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5 Installation
5.12.7
Opening the stop valves
Fig.215
2
Fig.216
4
5.12.8
Charging recommendations
5.12.9
Additional refrigerant charge
Tab.136
Outdoor unit refrigerant
precharge
Maximum refrigerant pipe
length with pre-charge
184
Once the leak-tightness has been checked and the refrigerant circuit
evacuated, open the stop valves to allow the refrigerant to circulate.
1
MW-1001652-3
3
MW-1001653-3
In addition to conventional charging procedures, the following
requirements shall be followed.
Prior to recharging the system, it shall be pressure-tested with the
appropriate purging gas. The system shall be leak-tested on completion of
charging but prior to commissioning. A follow-up leak test shall be carried
out prior to leaving the site.
If the refrigerant pipes are longer than the maximum pipe-length allowed
for the outdoor unit precharge, you need to add refrigerant. You can
calculate the quantity of refrigerant to be added with following formula:
Q = 25 x (L - 7.5 x N)
Unit
LSGT40-2M
LSGT50-2M
kg
1
1.03
m
7.5
7.5
1. Open the valve on the liquid line with an Allen key by turning counter-
clockwise until it stops.
2. Put the protective cap back in place. Torque load 14-18 Nm.
3. Open the valve on the gas line with an Allen key by turning counter-
clockwise until it stops.
4. Put the protective cap back in place.
5. Depending on the length of the refrigerant pipes, it may be necessary
to add refrigerant.
Ensure that contamination of different refrigerants does not occur when
using charging equipment. Hoses or lines shall be as short as possible
to minimise the amount of refrigerant contained in them.
Cylinders shall be kept in an appropriate position according to the
instructions.
Ensure that the refrigerating system is earthed prior to charging the
system with refrigerant.
Label the system when charging is complete (if not already).
Extreme care shall be taken not to overfill the refrigerating system.
Q = quantity of refrigerant to add
25 = additional refrigerant charge per meter
L = refrigerant pipe length
7.5 = maximum refrigerant pipe length with pre-charge
N = Number of indoor unit
LSGT60-3M
1.15
7.5
LSGT70-3M
LSGT100-4M
1.45
2.3
7.5
7.5
7800852 - v02 - 10052022
LSGT125-5M
2.3
7.5
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