Trane Ascend ACR Series User Manual

72
AC-SVX001A-EN
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)
*Note: The decision to stage on or off another com pressor is determ ined by
the Average Running Com pressor Load Command, W ater Tem perature Error, and Time Since Last Stage
H o ld E X V P re -p o s ition
(10 S eco n d s )
Lea d
C om p resso r
R un n in g
C hille r and Lead C irc uit
M o de is “R u n n in g ” - Lag
C irc u it M o d e is “ A u to ”
H o ld E X V o f L e ad
C irc u it a t p re -
positio n for 1 0 s ec
D e-energiz e
O il H eate rs
O f Lea d C irc uit
C o n tro l L e ad C ircu it
C o n d ense r Fan s for
O p tim u m Differential
P re ssu re,
ƒ(C p rs r S p d , O A T em p )
6
6
/
/
/
1
1
1
2
2
2
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
-
1
1
1
2
2
2
/
/
/
1
1
1
1
1
1
/
/
/
2
2
2
0
0
0
1
1
1
2
2
2
E n fo rc e A ll R u n n in g M od e D iag n o s tics for C h iller, L e a d C o m p ressor an d its C ircuit
M o d u la te E X V fo r
Liquid Leve l &
P re ssu re C o n tro l
M o d u la te
C o m p re ssor
S peed fo r
Lim it C o n tro l
M o d u la te C o m pre s sor
S peed fo r
C apacity C o n tro l
M o d u la te C o m pre s sor
S peed fo r
C apacity C o n tro l
6
6
6
6
/
/
/
/
1
1
1
1
2
2
2
2
/
/
/
/
2
2
2
2
0
0
0
0
1
1
1
1
2
2
2
2
-
-
-
7
7
7
7
/
/
/
/
2
2
2
2
4
4
4
4
/
/
/
/
2
2
2
2
0
0
0
0
1
1
1
1
2
2
2
2
R u n n in g
6
/
1
3
/
/
2
0
1
2
7
7
7
7
/
/
/
/
/
22
2
2
2
2
2
2
2
3
3
3
3
/
/
/
/
2
2
2
2
0
0
0
0
1
1
1
1
2
2
2
2
-
-
-
8
8
8
8
/
/
/
/
1
1
1
1
4
4
4
4
/
/
/
/
2
2
2
2
00
0
0
R u n n in g
7
/
2
4
/
/
2
0
1
2
8
8
/
/
1
4
/
/
2
0
0
1
2
-
9
9
/
/
1
1
/
/
2
0
0
1
2
R u n n in g
Lea d C ircuit:
R un n in g L im it
8
/
1
5
/
/
2
0
1
2
6
/
1
1
1
1
1
1
3
3
3
/
/
/
/
22
2
2
2
2
2
00
0
0
0
0
0
0
0
0
0
11
1
1
1
1
1
1
122
2
2
2
2
2
2
2
M
i
l
e
s
t
o
n
n
n
n
n
n
e
e
e
D
D
D
e
e
eee
e
e
e
e
s
s
s
s
s
s
c
c
c
c
c
r
r
r
r
r
ii
i
i
i
i
i
p
p
p
p
p
p
tt
t
t
t
t
t
ii
i
i
i
i
i
o
o
o
o
o
n
n
n
n
n
9
9
9
9
/
/
/
/
1
1
1
1
0
0
0
0
/
/
/
/
2
2
2
2
0
0
0
0
1
1
1
1
2
2
2
2
-
-
-
1
1
1
1
0
0
0
0
/
/
/
/
2
2
2
2
9
9
9
9
/
/
/
/
2
2
2
2
0
0
0
0
1
1
1
1
2
2
2
2
R u n n in g
9
r
/
/
/
1
1
/
/
2
0
1
2
E x it
Lim it M o d e
E n te r
Lim it M o d e
S tage O n
S e tpo in t M e t*
1
0
0
/
/
2
8
8
/
/
2
0
0
1
2
-
1
2
/
/
1
1
/
/
2
0
0
1
2
R u n n in g
Lag C ircuit:
W aitin g to S tart
1
1
1
r
0
0
0
/
2
9
/
2
0
1
2
P re p are to S tart
Lag C o m p re s sor,
C h eck for O il,
C h eck for L P C
E X V m ov in g to prepositio n
0 to 2 5 S e c o nds
S tart C ontro l o f
C o n d ense r Fan F low
on L ag C ircu it
S end S ta rt C o m m and
to L a g C om presso r
C on tinu e
R un n in g
P re -P o sition E X V of
Lag C irc u it
1
2
/
1
1
/
/
2
0
1
2
SSttaarrtt--uupp aanndd SShhuuttddoowwnn

Trane Ascend ACR Series Specifications

General

Brand	Trane
Model	Ascend ACR Series
Category	Chiller
Language	English