User manual HONEYWELL T8078C

[. . . ] A 24V~ contactor or relay must be used to switch higher current or voltage loads. 3 TPM CONTROL (THERMO-ELECTRIC ACTUATORS) Maximum rating of On/off output is 300mA. A 24V~ contactor or relay must be used to switch higher current or voltage loads. 4 LAYOUT & TERMINAL CONNECTIONS Terminals 1. Sensor Diagnostic LED All terminals are suitable for connection of up to 1. 5mm2 stranded cable. [. . . ] 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 1, 2, or 3 LED pulses, followed by a 6 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. Fault Internal Sensor out of range Remote Sensor out of range Faulty setpoint measurement Suggested Action Replace controller Check sensor connections Replace controller Fault Indication Internal Sensor Remote Sensor Unit Setpoint 0 1 2 3 4 5 6 7 8 Time 9 10 11 12 13 14 15 16 17 (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 10s on = valve fully open Modulating Control 1 2 3 4 5 6 7 On/off Control 8 TPM Control 9 10 11 12 13 14 15 16 17 18 On/off Cooling+ 2-Stage On/off Heating On/off Heating+ 2-Stage On/off Cooling TPM Cooling+ 2-Stage On/off Heating TPM Heating+ 2-Stage On/off Cooling Valve Demand 1st Stage On/off Cooling demand 2nd Stage On/off Cooling demand Modulating Cooling+ On/off Heating Modulating Heating+ On/off Cooling Modulating Heat / Cool Changeover Modulating Cool + Heat Sequence On/off Heat / Cool Changeover On/off Cool +Heat Sequence TPM Heat / Cool Changeover Valve Demand (Heating Operation) Valve Demand (Cooling Operation) Valve closed T8078C will only provide demand or position data on the current operating output, and this will be indicated by the initial pulse sequence of 1, 2, or 3 pulses. By reference to the table, the current operating mode and demand can be determined for each of the 18 possible control options. Output Type 1 Valve position / Demand 0% Modulating Heating Modulating Cooling On/off or TPM demand : LED on for an amount proportional to the on period of the cycle, where 10s on = 100% demand Valve Demand (Heating Operation) Valve Position (Heating Operation) Position of Heating Valve Heating Valve Demand 10% 50% 90% 100% 0 1 2 3 4 5 6 7 8 Time 9 10 11 12 13 14 15 16 17 (secs) Valve Demand (Cooling Operation) Valve Position (Cooling Operation) 1st Stage On/off Heating demand 1st Stage On/off Heating demand 1st Stage On/off Heating demand 1st Stage On/off Cooling demand 1st Stage On/off Cooling demand Output Type 2 Valve position / Demand 0% Position of Cooling Valve Cooling Valve Demand 10% 50% 90% 100% 0 1 2 3 4 5 6 7 8 Time 9 10 11 12 13 14 15 16 17 (secs) 2nd Stage On/off Heating demand 2nd Stage On/off Heating demand 0% 2nd Stage On/off Heating demand 2nd Stage On/off Cooling demand 2nd Stage On/off Cooling demand Output Type 3 Valve position / Demand Valves closed Valves closed 10% 50% 90% 100% 0 1 2 3 4 5 6 7 8 Time 9 10 11 12 13 14 15 16 17 (secs) 6 Valves closed Valve closed Valve closed Valve closed Valve closed Valve closed Valve closed Valve closed Valve closed Cooling Valve Demand Valve closed Valve closed Valve closed Valve closed Valve closed Valve closed Heating Valve Demand Valve Demand Valve Demand Valve Demand Valve Demand Valve Demand Valve Demand Valve Demand Valve Position Valve Position Valve Position Valve Position TPM Cool +Heat Sequence On/off Heating On/off Cooling TPM Heating TPM Cooling ENERGY SAVINGS MODE T8078C has an Energy Management System, where the detection of an external input signal will cause the cooling and heating setpoints to change to pre-defined setup and setback temperatures, enabling maximum energy efficiency. This input signal must be in the form of a contact closure, connected to terminals 10 and 11. In Energy Savings Mode the Setup/Setback values can be set between 2-8K by means of an on-board potentiometer. In cooling only systems (1, 7, 13) the setpoint will be increased (setup) by the set value fixed by the potentiometer. In heating only systems (2, 8, 14) the setpoint will be decreased (setback). In heat/cool changeover systems (5, 11, 17) the heating setpoint will be decreased in heating mode, and the cooling setpoint will be increased in cooling mode. In cooling + heating systems (3, 4, 6, 9, 10, 12, 15, 16, 18) 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 T8078C 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Switch should be rated 30 Vdc 0. 5 mA nominal = Normal Operation = Energy Savings Mode ENERGY SAVINGS : EXAMPLES (1) Modulating Cooling Energy Savings Potentiometer 4 3 2 5 6 7 8 Energy Savings Setting 4K 100% Valve position Energy Savings Cooling Setpoint = Normal Cooling Setpoint + Cooling Setup = Normal Cooling Setpoint + 4K 0% Temp (°C) Example: Setup value = 4k Normal Setpoint Energy Savings Setpoint (2) Modulating Heating Energy Savings Potentiometer 4 3 2 5 6 7 8 Energy Savings Setting 4K 100% Valve position Energy Savings Heating Setpoint = Normal Heating Setpoint - Heating Setback = Normal Heating Setpoint - 4K 0% Temp (°C) Example: Setback value = 4k Energy Savings Setpoint Normal Setpoint (6) Modulating Cooling +Heating Sequence 100% Valve position Energy Savings ZEB Normal ZEB Energy Savings ZEB Normal Heating Normal Cooling Energy Savings Potentiometer 4 3 2 5 6 7 8 = Normal ZEB + Heating Setback + Cooling Setup = 2K + 2K + 2K = 6K 0% Temp (°C) Example: Setup/setback value = 2k Energy Savings Heating Setpoint Energy Savings Cooling 7 REMOTE SETPOINT ADJUSTMENT T8078C allows its setpoint to be adjusted remotely by up to ±5K. [. . . ] The screen wire must be connected to terminal 9 or 10 of T8078C, as shown. If this cable is to be extended then the maximum cable run will be 20m, and the extension must also use screened cable. T8109C1002 SENSOR T8078C 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Q979A1020 WALL-MOUNTED SENSOR T8078C T8109C1002 Use screened cable Screen wire 14 13 12 11 10 9 8 7 6 5 4 3 2 1 14 Q979A1020 13 12 Use screened cable Screen wire AUTOMATIC HEAT / COOL CHANGEOVER If automatic or central Heat / Cool changeover is required, set both system switches S3 and S4 to the off position (see page 1). Automatic changeover is initiated by a thermostat positioned on the water flow pipe, detecting the presence of heated or chilled water, and sending the appropriate signal to the controller. [. . . ]