Refrigerant R410A - Toshiba RAS-07PKVP-E Service Manual

High Wall, Heat Pump Type
2

REFRIGERANT R410A

This air conditioner adopts the new refrigerant HFC (R410A) which does not damage the ozone layer.
The working pressure of the new refrigerant R410A is 1.6 times higher than conventional refrigerant (R22). The
refrigerating oil is also changed in accordance with change of refrigerant, so be careful that water, dust, and
existing refrigerant or refrigerating oil are not entered in the refrigerant cycle of the air conditioner using the new
refrigerant during installation work or servicing time.
The next section describes the precautions for air conditioner using the new refrigerant. Conforming to contents of
the next section together with the general cautions included in this manual, perform the correct and safe work.
2-1. Safety During Installation/Servicing
As R410A's pressure is about 1.6 times higher than that of R22, improper installation/servicing may cause a
serious trouble. By using tools and materials exclusive for R410A, it is necessary to carry out installation/servicing
safely while taking the following precautions into consideration.
• Never use refrigerant other than R410A in an air conditioner which is designed to operate with R410A.
If other refrigerant than R410A is mixed, pressure in the refrigeration cycle becomes abnormally high, and it may
cause personal injury, etc. by a rupture.
• Confirm the used refrigerant name, and use tools and materials exclusive for the refrigerant R410A.
The refrigerant name R410A is indicated on the visible place of the outdoor unit of the air conditioner using
R410A as refrigerant. To prevent mischarging, the diameter of the service port differs from that of R22.
• If a refrigeration gas leakage occurs during installation/servicing, be sure to ventilate fully.
If the refrigerant gas comes into contact with fire, a poisonous gas may occur.
• When installing or removing an air conditioner, do not allow air or moisture to remain in the refrigeration cycle.
Otherwise, pressure in the refrigeration cycle may become abnormally high so that a rupture or personal injury
may be caused.
• After completion of installation work, check to make sure that there is no refrigeration gas leakage.
If the refrigerant gas leaks into the room, coming into contact with fire in the fan-driven heater, space heater, etc.,
a poisonous gas may occur.
• When an air conditioning system charged with a large volume of refrigerant is installed in a small room, it is
necessary to exercise care so that, even when refrigerant leaks, its concentration does not exceed the marginal
level.
If the refrigerant gas leakage occurs and its concentration exceeds the marginal level, an oxygen starvation
accident may result.
• Be sure to carry out installation or removal according to the installation manual.
Improper installation may cause refrigeration trouble, water leakage, electric shock, fire, etc.
• Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a
qualified air conditioner technician or electrician.
Improper repair's may result in water leakage, electric shock and fire, etc.
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Service Manual