Trane Ascend ACR Series - Running; Start and Run)

AC-SVX001A-EN
73
Running (Lag Compressor/Circuit Start
and Run)
The following diagram shows a typical start and run
sequence for the lag compressor and its circuit.
Figure 55. Sequence of operation: running (lag 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 )
B oth
C om p resso rs
R un n in g
C hille r and B o th C ircuit
M o des a re “ R u n n in g ”
H o ld E X V o f L a g
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 Lag C irc u it
C o n tro l B oth C ircuit
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
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
6/
/
/
/
/1
1
1
1
12
2
2
2
2/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2 -
-
-
7
7
7
7
7/
/
/
/
/2
2
2
2
24
4
4
4
4/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2
R u n n in g
6
/
1
3
/
/
2
0
1
2
7
7
7
7
7/
/
/
/
/
/
22
2
2
22
2
2
2
2
2
3
3
3
3
3/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2 -
-
-
8
8
8
8
8/
/
/
/
/1
1
1
1
14
4
4
4
4/
/
/
/
/2
2
2
2
2
R u n n in g
7
/
2
4
/
/
2
0
1
2
6
/
1
1
1
1
1
1
3
3
3
3
/
/
/
/2
2
2
2
2
2
2
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
12
2
2
2
2
2
2
2
M
i
l
e
s
t
o
n
n
n
n
n
ee
e
D
D
D
e
e
e
e
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
E x it
Lim it M o d e
E n te r
Lim it M o d e
1
1
1
1
10
0
0
0
0/
/
/
/
/2
2
2
2
28
8
8
8
8/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2 -
-
-
1
1
1
1
12
2
2
2
2/
/
/
/
/1
1
1
1
11
1
1
1
1/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2
R u n n in g
E nergize M axim u m
C apacity R elay a fte r th e
A d ju stab le F ilte r Tim e
(0 to 6 0 0 S e conds)
C on tinu e
R un n in g
(B o th
C om p rsrs
& M a x
C apa c ity
M a x im u m C a p a city
S ubm ode
/
/
/
/
/1
1
1
1
11
1
1
1
1/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2 -
-
-
1
1
1
1
10
0
0
0
0/
/
/
/
/3
3
3
3
30
0
0
0
0/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2
R u n n in g
8
/
/
1
3
3
/
/
2
0
0
1
2
-
9
9
/
/
1
1
/
/
2
0
0
0
1
1
1
2
R u n n in g
Lag C ircuit:
R un n in g L im it
9
/
1
1
/
/
2
0
1
2
8
/
1
3
/
/
2
0
1
2
1
1
1
o
0
0
0
r
/
/
/
3
0
/
/
2
0
1
2
2
2
B oth C o m presso rs R u nn ing
A t o r N ear M ax Sp e ed
(U n a b le to A chie v e C W SP )
SSttaarrtt--uupp aanndd SShhuuttddoowwnn