Gree GWC09AA, Installation And Service Manual

Page: 100 / 136

GREE Service Manual GWC09AA / K5NNA6A Page 100
Charging with HC R-290 refrigerant
Remember that the GREE HC Air–conditioner is an intrinsic safe system where
modifications of the refrigerant circuit are not acceptable. This applies specifi-
cally to the length of refrigerant pipes and the amount of charged refrigerant.
The specified refrigerant charge of the AC Split-Unit is exactly 0.2 kg (200
grams) of HC R-290. The specified amount of refrigerant for the air–conditioners
design-conditions is indicated on the data-plate and rated in kilograms.
In case of lack of refrigerant!
The operation of the GREE Air–conditioner is only permitted with the use of re-
frigerant R-290 for this specific technology.
Extreme care should be taken not to overfill the system. Topping up of the sys-
tem with refrigerant is not permitted. This will infringe the safety certification of
the air–conditioner. If a loss of refrigerant is indicated you are advised to carry
out the following activities;
1. Always follow the advices stated within this manual, to provide a safe work-
ing area. Refer to pages 74 and 75 of this manual.
2. Vent the remaining amount of refrigerant as indicated on pages 76 to 80 of
this manual.
3. Flush the system with OFDN, see pages 83 and 84.
4. Carry out a leak test (leak finding) with OFDN and a soapy water solution,
see pages 89 and 90.
5. Repair the leak or replace the defective component by using only OEM
spare-parts.
6. Carry out a pressure test with subsequent leak test, see pages 94 and 95.
7. Evacuate and dehydrate the system, see pages 96 to 99.
8. Recharge the system with the specified amount of 0.2 kg of HC R-290 refrig-
erant, following the given guideline within this chapter.
9. A follow up leak test using an appropriate HC leak detector should always be
carried out prior to leaving the site.
The process of charging
The charging of RAC systems with HC refrigerants is similar to those using
halocarbon (e.g. HCFC R-22) refrigerants. Since Hydrocarbon R-290 (Propane)
is a pure refrigerant the charging can take place in gaseous or liquid state.
Keeping in mind that the specified refrigerant charge amount of the GREE Air–
conditioner is relatively low and service port of the AC unit is provided at the low
-pressure side only, the charging of this system can be done by taking only va-
pour from the refrigerant cylinder and charging to the suction line of the com-
pressor by measuring the weight of refrigerant. The charging amount should be
monitored by the use of accurate and sensitive scales. For safety reasons and
to provide accurate charging, the smallest refrigerant cylinder sizes possible
should be used.
Arrange your equipment and tools as indicated on pages 100 and 101.
NEVER Top-Up
the system with
refrigerant,
always follow
the guidelines
provided with
this chapter!
Do not back-
ward retrofit the
GREE Air-
Conditioner to
any other re-
frigerant. This
will result in the
operation of the
system away
from the design
conditions,
causing a loss
of system effi-
ciency.
The operation
of the system
with any other
type of refriger-
ant can cause
system failure
and probably
violation of
property and
health.
Example of a sensitive charging
scale:
Capacity = 100 kg
Accuracy = +/- 0.5 %
Resolution = 2 gram