Charging Refrigerant - Haier 1U160S2SP1FB 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. Do not vent gases into
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 (R32) is charged.
„ 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, checkwhetherthe 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 (aftera leak, etc.),
refer to teh information below to determine the necessary
amount of refrigerant.
WARNING
Some sections ofthe refrigerant circuit may
be isolated from other sections caused by components
with specificfunctions (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.
18
Fill using a cylinder
with a siphon
attached Charge the
liquid refrigerant with
the cylinder in up-
side- down position.