BulletinNo.
RANSG@
.l53.|039
O1AO22Dual
PRESSURECONTROL
CONVERTIBLE
SELECTOR
S6REW
RESET
LICATION
PTION/APP
DESCRI
BUrroN
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Rancodualpressurecontrolsare usedfor eitheroperating
andair conditioning
refrigeration
commercial
or protecting
systems.Within one NEMA I enclosure,they are a
combinationof both high and low pressurecontrols
to operatea commonswitch.
interconnected
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LADJUSTMENT
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RANGE
ADJUSTMENT
SCREWS
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DIFFERENTIAL
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Rancodual pressurecontrolsare suitablelor R12, R22,
and are availablewith eithermale
and R5O2refrigerants
flareor capillarywithflarenut pressureconnections.
The 012,witha singlepole,singlethrowswitch(SPST),
the 012
will directlycontrola singlephasecompressor;
pilot
control
of
single
contactorfor
with
a
used
mayalsobe
and three-phasecompressors.The 022, with a double
pole,singlethrowswitch(DPST),willdirectlycontrolsingle
The electricalratings inside
or three-phasecompressors.
exceeded.
not
be
must
cover
the control
INSTALLATION
The low pressurecloses(cuts-in)the switchon nse of
compressorsuctionpressureand opens (cuts-out)the
switchon pressuredrop. The high pressurefunction
discharge
to opentheswitchas thecompressor
overrides
pressurerises.See page3 for ControlAdjustments.
CAUTION
To prevent possible electricalshock or equipment
damage, disconnect electrical power to unit before
and during installation.DO NOT restore electrical
power to unit until the control is properly installed
and grounded. DO NOT locate the control in an
expfosive atmosphere as a safety hazard can result
due to possible spark generation in the control.
T h r e e v e r s i o n so f s w i t c h o p e r a t i o na r e a v a i l a b l e :
automaticon both low and high pressure;manualreset
on both low and high pressure;and convertible(manual
or automatic)on high pressurewith automaticon low
pressure.The converlibleresetfeatureallowsthe high
pressureside to be changedfrom manualto automatic
resetby merelyturningthe selectorscrew.
Controlsare not to be located in areas of extreme
moisture,dirt or dust, or in a corrosiveor explosive
can shortencontrollife.
Theseenvironments
atmosphere.
IMPORTANTNOTICE
(trippingswitch)
MANUALOPERATION
The switchcan be manuallyclosedby liftingthe bellowstab on the low pressureside,
providedthat the systemhighpressureis belowthe high pressurecut-in.Cycltlg-thecontrol
at any other pointWILL CAUSE CONTROLDAMAGEAND VOIDSWARRANTY.
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CONTROLBODY MOUNTING
It is importantnotto twistor strainthe controlbodyas shifting
of the calibration
mayresult.
Prelgrred
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RANCOdualpressure
controls
canbemounted
inanyposition,
eithervertically
or horizontally,
withoutaffecting
performance.
Thecontrolcan
bemounted
onanexisting
bracket,
ontheangle
bracketprovided,
or canbe flush-mounted
withouta bracket.
Nootherholesareto be cutor drilledin thecontrolframe.
1. Secure
thecontrol
to eitheranexisting
bracket
ortheangle
bracketprovided
by usingat leasttwoof thetappedholes
inthebackofthecontrol
withthe10-32x3/16screws..
lf other mountingscrewsare used,they must not
protrudeinto the control more than 1/8,'to avoid
damage.
2. Whenusingtheanglebracket,
thecontrolcan
bemounted
to the compressor
or any flat surfaceby usingtwo or
moreof the fourslottedholesin the baseof the anote
bracket.
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and brokencapillariescan result.Breakagecan be prevented
by properinstallationpractices.
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Altornats
No
When the control is mounted directly on the
c 0 m p r e s s o rt,h e c a p i l l a r ym u s t b e s e c u r e dt o t h e
compressorso that everythingmovestogether.lf the
c a p i l l a r yo r c o n t r o li s s h a k i n go r v i b r a t i n ga g a i n s t
t h e c o m p r e s s o rv i b r a t i o n ,w o r k - h a r d e n i n o
gf t h e
c a p i l l a r ym a y o c c u r , l e a d i n g t o e v e n t u a lf a i l u r e .
NOTE:The controlalsocan be flushmountedwithout
thebracketby usingthe.20inchholesinthebackof the
controlframe.Accesscan be gainedby removing
the
frontcoverandsecuring
thecontrolbodyto a wallor any
flat surface.
Mounting
to an unevensurfacemaycause
improper
controloperation.
CAPILLARYCARE AND MOUNTING
Compressors
vibrate.
Copper
work-ha
rdensandfractu
reswhen
L.P
COMPRESSOF MOUNTING
'
'o S u c l r o
t/
Compressor
ll ln s enEtn ts
acrs than 18'€p.
tube should b€ se6' :t iin,rg
1. Minimizethe numberof timesthe capillary
is bent.Each
t i m e i t i s r e b e n t , i t w o r k - h a r d e n sm a k i n g i t m o r e
susceptibleto breakage.
2. Avoidsharp bends,kinks,strainsor pinchmarks in the
capillary.Neverallowthe capillaryto restagainstsharp
edges or rub againstmetal sudaceswhere it can be
damagedby friction.
3. The capillaryshould be straightwithin4 inchesof the
pressureconnectionso the pulsationsdo not workhardenthe capillary.
4. Purge all tubingand lines beforeconnectingpressure
controls.
5. Route the capillaryso that it will be self-draining
to
minimizeoillogging.
Coils can be
taped or ti€d
M i n .o t 2 C o i l s2 t o 3 l n c h e sn D i a .C o i l s
W h e n t h e c o n t r o l b o d y i s m o u n t e dr e m o t e f r o m
t h e c o m p r e s s o ar n d t h e p r e s s u r ec o n n e c t i o n sa r e
o n t h e c o m p r e s s o ra, v i b r a t i o nc o i l m u s t b e u s e d
b e t w e e nt h e c o m p r e s s oar n d t h e m o u n t e dc o n t r o l .
T h e c a p i l l a r yb e t w e e nt h e p r e s s u r ec o n n e c t i o na n d
the vibration
coil shouldbe securedto the compressor.
REMOTEMOUNTING
1r'to18'
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Cornpressor
INSTRUCTION
SHEET1531039
Min. of 2 Coils
2 lo 3 inchos in
Diametsr Coils
6', ths tubing
should b€
clamp€d as
shom below
Thecapillary
between
thevibration
coilandthecontrol
bodyshouldbe securedto a stationary
memberwhen
thatdistanceexceeds6 inches.
FEMOTEMOUNTING
Min. ol2 Coils
2 to 3lnches in Dia
Coils
CONTROL
ADJUSTMENTS
Controlsettings
areto be as specified
by the equipment
manufacturer
andas required
for theapplication.
DO NOT
adjustthepointers
beyondthe highestor lowestmarkson the
scaleplate.
Thescaleplate
is onlyfor reference
andthefinal
controlsettings
shouldbe verifiedwitha gaugeset.
As a finalcheck,
thesystemshouldbe runthroughseveral
cyclesto assurepropersettings
andinstallation.
LOWPRESSURE
SIDE(cut-inon rise)
Compressor
The cut-outsettingshouldneverbe lowerthan 18 to 20 inches
of vacuumon R12 and singlestageR22 and R502systems
shouldneverbe set lowerthan 0 PSIGto 3 inchesof vacuum.
Excessivelylow settingscan causecompressordamage.
2 or MoreCoilsOf TubingOn
CompressorSide ol Clamp
8. Coil and secureany excesscapillaryto avoid
possibledamagedueto vibration.
Capillary
coils
shouldbe no lessthan2 inchesin diameter(3
inchesis recommended).
Wheneverpossrble,
inserta sectionof rubberpipeinsulation
intothe
coilsto absorbvibration.
9. Althoughcoilingand securingthe excess
capillaryis importantto dampenthe effectsof
vibration,it is just as importantto allowenough
slackin the capillaryso that it is not taut like a
"banjostring".
10. On startupof the equipment,observethe
capillaryfor excessivevibrationand make
correctionsas reouired.
2. Allelectricalwiring
shouldconformto the Natlonal
Electrical
Codeand localregulations.
3. The electricalratingsinsidethe controlcovermust
not be exceeded.
4. Whenmountinga conduitconnectorto the control
frame, care is to be taken so that the control
m e c h a n i s mo r t h e h i n g ep i n i s n o t d a m a g e d
duringinstallation.
5. Attach electricalleads to the switch terminals
usingthe screwsprovided.The terminalsmust
notbe bent,cut off, drilledor retapped.
Electrical
leadsmustnot be taut:slackmustbe allowedfor
temperature
changeand vibration.
The terminal
configurations
are shownbelow.
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1. Adjustthe low pressurerangescrew untilthe scale
pointerindicatesthe desiredcut-in. Turningthe range
screwclockwiselowersboththe cut-in and the cut-out:
counterclockwise
raisesboth.
2. Adjustthe differential
screwuntilthe scalepointer
indicates
the desireddifferential.Turningthe
differential
screw clockwiseincreasesthe differential:
counterclockwise
decreases.
The cut-outis calculatedby subtractingthe differential
from the cut-insetting.20" of vacuumis the lowest
attainable
cut-out.
CONTROL WIRING
powerto the unit.
1. Disconnect
electrical
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NOTE:A controlwith manualreseton the low side has a
scaleplatethat directlyindicatesthe cut-outand has a fixed
differential
of approximately10 PSl.A controlwith automatic
reseton the low side,has a scaleplatethat directlyindicates
the cut-in and differential (differencebetweencut-inand cutout).The cut-outis calculatedas follows:
t
t,ri-!
O(AlvlPLE:
Cut-ln
c|iff.refidal Cut€rJt
=
t6
:16
20
ctottt 0t ttttt|'rt
**"Hli
rTro -
Er
Cut-ln
l:15
a o /l ,6a c " 8- - . 1
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LOWPRESSURE
CUT-OUT
CHECK
Thelowpressure
sidecanbe precalibrated
by usinga
conlainer
of refrigerant
anda gaugeset.Usea continuity
meterto indicate
theclosingandopeningof theswitch.
Adjust
thecontrolto thedesiredsettings;
pressurize
thecontrolwhile
adjusting
thesettings.
Lowpressure
settings
canbe rechecked
whentheunitis
runningby connecting
a gaugeto thesuctionlineservice
valve.Closethe liquidlinevalveandallowthesystemto pump
down,observing
thecut-outpoint.Thenopentheliquidline
valveandallowthepressure
to increase,
observing
thecut-in
point.Adjustthesettings
as necessary.
I
A
INSTRUCTION
SHEET1531039
MANUALRESET
the control,the causeof the abnormal
Beforeresetting
pressure
Controls
andcorrected.
shouldbe determined
equippedwith a manualresetfeaturecan be resetby
before
theresetbaror resetbutton.However,
depressing
mustdrop50thecontrolcanbe reset,thehighpressure
lf thecontrolis a manual
60 psibelowthecontrolcut-out.
mustriseapproximately
resetonthelowside,thepressure
10 psiabovethecontrolcut-out.
SIDE(cut-out on rise)
HlcHPRESSURE
of 50
functionhasa fixeddifferential
Thehighpressure
uponthecontrolmodel.Thismeans
or 60 psidepending
must
thatin orderfor the controlto reset,the pressure
drop50-60psibelowthecut-out.
withhighpressure
areequipped
NOTE:Somecontrols
limitstops.Althoughthe highpressurerangecan be
adjusted,the factoryset limitstoppreventsadjustment
higherthanthe limitstopseiling.DO NOTattemptto
beyondthe limitstopsetting.
forcetheadjustment
CONVERTIBLE(Manual/Automatic)RESET
witha manual/
areequipped
controls
Manydualfunction
The reset
for highpressure.
resetcapability
automatic
screwatop
theselector
by positioning
function
isselected
for manualreset,or downfor
thecontrolin an up position
the nut
reset. Afterthe screwis positioned,
automatic
mustbe relocked.
Adjustthe highpressurerangescrewuntilthe scale
pointerindicates
Turning
the
thedesiredcut-outsetting.
cut-out;
counterclockwise
lowers
the
clockwise
screw
raises.
HIGHPRESSURECUT.OUTCHECK
T h e h i g h p r e s s u r ec u t - o u tc a n b e c h e c k e db y
the air flowon air
thefan or by blocking
disconnecting
reduce
Onwatercooledcondensers,
cooledcondensers.
thecut-outand
or shutoftthewaterflowwhileobserving
Thesechecksmustbe
CAUTION:
adjustas required.
for a brieftimeonly.
Low Pressure
Range
psrc
Difrerential
pqI
I
Range
PS I (]
100to 250
12"to 50
50
Fixed
5to35
l0 to 40
Prxsrrrp
Automatlc
150to 450
60
Fixed
60
Fixed
ol2
o22
SPS-I
DPST
-16"
, CaPillan
Hishl\lale1*ithl*ith
Prxsrrm
I
Flerc | Flarc\rrt
- - \ u l .t : t l [ t
o 1l I-505
1
JE"
CaPillary'
36"
Capillar.v
with
I
FlareNut
Flerp Nrrl
o l r - r 5 0 6| , , , , ' r r ,
,\uto/|VIan**
Automatic
150to 450
10"to lfi)
Low
Differential
PSI
I
Reset
High Pressure
Automatrc
022-1102
CLrnvcrtible)
Aui.,rnrll
or2-r502
AutoA{rn'*
Automatic t C o n r c n i btl c
Automatlc
Automatic
Automatlc
Auto/Man**
tConvcrtible)
Manual*
\{anualx*
Oll ,tltl3
0 1 2 - r 5 5 0o l ] - r 5 - 1 9
o12-4834 o22-t106
otz-t594
I Locks open pressure decrease **Locks open on pFessur,eincrcase.
RANSG@CCINTFICILS
Wholesale& Replacement
PartsDivision
555LondonRoad
Delawar€,
Ohio43015
(614)876{022
Copyright1985,Rancolncorporated
All RightsReserved
Form#1531039