Danfoss Performer SH090, Application Manuallines

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42 F R CC.PC.007.B 8 .02
Application guidelines Installation
P ress u ri z e the s y stem on HP si d e fi rst then LP si d e
to p re v ent rotation o f the scro ll. Ne v er l et the
p ress u re on LP si d e e x cee d the p ress u re on HP
si d e with more than 5 bar .
O n S H1 8 0-240-29 5 -300-3 8 0-4 85 mo d e l s which
ha v e an interna l non ret u rn v a lv e in d ischarge
fi tting or i f an e x terna l non ret u rn v a lv e is p resent
on the d ischarge l ine , we a dv ise to p ress u ri z e
the s y stem not qu icker than 4. 8 bar / s to a ll ow
p ress u re e qu a l i z ation between LP an d HP si d e
o v er scro ll e l ements .
L eak d etection m u st be carrie d o u t u sing a
mi x t u re o f nitrogen an d re f rigerant or nitrogen
an d he l i u m , as in d icate d in the tab l e be l ow .
Ne v er u se other gasses s u ch as o xy gen , d r y air
or acet yl ene as these ma y f orm an in fl ammab l e
mi x t u re .
P ress u ri z e the s y stem on HP si d e fi rst then LP
si d e .
Moist u re obstr u cts the p ro p er fu nctioning o f the
com p ressor an d the re f rigeration s y stem .
A ir an d moist u re re du ce ser v ice l i f e an d increase
con d ensing p ress u re , an d ca u se e x cessi v e ly high
d ischarge tem p erat u res , which can d estro y the
lu bricating p ro p erties o f the oi l. A ir an d moist u re
a l so increase the risk o f aci d f ormation , gi v ing
rise to co pp er pl atting . All these p henomena
can ca u se mechanica l an d e l ectrica l com p ressor
f ai lu re .
F or these reasons it ’ s im p ortant to p er f orm a
v ac uu m d eh yd ration on the s y stem to remo v e
a ll resi du a l moist u re f rom the p i p e - work a f ter
assemb ly;
S H com p ressors are d e l i v ere d with < 100 pp m
moist u re l e v e l. T he re qu ire d moist u re l e v e l in the
circ u it a f ter v ac uu m d eh yd ration m u st be < 100
pp m f or s y stems with an S H.
• Ne v er u se the com p ressor to e v ac u ate the
s y stem .
• C onnect a v ac uu m pu m p to both the LP & HP
si d es .
• Ev ac u ate the s y stem to a p ress u re o f 5 00 μ m
H g (0.67 mbar ) abso lu te .
D o not u se a megohm meter nor a pply p ower to
the com p ressor whi l e it ’ s u n d er v ac uu m as this
ma y ca u se interna l d amage .
Leak detection
Vacuum evacuation and
moisture removal
Filter driers
A p ro p er ly si z e d & t yp e o f d rier is re qu ire d.
I m p ortant se l ection criteria inc lud e the d riers
water content ca p acit y, the s y stem re f rigeration
ca p acit y an d the s y stem re f rigerant charge .
T he d rier m u st be ab l e to reach an d maintain
a moist u re l e v e l o f 5 0 pp m en d p oint d r y ness
(EPD).
F or new insta ll ations with S H com p ressors with
p o ly o l ester oi l, D an f oss recommen d s u sing the
D an f oss D M L (100% mo l ec ul ar sie v e ) so l i d core
fi l ter d rier . Mo l ec ul ar sie v e fi l ter d riers with l oose
bea d s f rom thir d p art y s uppl iers sha ll be a v oi d e d.
F or ser v icing o f e x isting insta ll ations where aci d
f ormation is p resent the D an f oss DCL ( so l i d core )
fi l ter d riers containing acti v ate d a lu mina are
recommen d e d.
T he d rier is to be o v ersi z e d rather than u n d er
si z e d. W hen se l ecting a d rier , a l wa y s take into
acco u nt its ca p acit y ( water content ca p acit y),
the s y stem re f rigeration ca p acit y an d the s y stem
re f rigerant charge .
Af ter b u rn o u t , remo v e & re pl ace the l i qu i d l ine
fi l ter d rier an d insta ll a D an f oss t yp e DA S b u rn -
o u t d rier o f the a pp ro p riate ca p acit y. Re f er to the
DA S d rier instr u ctions an d technica l in f ormation
f or correct u se o f the b u rno u t d rier on the l i qu i d
l ine .
L eak d etection with re f rigerant L eak d etection with a mass s p ectrometer
Nitrogen & R 410A Nitrogen & H e l i u m
Note 1: L eak d etection with re f rigerant ma y be f orbi dd en in some co u ntries . C heck l oca l reg ul ations .
Note 2: T he u se o f l eak d etecting a dd iti v es is not recommen d e d as the y ma y a ff ect the lu bricant p ro p erties .