Trane Ascend ACR Series User Manual

AC-SVX001A-EN
71
Stopped to Starting
The following diagram shows the timing from a
stopped mode to energizing the first compressor. The
shortest allowable time would be under the following
conditions:
• No motor restart inhibit time left from subsequent
starts
• Evaporator Water flow occurs quickly with pump on
command
• Need to cool (differential to start) already exists
• The above conditions would allow a compressor to
start in about 20 seconds.
Figure 53. Sequence of events: stopped to starting
6
/
1
2
/
2
0
1
2
-
1
2
/
1
1
/
2
0
1
2
Confirm Presence
of Oil W ithin
90 Seconds
6
/
1
1
5
5
5
5
5
/
/
/
/
2
2
2
22
2
2
2
0
0
0
0
0
0
0
0
0
C
0
0
111111
1
1
1
C
222222
2
2
2
o
Stopped
Or Run
Inhibit
6
6
6
6
6
6
/
/
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
/
/
/
/
2
2
2
2
0
0
0
0
1
1
1
1
2
2
2
2
-
7
7
7
7
/
/
/
/
3
3
3
3
/
/
/
/
2
2
2
2
Stop
6
/
1
3
/
2
0
1
2
Auto Mode com m anded
by Front Panel or BAS
Confirm Evaporator Water Flow
(6 Second Filter)
Enforce Restart Inhibit Timer
(0 to 1 minute)
7
7
7
7
7/
/
/
/
/2
2
2
2
2/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2 -
-
-
9
9
9
9
9/
/
/
/
/3
3
3
3
3/
/
/
/
/2
2
2
2
20
0
0
0
01
1
1
1
12
2
2
2
2
Auto
Energize Evaporator
Water Pum p Relay
6
/
1
2
/
2
0
1
2
-
1
2
/
1
1
/
2
0
1
2
Confirm Evaporator Water
Flow W ithin 20 minutes
(6 Second Filter)
Oil Heaters
Always Energized when
Compressor is De-energized
6
/
/
1
1
4
4
4
/
2
2
2
0
W
1
W
2
a
7
/
3
/
2
2
0
1
2
E
E
a
s
d
f
EXV remains closed
Wait for Need
To Cool
(Diff to Start)
9
9
9
9
9
9
/
/
/
/
///
/
/
/
/
2
2
2
2
/
/
/
/
/2
2
2
2
0
0
0
0
01
1
1
1
2
2
2
2
-
-
-
1
1
1
1
0
0
0
0
0/
/
/
/
/2
2
2
2
/
/
/
/
/2
2
2
2
0
0
0
0
01
1
1
1
2
2
2
2
Auto
9
/
3
/
2
2
0
0
1
1
((
2
2
a
s
s
d
f
Call for Cooling
(Differential to Start is met)
1
1
1
1
1
1
00
0
0
0
0
0
0
0
0
0
/
/
/
/
/
/
/
1
1
1
1
1
1
/
/
/
/
/
/
/
2
2
2
2
2
2
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
--
-
- 1
1
1
1
1
1
0
0
0
0
0
0
/
/
/
/
/
/
/
3
3
3
3
3
3
1
1
1
1
1
1
/
/
/
/
/
/
/
2
2
2
2
2
2
0
0
0
0
0
1111
1
Waiting
To Start
1
0
/
2
/
2
0
1
2
a
s
d
f
Confirm
Presence of Oil
(0 to 90 seconds)
1
1
1
1
1
1
0
0
0
0
0
0
/
/
/
/
/
/
/
3
3
3
3
3
3
0
0
0
0
0
0
/
/
/
/
/
/
/
2
2
2
2
2
2
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
--
-
- 1
1
1
1
1
1
2
2
2
2
2
2
/
/
/
/
/
/
/
1
1
1
1
1
1
1
1
1
1
1
1
/
/
/
/
/
/
/
2
2
2
2
2
2
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
2
Waiting
To Start
1
0
/
3
1
/
2
0
1
2
a
s
d
f
1
2
/
1
1
/
2
0
1
2
a
s
d
f
EXV m oving to
Preposition
0 to 25 Seconds
Send Start Command
to Lead Com pressor*
Transition to
Running
Start Control of
Condenser Fan Flow
Pre-Position EXV of
Lead Circuit
6
6
666
6
6
6
/
/
///
/
/
/
1
1
111
1
1
1
3
3
333
3
3
3
/
/
///
/
/
/
2
2
222
2
2
2
0
0
000
0
0
0
1
1
111
1
1
1
2
2
222
2
2
2
-
-
-
-
1
1
111
1
1
1
2
2
222
2
2
2
/
/
///
/
/
/
1
1
111
1
1
1
0
0
000
0
0
0
/
/
///
/
/
/
2
2
222
2
2
2
0
0
000
0
0
0
1
1
111
1
1
1
2
2
222
2
2
2
Check Evap Pressure for
Low Pressure Cutout
/
1
1
4
/
/
2
P
0
r
1
e
2
P
L
* Lead compressor (and its lead circuit) is
determined by staging algorithm - “Fixed Staging”
or “Balanced Wear” selection - also influenced by
lockouts, restart inhibit, or diagnostics present.
SSttaarrtt--uupp aanndd SShhuuttddoowwnn

Trane Ascend ACR Series Specifications

General

Brand	Trane
Model	Ascend ACR Series
Category	Chiller
Language	English