Daikin LREN8A7Y1B - Page 74

15 | Piping installation
Installer and user reference guide
74
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
Requirement Limit
LREN* LREN* + LRNUN5*
Piping length between LREN* and
LRNUN5*
Not specified, but piping must be
horizontal
Maximum branch piping length
▪ Example refrigeration side:
- C+D+(E or F)
(a)
- c+d+(e or f)
(a)
- c+g
- j
50m
Maximum total piping length 180m
Maximum height
difference
between outdoor
unit and indoor
unitFN
Outdoor higher
than indoor
Example: H3≤Limit
35m
(c)
Outdoor unit lower
than indoor unit
Example: H3≤Limit
10m
Maximum height difference between
blower coil and showcase
▪ Example: H2≤Limit
5m
(a)
Whichever is longer
(b)
For low load restrictions, see "13.5.1Constraints for refrigeration"[454].
(c)
You may have to install an oil trap. See "To install an oil trap"[474].
To install an oil trap
If the outdoor unit is installed higher than the refrigeration indoor unit, install an
oil trap in the gas piping every 5 meter. Oil traps will make the oil return more
easily.
a
c
b
c
a Showcase
b Height difference=5m
c Trap
The refrigerant suction piping must always run down: