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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
Running (Lead Compressor/Circuit Start
and Run)
The following diagram shows a typical start and run
sequence for the lead compressor and its circuit.
Figure 54. Sequence of operation: running (lead compressor/circuit start and run)
C h iller a n d L ead C ircu it
M o d e is "R u n n in g " - L ag
C ircu it M o d e is "A u to "
6
6
6
6
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/
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-
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/
R u n n in g
L ea d
C o m p res so r
R u n n in g
H o ld E X V P re-p o sitio n
(10 S e co n d s )
6/ 13/
/
2012
H o ld E X V o f L ea d
C ircu it at p re -
p o sitio n fo r 10 se c
D e-en erg ize
O il H ea ters
O f L ead C irc u it
C o n tro l L ead C irc u it
C o n d en se r F a n s fo r
O p tim u m D ifferen tia l
P re ss u re,
ƒ(C p rsr S p d , O A T em p )
6/ 1
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2 2
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E n fo rce A ll R u n n in g M o d e D iag n o stics fo r C h ille r, L ea d C o m p re s s o r a n d its C irc u it
M ilest on
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o
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*N o te : T h e d ecis io n to stag e o n o r o ff an o th er co m p resso r is d eterm in e d b y
th e A v e rag e R u n n in g C o m p re sso r L o a d C o m m an d , W ater T em p eratu re E rro r, a n d T im e S in ce L a s t S ta g e
72
E n te r
L im it M o d e
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/
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1 4/
/
2 0
0
12 - 9
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R u n n in g
R u n n in g
L ead C ircu it:
R u n n in g L im it
8/ 15/
/
2012
M o d u late
C o m p res so r
7/ 24/
/
2012
S p eed fo r
L im it C o n tro l
M o d u late E X V fo r
L iq u id L eve l &
P ressu re C o n tro l
M o d u late C o m p res so r
S p eed fo r
C ap a city C o n tro l
6 6
E x it
L im it M o d e
9
/
/
11/
/
20
0
1 2
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R u n n in g
r
9
/
/
/
11/
/
2012
M o d u late C o m p resso r
S p eed fo r
C ap acity C o n tro l
P re-P o sitio n E X V o f
L ag C ircu it
P rep are to S tart
L ag C o m p resso r,
C h eck fo r O il,
C h eck fo r L P C
/ /
/
1 1
1
2 2
2
/ /
/
2 2
2
0 0
0
1
1 1
2 2
2
- 1
1 1
2 2
2
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1
1 1
1 1
1
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2 2
2
0
0 0
1 1
1
2 2
2
S ta g e O n
S e tp o in t M e t*
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0
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2 8
8
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2 0
0
12 - 12/
/
11/
/
20
0
12
2
2
2
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R u n n in g
L a g C irc u it:
W a itin g to S ta rt
E X V m o vin g to p rep o sitio n
0 to 25 S eco n d s
1
1
1
0
0
0
/ 29/ 2012
r
12/ 11/
/
2012
S tart C o n tro l o f
C o n d en ser F an F lo w
o n L ag C ircu it
S en d S tart C o m m an d
to L ag C o m p resso r
C o n tin u e
R u n n in g
AC-SVX001A-EN
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