CAUTION
- Risk of property damage
- Do not set the switch lower than the factory setting. The switch is factory set at approximately the minimum flow rate. A lower setting may result in the switch failing to return to a no-flow position which may result in damage to the controlled equipment or other property.
ATTENTION
- Risque de dégâts matériels.
- Ne pas régler le commutateur sur une valeur inférieure au paramètre d'usine. Le commutateur est réglé en usine sur une valeur correspondant environ au débit minimum. Un réglage sur une valeur inférieure risque d'empêcher le commutateur de revenir sur une position « aucun-débit », ce qui risque d'endommager l'équipement contrôlé ou de provoquer d'autres dégâts matériels.
CAUTION
- Risk of Property Damage.
- Do not attempt to change sealed settings. Attempted adjustment may damage the control or cause loss of calibration or other property damage.
ATTENTION
- Risque de dégâts matériels.
- Ne pas essayer de modifier la position des éléments de réglage bloqués. Toute tentative de réglage risque d'endommager le dispositif de contrôle ou de provoquer la perte des valeurs d'étalonnage ou d'autres dégâts matériels.
To adjust the setting of the flow switch:
- Disconnect the power supply before making any electrical connections.
- Remove the enclosure cover.
- Adjust the control’s flow rate. For more information, see Figure 1.
- Turn the adjustment screw clockwise to raise the flow rate required to activate the switch.
- Turn the adjustment screw counterclockwise to lower the flow rate required to activate the switch.
Figure 1. Flow Rate Adjustment
Note: Do not lower the flow rate required to activate the switch, unless the flow rate required to activate the switch is above the factory-set flow rate. - Replace the enclosure cover and tighten the cover screws with 12 in•lb of torque.
To verify that the flow rate is set above the factory minimum, depress the main lever multiple times. For more information on the main lever, see Figure 2.
- If the lever clicks every time when returning to the original position, then the control’s flow rate may be set at or above the factory-set minimum value.
- If the lever fails to click every time when returning to the original position, then the control’s flow rate is set below the factory-set minimum value.
Turn the adjustment screw clockwise to raise the flow rate required to activate the switch. See Figure 1.
Figure 2. Minimum adjustment
| Callout | Description |
|---|---|
| A | Wiring terminals |
| B | Adjustment screw |
| C | Main lever |
| GPM (m3/hr) required to activate switch for pipe size (in.) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1-1/41 | 1-1/21 | 2 | 2-1/22 | 3 | 43 | 53 | 63 | 83 | ||
| Minimum adjustment | Flow increase (Close R to Y) |
4.20 (0.95) |
5.80 (1.32) |
7.50 (1.70) |
13.7 (3.11) |
18.0 (4.09) |
27.5 (6.24) |
65.0 (14.8) |
125 (28.4) |
190 (43.2) |
375 (85.2) |
| Flow decrease (Close R to B) |
2.50 (0.57) |
3.70 (0.84) |
5.00 (1.14) |
9.50 (2.16) |
12.5 (2.84) |
19.0 (4.32) |
50.0 (11.4) |
101 (22.9) |
158 (35.9) |
320 (72.7) |
|
| Maximum Adjustment | Flow increase (Close R to Y) |
8.80 (2.0) |
13.3 (3.02) |
19.2 (4.36) |
29.0 (6.59) |
34.5 (7.84) |
53.0 (12.0) |
128 (29.1) |
245 (55.6) |
375 (85.2) |
760 (173) |
| Flow decrease (Close R to B) |
8.50 (1.93) |
12.5 (2.84) |
18.0 (4.09) |
27.0 (6.13) |
32.0 (7.27) |
50.0 (11.4) |
122 (27.7) |
235 (53.4) |
360 (81.8) |
730 (166) |
|
| GPM (m3/hr) required to activate switch for pipe size (in.) | |||||
|---|---|---|---|---|---|
| 4 | 5 | 6 | 8 | ||
| Minimum adjustment | Flow increase (Close R to Y) |
37.0 (8.40) | 57.0 (12.9) | 74.0 (16.8) | 205 (46.6) |
| Flow decrease (Close R to B) |
27.0 (6.13) | 41.0 (9.31) | 54.0 (12.3) | 170 (38.6) | |
| Maximum adjustment | Flow increase (Close R to Y) |
81.0 (18.4) | 118 (26.8) | 144 (32.7) | 415 (94.3) |
| Flow decrease (Close R to B) |
76.0 (1.93) | 111 (25.2) | 135 (30.7) | 400 (90.8) | |
| Pipe size | ||||
|---|---|---|---|---|
| 1/2 x 1/2 in. female NPTF4 | 3/4 x 3/4 in. female NPTF5 | 3/4 x 3/4 in. female NPTF6 | ||
| Minimum adjustment | Flow increase (R to Y Closes) |
1.30 (4.92) | 2.00 (7.57) | 10.90 (41.26) |
| Flow decrease (R to B Closes) |
0.60 (2.27) | 0.60 (2.27) | 7.20 (27.25) | |
| Maximum adjustment | Flow increase (R to Y Closes) |
2.60 (9.84) | 3.60 (13.63) | 17.00 (64.35) |
| Flow decrease (R to B Closes) |
1.25 (4.73) | 1.30 (4.92) | 14.20 (53.75) | |
Figure 3. Pressure drop against flow rate for sample F261 Series Low-Flow
Switches
Note: This chart is
correct for F261KEH-V01C, F261MEH-V01C, F261KFH-V01C, and F261MFH-V01C low-flow
switches.
1 Values for 2 in.
paddle trimmed to pipe.
2 Values for a 3 in.
paddle trimmed to fit pipe.
3 Values calculated
for a factory-installed set of 1, 2, and 3 in. paddles.
4 F261KEH-V01C,
F261MEH-V01C
5 F261KFH-V01C,
F261MFH-V01C
6 F261KFH-V02C
(designed for steam applications)