13
English
charge table for Adjusting charge from suction pipe size
(c)-2
Actual Line Set
Length (ft.)
3.5-5.0 Ton
Adjust refrigerant (oz.)
Suction Line
Diameter (inch)
7/8”
1 1/8”
12-15
2
–
20-25
4
–
30-40
6
–
40-50
9
–
50-60
11
–
60-70
12
–
70-80
14
–
80-90
16
–
90-100
18
–
c
onnect
a
Ir
c
ondItIoner
to
S
yStem
cAUtion
open the lIquId valve fIrSt!
I
f
the
SuctIon
ServIce
valve
IS
opened
fIrSt
,
oIl
from
the
com
-
preSSor
may
Be
draWn
Into
the
Indoor
coIl
,
reStrIctIng
refrIger
-
ant
floW
and
affectIng
operatIon
of
the
SyStem
.
cAUtion
poSSIBle refrIgerant leak!
t
o
avoId
a
poSSIBle
refrIgerant
leak
,
open
the
ServIce
valveS
untIl
the
top
of
the
Stem
IS
1/8”
from
the
retaIner
.
cAUtion
e
nSure
valveS
are
open
and
addItIonal
charge
IS
added
per
chart
Before
applyIng
poWer
.
Charge additional refrigerant calculated by STEP formula &
table from liquid service valve. (NOT from suction side.)
When opening service valves, open each valve only until the
top of the stem is 1/8” from the valve. To avoid loss of refriger-
ant, DO NOT apply pressure to the retainer. When opening
valves without a retainer, remove service valve cap and insert
a hex wrench into the valve stem and back out the stem by
turning the hex wrench counterclockwise.
After the refrigerant charge has bled into the system, open
the liquid service valve. The service valve cap is the second-
ary seal for the valves and must be properly tightened to
prevent leaks. Make sure cap is clean and apply refrigerant
oil to threads and sealing surface on inside of cap. Tighten
cap finger-tight and then tighten additional 1/6 of a turn to
properly seat the sealing surfaces.
Break vacuum by fully opening liquid and suction base valve.
note:
Units have front seating valves. These are not back-
seating valves. It is not necessary to force the stem tightly
against the rolled lip.
e
quIvalent
length
calculatIon
note:
The following table lists the equivalent length gained
from adding bends to the suction line. Properly size the suc-
tion line to minimize capacity loss.
Type of Elbow Fitting
Inside Diameter
3/4
7/8
1 1/8
90° short radius
1.7
2
2.3
90° long radius
1.5
1.7
1.6
45° radius
0.7
0.8
1
unit: inch
