Haier 1UH071N1ERG Installation Manual - 7. Refrigerant Piping
11
For new installations, use the standard pipe sizes.
When using existiong pipes, size-up is allowed as
mentioned in the table above.
Additional restrictions towards allowable pipe lengths,
as mentioned in the table 7.3
on page 11, must be
taken into account.
Not using the standard lpipe size may result in
capacity decrease. The installer must acknowledge
this and judge this very carefully in function of the
complete installation.
Existing or pre-installed piping can be used
1. Piping must comply with the criteria below.
Piping diameter must comply with the limitations as
indicated
in paragraph "7.2. Refrigerant pipe size " on
page 11.
Piping length must be withinlimits of the allowable piping
length as in paragraph "7.3. Allowable pipe length and
height difference" on page 11.
Piping must be designed for R410A. See paragraph
"6.2. Selection of piping material" on page 10.
2. Piping can be reused without cleaning when:
Total 1-way piping length: 50m.
No compressor breakdown has occurred in the history
of the unit to be replaced.
A correct pump down operation can be executed:
- Operate the unit continuously for 30minutes in cooling
mode.
- Execute a pump down operation.
- Remove the air conditioning units to be replaced.
Check the contamination inside the existing piping.
If you cannot meet all these requirements, the existing
pipes must be cleaned or replaced after removing the air
conditioning units to be replaced.
3. Prepare the flare connections for higher pressure. See
paragraph 6.2
The stem cap is sealed where indicated by the arrow.
Take care not to damage it.
After handling the stop valve, make sure tighten the stem
cap securely. For the tightening torque, refer to the table
below.
Check for refrigerant leaks after tightening the stem cap.
Cautions on handling the stem cap
Always use a charge hose equipped with a valve
depressor pin, since the service port is a Schrader type
valve.
After handling the service port, make sure to tighten the
service port cap securely. For the tightening torque, refer
to the table below.
Check for refrigerant leaks after tightening the service
port cap.
Cautions on handling the service port
7.2. Piping size for single split
7.3. Limitations for one way piping length and vertical
height difference for single split
Model
Install the removed flare nuts
to the pipes to be connected,
then flare the pipes.
One way piping
length
Vertical height
difference
(between indoor
and outdoor)
ABH125K1ERG
ABH140K1ERG
ABH125K1ERG
ABH140K1ERG
Diameter of pipe
9.52mm
Liquid pipe
15.88mm
Gas pipe
Pipe
Model
7. Refrigerant piping
90+0.5
7.1. Piping diagram for single split
Outdoor
unit
Gas pipe
Liquid
pipe
Flare connection
Indoor
unit
3-way stop valve
3-way stop valve
less than 50 m
less than 30 m
less than 75 m
less than 30 m
ABH071H1ERG
ABH090H1ERG
ABH105H1ERG
ABH071H1ERG
ABH090H1ERG
ABH105H1ERG
NOTICE