Tadiran Telecom MINI-VRF Installation Manual page 11

l0Vacuumizing
1)
Thevacuumpumphasthevacuurndegreeoflessthan-0.lMPaandtheairdisplacementofmorethan40l/min.
2)
It
is unnecessary to vacuumize the outdoor
unit. Don't
open the check valves
at the gas side and the liquid
side
ofthe
outdoor
unit.
3)
Makesurethevacuumpumpcandropupto-0.lMPawithin2hours;ifitfailstodropupto-0.lMpaafter3hours,checkmoistureorairleak.
4)
The vacuum pump mirst have
a
check valve.
Comect
the
vacuum pump
Rutr the vacuum
pmp
(above 2
hours)
After
dropping up to -0.
1
MPa,
the
vacum
pMp
keeps on
ruming
for 20-60 minutes,
Remain
vacuum (above lh)
4.1
I
Refilling
volme
of refiigerant
The
refilling
volume ofrefrigerant (R4l0A)
is
calculated according to the diameter and length
ofthe pipe at the
liquid
side
ofthe
indoor
and outdoor units.
Note:
The R4
I
0A refrigerant must
be
weighed by
an electronic
scale and
filled
in the liquid
state.
4.12
Stop valve instructions
I
)
It
is closed when leaving rhe
factory;
2)
Open
the valve counterclockwise
or clilsg
the
valve clo-ckwise with
a
6mm
socket head wrench:
3)
After
completing the operation, tighten
the
valve cover;'
4)
R4l0Aspecialtoolshallbeusedtovacuumizethevalveand_f,rlltherefrigerantattheserviceentrance.Filltherefrigerantattheserviceentranceatthe
'
gas side, and
vacuumize the valve
at
the service entrance at the
liquid
sidE and the gas
side simultaneously.
Refilling refrigerml
Liquid
side
Fig.4-9
Stop Valve Instructions
l.
Close the valve ofthe piessue
gauge;
2.
Discomect the pressurc gauge md
the
pmp;
3.
Close the
vrcum pmp.
'
Don't
use tools
and
measuring apparatus using in
different refrigerants or directly
contacting the
refrigerant.
.
Don't
exhaust air with refrigerant
gas.
'Ifthevacuumdegreecannotreach-0.lMpa,recheckitsleakage,
Ifnot,keepthevacuumpumponforl-2h.
Table
4-l
Refilling
Volume of Refrigerant