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Figure 82: Flow Switch Details
If the flow sensor is to be mounted away from the unit, the
sensor should be mounted on the wall of the outlet pipe to
the evaporator, or in a run of straight pipe that allows 5 to 10
pipe diameters prior to the sensor and 3 to 5 pipe diameters
of straight pipe after the sensor. Flow switch is placed in outlet
pipe to reflect flow leaving the barrel. If installation on the
inlet pipe is necessary, contact Chiller Technical Response
at TechResponse@DaikinApplied.com to review the jobsite
details.
NOTE: DO NOT alter or relocate factory installed flow switch.
If issues exist, contact Chiller Technical Response at
TechResponse@DaikinApplied.com.
If needed, the adapter is threaded into the pipe using pipe
sealant appropriate for the application. The flow sensor is
mounted onto the adapter using silicone grease. Carefully
apply lubricant to the inside threads and o-ring so temperature
probe does not become coated with lubricant. Torque the
adapter/sensor connection to 18.5 ft/lbs.
Table 60: Flow Volume Calculation
Inside
Pipe
Pipe
Default
Diameter
Size
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
(inch)
(inch)
2
2.06
6.86
2.5
2.46
9.79
3
3.07
15.1
3.5
3.55
20.2
4
4.03
26.0
5
5.05
40.9
6
6.07
59.1
8
7.98
102.3
10
10.02
161.3
12
11.94
229.0
14
13.13
276.8
16
15.00
361.5
18
16.88
457.5
20
18.81
572.4
www.DaikinApplied.com
US GPM at the velocities indicated below
10.3
17.2
25.7
14.7
24.5
36.7
22.7
37.8
56.7
30.3
50.6
75.8
39.1
65.1
97.7
61.4
102.3
153.5
88.6
147.7
221.6
153.5
255.8
383.7
241.9
403.2
604.8
343.4
572.4
858.6
415.2
692.0
1037.9
542.2
903.6
1355.5
686.3
1143.8
1715.7
853.0
1421.6
2132.4
Wiring
Refer to wiring diagram in the unit control panel. Either AC or
DC is used to power the flow switch. The unit controller's digital
input is a DC signal which is supplied through the switch output
of the flow switch for flow indication. It is required that the AC
and DC commons of power be separated. Contact Chiller
Technical Response for alternate wiring scenarios.
Figure 83: Remote Mounting Guidelines for Flow Switch
Flow Switch Setup
The flow switch comes from the factory set at a default
velocity of 20 cm/s. This value is typically well below the
minimum water flow specified for the unit's evaporator so field
adjustment is required for adequate low flow protection.
60
are the calculated gallons per minute (gpm) for Schedule 40
steel pipe for various fluid velocities from 20 cm/s to 300 cm/s.
The flow switch has an overall range of adjustment from 3 cm/s
to 300 cm/s.
34.3
51.5
68.6
49.0
73.4
97.9
75.6
113.4
151.2
101.1
151.7
202.2
130.2
195.3
260.4
204.6
306.9
409.2
295.5
443.2
590.9
511.6
767.5
1023.3
806.5
1209.7
1612.9
1144.7
1717.1
2289.5
1383.9
2075.9
2767.8
1807.3
2710.9
3614.6
2287.6
3431.4
4575.2
2843.2
4264.8
5686.4
89
IOM 1242-8 • PATHFINDER
Startup and Shutdown
Table
GPM
adjustment
per '+' or '-'
key input
85.8
102.9
1.72
122.4
146.9
2.42
189.0
226.8
3.78
252.8
303.3
5.06
325.5
390.5
6.51
511.5
613.7
10.2
738.7
886.3
14.8
1279.1
1534.7
25.6
2016.2
2419.1
39.0
2861.9
3433.8
57.2
3459.8
4151.3
69.2
4518.2
5421.2
90.4
5719.0
6862.1
114.4
7108.0
8528.6
142.2
MODEL AWV CHILLERS
®
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