4
TROUBLESHOOTING
Symptom
Cause of malfunction / Action
Failure of the controlled equipment
Check external causes first:
eg. pump does not start,
- blown fuses
signal lamps fail to operate etc...
- tripped reset button
- open power switch.
- controlled equipment fails.
- defective wiring to level switch.
Check wiring as per wiring diagrams on page 3
Check actuating arm and magnet assembly
1. Remove switch mechanism
2. Check for wiring interference or binding of actuating arm. The switch and
magnet must move throughout its entire range of motion without interference.
3. Replace the switch mechanism in case of binding.
Check float assembly
1. Remove the unit from service
2. Clean the mechanism if required
3. Tilt the float, when the unit is limited by its motion:
check differential setting (for T3C units only) – see above
4. Replace the unit in case cleaning and/or resetting did not solve the problem.
Float magnet
Switch magnet
Non-magnetic float
holder (pressure
boundary)
Magnet/Switch action
For T31-T35 / T3B / T3D and T3E units
CALIBRATION
Properly selected TUFFY units do not need any fi
eld calibration.
For T3C: fi
eld adjustable differential units
The Adjustable Dif
ferential Tuffy II, model T3C, may be set in the field for one of a variety of level differentials. By specific place-
ment of the stops in the holes of the adjustment plate, the level differential may be changed.
D
C
B
A
E
J
F
G
K
L
H
T
o determine the differential
Example: T3C-C unit with stop holes
B
and
G
1.
Select the rising level of the upper stop:
example: upper stop = hole
B
: +85 mm
2. Select the falling level of the lower stop:
example: lower stop = hole
G
: -205 mm
3. Substract levels:
rising level / upper stop - falling level / lower
stop:
example: +85 mm - (-205 mm) = +290 mm
Example 2:T3C-8 unit: with stop holes
D
and
B
:
+183 mm - (+115 mm) = 68 mm
Impossible stop hole combinations due to the diameter of the stem (of the fl
oat):
Stop holes in mm (divide by 25,4 to obtain inches)
Upper stops
middle
Lower stops
Partnumber
Level
B
C
D
K
L
A
E
F
G
H
J
T3C-4XXX-XXX
Rising
+47
+90 +124
+39 +104
+4
-37
n/a
n/a
-42
n/a
Falling
+80
n/a
n/a
+84
n/a
+38
-10
-47
-82
+4
-62
T3C-8XXX-XXX
Rising
+63 +131 +183
+51 +153
-3
-67
n/a
n/a
-75
n/a
Falling
+115
n/a
n/a
+122
n/a
+50
-25
-84 -136
-3
-106
T3C-CXXX-XXX
Rising
+85 +183 +259
+67 +215
-11
-105
n/a
n/a
-115
n/a
Falling
+160
n/a
n/a
+170
n/a
66
-43
-128 -205
-11
-106
A
and
B
A
and
E
A
and
H
A
and
K
B
and
C
B
and
K
C
and
D
C
and
K
C
and
L
D
and
L
E
and
F
E
and
H
F
and
H
F
and
J
F
and
G
J
and
G
Содержание Tuffy T3 series
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