Operating Instructions; Operator Duties; Prepare The Chiller For Start-Up; To Start The Chiller - Carrier AquaEdge 19DV series Start-Up, Operation And Maintenance Instructions Manual

45
40
35
30
25
20
15
10
5
0
0 10 20 30 40 50 60
GV_POS
Fig. 33 — Effect of SURGE DELTA TSMAX on
Surge Prevention
60.00
55.00
50.00
45.00
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0 10 20 30 40 50
GV_POS
Fig. 34 — Effect of SURGE LINE SHAPE FACTOR
on Surge Prevention
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0 10 20 30 40 50
GV_POS
Fig. 35 — Effect of SURGE LINE SPEED FACTOR
on Surge Prevention
If ACTUAL GUIDE VANE POSITION is less than 30%,
go to Step 1. If ACTUAL GUIDE VANE POSITION is greater
than 60%, then go to Step 3.
1. Do not change SURGE LINE SHAPE FACTOR from
the value selected by Chiller Builder (ECAT). Decrease
SURGE DELTA TSMIN in 1°F steps up to 5 times.
Monitor chiller for surge.
Tsmax=60
Tsmax=70
Tsmax=80
a19-1960
70 80 90 100 110
Shape factor
= -0.020
Shape factor
= -0.040
Shape factor
= -0.050
60 70 80 90 100 a19-1961 110
Speed Factor
=1.60
Speed Factor
=1.85
Speed Factor
=2.00
a19-1962
60 70 80 90 100 110
2. If ACTUAL GUIDE VANE POSITION is still less than
30% and Step 1 failed, increase the value of SURGE
LINE SHAPE FACTOR in steps of 0.01 up to 2 times.
For example, if surge is encountered when shape factor
is –0.06, increase the SURGE LINE SHAPE FACTOR
to –0.05. If this does not solve the problem, go to Step 5,
even if ACTUAL GUIDE VANE POSITION is less
than 30%.
3. Do not change SURGE LINE SHAPE FACTOR from
the value selected by Chiller Builder (ECAT). Decrease
SURGE DELTA TSMAX by 1°F steps up to 5 times.
Monitor chiller for surge.
4. If ACTUAL GUIDE VANE POSITION is greater than
60% and Step 3 failed to eliminate surge, then set
SURGE DELTA TSMAX to 5°F below the value speci-
fied by Chiller Builder (ECAT). Increase the value of the
SURGE LINE SHAPE FACTOR in steps of 0.01 up to 2
times. For example, if surge is encountered when the
SURGE LINE SHAPE FACTOR is –0.06, increase the
SURGE LINE SHAPE FACTOR to –0.05. If this does
not solve the problem, go to Step 5, even if ACTUAL
GUIDE VANE POSITION is greater than 60%.
5. If ACTUAL GUIDE VANE POSITION is greater than
30% but less than 60% or if Step 2 failed (with ACTUAL
GUIDE VANE POSITION less than 30) or if Step 4
failed (with ACTUAL GUIDE VANE POSITION great-
er than 60), then perform this step. Do not change
SURGE LINE SHAPE FACTOR from the value speci-
fied by Chiller Builder (ECAT). Reset SURGE DELTA
TSMIN and SURGE DELTA TSMAX to the value spec-
ified by Chiller Builder (ECAT). Decrease SURGE DEL-
TA TSMIN and SURGE DELTA TSMAX in steps of 1°F
up to 5 times. Monitor chiller for surge.
If the drive does not slow down adequately at part load, then
the machine may be operating at a point above the configured
"software" surge line and the machine is in surge prevention
mode. Check for a surge protection message on the HMI. If the
unit is not in a surge protection state, then the ENVELOPE
SPEED FACTOR may need to be increased (more aggressive
surge line protection) in combination with a decrease in the
SURGE LINE SHAPE FACTOR.

OPERATING INSTRUCTIONS

Operator Duties

1. Become familiar with the chiller and related equipment
before operating the chiller.
2. Prepare the system for start-up, start and stop the chiller,
and place the system in a shutdown condition.
3. Maintain a log of operating conditions and document any
abnormal readings.
4. Inspect the equipment, make routine adjustments, and
perform a Control Test. Maintain the proper refrigerant
levels.
5. Protect the system from damage during shutdown periods.
6. Maintain the set point, time schedules, and other PIC
functions.
Prepare the Chiller for Start-Up —
described in the Initial Start-Up section, page 33.

To Start the Chiller

1. Start the water pumps, if they are not automatic.
2. Press the Start/Stop icon on the HMI home screen to start
the system. If the chiller is in the OCCUPIED mode and
the start timers have expired, the start sequence will start.
Follow the procedure described in the Start-Up/Shut-
down/Recycle Sequence section, page 12.
35
Follow the steps