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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
Figure 5.
Sequence of events: stopped to starting
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2
Stopped
Stop
Or Run
Inhibit
Confirm Evaporator Water Flow
(6 Second Filter)
7/ 7 3 / / / 3 2
/ / 012
2
as
s
df
6/ 6 1 / / 3/ 3 2 / / 012
RTAF-SVX002D-EN
Auto Mode commanded
by Front Panel or BAS
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-
-
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2
Auto
9
/ 9 3 / / / 3 2
/ / 0
2 2
E E
Enforce Restart Inhibit Timer
r
as
s
(0 to 1 minute)
Energize Evaporator
6/
6 1
/ /
/ /
/ /
1
4
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/ /
/ /
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2
2
0
1
2
W
W
Water Pump Relay
a
6 6 12/
6/
/
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
EXV remains closed
•
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.
Call for Cooling* *
(Differential to Start is met)
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-
-
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-
1
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0 0
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12 2
1
2
2
2
2
Waiting
Auto
To Start
Wait for Need
Confirm
To Cool
Presence of Oil
( (
(Diff to Start)
D D i
(0 to 90 seconds)
0 0
1
1
2
2
df
10/ 0 2 / / / 2 2 / / 012
10/ 0 3 / / 1/2 / / 012
asdf
asdf
6 6 12/
6/
/
2 2 2012-12/
/
2 2 11/
/
1 2012
/
Confirm Presence
C
C
o
6/ 6 1
/ /
1
1
1
1
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1
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1
2
2
2
2
2
2
2
of Oil Within
90 Seconds
*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.
Start-Up and Shutdown
0
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2
Waiting
To Start
Fans pre-start, EXV
moving to
Send Start Command
Preposition
12/ 2 1 / / 1/2 / / 012
to Lead Compressor*
0 to 25 Seconds, Evap
asdf
Isolation Valve
Compressor Delay Time
has expired
Condenser Fan Flow
P P P
P
Pre-Position EXV of
P
r
e
P
/ 6 1
/ /
1
1
4
4
4
/
/ /
/
2
0
1
2
Lead Circuit
L
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2
-
-
-
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2 2
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0
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0
0
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0
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0
0
1
1
1
1
1
1
2
2
2
2
2
2
Check Evap Pressure for
Low Pressure Cutout
Transition to
Running
Start Control of
15
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