Toshiba RAV-SM1102AT-E Manual page 16

7
FINAL INSTALLATION CHECKS
Recovery method of refrigerant
When recovering refrigerant in case of reinstallation of the indoor or outdoor unit, etc., use the refrigerant recov-
•
ery switch SW802 on the cycle control P .C. board of the outdoor unit.
Work procedure
1. Turn on the power supply.
2. Using the remote controller, set FAN opera-
tion to the indoor unit.
3. Pushing the refrigerant recovery switch
SW802 on the cycle control P .C. board of the
outdoor unit starts the forced cooling opera-
tion. (Max. 10 minutes), and then the refrig-
erant is recovered by operation of the valve.
4. After recovery of the refrigerant, push the
refrigerant recovery switch SW802 together
with closing the valve.
The operation stops.
5. Turn off the power supply.
Installation/Servicing Tools
In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged accidentally,
service port diameter of the outdoor unit control valve (3 way valve) has been changed. (1/2 UNF 20 threads per inch)
• In order to increase the pressure resisting strength of the refrigerant piping flare processing diameter and size of
opposite side of flare nuts has been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)
New tools for R410A
New tools for R410A
Gauge manifold
Charge hose
Electronic balance
for refrigerant charging
Torque wrench
(nominal diam. 1/2, 5/8)
Flare tool
(clutch type)
Gauge for projection adjustment
Vacuum pump adapter
Gas leakage detector
• Incidentally, the "refrigerant cylinder" comes with the refrigerant designation (R410A) and protector coating in the
U,S.'s ARI specified rose color (ARI color code: PMS 507).
• Also, the "charge port and packing for refrigerant cylinder" require 1/2 UNF 20 threads per inch corresponding to the
charge hose's port size.
Applicable to R22 model
× × × × ×
× × × × ×
¡
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¡
— —
¡
× × × × ×
Take care for an electric shock because the
control P.C. board is electrified.
Changes in the product and components
As pressure is high, it is impossible to measure by means of conventional
gauge. In order to prevent any other refrigerant from being charged, each
port diameter is changed.
In order to increase pressure resisting strength, hose materials and port
size are changed (to 1/2 UNF 20 threads per inch).
When purchasing a charge hose, be sure to check the port size.
As pressure is high and gasification speed is fast, it is difficult to read the
indicated value by means of charging cylinder, as air bubbles occur.
The size of opposite sides of flare nuts have been increased. Incidentally,
a common wrench is used for nominal diameters 1/4 and 3/8.
By increasing the clamp bar's receiving hole, strength of spring in the tool
has been improved.
Used when flare is made with using conventional flare tool.
Connected to the conventional vacuum pump. It is necessary to use an
adapter to prevent vacuum pump oil from flowing back to the charge hose.
The charge hose connecting part has two ports-one for conventional
refrigerant (7/16 UNF 20 threads per inch) and one for R410A.
If the vacuum pump oil (mineral) mixes with R410A a sludge may occur
and damage the equipment.
Exclusive for HFC refrigerant.
13
Outdoor unit cycle control
P.C. board
DANGER
Changes
SW802
Refrigerant
recovery
SW
SW801
CN804
Optional
connector