighten caps of service valves.Outdoor Unit Indoor UnitRefrigerantService ValveLow SideHigh SideABCDA07360Fig. 18 --- Service ValveManifold Gage500 micronsLow side valve High side valveCharge hose Charge hoseVacuum pumpLow side valveA07361Fig. 19 --- ManifoldDeep Vacuum MethodThe deep vacuum method requires a vacuum pump capable ofpulling a vacuum of 500 microns and a vacuum gage capable ofaccurately measuring this vacuum depth. The deep vacuum methodis the most positive way of assuring a system is free of air andliquid water. (See Fig. 20)500MINUTES0 1 2 3 4 5 6 710001500LEAK INSYSTEMVACUUM TIGHTTOO WETTIGHTDRY SYSTEM2000MICRONS250030003500400045005000A95424Fig. 20 --- Deep Vacuum GraphTriple Evacuation MethodThe triple evacuation method should only be used when vacuumpump is only capable of pumping down to 28 in. of mercuryvacuum and system does not contain any liquid water.Refer to Fig. 21 and proceed as follows:1. Pump system down to 28 in. of mercury and allow pump tocontinue operating for an additional 15 minutes.2. Close service valves and shut off vacuum pump.3. Connect a nitrogen cylinder and regulator to system andopen until system pressure is 2 psig.4. Close service valve and allow system to stand for 1 hr. Dur-ing this time, dry nitrogen will be able to diffuse throughoutthe system absorbing moisture.5. Repeat this procedure as indicated in Fig. 21. System willthen be free of any contaminants and water vapor.CHECK FOR TIGHT, DRY SYSTEM(IF IT HOLDS DEEP VACUUM)EVACUATEBREAK VACUUM WITH DRY NITROGENWAITEVACUATERELEASE CHARGE INTO SYSTEMBREAK VACUUM WITH DRY NITROGENEVACUATEWAITA95425Fig. 21 --- Triple Evacuation MethodFinal Tubing CheckIMPORTANT: Check to be certain factory tubing on both indoorand outdoor unit has not shifted during shipment. Ensure tubes arenot rubbing against each other or any sheet metal. Pay closeattention to feeder tubes, making sure wire ties on feeder tubes aresecure and tight.38/40MVC, MVQ

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