High Wall, Heat Pump Type
Service Manual
59
Toshiba
9-2-3. Installation/Service Tools
Changes in the product and components
On air conditioners using R410A, in order to prevent any other refrigerant from being accidentally charged, the
service port diameter size 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
opposing flare nuts sizes have been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)
New tools for R410A
• 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” requires 1/2 UNF 20 threads per inch corresponding
to the charge hose’s port size.
New tools for R410A
Applicable to R22 model
Changes
Gauge manifold
As the working pressure is high, it is impossible to measure the
working pressure using conventional gauges. In order to prevent
any other refrigerant from being charged, the port diameters have
been changed.
Charge hose
In order to increase pressure resisting strength, hose materials
and port sizes have been changed (to 1/2 UNF 20 threads per
inch).
When purchasing a charge hose, be sure to confirm the port size.
Electronic balance for refrigerant
charging
As working 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.
Torque wrench
(nominal dia. 1/2, 5/8)
The size of opposing flare nuts have been increased.
Incidentally, a common wrench is used for nominal diameters 1/4
and 3/8.
Flare tool (clutch type)
By increasing the clamp bar’s receiving hole size, strength of
spring in the tool has been improved.
Gauge for projection adjustment
—
—
Used when flare is made by using conventional flare tool.
Vacuum pump adapter
Connected to conventional vacuum pump. It is necessary to use
an adapter to prevent vacuum pump oil from flowing back into the
charge hose. The charge hose connecting part has two ports —
one is for conventional refrigerant (7/16 UNF 20 threads per inch)
and the other is for R410A. If the vacuum pump oil (mineral) mixes
with R410A, a sludge may occur and damage the equipment.
Gas leakage detector
Exclusive for HFC refrigerant.
+00A08-010_01EN_SVM_HighWallHeatPump.book Page 59 Wednesday, March 4, 2009 11:22 AM
