STARTUP AND MAINTENANCE
MAGNITUDE WMT CHILLER
DAIKIN APPLIED
48
Table 24: Flow Volume Calculation
Step 3:
After the ‘Teach’ function is completed and the outer
LEDs have flashed, the flow switch will indicate a new setpoint
based upon the current flow which should still be at the steady
state minimum desired operating flow.
shows a typical
display for this condition. All LEDs to the left of the SP LED are
lit green. The SP LED is lit RED (or may toggle amber) which
indicates that the flow switch is OPEN. Typically, an increase in
fluid flow between 15% to 30% above the ‘Teach’ function flow
is required for the SP LED to turn AMBER and the flow switch to
CLOSE indicating acceptable flow.
Figure 53: Teach Adjustment Complete
In Step 3, the ‘Teach’ function re-adjusted the flow switch 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 setpoint within the desired operating
range. Additional ‘manual’ adjustment of setpoint 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
setpoint while pressing the ‘-’ button increases the flow setpoint.
Each button press, ‘+’ or ‘-‘, changes the flow setpoint by 2.5
cm/s.
Step 4:
Press the ‘+’ button until LED ‘9’ begins to flash, as
shown in
. Opening of flow switch should now occur at
approximately 80% to 90% of minimum flow.
Figure 54: Upper Range of Minimum Flow
Pipe
Size
(inch)
Inside Pipe
Diameter
(inch)
US GPM at the velocities indicated below
GPM
adjustment
per '+' or '-'
key input
Default
20 cm/sec 30 cm/sec 50 cm/sec 75 cm/sec 100 cm/sec 150 cm/sec 200 cm/sec 250 cm/sec 300cm/sec
2
2 .06
6 .86
10 .3
17 .2
25 .7
34 .3
51 .5
68 .6
85 .8
102 .9
1 .72
2 .5
2 .46
9 .79
14 .7
24 .5
36 .7
49 .0
73 .4
97 .9
122 .4
146 .9
2 .42
3
3 .07
15 .1
22 .7
37 .8
56 .7
75 .6
113 .4
151 .2
189 .0
226 .8
3 .78
3 .5
3 .55
20 .2
30 .3
50 .6
75 .8
101 .1
151 .7
202 .2
252 .8
303 .3
5 .06
4
4 .03
26 .0
39 .1
65 .1
97 .7
130 .2
195 .3
260 .4
325 .5
390 .5
6 .51
5
5 .05
40 .9
61 .4
102 .3
153 .5
204 .6
306 .9
409 .2
511 .5
613 .7
10 .2
6
6 .07
59 .1
88 .6
147 .7
221 .6
295 .5
443 .2
590 .9
738 .7
886 .3
14 .8
8
7 .98
102 .3
153 .5
255 .8
383 .7
511 .6
767 .5
1023 .3
1279 .1
1534 .7
25 .6
10
10 .02
161 .3
241 .9
403 .2
604 .8
806 .5
1209 .7
1612 .9
2016 .2
2419 .1
39 .0
12
11 .94
229 .0
343 .4
572 .4
858 .6
1144 .7
1717 .1
2289 .5
2861 .9
3433 .8
57 .2
14
13 .13
276 .8
415 .2
692 .0
1037 .9
1383 .9
2075 .9
2767 .8
3459 .8
4151 .3
69 .2
16
15 .00
361 .5
542 .2
903 .6
1355 .5
1807 .3
2710 .9
3614 .6
4518 .2
5421 .2
90 .4
18
16 .88
457 .5
686 .3
1143 .8
1715 .7
2287 .6
3431 .4
4575 .2
5719 .0
6862 .1
114 .4
20
18 .81
572 .4
853 .0
1421 .6
2132 .4
2843 .2
4264 .8
5686 .4
7108 .0
8528 .6
142 .2
