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Technical Information

Service Manual

HC R290 Refrigerant Lssues

Basics

HC R-290 (propane) is an odourless and colourless gas of the group of hydrocarbons.

HC R-290 is heavier than air and at high concentrations can cause

narcotic effects and eventually asphyxiation.

R-290 is highly ammable within the range of 2,1% and 9,5% by volume, or 38

g/m3 to 170 g/m3 in air. The auto-ignition temperature is about 470°C.

Since R-290 is an odourless and colourless gas, it is difcult to perceive that it is

present (as with most other refrigerants).

Propane is often used as a fuel such as for heating or barbecues. However, for

use on refrigeration systems, fuel-grade propane is not suitable since it contains

high levels of impurities, which would damage the refrigeration system and may

not provide the desired refrigerating capacity or efciency.

Please notice that the unit is filled with propane. Details to this refrigerant are found in chapter “refrigerant”. Propane is highly

ammable and leads to explosion under certain conditions. Inappropriate treatment of the unit involves the risk of severe damages

of people and material.

The structural formula of HC R-290 (propane)

HC R-290 refrig-

erant has a high

grade of purity.

Propane as a

cooking gas is

not useful for

refrigeration

purpose!

Important R efrigerant P roperties and

Parameters:

Molecular formula C3H8

Melting point [°C] -188

Boiling point under atmospheric pressure [°C] -42

Molar mass [g mol -1] 44,10

Critical temperature [ °C] 96,8

Critical pressure [bar] 42

Practical limit [g/m3 ] 8

Lower ammability level LFL [g/m3 ] 38

Lower ammability level LFL [ %] 2,1

Upper ammability level UFL [ g/m3] 171

Upper ammability level UFL [ %] 9,5

Ignition temperature [ °C] 470

Gree GPC07AK-K5NNA2A User Manual

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