24-4703-1, Rev. A Technical Bulletin T-3100, T-3200, T-3300 Issue Date February 2016 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-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-3300 Remote Mounted Thermostat with External Adjustment Dial, and Bulb Element T-3310 Valve Top Thermostat and Integral Actuator with External Adjustment and Bulb Element (Shown with Optional Valve Position Indicator) T-3110 Valve Top Thermostat and Integral Actuator with External Adjustment Dial and Bulb Element (Shown with Optional Valve Position Indicator) 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 © 2016 Johnson Controls, Inc. 1 Part No. 24-4703-1, Rev. A Code No. LIT-7171155X T-3100, T-3200 and T-3300 Series Installation Data 2 T-3100fT-3200fT-3300 Technical Bulletin Action Set Point Spring Product Code No. (Proportional) Element Adjustment Range Mounting Application T-3100- 2 Direct Acting Bulb External Remote 3 Reverse Acting Single Temperature Direct Acting External 2 Reverse Actins_ Bulb Valve Single T-3110- 3 IS1rect Acting Top Pressure Averaging 6 Direct Acting Concealed Single Temperature Dual Pressure T-3310- DIR @15 PSIG (105 kPa) REV @20 PSIG Dual (140 kPa) Bulb External Valve Temperature Top DIR @20 PSIG Dual (140 kPa) Pressure 2 REV @15 PSIG (105 kPa) DIR @ 15 & 20 PSIG (105 & 140 kPa) REV @11 PSIG Averaging 5 to 10 T-3350- 8 (75 kPa) & External PSIG Piston Low Limit Bulb (35 to 70 Top Inoperative kPa) @11 PSIG (75 kPa) T-3200- DIR @ 15 & 20 Remote PSIG (105 & 140 5 to 10 T-3250- 16 kPa). Inoperative Averaging Concealed PSIG Piston 21 @11 PSIG (35 to 70 Top (75 kPa) kPa) DIR @15 PSIG (105 kPa) REV @20 PSIG T-3300- (140 kPa) Bulb External Remote DIR @20 PSIG (140 kPa) REV @15 PSIG (105 kPa) T-3100!T-3200!T-3300 Technical Bulletin 3 4 T-3100fT-3200fT-3300 Technical Bulletin T-3100!T-3200!T-3300 Technical Bulletin 5 6 T-3100/T-3200/T-3300 Technical Bulletin Installation 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. NOTE: Cut tubing off square for a good fit on the barbed fitting. 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. NOTE: “HP” tubing installation is the same as the drawing below except brass ferrule is replaced with a thermoplastic ferrule supplied with the R-3710-1007 restrictor. Copper Tubing Installation (Use R-3710-1007 In-Line Restrictor) Linkage Assembly with Ball Joint for Type “W” Connection to Damper Shaft Linkage Assembly with: 3/8 in. Diameter Crankarm (D-3000-1071) 7/16 in. Diameter Crankarm (D-3000-1072) 1/2 in. Diameter Crankarm (D-3000-1073) NOTE: For applications which require two (2) Ball Joints, order Ball Joint Code No. D-251-6008 and Connection Head Code No. D-3000-1077. T-3100/T-3200/T-3300 Technical Bulletin 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. It is very important that both stop screws be adjusted equally or the piston will tilt within the cylinder. Be sure the lock nuts are loosened prior to and tightened after adjustments are made. Installation of Sensing Elements Both the bulb and the averaging sensing elements must be carefully located so they measure only the intended air temperature. The majority of terminal air conditioning units are very compact and little clearance exists between coils. Also, the air flows are of widely varying temperature. Before selecting an element location, study the unit interior and make certain that the sensing element will not be affected by undesirable temperatures or mechanical damage. Avoid extremely sharp bends in the capillary which could obstruct the liquid flow. Damper Shaft Modification A D-251-2202 Shaft Extension Kit is available to increase the damper shaft diameter and extend the shaft. The kit consists A D-251-2203 clip is available to increase the diameter of a damper shaft from 7/16 in. to 1/2 in. A D-251-2204 clip is available to increase the diameter of a damper shaft from 3/8 in. to 7/16 in. Route the capillary so it is not in contact with extremely high or low temperature sources such as steam lines, water pipes, coils, etc. Be sure to route the element and capillary so that routine maintenance can be performed on the terminal unit without disturbing the element. Bulb Element In most cases, a bulb element will be installed in the return air chamber of the unit in the following manner. 1. Install the element behind the protective screen or grille and in a location where normal maintenance may be performed on the unit without interference. of a 1-1/2 in. long coupling, 1/2 in. to 1/2 in.; a 1/2 in. diameter shaft extension, 4-3/4 in. long; and D-251-2203 and D-251-2204 clips. NOTE: Both clips are required to increase diameter of 3/8 in. shaft to 1/2 in. NOTE: A D-251-2203 clip can be used to increase the size of a 10 mm shaft sufficiently to use the D-251-2202 shaft extension kit. 2. Be sure the bulb will sense only the return air and will not be influenced by other air temperatures. 3. Secure the bulb by using holder T-275-100 which can be hung or fastened in place and bent to the desired position. 8 T-3100/T-3200/T-3300 Technical Bulletin Averaging Element In most cases, an averaging element will be installed in the discharge air chamber of the unit in the following manner: 1. Install the element in a serpentine fashion across the top of the unit coil. 2. Secure the element along the entire length by using T-275-101 holders so that no part of the element touches the coil. The holder is very flexible and can be bent to any desired position. 3. On face-and-bypass units, the element must be placed in the space where a mixing of coil discharge air (face) and coil bypass air takes place. Install the element as close as possible to the bottom side of the discharge air grille. The element should be secured by using T-275-101 holders fastened to the unit casing. For ASHRAE Cycle III applications, the element must be installed in the mixed air (outside and return) rather than in the discharge air. Install the element so it will receive the best possible sampling of the mixture temperature using holders (T-275-101) fastened to the unit casing. Calibration 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. If, during calibration, the temperature at the measuring element fluctuates, place the element in a stable, well controlled temperature area such as a bucket of water, preferably 75F. Be sure supply air to the instrument is clean and free of moisture. The adjusting dial is graduated in 1F° increments and is removed with flexible hex driver X-200-18. It is recommended that the middle graduation be used to represent the desired temperature set point. Instructions for restricting the set point adjustment are given later. The adjusting screw for externally adjusted, direct acting (DIR) models is located inside the dial post and is accessible by removing the dial only (see detail “A”). For DIR models with concealed adjustment, it is necessary to remove the small metal button in the cover (see detail “B”). Recalibration tool X-200-136 should be used for set point adjustment of these models. It is necessary to remove the dial and cover for models with either reverse acting (REV) or low limit adjustments. Use calibration tool T-4002-5009 for low limit adjustment on the T- 3350 (see detail “D”) and for reverse acting adjustment of the T-3100 and T-3300 series thermostats (see detail “C”). Be sure each T-3100 and T-3110 thermostat has a 0.007 in. in-line restrictor installed in the supply air connection. For T-3200 and T-3250 instruments there must be a 0.007 in. in-line restrictor in the air line between the instrument and the room thermostat. Set Point Adjustment Features (Pictured is the Controller Portion of the T-3350 with Two Elements) T-3100/T-3200/T-3300 Technical Bulletin 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. 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. 4. Remove the test gage and probe assembly. 5. Determine the temperature at the measuring element. 6. Place the dial on the dial post (do not tighten) and position it to the temperature at the element. Remember that each dial increment represents one Fahrenheit degree. For models with concealed adjustment, use calibration tool X-200-136. Test Gage Insertion Instructions 7. Tighten the dial and turn it to the desired set point. Example: Assume the desired temperature set point is 75F and the temperature at the element is 71F. Place the dial on the dial post (do not tighten) and position it to 71F or four graduations (75F-71F±4F°) clockwise from the middle graduation (75F), the desired set point. NOTE: For T-3200 Series, Low Limit Set Point is 56F. Use Calibration Tool X-200-136; each graduation is 9F° (5C°). T-3300 Series 1. Supply the instrument with the appropriate air pressure for the direct acting (DIR) operation. 2. Insert the test gage and probe assembly into the test port. 3. Turn the DIR screw until the output pressure is in the middle of the actuator operating range. 4. Change the supply air pressure to that required for the reverse acting (REV) operation. 5. Turn the REV adjusting screw until the output pressure is in the middle of the actuator operating range. 6. Remove the test gage and probe assembly. 7. Determine the temperature at the element. 8. Place the dial on the dial post (do not tighten) and position it to the temperature at the element. 9. Tighten the dial and turn to the desired set point. NOTE: If the set points of several instruments are to be adjusted before switching the supply pressure, be absolutely sure that the temperature at the element will not change during both stages of adjustment. Two Element Controllers On the T-3350 thermostat with two elements, the averaging element (low limit) is usually located in the unit discharge air and the bulb element is in the return air chamber. 1. Insert the test gage and probe assembly into the test port. 2. Turn all adjusting screws until the output pressure reading is at maximum. 3. Turn the low limit adjusting screw until the output pressure is in the middle of the actuator operating range. 4. Determine the temperature at the low limit element. 5. Using adjusting tool T-4002-5009 (each graduation represents 3-1/2F° for this application), turn the low limit adjusting screw counterclockwise to obtain a set point of 56F. 6. Proceed with the DIR and REV set point adjustment(s) as previously outlined. Next >