Charging Refrigerant - Haier 1UH071N1ERG Installation Manual

INFORMATION
After opening the stop valve, it is possible that the
pressure in the refrigerant piping does not rise. This
migeh be caused by e.g. the closed state of the
expansion valve in the outdoor unit circuit, but does not
present any problem for correct operation of the unit.

9. Charging refrigerant

9.1. Important information regarding the
refrigerant used
This product contains fluorinated greenhouse gases
covered by the Kyoto Protocol.
the atmopsphere.
Evacuate Indoor Unit and interconnecting pipework to
a vacuum pressure of 500 microns and hold for 15
minutes.
The Outdoor unit is supplied with refrigerant HFC-410A
(R410A) sufficient for 30m line length.
Calculate additional refrigerant to suit your line length;
refer supplied Specification Sheet.
Open the service valve at the Outdoor unit to allow
refrigerant to flow throughout the system.
For long line lengths, oil (of the correct type) should be
added to the refrigerant system at the rate shown in the
Specification Date table.(see paragraph 9.5)
Leak check all brazed and fitted joints.
9.2. Precautions and general guidelines
When servicing the unit requires the refrigerant system
to be opened, treatment and evacuation of refrigerant
must be done in accordance with applicable legislation.
Refrigerant can not be charged until field wiring has been
completed.
Refrigerant may only be charged after performing the
leak test and vacuum drying.
CAUTION
When charging a system, care shall be taken that
its maximum permissible charge is never exceeded,
in view of the danger of liquid hammer.
WARNING
Refrigerant cylinders shall be opened shlowly.
Always use protective gloves and protect your eyes
when charging refrigerant.
DANGER
When the power is on, please close the front panel
when leaving the unit unattended.
Charging with an unsuitable substance may cause
explosions and accidents, so always ensuren that
the appropriate refrigerant (R410A) is charged.
Do not vent gases into
This unit requires additional charging of refrigerant
according to the length of refrigerant piping connected
at the site.
Make sure to charge the refrigerant in liquid state to the
liquid pipe. Since R410A is a mixed refrigerant, its
composition changes if charged in its gaseous state and
normal system operation would then no longer be assured.
Before charging, check whether the refrigerant cylinder
has a suphon attached or not and position the cylinder
accordingly.
Fill using a cylinder
with a siphon
attached Charge the
liquid refrigerant with
the cylinder in upright
position.
On this model it is not necessary to charge additionally if
the piping length 30m.
9.3. Complete recharging
NOTICE
Berore recharging, make sure to execute vacuum
drying of the intermal piping of the unit as well. To do
so, use the internal service port of the unit. Do not use
the service ports located on the stop valve, since
vacuum drying can not be performed properly from
these ports.
Outdoor units have 1 port on the piping. It is between
the heat exchanger and the 4-way valve.
In case complete recharging is required (after a leak, etc.),
refer to teh information below to determine the necessary
amount of refrigerant.
WARNING
Some sections of the refrigerant circuit may be
isolated from other sections caused by components
with specific functions (e.g. valves). The refrigerant
circuit therefore features additional service ports for
vacuuming, pressure relief or pressurizing the circuit.
In case it is required to perform brazing on the unit,
ensure that there is no pressure remaining inside
the unit. Internal pressures need to be released with
ALL the service ports indicated on the figures below
opened. The location is depending on mode type.
16
Fill using a cylinder
with a siphon attached
Charge the liquid
refrigerant with the
cylinder in up-side-
down position.