Daikin IOM 1322-1, Installation, Operation And Maintenance Manual

Page: 65 / 80

Startup and Shutdown Procedures
www.DaikinApplied.com 65 IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR
In Step 3, the ‘Teach’ function re-adjusted the flow switch set
point (SP) while flow was at the minimum desired operating
flow. The chiller will not operate at this flow because the
flow switch is OPEN after performing the ‘Teach’ function.
The benefit of the ‘Teach’ function is to quickly set the set
point within the desired operating range. Additional ‘manual’
adjustment of set point is required in order to allow for chiller
operation at this minimum flow. The ‘+’ and ‘-’ buttons on the
face of the flow switch allow for the manual adjustment of the
SP. Pressing the ‘+’ button reduces the flow set point while
pressing the ‘-’ button increases the flow set point. Each button
press, ‘+’ or ‘-‘, changes the flow set point by 2.5 cm/s.
Step 4:
Press the ‘+’ button until LED ‘9’ begins to flash, as
shown in Figure 77. Opening of flow switch should now occur
at approximately 80% to 90% of minimum flow.
Figure 32: Upper Range of Minimum Flow
Step 5
: Once the SP is set, it is recommended that the
sensor be locked to avoid inadvertent readjustment. This
can be performed by pressing both the ‘+’ and ‘-’ buttons
simultaneously for 10 seconds. The indication goes out
momentarily indicating the unit is locked. To unlock, the same
procedure is performed to toggle to unlocked.
NOTE:
18. The LED window display on flow switch represents a
velocity range of 50 cm/s. The window centers on the set
point (SP). For example, if the SP was set to 200 cm/s,
then the LED labeled ‘0’ would represent a velocity of
180 cm/s when lit and the LED labeled 9 would represent
a velocity of 230 cm/s when lit.
19. Each LED represents 5 cm/s, or two presses of the ‘+’ or
‘-’ buttons.
20. When power is initially applied to the flow switch, all
green LEDs light and go out step by step. During this
time, the output is closed. The unit is in the operating
mode.
4. When making manual adjustments to the set point (SP),
if no button is pressed for 2 seconds, the unit returns to
the operating mode with the newly set value.
Flow below display range:
The SP LED will be lit red and
the leftmost LED will be flashing green. For example, if the SP
was set to 200 cm/s, the flashing labeled ‘0’ would indicate that
the flow was below 180 cm/s. This would be shown if no flow
through chiller or lowered than desired flow.
Figure 33: Display for Flow Below Range
Flow above display range: The SP LED will be lit amber, all
LEDs to the left and right of the SP LED with be green with the
rightmost LED flashing green. For example, if the SP was set
to 200 cm/s, the flashing LED labeled ‘9’ would indicate that
the flow was above 230 cm/s. This may be a normal display
depending on range by which flow varies through chiller.
Figure 34: : Display for Flow Above Range Sequence of
Operation