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Start-Up and Shutdown
Power Up to Starting
The Power up to starting diagram shows the timing from
a power up event to energizing the 1
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
•
Power up Start Delay set to 0 minutes
Figure 4.
Sequence of events: power up to starting
Auto Mode commanded
Auto Mode commanded
by Front Panel or BAS
by Front Panel or BAS
Power
Power
Power
Power
Power
Applied
Applied
Up
Up
Up
Symbio
Symbio
Confirm Evaporator Water Flow
Confirm Evaporator Water Flow
800
800
(6 Second Filter)
(6 Second Filter)
Boot Time
Boot Time
(15 Sec)
(15 Sec)
Enforce Restart Inhibit Timer
Enforce Restart Inhibit Timer
(0 to 1 minute)
(0 to 1 minute)
EXVs self-
EXVs self-
(User Adjustable 0 to 30 minutes)
(User Adjustable 0 to 30 minutes)
close on
close on
power up
power up
Oil Heaters
Oil Heaters
Always Energized
Always Energized
when Compressor
when Compressor
is De-energized
is De-energized
**If Free Cooling is available, it shall be the first level control to start.
Partial Free Cooling: will always be attached to circuit 1 and circuit 2 will be the
lead circuit. If Free Cooling is available, then both compressors on circuit 2
should start before starting a compressor on circuit 1.
Total Free Cooling: balanced starts and hours or circuit x lead are available.
However, just like Partial Free Cooling, both compressors on a circuit should be
running before starting the other circuit.
14
st
compressor. The
Auto
Auto
Auto
Power Up Delay Inhibit Timer
Power Up Delay Inhibit Timer
Energize Evaporator
Energize Evaporator
Water Pump Relay
Water Pump Relay
Confirm Evaporator Water
Confirm Evaporator Water
Confirm Evaporator Water
Flow Within 20 minutes
Flow Within 20 minutes
Flow Within 20 minutes
(6 Second Filter)
(6 Second Filter)
(6 Second Filter)
EXV remains closed
EXV remains closed
•
Need to cool (differential to start) already exists
•
Oil level is detected immediately
The above conditions would allow for a minimum power
up to starting the 1
(variations may exist due to options installed). Note that it
is not advisable to start a chiller "cold", the oil heaters
should be in operation for a sufficient length of time prior
to first start. Consult the chiller's IOM for specifics.
Call for Cooling**
Call for Cooling**
(Differential to Start is met)
(Differential to Start is met)
Waiting
Waiting
Waiting
Auto
Auto
Auto
To Start
To Start
To Start
Wait for Need
Wait for Need
Confirm
Confirm
To Cool
To Cool
Presence of Oil
Presence of Oil
(Diff to Start)
(Diff to Start)
(0 to 90 seconds)
(0 to 90 seconds)
Confirm Presence
Confirm Presence
Confirm Presence
Confirm Presence
of Oil Within
of Oil Within
of Oil Within
of Oil Within
90 Seconds
90 Seconds
90 Seconds
90 Seconds
* Lead Compressor (and its lead circuit) is
* Lead Compressor (and its lead circuit) is
determined by staging algorithm – "Balanced",
determined by staging algorithm – "Balanced",
"Circuit 1 Lead", or "Circuit 2 Lead" selection –
"Circuit 1 Lead", or "Circuit 2 Lead" selection –
also influenced by lockouts, restart inhibit, or
also influenced by lockouts, restart inhibit, or
diagnostics present
diagnostics present
st
compressor time of about 45 seconds
Waiting
Waiting
Waiting
To Start
To Start
To Start
Send Start Command
Send Start Command
to Lead Compressor*
to Lead Compressor*
Fans pre-start,
Fans pre-start,
EXVs moving to
EXVs moving to
Preposition
Preposition
0 to 25 Seconds; Evap
0 to 25 Seconds; Evap
Condenser Fan Flow
Condenser Fan Flow
Isolation Valve
Isolation Valve
Compressor Delay Time
Compressor Delay Time
has expired
has expired
Pre-Position EXV of
Pre-Position EXV of
Pre-Position EXV of
Lead Circuit
Lead Circuit
Lead Circuit
Check Evap Pressure for
Check Evap Pressure for
Check Evap Pressure for
Check Evap Pressure for
Low Pressure Cutout
Low Pressure Cutout
Low Pressure Cutout
Low Pressure Cutout
RTAF-SVX002D-EN
Transition to
Transition to
Running
Running
Start Control of
Start Control of
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