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Pneumatic Control Manual 717.1

Controllers and Transmitters Section

Technical Bulletin T-3100, T-3200, T-3300

Issue Date 1076

Part No. 24-4703-1, Rev. --

Code No. LIT-7171155X

T-3100, T-3200 and T-3300 Series

Installation Data

These instructions cover the

installation, calibration, routine

maintenance, troubleshooting and

servicing of the Johnson

T-3100, T-3200 and T-3300

series instruments. These

instructions are on the three types

of thermostats and mountings

available. The table on page 2

lists the available standard

models. Shown below are the

configurations covered by these

instructions.

T-3300 Remote Mounted Thermostat

with External Adjustment Dial, and

Bulb Element

T-3110 Valve Top Thermostat and

Integral Actuator with External

Adjustment Dial and Bulb Element

(Shown with Optional Valve Position

Indicator)

T-3100 Remote Mounted T-3200 Remote Mounted Low

Thermostat with External Limit Thermostat with

Adjustment Dial and Bulb Concealed Adjustment and

Element Averaging Element

T-3250 Piston Top Damper Actuator

and Low Limit Thermostat with

Concealed Adjustment and

Averaging Element

T-3350 Piston Top Damper Actuator

with External Adjustment Dial and

Bulb and Averaging Element

T-3310 Valve Top Thermostat and

Integral Actuator with External

Adjustment and Bulb Element (Shown

with Optional Valve Position Indicator)

Summary of content (12 pages)

PAGE 1
Pneumatic Control Manual 717.1 Controllers and Transmitters Section Technical Bulletin T-3100, T-3200, T-3300 Issue Date 1076 T-3100, T-3200 and T-3300 Series Installation Data These instructions cover the installation, calibration, routine maintenance, troubleshooting and servicing of the Johnson T-3100, T-3200 and T-3300 series instruments. These instructions are on the three types of thermostats and mountings available. The table on page 2 lists the available standard models.
PAGE 2
T-3100/T-3200/T-3300 Technical Bulletin
PAGE 3
T-3100/T-3200/T-3300 Technical Bulletin 3
PAGE 4
T-3100/T-3200/T-3300 Technical Bulletin
PAGE 5
T-3100/T-3200/T-3300 Technical Bulletin 5
PAGE 6
Installation NOTE: Cut tubing off square for a good fit on the barbed fitting. T-3100, T-3200 and T-3300 series thermostats are supplied with barbed fittings for the supply and output air connections. “FR” type polyethylene tubing is to be used on the barbed fittings. If “HP” or copper tubing is used, the barbed fitting(s) must be removed and replaced with a compression fitting, and in-line restrictor when necessary.
PAGE 7
T-3350 Damper Actuator Stop Adjustment For correct stroke adjustment of a damper actuator, the stop screws should be turned in so that the end of the piston seats against the screws at the moment the damper blades reach the desired position. The piston will not move further and no strain is placed on the actuator shaft or the linkage interconnecting the actuator and damper. The force of the air pressure acts against the stops which are designed to carry the force safely.
PAGE 8
Averaging Element Calibration In most cases, an averaging element will be installed in the discharge air chamber of the unit in the following manner: All Johnson instruments are carefully tested and calibrated at the factory before shipment. If required, field calibration should not be started until all installation procedures are complete.
PAGE 9
Temperature Set Point Adjustments T-3100 Series and T-3200 Series 1. Supply the instrument with the proper supply air pressure. 2. Insert the test gage (X-200-19) and the probe assembly (X-200-140) into the output test port. 3. 4. Turn the set point adjustment screw until the pressure reading is approximately in the middle of the operating range of the actuator. For example, a 5 to 10 psig operating range would require an output pressure reading of 7.5 psig. Remove the test gage and probe assembly.
PAGE 10
Restricted Adjustment 2. The dial pointer on externally adjusted models has tabs which are factory set to restrict the dial adjustment to a span of 15F° (7-1/2F° on either side of the pointer). The restriction can be changed to the spans indicated in table below by bending up the appropriate tabs and flattening the factory set tabs. 3. Be sure the temperature measuring element has not been damaged or moved from its intended sensing position. 4. Be sure the actuator is stroking properly.
PAGE 11
Repair Parts Location Adjusting Screw Location C. In-Line Restrictor R-3710-1007 Required as a replacement for restrictor “T” fittings on copper tubing installations. Installation instructions covered on page 6. “T” fitting W/.007” restrictor R-3710-3107 to replace restrictor “T” on T-3100, T-3110, T-3200 and T-3250 thermostats. D. Direct Acting Lid T-3100-601 E. Reverse Acting Lid T-3100-606 F.
PAGE 12
4. If the instrument has two elements and the low limit element must be replaced: a. Remove the screw (1) holding the low limit flexure lever, spacer and lid. b. Remove the clip and screw. Also remove and save the element spacer button. c. Lift the element from its socket. 5. Remove and discard the new element’s holding clip and spacer button. 6. Insert the new element into the socket and replace the spacer button, holding clip and screw. 7. Reassemble the flexure lever, spring, lids and bracket.