Toshiba RAV-104 Series Installation Instructions Manual page 27

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).
Model (RAV-)
Gas side
Liquid side
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
Permissible Piping Length and Head
The maximum piping length from the
Model (RAV-)
outdoor unit to the indoor unit
134AH/A
164AH/A
264AH/AH8/A/A8
364AH8/A8
464AH8/A8
!
Limit the total number of bends in the pipework to 10 or less.
Pipework Installation
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.
System Purging
!
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 10 5 Pa) at both the liquid and gas sides.
Tel: 01823 665660
Heronhill - for all your Toshiba requirements
R
EFRIGERANT
134/164AH/A 264A/A8
Ø12.7mm ( 1
2 ")
/
Ø6.4mm ( 1
4 ")
/
The maximum height difference from the outdoor unit to the indoor unit –
30m
50m
~ 27 ~
www.heronhill.co.uk
P
IPING
264AH/AH8
Ø15.9mm ( 5
8 ")
/
Ø9.5mm ( 3
8 ")
/
8 ").
/
When the outdoor unit is above
30m
50m
364/464AH8/A8
Ø19.0mm ( 3
4 ")
/
Ø9.5mm ( 3
8 ")
/
When the outdoor unit is below
15m
20m
Fax: 01823 665807
GB