I N STALL AT ION & O PERATIO N MANUAL TA 1/ TA 2 CONTROLLER
IOM TA1/TA2 C O N T R O L L E R Table of Contents Table of Contents...2 List of Figures...3 List of Tables...3 Section 1 - General Information...4 Power Requirements...4 Damper Control...4 Live Supply Volume Readout...4 Supply Air Temperature Sensing...4 Night Setback/Unoccupied Signal...5 Night Setback Temperature Adjustment...6 Fan Control...6 On/Off ReHeat Control...6 Proportional Reheat Conrol...6 Thermostat Calibration...6 Single Duct Terminal Units without Reheat...7 Thermostat Calibration Procedure...7 Optional Morning Warm-Up (MWU) Operation...7 Check-Out Procedure...7 Single Duct Terminal Units with Reheat...7 Thermostat Calibration Procedure...7 Check-Out Procedure...7 Single Duct Terminal Units with Reheating/Cooling Autochangeover (ACO)...7 Thermostat Calibration Procedure...7 Check-Out Procedure...7 Important Operational Note...7 Fan Powered Terminal Units without Heat...7 Thermostat Calibration Procedure...7 Optional Morning Warm-Up (MWU) Operation...7 Optional Night Shutdown (NSD) Operation...7 Optional Night Setback (NSB) Operation...7 Check-Out Procedure (Day/Occupied Mode)...8 Check-Out Procedure (Night/Unoccupied Mode)...8 Check-Out Procedure (Day/Occupied Mode)...8 Troubleshooting Procedures...8 To Check Operation of Controller s Damper Output Circuit and Acuator...8 If an Actuator Appears to be Inoperative...8 To Check Operation of Controller s On/Off Reheat Output Circuit...8 If Reheat Stages are On When They Should Be Off...8 If Desired Thermostat Voltage Settings Cannot be Acheived...8 If Voltage Readings Float or Appear to be Unstable during Tharmostat Calibration...8 Parts/Part Numbers...9 2
List of Figures Figure 1 - DC Voltmeter and Thermostat...4 Figure 2 - Thermostat...4 Figure 3 - Differential Pressure Switch...4 Figure 4 - TA1 Controller Voltage vs. Airflow Curves (4-9)...5 Figure 5 - TA1 Controller Voltage vs. Airflow Curves (10-16, 8x and 16x)...5 Figure 6 - Controller...6 Figure 7 - Thermostat...6 Figure 8 - Silicon Contolled Rectifier (SCR)...6 List of Tables Table 1 - AeroCross K-Factors...5 Table 2 - Setback Temperatures/Resistor Values...6 3
IOM TA1/TA2 C O N T R O L L E R Section 1 - General Information GENERAL INFORMATION Power Requirements TITUS TA1/TA2 controllers operate on 24 VAC power. Power required to operate the controller and actuator is 7 VA plus any output loads for fan relays, heating contactors, and control valves (assume 10 VA each). Always switch control voltage off prior to disconnecting any wires from the controller to prevent possible damage to control components. Damper Control TITUS TA1/TA2 controllers provide pressure independent VAV control for terminal primary air valves. Primary airflow volume is monitored by means of a multipoint center-averaging velocity sensor located in the inlet duct. Differential pressure is measured by an on-board platinum ceramic transducer. Dampers are always shipped full open and move counter-clockwise (CCW) to close. The primary damper opens and closes to vary air volume to match cooling demand. Changes in static pressure will result in damper position changes for a given flow volume. In automatic changeover(aco) sequences, the primary damper also moves to match heating demand. If the primary fan system is off and the terminal is calibrated to control a minimum flow limit other than 0 cfm, the damper will drive full open. Flow limit adjustments are made using a digital DC voltmeter at the thermostat (As shown in Figure 1). Figure 1 - DC Voltmeter and Thermostat Live Supply Volume Readout A voltage output corresponding to actual primary air volume may be monitored at the thermostat to assist in balancing and troubleshooting these units. This output signal follows the same cfm vs DC voltage calibration curve that is shown on Page 2. The same thermostat calibration cable (TITUS P/N 100310-01) that is used to make airflow limit adjustments is also used to read primary air volume on the outermost meter taps. (As shown in Figure 2) Figure 2 - Thermostat Supply Air Temperature Sensing A duct-mounted thermistor is used to measure primary air temperature in sequences involving automatic changeover (ACO) or morning warm-up (MWU). It is fastened to the inlet duct with a sheetmetal screw and wired to terminals X and Y on the controller. Alternatively, autochangeover and morning warm-up may be triggered by a contact closure. When controller terminals X and Y are shorted together, the unit will operate in the heating or morning warm-up mode. When there is an open circuit between X and Y, the unit will operate in the cooling mode. Figure 3 - Differential Pressure Switch 4
Section 1 - General Information Night Setback/Unoccupied Signal Units ordered with optional night setback (NSB) sequences employ a differential pressure switch (As shown in Figure 3) to sense loss of primary duct static pressure. By this method, these units change operating mode when the air handler fan is de-energized. Alternatively, night setback operation may be triggered by a 24 VAC signal (10 ma) from a source external to the unit. Whenever 24 VAC is applied to controller terminals -NSB and NSB, unit will operate in night setback mode. Figure 4 - TA1 Controller Voltage vs. Airflow Curves (4-9) Table 1 - AeroCross K-Factors Figure 5 - TA1 Controller Voltage vs. Airflow Curves (10-16, 8x and 16x) 5
IOM TA1/TA2 C O N T R O L L E R Section 1 - General Information Night Setback Temperature Adjustment Adjustment of setback temperature is made by means of a plug-in resistor (As shown in Figure 6). All TA1 controls provide a 47k ohm resistor that provides an approximate 10 F setback in heating. Other 1/4 watt resistors may be substituted in the field to achieve various setback temperatures (see Table 2). Figure 6 Controller Table 2 Setback Temperatures/Resistor Values Fan Control The TITUS TA1 provides sequencing for continuous and intermittent unit fan operation. Fan relays with 24 VAC coils (10 VA max) are wired to terminal FAN/1. Fan will run intermittently for parallel fan sequences if jumper J1 on board is intact. Cutting jumper J1 will result in continuous operation during occupied mode suitable for series fan sequences. Fan volume adjustments are made with a screwdriver by means of a silicon-controlled rectifier (SCR) located on the side of the hi voltage control box. (As shown in Figure 8) Figure 7 Thermostat On/Off Reheat Control The TITUS TA1 provides sequencing for up to three stages of on/off heat. Heat contactors with 24 VAC coils (10 VA max each) are wired to terminals Fan/1, 1/2, and 2/3. Fan-powered sequences are limited to two stages of heat. Two position, normally closed hot water valves (10 VA max) are wired to FAN/1 for single duct sequences and 1/2 for fan-powered sequences. Jumper J1 must be intact to properly operate reheat for single duct sequences. Figure 8 Silicon Contolled Rectifier (SCR) Proportional Reheat Control The TITUS TA1 provides sequencing for one stage of proportional heat. Hot water valves with 0-10 VDC control signals (10 ma max) are wired with (+) to terminal T2 on the thermostat and (-) to terminal on the controller. (See Figure 6) Thermostat Calibration Thermostats are factory calibrated to specified flow limits. If field adjustments are necessary, desired limit control can be calculated using Table 1 and the following formulas, or Figures 4 and 5. CFM = K[(0.1171 VDC) - 0.016] A digital DC voltmeter, allen wrench (1/16 in.), flat blade screwdriver (1/16 in. or 2 mm), and thermostat calibration cable (TITUS P/N 100310-01) are recommended to perform these procedures. Remove thermostat cover by turning set screws inward to retract. (As shown in Figure 8.) Always set minimum flow limits before setting maximum flow limits. Voltages corresponding to desired flow limits are read on a voltmeter by plugging the calibration cable into the outermost meter taps on the face of the thermostat. (As shown in Figure 7.) Heating is on the left, cooling on the right. VDC = {[CFM + (K X 0.016)]/(K X 0.1171)} 6
Section 1 - General Information Move thermostat slider full right. Adjust COOLING MIN until voltmeter (connected to the meter taps on the cooling side outer taps) reads VDC corresponding to desired minimum flow volume from Page 2. Move thermostat slider full left. Adjust COOLING MAX until voltmeter reads VDC corresponding to desired maximum flow volume from Page 2. Move thermostat slider back and forth to verify flow settings. Set thermostat slider to room temperature setpoint. slider full right. Adjust COOLING MIN until voltmeter reads VDC corresponding to desired minimum flow volume from Page 2. Move thermostat slider full left. Adjust COOLING MAX until voltmeter reads VDC corresponding to desired maximum flow volume from Page 2. Move left thermostat slider full left. Adjust HEATING MIN until voltmeter reads VDC corresponding to desired minimum flow volume from Table A, B, and C. Move left thermostat slider full right. Adjust HEATING MAX/AUX until voltmeter reads VDC corresponding to desired maximum flow volume from Table A, B, and C. Move thermostat sliders back and forth to verify flow settings. Set thermostat sliders to room temperature setpoints. Optional Morning Warm-Up (MWU) Operation Check-Out Procedure SINGLE DUCT TERMINAL UNITS WITHOUT REHEAT Thermostat Calibration Procedure If this option has been ordered, the unit damper will drive full open regardless of flow limit settings whenever supply air temperature is above 80 F. Check-Out Procedure Move thermostat slider full right. After a few minutes check to see that unit has reached minimum flow limit. Move thermostat full left. After a few minutes check to see that unit has reach maximum flow limit. Set thermostat slider back to room temperature setpoint. SINGLE DUCT TERMINAL UNITS WITH REHEAT Thermostat Calibration Procedure Right thermostat slider is the cooling setpoint used to control damper operation. Left thermostat slider is the heating setpoint used to control reheat operation. Move right thermostat slider full right. Move left slider full left. Adjust COOLING MIN until voltmeter (connected to the meter taps on the cooling side outer taps) reads VDC corresponding to desired minimum flow volume from Page 2. Move right thermostat slider full left. Adjust COOLING MAX until voltmeter reads VDC corresponding to desired maximum flow volume from Page 2. Move left thermostat slider full right. Adjust HEATING MAX/AUX until voltmeter (connected to the meter taps on the heating side outer taps) reads VDC corresponding to desired auxiliary flow volume from Page 2. (Note: Auxiliary Flow Limit is disabled by adjusting full counter-clockwise. When used, Auxiliary Flow Limit must be set higher than Cooling Minimum Flow Limit). Move thermostat sliders back and forth to verify flow settings. Set thermostat sliders back to room temperature setpoints. Check-Out Procedure With primary fan system supplying cold air (below 70 F), move right thermostat slider full right. After a few minutes check to see that unit has reached minimum flow limit. Move right thermostat slider full left. After a few minutes check to see that unit has reached maximum flow limit. With primary fan system supplying hot air (above 80 F), move left thermostat slider full left. After a few minutes check to see that unit has reached minimum flow limit. Move left thermostat slider full right. After a few minutes check to see that unit has reached maximum flow limit. Set thermostat sliders back to room temperature setpoints. Important Operational Note To guarantee proper autochangeover operation, it is recommended that minimum flow limits are used for both heating and cooling modes. This allows airflow to constantly pass through the unit for accurate supply air temperature measurement. FAN POWERED TERMINAL UNITS WITHOUT HEAT Thermostat Calibration Procedure Move thermostat slider full right. Adjust COOLING MIN until voltmeter (connected to the meter taps on the cooling side outer taps) reads VDC corresponding to desired minimum flow volume from Page 2. Optional Morning Warm-Up (MWU) Operation If this option has been ordered, the unit damper will drive full open regardless of flow limit settings whenever supply air temperature is above 80 F. Optional Night Shutdown (NSD) Operation Move both thermostat sliders full left. After a few minutes check to see that unit has reached maximum flow limit with reheat off. Move right thermostat slider full right. After a few minutes check to see that unit has reached minimum flow limit with reheat off. Slowly move left thermostat slider full right. If auxiliary flow limit has been disabled, reheat stages should energize immediately. If auxiliary flow settings have been made, allow several minutes for reheat to energize. Set thermostat sliders back to room temperature setpoints. Units ordered with optional night shutdown (NSD) sequences employ a differential pressure switch to sense loss of supply duct static pressure. By this method, these units change operating mode when the air handler fan is de-energized. If this option has been ordered, the unit fan will de-energize whenever the air handler unit (AHU) is off. If a minimum flow limit has been set at the thermostat, the unit damper will drive full open. SINGLE DUCT TERMINAL UNITS WITH HEATING/COOLING AUTOCHANGEOVER(ACO) Units ordered with optional night setback (NSB) sequences employ a differential pressure switch to sense loss of supply duct static pressure. By this method, these units change operating mode when the air handler fan is de-energized. If this option has been ordered, the unit fan will operate intermittently to maintain a temperature setpoint approximately 10 F below the thermostat setting whenever the air handler unit (AHU) is off. If a minimum flow limit has been set at the thermostat, the unit damper will drive full open. Thermostat Calibration Procedure Right thermostat slider is the cooling setpoint used to control damper operation when supply air is below 70 F. Left thermostat slider is the heating setpoint used to control operation when supply air is above 80 F. Move right thermostat Optional Night Setback (NSB) Operation 7
IOM TA1/TA2 C O N T R O L L E R Section 1 - General Information Check-Out Procedure (Day/Occupied Mode) TROUBLESHOOTING PROCEDURES Fan should be energized regardless of slider position on series fan-powered units (ATQS/AFLS). Move thermostat slider full right to energize fan on parallel fanpowered units (ATQP/AFLP). Move slider full left. After a few minutes check to see that unit has reached maximum flow limit. Move slider full right. After a few minutes check to see that unit has reached minimum flow limit. Set thermostat slider back to room temperature setpoint. NOTE: TURN OFF POWER BEFORE MAKING ANY WIRING CHANGES TO THE UNIT FOR TROUBLE SHOOTING Check-Out Procedure (Night/Unoccupied Mode) Move thermostat slider full right to energize fan. FAN POWERED TERMINAL UNITS WITH HEAT Thermostat Calibration Procedure Right thermostat slider is the cooling setpoint used to control damper operation. Left thermostat slider is the heating setpoint used to control reheat operation and sequenced fan operation. Move right thermostat slider full right. Adjust COOLING MIN until voltmeter (connected to the meter taps on the cooling side outer taps) reads VDC corresponding to desired minimum flow volume from Page 2. Move right thermostat slider full left. Adjust COOLING MAX until voltmeter reads VDC corresponding to desired maximum flow volume from Page 2. Adjust HEATING MIN fully counter clockwise (CCW). Adjust HEATING MAX/AUX fully clockwise (CW). Move right thermostat slider back and forth to verify flow settings. Set thermostat sliders to room temperature setpoint. To Check Operation of Controller s Damper Output Circuit and Actuator Disconnect wire from terminal T1 on controller and put a wire nut on it. If unit is equipped with morning warm-up or autochangeover, disconnect wire from terminal Y on controller and put a wire nut on it. Connect a jumper wire between terminals 16 VDC and T1, and observe actuator driving damper full open. Move jumper wire to connect terminals and T1, and observe actuator driving damper full closed. Remove jumper wire and reconnect wires to terminals T1 and Y. If an Actuator Appears to be Inoperative Check to see if the damper blade is free to move and that the actuator gears are engaged. Press in the red linkage release button on the actuator. It should be possible to turn the actuator collar whenever this button is held down. After releasing the button always check to make sure the collar is properly engaged by attempting to turn it by hand. No movement should be possible when the button is released. To Check Operation of Controller s On/Off Reheat Output Circuit Disconnect wire from terminal TX REHEAT and put a wire nut on it. Connect a jumper wire between terminals 16 VDC and TX REHEAT and observe that all heat stages are energized. Optional Night Shutdown (NSD) Operation If Reheat Stages are On When They Should be Off Units ordered with optional night shutdown (NSD) sequences employ a differential pressure switch to sense loss of supply duct static pressure. By this method, these units change operating mode when the air handler fan is de-energized. If this option has been ordered, the unit fan will de-energize whenever the air handler unit (AHU) is off. This will effectively lock-out all heat operation. If a minimum flow limit has been set at the thermostat, the unit damper will drive full open. Check the RA/DA jumper on controller to see if position matches that shown on unit wiring diagram. Whenever replacement controllers are installed it is necessary to locate the jumper in the correct position. If jumper is correctly installed on a fan powered unit but problems persist, recalibrate heating side of thermostat. Optional Night Setback (NSB) Operation Units ordered with optional night setback (NSB) sequences employ a differential pressure switch to sense loss of supply duct static pressure. By this method, these units change operating mode when the air handler fan is de-energized. If this option has been ordered, the unit fan and heat will operate intermittently to maintain a temperature setpoint approximately 10 F below the thermostat heating setpoint whenever the air handler unit (AHU) is off. If a minimum flow limit has been set at the thermostat, the unit damper will drive full open. Check-Out Procedure (Day/Occupied Mode) Fan should be energized regardless of slider position on series fan powered units (ATQS/AFLS). Move left thermostat slider full right to energize fan on parallel fan powered units. (ATQP/AFLP). Move both sliders full left. After a few minutes check to see that unit has reached maximum flow limit with reheat off. Move right slider full right. After a few minutes check to see that unit has reach minimum flow limit with heat off. Move left slider full right to energize heat. Set thermostat sliders back to room temperature setpoints. If Desired Thermostat Voltage Settings Cannot be Achieved Make sure that minimum flow limit setting is made prior to setting maximum flow limit setting. If procedures are followed correctly and problem persists, thermostat will need to be replaced. If a thermostat slider has ever been removed and replaced this problem is likely to occur. This happens when a slider is incorrectly indexed on the geared wheel that it operates, resulting in temperature scaling error. If Voltage Readings Float or Appear to be Unstable During Thermostat Calibration Check to make sure that the wire connecting on the thermostat to on the controller is tight and properly connected. This is the reference ground wire for the regulated 16 VDC thermostat supply output. A loose connection will result in unstable readings due in part to atmospheric static electricity. If Unit Fan Runs Intermittently During Day/Occupied Operation on a Series Fan Powered Terminal Check the J1 jumper on controller to see if it has been cut. When this jumper is cut and removed, fan will run continuously for Day/Occupied mode. This jumper should be left intact for all applications other than series fan powered terminals. Check-Out Procedure (Night/Unoccupied Mode) Move thermostat slider full right to energize fan and reheat. 8
Section 1 - Parts/Part Numbers Description Vendor Part # TITUS Part # Controllers and Actuators TITUS TA1 Controller (5 outputs - handles all applications) CSE-5111 10303201 TITUS TA2 Controller (2 outputs) CSE-5112 10303301 TITUS Actuator, 24V MEP-5001 10268101 Room Thermostats and Accessories Cooling Only (AESV/AECV/AQCV/ATQS/ATQP/AFLS/AFLP) CTE-5101 10269601 Heating/Cooling Autochangeover (AESV/AECV) CTE-5103 10269603 Cooling with Reheat/Aux Heat (AESV/AECV/AQCV) CTE-5104 10269604 Cooling with Reheat/Aux Heat (ATQS/ATQP/AFLS/AFLP) CTE-5103 10269603 Cooling with Proportional Reheat (AESV/AECV/AQCV) CTE-5104 10269604 Cooling with Proportional Reheat (ATQS/ATQP/AFLS/AFLP) CTE-5103 10269603 Thermostat Sheetrock Mounting Bracket HMO-5023 10307301 Thermostat Surface Mount Sub-Base HMO-5030 10307401 Thermostat Calibration Cable HSO-5001 10031001 Transformers 24V to 24V 10166601 120V to 24V 10005801 208/240V to 24V 10057501 277V to 24V 10006601 480V to 24V 10100301 Miscellaneous Duct Temperature Sensor 10306501 Constant Volume Module (ZECV/ZQCV) REE-1004 10171101 Air Flow Switch (Night Setback/Night Shutdown) 10269501 Fan Relay (24V, SPST Contacts) 10156901 Switching Relay (24V, DPDT Contacts) (Night Setback) 10161801 Toggle Disconnect Switch 10027801 Proportional Reheat Water Valves (Analog Controls) Actuator with Valve Body, 1/2, Cv = 0.7, Two-Way Actuator with Valve Body, 1/2, Cv = 0.7, Three-Way Actuator with Valve Body, 1/2, Cv = 1.5, Two-Way Actuator with Valve Body, 1/2, Cv = 1.5, Three-Way Actuator with Valve Body, 3/4, Cv = 2.5, Two-Way Actuator with Valve Body, 3/4, Cv = 2.5, Three-Way 0691P0281EA00 0691P0291EA00 0691P0282EA00 0691P0292EA00 0691P0283EA00 0691P0293EA00 10307501 10307502 10307503 10307504 10307505 10307506 On/Off Reheat Water Valves Actuator, 24V MEP3001 10156001 Valve Body, 1/2, 2.0 Cv, Two-Way VFP-111301 10155401 Valve Body, 3/4, 2.9 Cv, Two-Way VFP-111701 10155403 Valve Body, 1/2, 1.7 Cv, Three-Way VFP341901 10155405 Valve Body, 3/4, 4.9 Cv, Three-Way VFP342001 10155406 - must include Valve Nipple (3 required) 10186001 9
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