Haier AU242FHBHA Installation Manual page 11

Installation Procedures
AU242~342 type: Maximal length and drop height permissible of refrigerant piping
Total length of piping (actual length)
Longest piping L
Piping length of indoor unit which is furthest to the first
branch piping L
Drop height between indoor and
outdoor unit H
Drop height between indoor units h
AU482~522 type and AU48~60 type: Maximal length and drop height permissible of refrigerant piping
Total length of piping (actual length)
Longest piping L
Piping length of indoor unit which is furthest to the first
branch piping L
Drop height between indoor and
outdoor unit H
Drop height between indoor units h
4. Pipes connecting the outdoor and indoor units must be blown clean.
Compressed air is used to remove all foreign articles from the inside of pipes. Compared with R22,407C refrigerant
is more likely to be affected by moisture, oxides, dust and grease. Special care Hould be taken to avoid contamination
from these materials in the pipes. The following process should be used for pipe cleaning.
Refrigerant must be added in liquid state.
Refrigerant bottles with or without a siphon tube can
be refilled withr refrigerant upright or upside down,
respectively.
1) Relief valve on the Nitrogen bottle
(Gaseous refrigerant may condense, and oxygen and inflammable gas may cause explosions.)
2) Connect the outdoor unit gas pipes and liquid pipes to the low and high pressure joints on the instrument distributor.
INDOOR UNIT
N
2
3) While cleaning the indoor unit, all other pipes on the sides of
the indoor unit should be fitted with plugs.
Actual length
Up outdoor
Under outdoor
Actual length
Up outdoor
Under outdoor
Adding R407C refrigerant
Using Oxygen and/or inflammable or toxic gas is prohibited
Reducing joint
1
Permissible value
L
50m
35m
L
15m L
30m
20m
10m
Permissible value
100m L
70m L
30m L
30m
20m
10m
Containers for R407C refrigerant must be marked
with R407C and a brown stripe.
R407C and R22 refrigerants can not share the
same instrument distributor and filling pipes.
Warning
Instrument
distributor
V
V
L
H
Copper pipe
10
Connecting piping
Piping part
+L +a+b+c
1 2
+L +c
1 2
+c
2
Piping part
+L +L +L +a+b+c+d+e
1 2 3 4
+L +L +L +e
1 2 3 4
+L +L +e
2 3 4
valve
Pressure
Nitrogen
reducing
Bottle
valve
6.4
Plug (Copper)
Expanding nut
Copper pipe