SUPERHEAT
RFC
1.
Confirm
proper
airflow
across
(XlII
u6
i
n9
figure
13.
2.
Compare
unit pressures
with
Iable 4. Nannal
Opeta/ing
PI8Ssuros.
~.
U6B
SUPERHEAT
10
correctly
charge
unit
or
to
verify
the
charge
is
correct.
4. Sel\hermosl8l
to
call
for
haal
(musl
ha'le a
tooting
load
belwoen
70·60"F
(21-26
D
C)
5. Conneclgauges8t.
6.
When
heat
demand
Is
satisfied.
selthermostal
to
call for
cooling.
7.
Allow
lal'llPE'",turee
and
pressures
to
Slablli1:e.
6.
Measure
\he
suction
liI'\e
pl'865Uro
Bnd
use
!he
use
vlllue
to
delormlne salurallon
temperaturo
(lable
3):
SAT"
"' _
9.
Record
6uc1ion
line
lemperature:
VAp4,, _
10.
Subtract
to
determine
superheat
(SHD):
VAPO·
__
8A,..
__
~SH"
__
11.
Rocord
Ihe
wet
bulb temperature (air entering
indoor
coil):
WO-
_
12.
Recotd
Ql.lldoor
ambientlemperaMv.
13.
Compare
results
with
lable to
the
left,
J
NOTE
-
Do
no/ athJmp/lo
charge
sY.!l~m
where
a
dash
81J1J9Bf$.
lIyst8m
could
be
ove/'Ch9rged.
Superheat
is taklln
at
sucl/on
line
service
port.
Sue/lo"
IIno
superheat
must
n9VfiJr
bfl/esrslhlJll 5
D
F
at
/he
suc1lon
1/"9
.eIViee
port.
40,-+J,;L.w....~i\,;....,~'G'u......~imfu....:~!.Il.f-!!t.Q"ju...
45'-I-.JJL..w..-Ul.jf-'L~:.....u4.>llL.Jol.lL.JollOl.j-O~t.J..-'!I!t.f.~~
50,--+.1.L-..L:1.....L.I.4...1lL..,...-"4~....loI..L...JoI:lpu.
.........
~'P"'-'"J'
551-1-..ll......LL..~...1L~....c..:IJt"'J......wlI:....Ihl+~Il~~!J-!I"~l.
80-+.L-1.II....l"I--l>l..--........-.
................
r..L...l~
oll>-l
........
l.lI.f-'lII.....!""- I
15-1--=--..JL.....uI.lf-J-""-'-"'-'-"'"t"""~L..o<o.Lj
""--'''''--''"''t
.......
-'LL.-
I
70-t-=--~....L+-UL.....J-w......JJ.l.f-IJ:I....""""'-C1I-'L....wI'~~"""',,"-
I
7
5--+-=--....:..........:....jf-'l-------"'+"'l-...J,;!Ol...-"-4:A~"'--'oUt=-
......- I
1I0-l--=-~--=-Jf_=_.....iI----Il.+'-''--LiL...I.IJ.j,...~:>L'_II.j_.l..L.waL
85-1--=-~--=-Jt_=_-'-~-P''---'-.L.....J41_'L.lZ-..l''-'''''l
90-l--=-~--=-JI_=_-=---:.+-'l----"!-l~f_J~w....~
9-t-=----=---=-t-=---=----=--t-=----"t.......J;lI.lf-J-:L..l
........
.4.I.
100+--..:.--=.¥--=---=-t-=--.:...--ll.1i--L'-...llI..-'-I.J:
1
O"+-=---=--~~--=----=--t-'---=---.i.~z......JLoL..I.LlI
11
OI+=--=---+.:.-.:.--4-=---=--...:...t..D....;j,L..:lil.I~--'iI.
115'--L..:=--=---=-L-=--....:........:...::....:...--=----=-.J.....:.----llL..L~.IL..ll~
•
Dry·bulb
Illmperal\lre
(OF)
of
entering
o\lldoor
ambient
air.
If refrigerant
Is
REMOVI:D.
retest
10
confirm
lhet unil
is
properly
charged.
USE
WEIGH-IN
METHOD
Weigh.in
or
remove
refrigerantl/'---..,r
based
upon
line
length
L
it
.,;
",
..
Ir
value
Is
LESS
than
Ill'lown.
lhen
REMOVE
refrigerant.
If value iii
MORE
than
shown,
then'
E::$
ADD
tefrlge."n!.
If refrigerant
is
ADDED,
retest
10
Figure
18.
HFC410A
Superheat
RFC
Method
Table
3.
HFC-410A Temperature - Pressure (Pslg)
connrm
that unit
is
prOp9rlychllrged.
·F
·C
Pllg
OF
·C
Psig
-40
-4U,U
lUI
lIQ
15.6
170
-35
.31.2
14.9
65
18.3
185
-30
-34.4
1M
70
21.1
201
~5
-31.7 22.5
7~
23.9
217
-20
-28.9
26.9
80
26.7
235
·15
-26.1
31.7
8~
21M
254
-10
-23.3
36.8
90
32.2
274
·5
.20.6
42.5
85
35.0
295
0
-17.8
46.6
100
37.8
317
5 -15.0
55,2
105
40.6
340
10
-12.2
62.3
110
433
385
15
-9.4
70,0
115
46.1
391
20
-6.7
78.3
120
48.9
418
25
-3.9
87.3
125
51.7
446
30
·1.1
96.8
130
54.4
416
35
1.7
107
135
57.2
507
40
4.4
118
140
60.0
539
45
7.2
130
145
62.6
573
50
10.0
142
150
85.8
608
S5
12.8
155
Page 26
H
'd
6H8
'ON
_.:e.~_
.'hl.'!JiL..
•.
41~
To Next Page
Loading...
