
It shall use the va uum p
ump of (lower than -755mmHg)high va uum degree and large air
dis harging (over 40l/min).
The va uumizing time depends on the length of the onne ting pipe, generally is 1~2 hours.
When va uumizing, it shall be onfirmed both gas and liquid side valves are losed.
If after 2 hours va uumizing, it annot rea h the va uum degree below -755mmHg, it an be
va uumized for other 1 hour.
If after 3 hours va uumizing, it still annot rea h the va uum degree below -755mmHg, he k
if there is any leaking point and repair the them.
If after over 2 hours va uumizing, the va uum degree is below -755mmHg, lose the VL
and VH on the meter separator and stop va uumizing. 1 hour later to onfirm if the va uum
degree hanges. If hanges, it indi ates there is leaking point in the system. Che k the leaking
point and repair.
After finishing the above va uumizing, hange the va uum pump into refrigerant pump to
harge the refrigerant.
Use va uum pump to perform va uumizing. It is stri tly forbidden to use the
refrigerant to remove the air inside the system.
After air tightness test and dis harging all the nitrogen, onne t the va uum pump
as the following figure shown.
Refriger nt piping
10
When the total length (L) of the two units' onne ting pipe is less than 5m, it is
unne essary to harge additional refrigerant.
If the onne ting pipe (L) ex eeds 5m, it shall harge Mg additional refrigerant per meter.
That is: Refrigerant harging amount = (L-5) x M (g)
For HBU-28CH03,HBU-28HH03, HBU-42CH03, HBU-42CI03,HBU-42HI03 M=65
Only in COOLING operation an harge the additional refrigerant.
When harging, the refrigerant shall be harged from the harging nozzle of low pressure vavle.
Be arefull when harging refrigerant, do not let the air mix into the system,and must harge the
additional refrigerant in liquid ondition.
6. Piping and indoor unit va uumizing
7. Charging amount of refrigerant
2-wayor 3-way valve totally losed
(Liquid side)
Indoor units
Indoor Outdoor
Completely tightened
Completely tightened
Outdoor units
Va uum pump
Dis harging valve
3-way valve totally losed
(Gas side)
Low pressure peizometer
High pressure peizometer
Meter separator
V LVH
Flare part
Flare part
P
Inst ll tion Procedure
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