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AD-183A
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
AD-243A
SERVICE MANUAL

2Room Air Conditioner
Air Conditioner Service Manual
TABLE OF CONTENTS
Safety Precautions..........................................................................................................................................3
Dimensions .....................................................................................................................................................5
Symbols Used in this Manual.....................................................................................................................5
Outside Dimensions...................................................................................................................................5
Product Specifications ..................................................................................................................................6
Installation .......................................................................................................................................................7
Select the Best Location ...........................................................................................................................7
Installation Check.......................................................................................................................................7
How to Secure the Drain Pipe....................................................................................................................7
Window Requirements...............................................................................................................................8
Installation Kits Contents............................................................................................................................8
Suggested Tool Requirements...................................................................................................................9
Cabinet Installation...................................................................................................................................10
Operation ......................................................................................................................................................12
Features...................................................................................................................................................12
Control Locations Function of Controls....................................................................................................12
Disassembly ..................................................................................................................................................14
Mechanical Parts......................................................................................................................................14
Air Handling Parts ....................................................................................................................................15
Electrical Parts .........................................................................................................................................16
Refrigerating Cycle...................................................................................................................................18
Schematic Diagram.......................................................................................................................................21
Electronic Control Device.........................................................................................................................21
Wiring Diagram.........................................................................................................................................22
Components Lation..................................................................................................................................23
Troubleshooting Guide .................................................................................................................................24
Piping System ..........................................................................................................................................24
Troubleshooting Guide .............................................................................................................................25
Room Air Conditioner Voltage Limits........................................................................................................31

Service Manual 3
Safety Precautions
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
■Meanings of symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to property only.
WARNING
■Installation
Do not use damaged power cord plugs, or a
loose socket.
• There is risk of fire or electric shock.
Always use the power plug and socket with
the ground terminal.
• There is risk of electric shock.
Be sure not to do.
Be sure to follow the instruction.

4Room Air Conditioner
Safety Precautions
Do not modify or extend the power cord.
• There is risk or fire or electric shock.
Do not install, remove, or re-install the unit by
yourself.
• There is risk of fire, electric shock, explosion, or injury.
Be cautious when unpacking and installing
the product.
• Sharp edges could cause injury. Be especially careful
of the case edges and the fins on the condenser and
evaporator.
Do not store or use flammable gas or com-
bustibles near the air conditioner.
• There is risk of fire or failure of product.
Be sure the installation area does not deterio-
rate with age.
• If the base collapses, the air conditioner could fall with
it, causing property damage, product failure, and per-
sonal injury.
Gasolin
Sharp edges

Dimensions
Dimensions
770 660
824
W mm(inch) 660(26") 660(26")
H mm(inch) 428(16 27/32") 428(16 27/32")
D mm(inch) 770(305/16")
770(30
5
/ 16 ")
Model
Dimension
18K Btu 24K Btu
Outside Dimensions
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the
air conditioner.
This symbol indicates special notes.
NOTICE
Symbols Used in this Manual
Service Manual 5

6Room Air Conditioner
Specfications
Product Specifications
POWER SUPPLY
COOLING CAPACITY
INPUT
E.E.R
REFRIGERANT (R-22) CHARGE(g)
OPERATING INDOOR(°C)
TEMPERATURE OUTDOOR(°C)
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN MOTOR
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
CONSTRUCTION
PROTECTOR COMPRESSOR
FAN MOTOR
POWER CORD
DRAIN SYSTEM
NET WEIGHT (lbs/kg)
OUTSIDE DIMENSION (inch)
(W x H x D) (mm)
MODELS
ITEMS RAD-183A
Table -1
1Ø, 208/230V, 60Hz
17,500/18,000
1,800/1,850
9.0/8.3
720g(25.4oz)
27(DB),19(WB)
35(DB),24(WB)
2 ROW 15 STACKS
LOUVERED-FIN TYP
2 ROW 19 STACKS,LOUVERED-FIN TYPE
TURBO
PROPELLER TYPE FAN WITH SLINGER-RING
3/3
6 POLES
WIRELESS REMOCN
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
SLIDE IN-OUT CHASSIS
INTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3 WIRE WITH GROUNDING
CORD-CONNECTED TYPE(ATTATCHMENT PLUG:OPTION)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
137/62
26 x 16 27/32 x 30 5/16
660 x 428 x770
L-BENDING TYPE

7Room Air Conditioner
Specfications
Product Specifications
POWER SUPPLY
COOLING CAPACITY
INPUT
E.E.R
REFRIGERANT (R-22) CHARGE(g)
OPERATING INDOOR(°C)
TEMPERATURE OUTDOOR(°C)
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN MOTOR
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
CONSTRUCTION
PROTECTOR COMPRESSOR
FAN MOTOR
POWER CORD
DRAIN SYSTEM
NET WEIGHT (lbs/kg)
OUTSIDE DIMENSION (inch)
(W x H x D) (mm)
MODELS
ITEMSRAD-243A
Table -1
1Ø, 208/230V, 60Hz
23,500/23,000
2,760/1,850
8.5/8.5
830g(29.3oz)
27(DB),19(WB)
35(DB),24(WB)
3 ROW 15 STACKS
LOUVERED-FIN TYP
2 ROW 19 STACKS,LOUVERED-FIN TYPE
TURBO
PROPELLER TYPE FAN WITH SLINGER-RING
3/3
6 POLES
WIRELESS REMOCN
THERMISTOR
VERTICAL LOUVER(RIGHT & LEFT)
HORIZONTAL LOUVER(UP & DOWN)
SLIDE IN-OUT CHASSIS
INTERNAL OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
3 WIRE WITH GROUNDING
CORD-CONNECTED TYPE(ATTATCHMENT PLUG:OPTION)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
146/66
26 x 16 27/32 x 30 5/16
660 x 428 x770
L-BENDING TYPE

Service Manual 8
Installation
Installation
Select the Best Location
Installation Check
How to Secure the Drain Pipe
1.To prevent vibration and noise, make sure the unit is
installed securely and firmly.
2.Install the unit where the sunlight does not shine directly
on the unit.
3.The outside of the cabinet must extend outward for at
least 30cm and there should be no obstacles, such as a
fence or wall, within 50cm from the back of the cabinet
because it will prevent heat radiation of the condenser.
Restriction of outside air will greatly reduce the cooling
efficiency of the air conditioner.
CAUTION: All side louvers of the cabinet
must remain exposed to the outside of
the structure.
4.Install the unit a little slanted so the back is slightly lower
than the front (about 10~15mm). This will help force con-
densed water to the outside.
5.Install the unit from the bottom about 75~150cm above
the floor level.
The setting conditions must be checked prior to initial starting.
The following items are especially important checking points when the installation is finished.
1. Grounding wire (Green or Green and Yellow) is provided in the power cord. The green wire must be grounded.
2. Connect to a single-outlet 15A circuit.
(or 20A circuit for Electric Heater Model)
3. To avoid vibration or noise, make sure the air conditioner is installed securely.
4 Avoid placing furniture or draperies in front of the air inlet and outlet.
In humid weather, excess water may cause the BASE PAN to overflow. To drain
the water, remove the DRAIN CAP and secure the DRAIN PIPE to the rear hole of
the BASE PAN. Press the drain pipe into the hole by pushing down and away from
the fins to avoid injury.
Optional
1. Install the drain pan over the corner of the cabinet where you removed the
plug with 4 (or 2) screws.
2. Connect the drain hose to the outlet located at the bottom of the drain pan.
You can purchase the drain hose or tubing locally to satisfy your particular
needs. (Drain hose is not supplied).
3. Select the most appropriate connection from among the following figures (by
considering the hole of the unit) to fit drain pan to your own unit.
AWNING
COOLED AIR HEAT
RADIATION
75~15cm
ABOUT 10~15mm
Over 50cm
FENCE
Drain pipe
Drain cap
Fig. 4
Fig. 3
Fig. 2
DRAIN
PAN DRAIN HOSE
Fig. 1
CABINET SCREW
Figure 1

9Room Air Conditioner
Installation
Window Requirements
Installation Kits Contents
All supporting parts should be secured to firm
wood, masonry, or metal.
1. This unit is designed for installation in standard dou-
ble hung windows with actual opening widths from
26" to 41".
The top and bottom window sashes must open suffi-
ciently to allow a clear vertical opening of 18" from
the bottom of the upper sash to the window stool.
2. The stool offset (height between the stool and sill)
must be less than 1 1/4".
NOTICE
Foam-PE
(Adhesive-Backed)
Foam-PE
(Adhesive-Backed)
Type C (5) Type D (2)
Type A (14)
Carriage Bolt (2) Lock Nut (4)
Type B (7)
Foam strip
(Plain-Back)
Right frame
curtain
Window locking
bracket
Left frame
curtain
Frame guide(2)
Sill
bracket (2)
26" to 41"
18" min Offset
Less
than 1 1/4"
Sill
Exterior
Interior wall
26" min.
(Without frame curtain)
Stool
Support bracket(2)
Drain joint pipe

Service Manual 10
Installation
Suggested Tool Requirements
PREPARATION OF CHASSIS
1. Remove the screws which fasten the cabinet at both
sides and at the back.
2. Slide the unit out from the cabinet by gripping the
base pan handle and pulling forward while bracing
the cabinet.
3. Cut the window sash seal to the proper length. Peel
off the backing and attach the Foam-PE to the
underside of the window sash.
4. Remove the backing from Foam-PE with 3 holes
and attach it to the bottom of the Top retainer bar.
5. Attach the Top retainer bar on the top of the cabinet
with 3 screws (Type A).
6. Insert the Frame guides into the bottom of the cabi-
net.
7. Insert the Frame Curtain into the Top retainer bar
and Frame guides.
8. Fasten the curtains to the unit with 10 screws
(Type A) at both sides.
Foam-PE
Top retainer bar
Top retainer bar
Foam-PE
Screw
(Type A)
Screw(Type A)
Frame guide
Shipping screws
Figure 2
Figure 3
Figure 4
Figure 5

11 Room Air Conditioner
Installation
Cabinet Installation
1. Open the window. Mark a line on the center of the
window stool between the side window stop mold-
ings.
Loosely attach the sill bracket to the support bracket
using the carriage bolt and the lock nut.
2. Attach the sill bracket to the window sill using the
screws (Type B).
Carefully place the cabinet on the window stool and
align the center mark on the bottom front with the
center line marked window stool.
3. Using the M-screw and the lock nut, attach the sup-
port bracket to the cabinet track hole. Use the first
track hole after the sill bracket on the outer edge of
the window sill. Tighten the carriage bolt and the lock
nut. Be sure the cabinet slants outward.
CAUTION: Do not drill a hole in the
bottom pan. The unit is designed to
operate with approximately 1/2" of
water in bottom pan.
4. Pull the bottom window sash down behind the Top
retainer bar until they meet.
1. Do not pull the window sash down so tightly that the
movement of Frame curtain is restricted. Attach the
cabinet to the window stool by driving the screws
(Type B) through the cabinet into window stool.
2. The cabinet should be installed with a very slight tilt
downward toward the outside.
NOTICE
Support
Bracket
Lock nut
Sill
Bracket
Carriage
Bolt
(M-Screw)
Front angle Window stool
Window sash Top retainer bar
Cabinet
Foam-PE
Frame curtain
Screw(Type B)
Front Angle
Sash track
Foam-PE
Cabinet
Track hole
Support
Bracket
Carriage bolt
and lock nut
Machine screw(Type D)
and lock nut
Outer edge
of window
sill
Screw(Type B)
Sill bracket
Top
retainer
bar
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10

Service Manual 12
Installation
5. Pull each Frame curtain fully to each window sash
track, and pull the bottom window sash down behind
the Top retainer bar until it meets.
6. Attach each Frame curtain the window sash by using
screws (Type C.) (See Fig. 11)
7. Slide the unit into the cabinet.(See Fig. 12)
CAUTION: For security purpose, rein-
stall screws(Type A) at cabinet's
sides.
8. Cut the Foam-strip to the proper length and insert
between the upper window sash and the lower win-
dow sash.(See Fig. 13)
9. Attach the Window locking bracket with a screw
(Type C.) (See Fig. 14)
10. Attach the front grille to the cabinet by inserting the
tabs on the grille into the tabs on the front of the
cabinet. Push the grille in until it snaps into
place.(See Fig.15)
11. Lift the inlet grille and secure it with a screw (Type
A) through the front grille.(See Fig. 15)
12. Window installation of room air conditioner is now
completed. See ELECTRICAL DATA for attaching
power cord to electrical outlet.
Power Cord
Screw (Type A)
Screw
Window locking
bracket
Foam-Strip
Screw(Type C)
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16

13 Room Air Conditioner
•Designed for COOLING ONLY.
•Powerful and whispering cooling.
•Slide-in and slide-out chassis for the simple instal-
lation and service.
•Side air-intake, side cooled-air discharge.
1. Cooling Only Model
• VENTILATION
The ventilation lever must be in the CLOSE position
in order to maintain the best cooling conditions.
When a fresh air is necessary in the room, set the
ventilation lever OPEN position.
The damper is opened and room air is exhausted.
Before using the ventilation feature,
make the lever, as shown. First, pull down
part to horizontal line with part .
• THERMOSTAT
Thermostat will automatically control the temperature
of the room. Select a higher number for a cooler tem-
perature in the room. The temperature is selected by
positioning the knob to the desired position.
The 5or 6position is a normal setting for average
conditions.
• OPERATION
OFF : Turns the air conditioner off.
MED FAN : Permits the medium fan speed operation
without cooling.
LOW FAN : Permits the low fan speed operation
without cooling.
HIGH COOL: Permits cooling with the high fan speed
operation.
MED COOL : Permits cooling with the medium fan
speed operation.
LOW COOL : Permits cooling with the low fan speed
operation.
• AUTO SWING
ON : Air swing is operated while OPERATION knob is
set to the COOL position.
OFF : Stops the operation of air swing.
•Built-in adjustable THERMOSTAT
•Washable one-touch filter
•Compact size
•Reliable and efficient rotary compressor
NOTICE
Operation
Operation
Features
Control Locations Function of Controls
CLOSE VENT OPEN
6
7
8
9
5
1
2
Off On
Med
Fan
Off
Low
Fan
High
Cool
Med
Cool
Low Cool
Auto Swing
3
4
Thermostat Operation

Service Manual 14
Operation
2. Cooling Only Model with Remote Control and Touch Type
POWER BUTTON
Operation starts, when this button is pressed and stops when you press the button again.
OPERATION MODE SELECTION BUTTON
Select Cooling, or Fan or Dehumid mode with button. (Dehumid mode is not to all models.)
ON/OFF TIMER BUTTON
Set the time of starting and stopping operation. The timer is set by 1 hour.
FAN SPEED SELECTOR
Select the fan speed in three steps.
- High [F3] ➔Low[F1] ➔Med[F2] ➔High[F3]... .
ROOM TEMPERATURE SETTING BUTTON
Control the room temperature within a range of 60°F to 86°F by 1°F.
ENERGY SAVER
(Available In some models)
The fan stops when the compressor stops cooling.
Approximately every 3 minutes the fan will turn on and check the room air to determine if cooling is needed.
AUTO SWING BUTTON
Control the horizontal air direcion by air swing system.
6
6
7
7
REMOTE CONTROL DISPLAY
Power
Temp
Fan Speed
Timer Mode
Energy
Saver Auto Swing
1
4
3
6
2
7
RAD-183A, RAD-243A
PRECAUTION: The Remote Control unit will not
function properly if bright light strikes the sensor window of the air conditioner or if
there are obstacles between the Remote Control unit and the air conditioner.
AUTO RESTART
In case the power comes on again after a power failure, the unit runs as previous setting operation.
RAD-183A
RAD-243A
5
8
1
6
45
3
2
7
8
1
6
45
3
2
7

15 Room Air Conditioner
Disassembly
Disassembly
Mechanical Parts
—Before the following disassembly, CONTROL BOX set to OFF and disconnect the power cord.
1. Front Grille
1. Open the lnlet grille upward .
2. Remove the screw that fastens the front grille.
3. Pull the front grille from the right side.
4. Remove the front grille.
5. Re-install the component by referring to the removal
procedure, above.(See Figure 17)
Mark " "of inlet grille means opening
direction.
2. Cabinet
1. After disassembling the FRONT GRILLE, remove the
2 screws that fasten the cabinet at both sides.
2. Remove the 2 screws that fasten the cabinet at back.
3. Pull the base pan forward. (See Figure 18)
4. Remove the cabinet.
5. Re-install the component by referring to the removal
procedure, above.
3. Control Box
1. Remove the front grille. (Refer to section 17)
2. Remove the cabinet. (Refer to section 18)
3. Remove the 2 screws that fasten the control box
cover.
4. Remove two housings that connect compressor wire
and motor wire in the control box.
5. Discharge the capacitor by placing a 20,000 ohm
resistor across the capacitor terminals.
6. Remove the 2 screws that fasten the control box.
7. Pull the control box forward completely.
8. Re-install the components by referring to the removal
procedure, above. (See Figure 19)
(Refer to the circuit diagram found on page 23 in this
manual and on the control box.)
NOTICE
Figure 17
Figure 18
Figure 19

Service Manual 16
Disassembly
Air Handling Parts
4. Cover (at the top)
1. Remove the front grille. (Refer to section 17)
2. Remove the cabinet. (Refer to section 18)
3. Remove 11 screws which fasten the brace and
covers.
4. Remove the covers and the brace. (See Fig. 20)
5. Re-install the components by referring to the
removal procedure, above.
5. Blower
1. Remove the cover. (Refer to section 20)
2. Remove the 3 screws which fasten the evaporator
at the left side and the top side.
3. Move the evaporator sideward carefully.
4. Remove the orifice from the air guide carefully.
5. Remove the clamp which secures the blower with
plier. (See Fig. 21)
6. Remove the blower with plier or your hand without
touching blades. (See Fig. 22)
7. Re-install the components by referring to the
removal procedure, above.
6. Fan
1. Remove the cabinet. (Refer to section 18)
2. Remove the brace and shroud cover.
(Refer to section 20)
3. Remove the 5 screws which fasten the condenser.
4. Move the condenser sideways carefully.
5. Remove the clamp which secures the fan.
6. Remove the fan. (See Figure 23)
7. Re-install the components by referring to the
removal procedure, above.
Figure 20
Figure 21
Figure 22
Figure 23

17 Room Air Conditioner
6. Shroud
1. Remove the fan. (Refer to section 21)
2. Remove the screw that fastens the shroud.
3. Remove the shroud. (See Figure 24)
4. Re-install the component by referring to the
removal procedure, above.
7. Motor
1. Remove the cabinet. (Refer to section 18)
2. Remove the cover control and disconnect a wire
housing in control box. (Refer to section 19)
3. Remove the blower. (Refer to section 21)
4. Remove the fan. (Refer to section 22)
5. Remove the 4 screws which fasten the motor.
(See Figure. 25)
6. Remove the motor.
7. Re-install the components by referring to the
removal procedure, above.
8. Compressor
1. Remove the cabinet. (Refer to section 18)
2. Discharge the refrigerant system using FreonTM
Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the FreonTM . Leave the valve in place after
servicing the system.
3. Disconnect the 3 leads from the compressor.
4. After purging the unit completely, unbrace the suc-
tion and discharge tubes at the compressor con-
nections.
5. Remove the 3 nuts and the 3 washers which fas-
ten the compressor.
6. Remove the compressor. (See Figure 26)
7. Re-instill the components by referring to the
removal procedure, above.
Disassembly
Electrical Parts
Figure 24
Figure 25
Figure 26

Service Manual 18
Disassembly
9. Capacitor
1. Remove the control box. (Refer to section 19)
2. Remove the knobs and the screw that fasten
control panel from control box.
3. Remove the screw that located in the front.
4. Open the bottom side of control box.
5. Remove the screw and the clamp that fastens
the capacitor.
6. Disconnect all the leads of capacitor terminals.
7. Re-install the components by referring to the
removal procedure, above. (See Figure 27)
10. Power Cord
1. Remove the control box. (Refer to section 19)
2. Open the control box. (Refer to section 25)
3. Disconnect the grounding screw from the control
box.
4. Disconnect the 2 receptacles.
5. Remove a screw which fastens the clip cord.
(See Figure 28)
6. Remove the power cord.
7. Re-install the component by referring to the
above removal procedure, above.
(Use only one ground-marked hole for ground
connection.)
8. If the supply cord of this appliance is damaged, it
must be replaced by the special cord. (The
special cord means the cord that has the same
specification marked on the supply cord attached
at the unit.)
11. Thermistor
1. Remove the control box. (Refer to section 19)
2. Unfold the control box. (Refer to section 25)
3. Disconnect the themistor terminals from main
P.W.B Assembly.
4. Remove the thermistor.
6. Re-install the components by refereing to the
above removal procedure above. (See Figure 29)
12. Synchronous Motor
1. Remove the control box. (Refer to section 19)
2. Unfold the control box. (Refer to section 25)
3. Remove the crankshaft.
4. Disconnect all the leads of the synchronous
motor.
5. Remove the 2 screws which fasten the syn-
chronous motor. (See Figure. 30)
6. Re-install the components by referring to the
above removal procedure above.
Figure 28
Figure 27
Figure 29
Figure 30

19 Room Air Conditioner
Disassembly
CAUTION: Discharge the refrigerant
system using a FreonTM Recovery
System. If there is no valve to attach the
recovery system, install one (such as a
WATCO A-1) before venting the FreonTM.
Leave the valve in place after servicing
the system.
13. Condenser
1. Remove the cabinet. (Refer to section 18)
2. Remove the 4 screws that fasten the brace.(Refer
to section 20)
3. Remove the 5 screws that fasten the condenser
and shroud.
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the condenser
connections.
5. Remove the condenser.
6. Re-install the component by referring to notes.
(See Figure 31)
14. Evaporator
1. Remove the cabinet. (Refer to section 18)
2. Remove the 2 screws that fasten the evaporator.
3. Move the evaporator sideways carefully.
(Refer to section 20)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the evaporator
connections.
5. Remove the evaporator.
6. Re-install the component by referring to notes.
(See Figure 32)
15. Capillary Tube
1. Remove the cabinet. (Refer to section 18)
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.(See caution above)
3. Remove the capillary tube.
4. Re-install the component by referring to notes.
Refrigerating Cycle
Figure 31
Figure 32

Service Manual 20
Disassembly
—Replacement of the refrigeration cycle.
1. When replacing the refrigeration cycle, be sure to
Discharge the refrigerant system using a FreonTM
recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the FreonTM. Leave the valve in place after
servicing the system.
2. After discharging the unit completely, remove the
desired component, and unbraze the pinch-off
tubes.
3. Braze service valves into the pinch-off tube ports,
leaving the valves open.
4. Braze the pinch-off tubes with Service valves.
5. Evacuate as follows.
1) Connect the vacuum pump, as illustrated figure
33A.
2) Start the vacuum pump, slowly open manifold
valves A and B with two full turns counterclockwise
and leave the valves open.
The vacuum pump is now pulling through valves
A and B up to valve C by means of the manifold
and entire system.
CAUTION: If high vacuum equip-
ment is used, just crack valves A
and B for a few minutes, then open slowly
with the two full turns counterclockwise.
This will keep oil from foaming and being
drawn into the vacuum pump.
3) Operate the vacuum pump vaccum for 20 to 30
minutes, until 600 microns of vaccum is obtained.
Close valves A and B, and observe vacuum gauge
for a few minutes. A rise in pressure would indi-
cate a possible leak or moisture remaining in the
system. With valves A and B closed, stop the vac-
uum pump.
4) Remove the hose from the vacuum pump and
place it on the charging cylinder. See figure 33B.
Open valve C.
Discharge the line at the manifold connection.
5) The system is now ready for final charging.
6. Recharge as follows :
1) Refrigeration cycle systems are charged from the
High-side. If the total charge cannot be put
in the High-side, the balance will be put in the
suction line through the access valve which you
installed as the system was opened.
2) Connect the charging cylinder as shown in figure
33B.
With valve C open, discharge the hose at the mani-
fold connection.
3) Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
4) If more charge is required, the high-side will not
take it. Close valve A.
5) With the unit running, open valve B and add the
balance of the charge.
a. Do not add the liquid refrigerant to the Low-
side.
b. Watch the Low-side gauge; allow pressure to
rise to 30 lbs (0.2Mp).
c. Turn off valve B and allow pressure to drop.
d. Repeat steps b. and c. until the balance of the
charge is in the system.
6) When satisfied the unit is operating correctly,
use the pinch-off tool with the unit still running
and clamp on to the pinch-off tube. Using a tube
cutter, cut the pinch-off tube about 2 inches from
the pinch-off tool. Use sil-fos brazing rod and braze
pinch-off tube closed. Turn off the unit, allow it to
set for a while, and then test the leakage of the
pinch-off connection.
NOTICE