PROPORTIONAL BAND ZERO ENERGY BAND DEFINITION S1 S2

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Jeffrey Charles
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Honeywell T0C INDIVIDUAL ROOM TEMPERATURE CONTROLLER INSTALLATION

mm (max) Remote Temperature Sensor Screen wire 0 Connect screen wire

SWITCHES ON OFF ON CONTROL SYSTEM PROPORTIONAL BAND ZERO ENERGY BAND

Thermo-Electric OFF ON Actuator (TPM) On / Off ON OFF Modulating ON ON

Cooling -Stage Cooling + ON OFF -Stage On/Off Heating K ON ON ON K ON

1 Honeywell T0C INDIVIDUAL ROOM TEMPERATURE CONTROLLER INSTALLATION GUIDE Cover removal Mounting T0C R Wiring T0C.mm (max) Remote Temperature Sensor Screen wire 0 Connect screen wire to terminal or 0 ON System Switches SYSTEM & PARAMETER SELECTION SWITCHES ON OFF ON CONTROL SYSTEM PROPORTIONAL BAND ZERO ENERGY BAND DEFINITION S S DEFINITION S S Xp (system dependent) S S S ZEB S Thermo-Electric OFF ON Actuator (TPM) On / Off ON OFF Modulating ON ON Heat / Cool Changeover OFF OFF -Stage Heating + OFF ON -Stage On/Off Cooling -Stage Cooling + ON OFF -Stage On/Off Heating K ON ON ON K ON ON OFF K OFF OFF ON OFF ON ON ON OFF ON K K ON OFF Heat + Cool Sequence ON ON K OFF OFF OFF OFF ON OFF ON OFF OFF

2 MODULATING CONTROL Up to x M0C actuators (0.VA each) can be connected to each output. Maximum rating of On/off output is 00mA. A V~ contactor or relay must be used to switch higher current or voltage loads.

3 ON/OFF CONTROL Maximum rating of On/off output is 00mA. A V~ contactor or relay must be used to switch higher current or voltage loads.

4 TPM CONTROL (THERMO-ELECTRIC ACTUATORS) Maximum rating of On/off output is 00mA. A V~ contactor or relay must be used to switch higher current or voltage loads.

5 LAYOUT & TERMINAL CONNECTIONS Terminals Potentiometer System Switches Sensor Diagnostic LED. volt supply. volt supply (0v). Valve open. Valve close. Valve common. Valve open / stage on/off control (applications,,,0,,). Valve close / stage on/off control (applications,,,0,,). Heat / Cool changeover input. Heat / Cool changeover input 0. Energy savings input. Energy savings input. Remote sensor input. Remote common (for remote sensor & remote setpoint inputs). Remote setpoint input All terminals are suitable for connection of up to.mm stranded cable. STARTUP & COMMISSIONING SEQUENCE On power up, T0C will undergo a test and synchronisation sequence to enable Installers and Commissioning Engineers to test the system is wired correctly. Test Sequence For all control modes, the test sequence will last 0 seconds, and will consist of switching the control outputs on and off in the sequence illustrated below. The outputs are connected to terminals,,, and. Valve Synchronisation For modulating systems, the test sequence will be followed by a valve synchronisation (taking approximately minutes), where the valves will be driven to the closed position to establish a baseline control reference. For On/off and TPM control systems, the valve closure sequence will last 0 seconds. The synchronisation sequence will be repeated hours after power up, and thereafter every hours. The Diagnostic LED will illuminate in the sequence illustrated for Terminal below, if no faults are detected (see Section entitled Diagnostics & Fault Indication for a complete description). On/off & TPM Systems Terminal Close Valves Terminal Terminal Terminal (secs) Normal Control Only applies for On/off Heat + Cool Sequence system 0 Modulating Systems Terminal Terminal Terminal Close Valves (min approx.) Normal Control Terminal (secs)

6 DIAGNOSTICS & FAULT INDICATION T0C provides simple user diagnostics and fault indication using an LED, positioned at the bottom right side of the printed wiring board. The T0C cover can be removed to view the LED correctly. By pulsing the LED on and off in predefined sequences, T0C is able to indicate valve position, heating or cooling demand, or whether a fault has been detected. The tables and graphs opposite illustrate how to interpret the LED outputs. Fault Indication If a fault is detected, this will be indicated as a higher priority than valve position or cooling / heating demand. Faults are indicated by,, or LED pulses, followed by a second delay, then a repeat of the pulse sequence. Most detectable faults are associated with errors in reading sensor or setpoint values. In the unlikely event of an internal sensor or unit setpoint fault, the only option is to replace the complete controller. However, if a remote sensor fault is indicated, the most likely reason is a bad connection, so all wiring connections should be checked and re-made if necessary. Internal Sensor Remote Sensor Unit Fault Indication 0 0 Fault Internal Sensor out of range Remote Sensor out of range Faulty setpoint measurement Suggested Action Replace controller Check sensor connections Replace controller (secs) Diagnostics Valve Position / Cooling or Heating Demand Valve position or cooling/heating demands are indicated by an initial code sequence of pulses, followed by the position or demand data, and this is repeated on a fixed cycle rate. The duration of the data pulse provides the important information, for example : Valve position : LED on for a duration proportional to the valve position, where 0s on = valve fully open On/off or TPM demand : LED on for an amount proportional to the on period of the cycle, where 0s on = 0 demand T0C will only provide demand or position data on the current operating output, and this will be indicated by the initial pulse sequence of,, or pulses. By reference to the table, the current operating mode and demand can be determined for each of the possible control options. Valve position / Demand Valve position / Demand Valve position / Demand Output Type 0 0 (secs) Output Type 0 0 (secs) Output Type 0 0 (secs) Modulating Control On/off Control TPM Control 0 Valve closed Valve closed Valve Position Modulating Cooling Valve closed Valve closed Valve Position Modulating Heating nd Stage On/off Heating demand st Stage On/off Heating demand Valve Position Modulating Cooling+ On/off Heating nd Stage On/off Cooling demand st Stage On/off Cooling demand Valve Position Modulating Heating+ On/off Cooling Valve closed Valve Position (Cooling Operation) Valve Position (Heating Operation) Modulating Heat / Cool Changeover Valves closed Position of Cooling Valve Position of Heating Valve Modulating Cool + Heat Sequence Valve closed Valve closed Valve Demand On/off Cooling Valve closed Valve closed Valve Demand On/off Heating nd Stage On/off Heating demand st Stage On/off Heating demand Valve Demand On/off Cooling+ -Stage On/off Heating nd Stage On/off Cooling demand st Stage On/off Cooling demand Valve Demand On/off Heating+ -Stage On/off Cooling Valve closed Valve Demand (Cooling Operation) Valve Demand (Heating Operation) On/off Heat / Cool Changeover Valves closed Cooling Valve Demand Heating Valve Demand On/off Cool +Heat Sequence Valve closed Valve closed Valve Demand TPM Cooling Valve closed Valve closed Valve Demand TPM Heating nd Stage On/off Heating demand st Stage On/off Heating demand Valve Demand TPM Cooling+ -Stage On/off Heating nd Stage On/off Cooling demand st Stage On/off Cooling demand Valve Demand TPM Heating+ -Stage On/off Cooling Valve closed Valve Demand (Cooling Operation) Valve Demand (Heating Operation) TPM Heat / Cool Changeover Valves closed Cooling Valve Demand Heating Valve Demand TPM Cool +Heat Sequence

7 ENERGY SAVINGS MODE T0C has an Energy Management System, where the detection of an external input signal will cause the cooling and heating setpoints to change to pre-defi ned setup and setback temperatures, enabling maximum energy effi ciency. This input signal must be in the form of a contact closure, connected to terminals 0 and. In Mode the Setup/Setback values can be set between -K by means of an on-board potentiometer. In cooling only systems (,, ) the setpoint will be increased (setup) by the set value fi xed by the potentiometer. In heating only systems (,, ) the setpoint will be decreased (setback). In heat/cool changeover systems (,, ) the heating setpoint will be decreased in heating mode, and the cooling setpoint will be increased in cooling mode. In cooling + heating systems (,,,, 0,,,, ) the cooling setpoint will be increased by the set value and the heating setpoint will be decreased by the same amount. The effect is to widen the Zero Energy Band. Input Wiring Connections T0C 0 Switch should be rated 0 Vdc 0. ma nominal = Normal Operation = Mode ENERGY SAVINGS : EXAMPLES () Modulating Cooling Potentiometer 0 Valve position Setting K Cooling = Normal Cooling + Cooling Setup = Normal Cooling + K Example: Setup value = k Normal Temp ( C) () Modulating Heating Potentiometer 0 Valve position Setting K Heating = Normal Heating - Heating Setback = Normal Heating - K Example: Setback value = k Normal Temp ( C) () Modulating Cooling +Heating Sequence ZEB Potentiometer 0 Valve position Normal Heating Normal ZEB Normal Cooling ZEB = Normal ZEB + Heating Setback + Cooling Setup = K + K + K = K Temp ( C) Example: Setup/setback value = k Heating Cooling

8 REMOTE SETPOINT ADJUSTMENT T0C allows its setpoint to be adjusted remotely by up to ±K. This is achieved by the connection of a Remote Adjustment module to terminals and, as shown in the wiring schematic. Suitable modules are : QB0 (Remote Adjust), and QC0 (Sensor + Remote Adjust). To ensure measurement stability when wiring these modules, use screened cable, and connect the screen wire to terminal or 0 of the T0C, as shown. QB0 REMOTE SETPOINT ADJUST T0C 0 QB0 Use screened cable Screen wire QC0 SENSOR + REMOTE SETPOINT ADJUST T0C QC0 0 Use screened cable Screen wire REMOTE SENSOR T0C is supplied with an on-board temperature sensor. If remote temperature sensing is required (for example in return air sensing applications), then a suitable Honeywell Remote Sensor can be connected to terminals and as shown in the wiring schematics. T0C auto detects the Remote Sensor on power up, and will use the Remote Sensor measurement in preference to its internal sensor. The power must be switched off then on again for a remote sensor to be detected. Remote Sensors are available as wall-mounted or airfl ow (return air) models : T0C00 Airfl ow Sensor supplied with. m cable QA00 Wall-mounted Sensor QC0 Wall-mounted sensor + Remote Adjust All Remote Sensors require screened cable to be used to ensure stability of temperature measurement. The screen wire must be connected to terminal or 0 of T0C, as shown. If this cable is to be extended then the maximum cable run will be 0m, and the extension must also use screened cable. T0C 0 T0C00 SENSOR T0C00 Use screened cable Screen wire QA00 WALL-MOUNTED SENSOR T0C QA00 0 Use screened cable Screen wire AUTOMATIC HEAT / COOL CHANGEOVER If automatic or central Heat / Cool changeover is required, set both system switches S and S to the off position (see page ). Automatic changeover is initiated by a thermostat positioned on the water fl ow pipe, detecting the presence of heated or chilled water, and sending the appropriate signal to the controller. A suitable product is the S0A00 pipe-thermostat. Central changeover is initiated by a switch, and can be used to centrally switch a group of connected T0C controllers from Heating to cooling operation. See wiring schematics for connection details. Automatic Heat / Cool Changeover T0C 0 S0A00 Central Heat / Cool Changeover T0C T0C T0C Central Switch = Heating = Cooling VALVES, ACTUATORS & OPTIONAL ACCESSORIES Optional Accessories A range of optional accessories are available for use with T0C : F00-00 Range stops F00-00 Wall-plate Q0A0 Fan Speed Switching Subbase QA00 Wall mounted Remote Sensor QB0 Remote Adjust Unit (±K) QC0 Sensor + Remote Adjust Unit (±K) T0C00 Return Air Sensor (.m cable) S0A00 Pipe-mounted Changeover Thermostat Environmental Controls Honeywell Control Systems Ltd. Newhouse Industrial Estate Motherwell, ML SB Scotland honeywell R

T8078C LOW VOLTAGE MODULATING CONTROLLER FEATURES APPLICATIONS PRODUCT SPECIFICATION SHEET

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