Start-Up and Shutdown
RTAF-SVX001K-EN
63
Stopped to Starting
The figure below 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 41.
Sequence of events: stopped to starting
6/
/
6
6 12/
/
2
2 2012 -12/
/
2
2 11/
/
1 2012
Confirm Presence
of Oil Within
90 Seconds
6/
6 1
1
1
1
1
//
5
5
/
/
/
5
2
2
2
2
2
/
/
/
/
0
0
0
0
0
0
0
C
0
0
1
1
1
1
1
1
1
C
2
2
2
2
2
2
2
o
Stopped
Or Run
Inhibit
*Lead Compressor (and its lead circuit) is
determined by staging algorithm – “Balanced”,
“Circuit 1 Lead”, or “Circuit 2 Lead” selection –
also influenced by lockouts, restart inhibit, or
diagnostics present
**Note: If Free Cooling is active, it will be the first
stage of cooling to stage on.
6
6
/
/
/
6
1
1
1
1
//
2
2
2
2
2
2
2
/
/
/
2
2
2
2
2
2
/
/
/
/
/
/
0
0
0
1
1
1
2
2
2
-
7
7
7
/
/
/
7
7
7
3
3
3
/
/
/
/
/
/
/
/
/
3
3
3
2
2
2
/
/
/
/
/
/
Stop
6/
6 1
// 3/
3 2
// 012
Auto Mode commanded
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
7
7
7
2
2
2
2
/
/
/
/
/
/
/
/
/
/
/
/
2
2
2
2
2
2
2
2
/
/
/
/
/
/
/
0
0
0
0
1
1
1
1
2
2
2
2
-
-
9
9
9
9
/
/
/
/
/
9
9
9
9
3
3
3
3
/
/
/
/
/
/
/
/
/
/
/
/
3
3
3
3
2
2
2
2
/
/
/
/
/
/
/
0
0
0
0
1
1
1
1
2
2
2
2
Auto
Energize Evaporator
Water Pump Relay
6/
/
6
6 12/
/
2
2 2012 -12/
/
2
2 11/
/
1 2012
Confirm Evaporator Water
Flow Within 20 minutes
(6 Second Filter)
Oil Heaters
Always Energized when
Compressor is De-energized
6/
//
6 1
1
//
//
4
4
4
/
/
4
2
2
//
//
0
W
1
W
2
a
7/
7 3
// /
3 2
2
// 012
E
E
as
s
df
EXV remains closed
Wait for Need
To Cool
(Diff to Start)
9
9
9
9
9
9
/
/
/
/
/
/
/
/
/
9
9
9
9
9
9
2
2
2
2
/
/
/
/
/
/
/
/
/
/
/
2
2
2
2
2
2
2
2
/
/
/
/
/
/
0
0
0
0
1
1
1
1
2
2
2
2
-
1
1
1
1
0
0
0
0
/
/
/
/
/
0
0
0
0
2
2
2
2
/
/
/
/
/
/
/
/
/
/
/
2
2
2
2
2
2
2
2
/
/
/
/
/
/
0
0
0
0
1
1
1
1
2
2
2
2
Auto
9
r
/
9 3
// /
3 2
2
2
// 0
0
0
1
1
((
2
2
D
Di
as
s
df
Call for Cooling**
(Differential to Start is met)
1
1
1
1
0
0
1
1
1
1
0
0
0
12
2
0
0
0
0
0
0
0
/
/
/
/
/
/
/
0
0
0
0
0
0
0
1
1
1
1
1
1
/
/
/
/
/
/
/
//
/
/
/
/
/
/
/
2
2
2
2
2
2
2
/
/
/
/
/
/
/
/
//
0
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
2
-
-
1
1
1
1
1
1
0
0
0
0
0
0
0
/
/
/
/
/
/
/
0
0
0
0
0
0
0
3
3
3
3
3
3
3
/
/
/
/
/
/
/
/
//
1
1
1
1
1
1
/
/
/
/
/
/
/
2
2
2
2
2
2
2
/
//
/
/
/
/
/
/
//
0
0
0
0
0
0
0
1
2
2
Waiting
To Start
10/
0 2
// /
2 2
// 012
asdf
Confirm
Presence of Oil
(0 to 90 seconds)
1
1
1
1
1
1
0
0
0
0
0
0
0
/
/
/
/
/
/
/
0
0
0
0
0
0
0
3
3
3
3
3
3
3
/
/
/
/
/
/
/
/
//
0
0
0
0
0
0
0
/
/
/
/
/
/
/
0
0
0
0
0
0
0
2
2
2
2
2
2
2
/
//
/
/
/
/
/
/
//
0
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
2
-
-
1
1
1
1
1
1
2
2
2
2
2
2
2
/
/
/
/
/
/
/
2
2
2
2
2
2
2
1
1
1
1
1
1
/
/
/
/
/
/
/
//
1
1
1
1
1
1
/
/
/
/
/
/
/
2
2
2
2
2
2
2
/
//
/
/
/
/
/
/
//
0
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
2
Waiting
To Start
10/
0 3
// 1/2
// 012
asdf
12/
2 1
// 1/2
// 012
asdf
Fans pre-start, EXV
moving to
Preposition
0 to 25 Seconds, Evap
Isolation Valve
Compressor Delay Time
has expired
Send Start Command
to Lead Compressor*
Transition to
Running
Start Control of
Condenser Fan Flow
Pre-Position EXV of
Lead Circuit
6
6
6
6
6
6
6
/
/
/
/
/
/
/
/
6
6
6
6
6
6
6
6
6
1
1
1
1
1
1
3
3
3
3
3
3
3
/
/
/
/
/
/
/
/
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
0
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
/
/
/
/
/
/
/
/
2
2
2
2
2
2
2
1
1
1
1
1
1
0
0
0
0
0
0
0
/
/
/
/
/
/
/
/
0
0
0
0
0
0
0
0
0
2
2
2
2
2
2
0
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
Check Evap Pressure for
Low Pressure Cutout
/
6 1
1
1
//
4
4
/
/
P
4
2
P
//
P
P
P
0
r
1
e
2
P
L
