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Normal Shutdown to Stopped or Run
Inhibit
The following diagram shows the Transition from
Running through a Normal (friendly) Shutdown. The
Figure 57. Sequence of events: normal shutdown to stopped or run inhibit
L o c a l S to p
C h ille r L ev e l D ia g n o s tic – N o rm a l S h u td o w n L a tch e d
C h ille r L ev e l D ia g n o s tic – N o rm a l S h u td o w n N o n la tch ed
B u ild in g A u to m a tio n S y s te m S to p
E x te rn al A u to -S to p
6/12/2 0 12 - 8 /1 5/2 012
S h u ttin g D o w n
R u n n in g C ircu it M o d es: S h u ttin g D o w n
O n e o r
S u b M o d e : O p era tio n a l P u m p d o w n
M o re
C ircu its
O p eratio n al P u m p d o w n
(0 S e co n d s to 2 M in u te s)
R u n n in g
C lo se E X V
(0 to 25 S eco n d s)
6/ 13/ 2012
F u lly C lo se E X V
N o P u m p d o w n R e q u ire d
IF
*
P erfo rm O p e ra tio n al
P u m p d o w n
P u m p d o w n fo r A ll
R e q u ire d
R u n n in g C irc u its if
R eq u ire d
6/ 12/ 2012 - 12/ 11/ 2012
C h ec k fo r
6/1
1
1
5
5
5
5
/
/
/
/
2
2
2
2
2
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
N o rm a l P u m p d o w n
T erm in atio n C rite ria M et
*
N o te : O p eratio n al P u m p d o w n is req u ired if th e O u td o o r A ir T em p era tu re is le ss th a n 5 0 F .
**
N o te : O p eratio n al P u m p d o w n is T erm in ate d N o rm ally w h en th e E vap o ra to r R e frig e ran t
P ress u re is a t o r b elo w 20 P S IA .
T h e M a xim u m A llo w ed T im e fo r O p eratio n al P u m p d o w n is 2 M in u tes.
AC-SVX001A-EN
N o rm al P u m p d o w n T erm in a tio n
C riteria is M et fo r A ll C ircu its
r
r
i
i
a
a
a
a
i
i
s
s
s
s
M
M
M
M
8
/
1
5
/
2
0
1
S h u ttin g D o w n
C ircu it M o d es :
*
E vap o rato r P u m p O ff D elay
(A d ju stab le 1 to 30 M in u tes)
8/ 15/ 2012
S en d S to p C o m m an d to
A ll
R u n n in g C o m p resso rs
E n erg ize A ll H eaters
F u lly C lo se B o th E X V s
*
T u rn O ff A ll R u n n in g
C ircu its C o n d en se r F an s
0
0
12
**
dashed lines on the top attempt to show the final mode
if stop is selected via various inputs.
**
e
e
t
t
f
f
o
o
r
r
A
A
A
A
l
l
l
l
C
C
C
C
i
i
2
-
1
0
/
1
/
2
0
2
10 /16 /20 12 - 1 2/1 1/2 012
S to p p ed o r R u n In h ib it
C irc u it M o d es :
A u to
S to p p e d o r A u to
D e -E n erg ize E vap o ra to r
W ater P u m p R elay
10/ 17/
2012
2
*Note: Operational Pumpdown is required if the
Outdoor Air Temperature is less than 50°F.
** Note: Operational Pumpdown is terminated
normally when the Evaporator Refrigerant Pressure
is at or below 20 psia.
The Maximum Allowed time for Operational Pumpdown
is 2 minutes.
S S t t a a r r t t - - u u p p a a n n d d S S h h u u t t d d o o w w n n
S to p p e d
o r
R u n In h ib it
12/ 11/ 2012
75
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