Sanyo 8.53E+13 installation instructions Air Purging

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05-423 KHS0971-1271 12/13/05 1:23 PM Page 19

6. Air Purging

Air and moisture remaining in the refrigerant system have undesirable effects as indicated below. Therefore, they must be purged completely.

●pressure in the system rises

●operating current rises

●cooling (or heating) efficiency drops

●moisture in the air may freeze and block capillary tubing

●water may lead to corrosion of parts in the refrigerant system

■Air Purging with a Vacuum Pump (for Test Run)

(1)Check that each tube (both narrow and wide tubes) between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed. Note that both narrow and wide tube service valves on the outdoor unit are kept closed at this stage.

(2)Using an adjustable wrench or box wrench, remove the valve caps from the service valve on both nar- row and wide tubes.

(3)Connect a vacuum pump and a manifold valve (with pressure gauges) to the service port on the wide tube service valve. (Fig. 57)

 

CAUTION

The service port on the wide tube

 

 

 

service valve uses a Schrader core

 

 

 

 

 

 

valve to access the refrigerant sys-

 

 

 

tem. The valve core is similar to

 

 

 

those used in automobile tires.

 

 

 

Therefore, be sure to use a vacuum

 

 

 

hose connector which has a push-

 

 

 

pin inside.

 

 

 

Be sure to use a manifold valve

 

CAUTION

 

 

for air purging. If it is not avail-

 

 

 

 

 

 

 

 

able, use a stop valve (field sup-

 

 

 

ply) for this purpose. The “Hi”

 

 

 

knob of the manifold valve must

 

 

 

always be kept closed.

(4)With the “Lo” knob of the manifold valve open, run the vacuum pump. The operation time for the vacu- um pump varies with tubing length and the capacity of the pump. The following table shows the amount of time for evacuation:

Table 7

Required time for evacuation when 100 liter/h vacuum pump is used

If tubing length is

If tubing length is

less than 33 ft. (10 m)

more than 33 ft. (10 m)

 

 

10 min. or more

15 min. or more

 

 

Indoor unit

Outdoor unit

Manifold valve (Exclusively for R410A)

Pressure

Lo

Hi

gauge

 

 

Charging hose (Exclusively for R410A)

Vacuum pump adapter (Exclusively for R410A)

(with reverse flow prevention)

Vacuum pump

Fig. 57

NOTE

To prevent other refrigerants from being mistakenly charged to units which use R410A, the size of the charge port on the service valve is different from the one for other refrigerant types. For servicing such as recharging, the specified charging hose, manifold and vacuum pump adapter (with reverse flow prevention) for R410A must be used.

NOTE

The required time in Table 7 is calculated based on the assumption that the ideal (or target) vacuum condition is around 10 mmHg abs.

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Contents Contents Installation Instructions…In Moist or Uneven Locations For safe installation and trouble-free operation, you must…In a Ceiling or Wall …In a RoomOptional Copper Tubing Kit Tools Required for Installation not suppliedAccessories Supplied with Unit Table GeneralFront View Installation Site SelectionAdditional Materials Required for Installation Indoor UnitSolid base must not cover Outdoor UnitHole of the bottom plate Make a Hole How to Install the Indoor UnitTrical wiring or conduits are Remove the Rear Panel from the UnitHole Dia Install the Rear Panel on the WallIf Wooden Wall If Block, Brick, Concrete or Similar Type WallHow to replace the grille Remove the Grille to Install the Indoor UnitShape the Indoor Side Tubing Wiring Instructions General precautions on wiringRecommended Wire Length and Diameter Wiring Instructions for Inter-unit Connections For Outdoor Unit For solid core wiring or F-cable How to connect wiring to the terminal For Indoor UnitFor stranded wiring Right-side tubing MountingDrain cap Switching drain hose and drain capLeft-side tubing Drain hoseUnit or operate it until all Do not supply power toTubing and wiring to the out To unmount indoor unitWiring Instructions for the Outdoor Unit How to Install the Outdoor UnitUse of the Flaring Method Flaring Procedure with a Flare ToolTo 0.5 mm Adjust so that the amount of tube Refrigerant TubingTube Dia Tightening Torque Connecting Tubing between Indoor and Outdoor UnitsFinishing the Installation Insulation of Refrigerant TubingAir Purging Hex wrench before Be sure to completely insertAttempting to turn the valve Operation lamp Timer lamp Quiet lamp ION lamp How to Test Run the Air ConditionerPump Down Basic Functions of the Service ValvesTo take out the remote control unit, pull it forward Remote Control Unit Installation PositionMounting on a Wall Address Setting of the Remote Control Unit Address Switch

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