Danfoss Performer SH090, Application Manuallines

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25 FR CC .P C . 007 .B8. 02
Application guidelines Operating conditions
F or SH 0 9 0 to 3 8 0 , DGT prote c tion is re qu ired i f
t h e h ig h and l o w press u re s w it ch settings do
not prote c t t h e c ompressor against operations
b e y ond its spe c i fi c app l i c ation en v e l ope . Pl ease
re f er to t h e e x amp l es b e l o w, wh i ch i llu strate
wh ere DGT prote c tion is re qu ired (Ex.1 ) and
wh ere it is not (Ex. 2) .
A dis ch arge gas temperat u re prote c tion de v i c e
m u st b e insta ll ed on a ll h eat p u mps . I n re v ersi bl e
air - to - air and air - to -w ater h eat p u mps t h e
dis ch arge temperat u re m u st b e monitored
d u ring de v e l opment test by t h e e qu ipment
man uf a c t u rer .
Th e dis ch arge gas t h ermostat a cc essor y k it (c ode
775000 9 ) in clu des a ll c omponents re qu ired f or
insta ll ation as s h o w n b e l o w. Th e t h ermostat m u st
b e atta ch ed to t h e dis ch arge l ine w it h in 1 50 mm
f rom t h e c ompressor dis ch arge port and m u st b e
t h erma lly ins ul ated and tig h t ly fi x ed on t h e pipe .
Th e DGT s h o ul d b e set to open at a dis ch arge gas
temperat u re o f 1 35°C .
Th e c ompressor m u st not b e a ll o w ed to cycl e
on t h e dis ch arge gas t h ermostat . Contin u o u s
operations b e y ond t h e c ompressor ’ s operating
range w i ll c a u se serio u s damage to t h e
c ompressor !
A h ig h- press u re (HP ) sa f et y s w it ch is re qu ired to
s hu t do w n t h e c ompressor s h o ul d t h e dis ch arge
press u re e xc eed t h e v a lu es s h o w n in t h e ta bl e
se c tion "Sy stem press u re test ". Th e h ig h- press u re
s w it ch c an b e set to l o w er v a lu es depending on
t h e app l i c ation and am b ient c onditions . Th e HP
s w it ch m u st eit h er b e p l a c ed in a l o ck o u t c ir cu it
or c onsist o f a man u a l reset de v i c e to pre v ent
cycl ing aro u nd t h e h ig h- press u re l imit . If a
dis ch arge v a lv e is u sed , t h e HP s w it ch m u st b e
c onne c ted to t h e ser v i c e v a lv e ga u ge port , wh i ch
m u st not b e iso l ated .
H igh and low pressure
protection
H igh pressure
Th e dis ch arge gas temperat u re m u st not e xc eed
1 35°C .
SH48 5 in clu des a PT C sensor l o c ated in t h e
fi x ed s c ro ll and w ired in series w it h t h e motor
PT C t h ermistor ch ain . Exc essi v e dis ch arge
temperat u re w i ll res ul t in e l e c troni c mod ul e
o u tp u t re l a y to trip .
Discharge temperature
protection
Ex amp l e 1 (R41 0 A, SH = 11 K )
LP s w it ch setting :
LP1 = 3 . 3 b ar ( g) (-1 5 . 5°C)
HP s w it ch setting :
HP1 = 3 8 b ar ( g) (6 2°C)
R is k o f operation b e y ond t h e app l i c a -
tion en v e l ope .
DGT prote c tion re qu ired .
Ex amp l e 2 (R41 0 A, SH = 11 K )
LP s w it ch setting :
LP 2 = 4.6 b ar ( g) (-1 0 . 5°C)
HP s w it ch setting :
HP 2 = 3 1 b ar ( g) ( 52°C)
N o ris k o f operation b e y ond t h e
app l i c ation en v e l ope .
N o DGT prote c tion re qu ired .
70
6 5
6 0
55
50
4 5
4 0
35
30
25
20
1 5
1 0
- 30 - 25 - 20 -1 5
-1 0
- 5 0 5 1 0 1 5 20
C
ond
.
temp
. (
°C
)
Ev ap . temp . ( °C)
LP1
HP 2
HP1
R41 0 A
DGT - l
imit
Example 1
Example 2
LP 2
D is ch arge line
Insulation
B ra ck et
T h ermostat