AC-SVX001A-EN
75
Normal Shutdown to Stopped or Run
Inhibit
The following diagram shows the Transition from
Running through a Normal (friendly) Shutdown. The
dashed lines on the top attempt to show the final mode
if stop is selected via various inputs.
Figure 57.
Sequence of events: normal shutdown to stopped or run inhibit
*
N o te : O p e r a tio n a l P u m p d o w n is r e q u ir e d if th e O u td o o r A ir T e m p e r a tu r e is le s s th a n 5 0 F .
* *
N o te : O p e r a tio n a l P u m p d o w n is T e r m in a te d N o r m a lly w h e n th e E v a p o r a to r R e fr ig e r a n t
P r e s s u r e is a t o r b e lo w 2 0 P S IA .
T h e M a x im u m A llo w e d T im e fo r O p e r a tio n a l P u m p d o w n is 2 M in u te s .
6 /1 2 /2 0 1 2 - 8 /1 5 /2 0 1 2
S h u ttin g D o w n
R u n n in g C irc u it M o d e s : S h u ttin g D o w n
S u b M o d e : O p e ra tio n a l P u m p d o w n
*
8/ 15/ 2012
12/ 11/ 2012
6/ 13/ 2012
O p e ra tio n a l P u m p d o w n
(0 S e c o n d s to 2 M in u te s )
F u lly C lo s e E X V
P e rfo rm O p e ra tio n a l
P u m p d o w n fo r A ll
R u n n in g C irc u its if
R e q u ire d
*
IF
*
C lo s e E X V
(0 to 2 5 S e c o n d s )
0
0
1 2
6/ 12/ 2012 - 12/ 11/ 2012
C h e c k fo r
N o rm a l P u m p d o w n
T e rm in a tio n C rite ria M e t
**
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 P u m p d o w n R e q u ire d
P u m p d o w n
R e q u ire d
E v a p o ra to r P u m p O ff D e la y
(A d ju s ta b le 1 to 3 0 M in u te s )
S e n d S to p C o m m a n d to
A ll
R u n n in g C o m p re s s o rs
E n e rg ize A ll H e a te rs
F u lly C lo s e B o th E X V s
T u rn O ff A ll R u n n in g
C irc u its C o n d e n s e r F a n s
D e -E n e rg ize E v a p o ra to r
W a te r P u m p R e la y
S to p p e d
o r
R u n In h ib it
O n e o r
M o re
C irc u its
R u n n in g
N o rm a l P u m p d o w n T e rm in a tio n
**
C rite ria is M e t fo r A ll C irc u its
L o c a l S to p
C h ille r L e v e l D ia g n o s tic – N o rm a l S h u td o w n L a tc h e d
C h ille r L e v 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 tc h e d
B u ild in g A u to m a tio n S y s te m S to p
E x te rn a l A u to -S to p
8
r
r
i
i
/
a
a
1
a
a
5
i
i
/
s
s
2
s
s
0
M
M
1
M
M
2
e
e
-
t
t
1
f
f
0
o
o
/
r
r
1
A
A
/
A
A
2
l
l
l
l
0
C
C
C
C
2
i
i
S h u ttin g D o w n
C irc u it M o d e s :
A u to
1 0 /1 6 /2 0 1 2 - 1 2 /1 1 /2 0 1 2
S to p p e d o r R u n In h ib it
C irc u it M o d e s :
S to p p e d o r A u to
10/ 17/ 201
2
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.
Содержание Ascend ACR Series
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