Dodge Sprinter 2006 Manual page 2064

24 - 32 CONTROLS - REAR
A / C LOW PRESSU RE SWI T CH
DESCRIPTION
Th e r ea r A/C low pr essu r e swit ch pr ovides a sign a l
t o t h e r ea r A/C con t r ol m odu le t o r egu la t e t h e r ea r
r efr iger a n t syst em pr essu r e a n d con t r ol r ea r A/C
eva por a t or t em per a t u r e (F ig. 9). Th e r ea r A/C con t r ol
m odu le will disen ga ge t h e r ea r A/C clu t ch if t h e r ea r
r efr iger a n t syst em su ct ion lin e pr essu r e fa lls below
30 kP a (4.4 psi).
Th e r ea r A/C low pr essu r e swit ch is m ou n t ed on a
fit t in g loca t ed on t h e r ea r su ct ion lin e n ea r t h e left
side of t h e r ea r A/C eva por a t or h ou sin g.
Th e r ea r r efr iger a n t syst em m u st be disch a r ge
pr ior t o r em ovin g t h e r ea r A/C low pr essu r e swit ch .
Fig. 9 Rear A/C Low Pressure Switch
1 - REAR PRESSURE SWITCH
2 - WIRE CONNECTOR
OPERA TION
Th e r ea r A/C low pr essu r e swit ch is elect r ica lly
con n ect ed in ser ies wit h t h e r ea r A/C h igh pr essu r e
swit ch , bet ween gr ou n d a n d t h e r ea r A/C con t r ol
m odu le.
Th e r ea r A/C low pr essu r e swit ch con t a ct open s or
closes t h e pa t h t h e gr ou n d, sign a lin g t h e r ea r A/C
con t r ol m odu le t o t u r n t h e r ea r A/C clu t ch on a n d off.
Th is r egu la t es t h e r ea r r efr iger a n t syst em pr essu r e
a n d con t r ols r ea r A/C eva por a t or t em per a t u r e. Con -
t r ollin g t h e r ea r eva por a t or t em per a t u r e pr even t s
con den sa t e wa t er on t h e eva por a t or fin s fr om fr eez-
in g a n d obst r u ct in g r ea r A/C syst em a ir flow.
Th e r ea r A/C low pr essu r e swit ch con t a ct s a r e open
wh en t h e r ea r su ct ion lin e pr essu r e is a ppr oxim a t ely
152 kP a (22 psi) or lower. Th e r ea r A/C low pr essu r e
swit ch con t a ct s will close wh en t h e r ea r su ct ion lin e
pr essu r e r ises t o a ppr oxim a t ely 234 t o 262 kP a (34 t o
38 psi) or a bove. Lower a m bien t t em per a t u r es, below
a ppr oxim a t ely -1° C (30° F ), will a lso ca u se t h e r ea r
A/C low pr essu r e swit ch con t a ct s t o open du e t o t h e
pr essu r e/t em per a t u r e r ela t ion sh ip of t h e r efr iger a n t
in t h e syst em .
Th e r ea r A/C low pr essu r e swit ch is fa ct or y-ca li-
br a t ed a n d ca n n ot be a dju st ed or r epa ir ed a n d, if
fa u lt y or da m a ged, it m u st be r epla ced. Refer t o t h e
a ppr opr ia t e wir in g in for m a t ion for com plet e H VAC
wir in g dia gr a m s.
REMOVAL
WARNING: Refer to the applicable warnings and
cautions for this system before performing the fol-
lowing operation (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING - WARNINGS) and (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMBING -
CAUTIONS). Failure to follow the warnings and cau-
tions could result in possible personal injury or
death.
(1) Discon n ect a n d isola t e t h e n ega t ive ba t t er y
ca ble.
(2) Rem ove t h e cover fr om t h e r ea r A/C eva por a t or
h ou sin g (Refer t o 24 - H E ATING & AIR CONDI-
TIONING/DISTRIBUTION - RE AR/A/C E VAP ORA-
TOR COVE R-RE AR - RE MOVAL).
(3) Recover t h e r efr iger a n t fr om t h e r ea r r efr iger-
a n t syst em (Refer t o 24 - H E ATING & AIR CONDI-
TIONING/P LUMBING - STANDARD P ROCE DURE -
RE F RIGE RANT RE COVE RY).
(4) Rem ove t h e in su la t in g t a pe fr om a r ou n d t h e
a r ea of t h e r ea r A/C low pr essu r e swit ch (F ig. 10).
(5) Discon n ect t h e wir e h a r n ess con n ect or fr om t h e
r ea r A/C low pr essu r e swit ch .
(6) Rem ove t h e r ea r A/C low pr essu r e swit ch a n d
in st a ll a plu g in t o, or t a pe over t h e open ed r ea r su c-
t ion lin e fit t in g.
VA