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12 T-3100, T-3200, and T-3300 Series Controllers Product/Technical Bulletin
Restricted Adjustment
The dial pointer on externally adjusted models has tabs
which are factory set to restrict the dial adjustment to a span
of 15F° (7.5°F on either side of the pointer). The restriction
can be changed to the spans indicated in Table 2 by bending
up the appropriate tabs and flattening the factory set tabs.
Table 2: Span Adjustment
Span Tab
20 11
.1
+
10
+
5.6
15 8.
3
+
7.5
+
4.2
10 5.
6
+
5
+
2.8
52.
8
+
2.5
+
10
10°F
7.F
F
2.F
10°F
7.5°F
F
2.F
Figure 16: Restricted Adjustment
M
aintenance and
Troubleshooting Procedures
These instruments are designed so that a minimum of routine
maintenance is required. The following procedures should
be used to ensure proper operation and to locate
malfunctioning components:
1. Check all air lines, connections, and diaphragms for air
leaks. Make sure that the in-line restrictors are not
defective.
2. Check the operation of the thermostat to be sure it is
passing the correct control signal and that it is
functioning properly. Make sure it has the proper
supply air pressure and that air is exhausting from the
control port. The port must exhaust continuously to
ensure proper operation of the thermostat.
3. Check that the temperature measuring element has not
been damaged or moved from its intended sensing
position.
4. Check that the valve packing nut is tight enough to
prevent leaks, but not so tight that the packing becomes
distorted and binds the stem; usually finger tight is
sufficient. If the valve is leaking around the
centerpiece, tighten it with the appropriate wrench.
5. Verify that the valve seats completely when the actuator
is fully stroked. If there is fluid flow after the plug is
seated, the seat, plug, or disc may be worn or scored
and should be repaired or replaced.
6. If there are slave actuators, make sure the actuators are
operating in the proper sequence and adjusted correctly.