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R
EFRIGERANT
P
IPING
Precautions for R407C Outdoor Units
R407C outdoor units use synthetic oils which are extremely hygroscopic. Therefore ensure that
the refrigerant system is NEVER exposed to air or any form of moisture.
Mineral oils are unsuitable for use in these units and may lead to premature system failure.
Use only equipment which is suitable for use with R407C. Never use equipment which has been
used with R22.
R407C should only be charged from the service cylinder in the liquid phase. It is advisable to use
a gauge manifold set equipped with a liquid sight glass fitted in the centre (entry) port.
!
!
!
!
Material and Sizes
Materials and pipes required for connection between the indoor and outdoor units.
Piping material: Seamless, deoxidised copper piping for air conditioning (refrigeration quality tube).
!
If models RAV-364AH8/A8; 464AH8/A8 are installed with a pipe length of more than 30m, the diameter
of the gas pipe must be increased to Ø22.2mm (7
/
8").
!
Permissible Piping Length and Head
Model (RAV-)
134AH/A
164AH/A
264AH/AH8/A/A8
364AH8/A8
464AH8/A8
The maximum piping length from the
outdoor unit to the indoor unit
The maximum height difference from the outdoor unit to the indoor unit –
When the outdoor unit is above
When the outdoor unit is below
30m
30m
15m
50m
50m
20m
Limit the total number of bends in the pipework to 10 or less.
When installing the pipework it is essential that the following points are adhered to:
(i)
Cleanliness is essential – keep the pipework securely sealed at all times during the installation.
(ii) No sight glass should be fitted to the liquid pipe.
(iii) Do not incorporate an oil trap in vertical pipework.
(iv) Displace all air with oxygen-free-nitrogen.
!
!
Pipework Installation
When removing air and dehydrating refrigerant pipework, use an approved type of vacuum pump
only. Do NOT use the factory charge to purge the air.
Ensure a vacuum is drawn at -76cmHg (-1.013 x 105 Pa) at both the liquid and gas sides.
!
System Purging
!
Model (RAV-)
134/164AH/A
264A/A8
264AH/AH8
364/464AH8/A8
Gas side
Ø12.7mm (1
/
2")
Ø15.9mm (5
/
8")
Ø19.0mm (3
/
4")
Liquid side
Ø6.4mm (1
/
4")
Ø9.5mm (3
/
8")
Ø9.5mm (3
/
8")
Piping
Size
Heronhill - for all your Toshiba requirements
Tel: 01823 665660
www.heronhill.co.uk
Fax: 01823 665807