Service manual

22
8 REFRIGERANT PIPING
Indoor unit connection example
• Connect one R-Converter unit per indoor unit.
• Connect the R-Converter unit the liquid pipe.
• The thermistor-L (liquid) is installed close to the connecting
point of the extension piping (liquid) for the indoor unit.
• The thermistor-G (gas) is installed close to the connecting
point of the extension piping (gas) for the indoor unit.
Refrigerant piping system
W For details, see PUMY series technical & service manual.
Install sections a, b, c, d and e as shown in the illustration to
the R-Converter unit.
Piping connection size
Additional refrigerant quantity
• If necessary, add additional refrigerant to the unit by
following the calculation method given in the outdoor unit
(PUMY) manual.
• When calculating the refrigerant quantity, be sure to include
the R-Converter unit-to-indoor unit liquid pipe length.
• The installation condition for the R-Converter unit-to-indoor
unit are as shown in the illustration below.
• The refrigerant pipe length from the indoor unit to the
R-Converter unit must be less than 10 m and its height
difference less than 8 m.
• Install the R-Converter unit within an indoor-unit-to-indoor-
unit height difference of 12 m.
• Match the refrigerant piping size to the indoor unit.
Indoor unit capacity
*R-Converter unit
Liquid pipe size (mm)
BTU
07
09
12, 13
18
24, 30
HP
-
1
1.6
2
2.5



{6.35 o 0.8
{9.52 o 0.8
{6.35 o 0.8
W If using a liquid pipe that is [9.52 mm, use joint pipe
“PAC-493PI” (optional parts) or a locally procured tandem
joint ([6.35➝[9.52 mm)
OC296--1.qxp 03.6.11 9:37 AM Page 22