Panasonic CU-3KS19NBU Technical & Service Manual

Also see for CU-3KS19NBU: Operating instructions Installation manual

Contents

Panasonic CU-3KS19NBU Technical & Service Manual Manual pdf 105 page image

194. Air PurgingAir and moisture remaining in the refrigerant system haveundesirable effects as indicated below. Therefore, theymust be purged completely. pressure in the system rises operating current rises cooling efficiency drops moisture in the air may freeze and block capillary tubing water may lead to corrosion of parts in the refrigerantsystem Air Purging with a Vacuum Pump(for Test Run) In order to protect the earth’s environment, be sure to usea vacuum pump to perform the air purge.(Never perform an air purge by using the refrigerant gascylinder or other external gas, or by using the gas insidethe outdoor unit.)Fig. 20CAUTIONIn order to prevent charging errorswith the air conditioner that usesR410A, the screw diameter at theservice valve charging port hasbeen changed. When recharging orperforming other servicing, use thespecial charging hose and manifoldgauge.Servicevalve onwide tubesideServicevalve onnarrowtube sideABCDVacuumpumpVacuum pumpadapter(for preventingreverse flow)(special forR410A)High-pressure valveManifold gauge(special for R410A)Low-pressurevalveLeave thevalve open.OpenCharging hose(special for R410A)Hex wrenchWith push-pinHiLo3-7. Taping the Tubes(1) At this time, the 2 refrigerant tubes (and electrical wireif local codes permit) should be taped together witharmoring tape. The drain hose may also be includedand taped together as 1 bundle with the tubing.(2) Wrap the armoring tape from the bottom of the outdoorunit to the top of the tubing where it enters the wall. Asyou wrap the tubing, overlap half of each previous tapeturn. (Fig. 18)(3) Clamp the tubing bundle to wall, using 1 clamp approx.every 47" (120 cm).Do not wind the armoring tape too tightly, since this willdecrease the heat insulation effect. Also, be sure the con-densation drain hose splits away from the bundle and dripsclear of the unit and the tubing.3-8. Finishing the InstallationAfter finishing insulating and taping over the tubing, usesealing putty to seal off the hole in the wall to prevent rainand draft from entering. (Fig. 19)NOTEFig. 18ClampInsulated tubesApply putty hereTubingFig. 19CAUTIONAfter a tube has been insulated,never try to bend it into a narrowcurve, as this may cause the tubeto break or crack.