Daikin WGZ200DW - Page 96

IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 96 www.DaikinApplied.com

In Step 3, the ‘Teach’ function re-adjusted the ow switch set
point (SP) while ow was at the minimum desired operating
ow. The chiller will not operate at this ow because the
ow switch is OPEN after performing the ‘Teach’ function.
The benet 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 ow. The ‘+’ and ‘-’ buttons on the
face of the ow switch allow for the manual adjustment of the
SP. Pressing the ‘+’ button reduces the ow set point while
pressing the ‘-’ button increases the ow set point. Each button
press, ‘+’ or ‘-‘, changes the ow set point by 2.5 cm/s.
Step 4: Press the ‘+’ button until LED ‘9’ begins to ash, as
shown in Figure 77. Opening of ow switch should now occur
at approximately 80% to 90% of minimum ow.
Figure 48: 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:
1. The LED window display on ow 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.
2. Each LED represents 5 cm/s, or two presses of the ‘+’ or
‘-’ buttons.
3. When power is initially applied to the ow 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.
belowThe SP LED will be lit red and
the leftmost LED will be ashing green. For example, if the SP
was set to 200 cm/s, the ashing labeled ‘0’ would indicate that
the ow was below 180 cm/s. This would be shown if no ow
through chiller or lowered than desired ow.
Figure 49: Display for Flow Below Range
above 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 ashing green. For example, if the SP was set
to 200 cm/s, the ashing LED labeled ‘9’ would indicate that
the ow was above 230 cm/s. This may be a normal display
depending on range by which ow varies through chiller.
Figure 50: : Display for Flow Above Range