Bravo Tstat8 Colling or Heating Thermostat User Manual

This is the Modbus address of the state. It is the address to which the stat will respond when receiving serial communication.

Temperature Calibrate

To calibrate the temperature shown non the display you will need a handheld mercury thermometer or digital thermometer. Hold the meter close to the thermostat and allow it to come to equilibrium. Use the keypad to get into the menu mode until CAL is shown on the display. Now you can adjust the display using the up and down buttons till the temperature show matches the handheld meter. When you are done, just let the display time out to normal operation, and the display will stop. ashing and will show the current room temperature. You can repeat this sequence if necessary till the readings on the thermostat and meter agree. The thermostat ill store the outages and should not need to be adjusted for many years. The main point to keep in mind when calibrating is to let everything come to equilibrium. The thermostat should be power ed up for 5 minutes prior to any calibration and the thermometer should be left near the thermostat for about the same amount of time.

The calibration value is centered around 500 (50.0°) This means that anything above 500w will be added on to the raw temperature and anything below 500 will be subtracted from the raw temperature. Calibration units are in increments of 0.1° (i.e. 500 means 50.0°) and are in the same units (Cor F) as the state.

Some calibration tips:

*The main error in calibration comes from not waiting for enough for the handheld thermometer to come to equilibrium.

*Calibrate using the customer’s thermometer, even if it is not an accurate one so that all subsequent measurements are compared to the same benchmark.

*The sensor inside the thermostat is a digital chip capable of resolving down to 0.06°C so thew backlink in calibrating is usually the procedure used rather than the state accuracy.

*Make sure the stat is mounted in a location free of drafts.

Temperature Select

The state has an extra input for use with an external temp sensor.

tSS = 0: The state will use the internaltemperaturesensorICfor the display and PID calculations

tSS = 1: The state will use an external thermistor which is shown on the display and used for PID calculations. tSS = 2: The state will use an internal thermistor hichis show on the display and used for PID calculations.

tSS = 3: The state will use an average of internal the ristorante’s external history which is shown on the display and used for PID calculations.

Filter used for the raw temperature being read by the sensor.

This configures the weight raw temperature. corresponds to no filter.10 corresponds to a high level of filtering. Set this to a low value if you want the input to respond quickly,a high value ill smooth the readings more but make them respond more slowly.

This parameter adjusts the delay between cycling of the mode of operation. It is the number of minutes after entering coasting mode until the tstat can reenter the mode it came from. For example, if the state is in Cooling1 mode, and then enters Coasting mode, it will take a delay,dSCminutes, until it can re-enter into Cooling1 mode. This value is in increments of 1 min.

This parameter adjusts the delay between switching from a heating mode of operation to a cooling mode of operation or vice versa. It is the number of minutes after leaving cooling or heating mode before the state can enter the opposite mode. This value is in increments of 1 min.

The proportional term is the ‘P’ term of the familiar PID control strategy and determines how fast a valve will react to a deviation from setpoint at a particular instant in time. The default value of 2.0° (Cor F) is fine for most applications, where a 2.0° deviation is required to make the valve respond 100%. For example, with the PPr term set to 2.0 (°C) and the cooling setpoint set to 20°C, the valve will be open 100% by the time the room hits 22°C. A larger PPr term will make the valve lazy since the deviation from the setpoint will have to be greater before it opens 100%. A smaller value makes the valve respond more quickly. The factory setting of 2.0° (Cor F) is fine where the thermostat is located out of the direct arrow in an office size room. For a smaller room or if the thermostat is located directly under the air vent, a slower-acting valve is required to avoid short cycling, so set the value of PPr to

3.0° or 4.0°. The PPr term acts in cooperation with the PIn term which is described next. The P value is in increments of 0.1 ° (i.e. 20 means 2.0°) and is in the same units (Cor F) as the state.

Integral Term

The integral term is the ‘I’ term of the familiar PID control strategy and determines how fast the valve will react to a deviation from setpoint over time. For example with the room slightly above the setpoint, the ‘P’ term may be basically satisfied, but a small deviation still exists. This deviation is summed up or ‘Integrated’ over time and the Iterm will gradually open the valve to make up small deviations from the set- point. The default value of 5.0 (%/Degminute) is for most applications and will cause the valve to open 5% for one degree(Cor F) of error per minute. For example, when the term set to the default of 5.0 (%/Degminute), the cooling setpoint is set to 20°C, and the room temperature is 21°C, the valve will be open partially due to the “P” term described earlier but the condition continues and we would like the valve to be opening up slowly to make up the final temperature error. If this situation of 1.0°Cerrorcontinuesforone minute, the error accumulates, and the Itermnudges the valve open an additional 5%.If the previous explanation is not clear, a couple of helpful reminders are as follows think of the Iterm as the opposite of the Pterm, -” a biggerImeans faster valve,smallerImeans lazier valve”.-The default value of 5% will work fine for most applications.-If the valve is short cycling, make the I term lazier (smaller). The Ivalue is in increments

of 0.1 %/°min (i.e. 50 means 5.0%/°min) and is in the same units (Cor F) as the state.

Operation Sequence

The Sequence of operation is normally set at the factory and does not need to be adjusted. The thermostat support eld adjustment of the operation to suit different variations of mechanical equipment. Setting this value to a different value will cause the thermostat to stop working properly, so be careful not to adjust its value unless you are familiar with the various sequences.

Standard Operation:

When SOP is set to 1, the sequence of operations is stored in a table that allows for basicallyany arbitrarysequenceof operation, for example, the state could be set up to control 5 stages of cooling,5 stages of heating, or anything in between. Each output is individually assigned to be active in any particular section of the cooling or heating cycle.There are7 discreetsteps,Heat3, Heat2, Heat1, Coasting, Cool1, Cool2 and Cool3. So the table is a 5 outputs x 7 steps spreadsheet arrangement and you ?ll in the blanks to suit the application. The settings can be stored in an external text that is easily read and modified in a text editor. The “TstatFactory” software utility on our website allows you to send your favorite sequence of operation tablets o a new speeding-up configuration process.

TransducerMode:

Setting SOP to 2, puts the Tstatinto transducer mode. In this mode, the cooling analog output corresponds directly to the room temperature in degrees C(i.e. at 25°C, the output would be 2.5V). The heating analog output corresponds directly to the setpoint in degrees C. And relay1 corresponds to the occupied/unoccupied mode (occupied= relay1ON, unoccupied= relay1OFF).

TestMode:

A special sequence of operations is embedded in the state that assists in the commissioning of the installation and testing of the stats. When SOP is set to ‘0’ this is the testing sequence and the unit will cycle the relay outputs on and off in a slow rotation. The analog outputs are also cycled in a slow ramp, the cooling goes from 0-10Vw hile the heating goes in reverse from 10 to 0V. The duty cycle of this rotation is approximately 20 seconds, be sure the mechanical system is able to handle this sort of cycling before using this feature.

HeatCool Config

This item configures the method by which the state determines the heating or cooling mode.

HC = 0: mode is controlled automatically by the PID. PID > 52 is the heating mode, PID < 48 is the cooling mode.

HC = 1: mode is controlled by the keypad or serial communication. This is for keypad con? durations in w which the user serial com can manually set heating or cooling.

HC = 2: mode is controlled by the active high digital input. High is heating, and low is cooling. HC = 3: mode is controlled by the active-low digital input. High is cooling, low is heating.

HC = 4: mode is controlled by the difference in temperature of the setpoint and analog in1 sensor. If the temperature of the sensor is greater than the setpoint, the state will be in cooling mode, and if the temperature of the sensor is less than the setpoint, the state will be

in heating mode. This is primarily used for2-pipe systems.

HC = 5: same as mode 4, but using the analog in2 sensor instead of analogin1.

If there is one setpoint, the heating set point follows the cooling set point and is calculated by: Heating Setpoint = Setpoint – Heating Deadband.

Cooling Setpoint = Setpoint + Cooling Deadband

If there are two set points, heating, and cooling are separately adjusted.  The setpoints are calculated as follows: Heating Setpoint = Max( Cooling Setpoint + Cooling Deadband , Heating Setpoint )

Cooling Setpoint = Min( Cooling Setpoint, Heating Setpoint – Cooling Deadband)

The min value for Cdb is 1.0° (Cor F) to ensure that simultaneous heating and cooling are never allowed. The maximum value is arbitrarily set to 20.0°. The deadband values are in increments of 0.1° (i.e. 20 means 2.0°) and are in the same units (Cor F) as the state.

The display can be switched to show Degrees Cor Degrees F. 0 = C, 1 = F.

The number of fan speeds allowed. Fan = 3, user w ill see “Off,-1-, -2-,-3-, Aut” Fan = 2, user will see “Off,-1-, -2-, Aut” Fan = 1, user will see “Off,-1- , Aut”, Fan = 0, user will see “Off, On”

When the state is in unoccupied mode, and APP is set to 0, the heating setpoint is adjusted downwards by the amount of the nHd. The cooling setpoint is adjusted upwards by the amount of nCd. The night deadband values are in increments of 1°

(i.e. 10 means 10°) and are in the same units (Cor F) as the state.

Note: The night heating setpoint is prevented through an internal soft are interlock from being set below 5°C, regardless of the user heating setpoint and the value stored in NHS.

0  – OFFICE applications mode

The night time setpoints respected value Night Heating Setpoint = nHS value.

Night Cooling Setpoint = nCS value.

1  – HOTEL or RESIDENTIAL applications mode

The nighttime setpoints area in relation to the daytime setpoints Night Heating Setpoint = Cooling Setpoint – nHd value.

Night Cooling Setpoint = Cooling Setpoint + nCd value.

PowerUp Setpoint

Certain applications require the thermostat to power up with a known setpoint that is stored through a power outage. This feature is useful in some of the transducer modes where the central DD Ccontroller can cycle the power to the thermostats to reset the room setpoints to a known value every day. The power on setpoint value is in incrementsof1° (i.e. 20 means 20°) and is in the same units (Cor F) as the state.

PowerUp On/Off

This setting allows the thermostat to power up in one of three modes: 0 = power off,1 = power up in on mode, 2 = last value (default),3 =auto mode. The on and off settings are self-explanatory and are useful in certain DDC applications where the central controller can cycle the power to each thermostat to sweep the moff each evening for example. The default value is the “last value” and will cause the thermostat to power up in whatever state it was in before the power outage.

AnalogOut1 Setting AnalogOut2 Setting

Sets the full-scale voltage of the analog outputs. Ou1 sets analog out 1 (Cooling). Ou2 sets analog out 2 (Heating). This setting is used to match the analog outputs to various types of actuators, transducers or other controllers.For example, by setting the output range to act over a 5VDC scale you can set the start up as a transducer to interface into a master DDC controller.Or perhaps you have a valve that operates over the 2-10VDCrange, this ‘output’ type setting lets you tailor the tstat to the particular application. OuX = 0, the output will act in on/off mode.

There are 4 types of stats. Only the Tstat5Aand Tstat5CMhave analog output capability.

For Tstat5Band Tstat5C, the firmware recognizes the relay and this will be permanently set to 0 and is not adjustable.

For Tstat 5 and Tstat5CM with analog outputs, the output will be 0V when OFF and 10V when ON. This is useful only if you hap- pen to have a Tstat5Aor5CM and need a couple of extra on/off outputs.

OuX = 1, the outputs will modulate from 0V to 10V over the 0-100% range of any particular stage of heating or cooling. OuX = 2, same as the ‘1’ setting but the output modulates over the 0-5V scale

OuX = 3, same as the ‘1’ setting but the output modulates over the 2-10V full-scale OuX = 4, same as the ‘1’ setting but the output modulates in reverse i.e. 10V-0V

Note: For a 4-20ma actuator it is simple to convert the 2-10VDCsignal to a 4-20ma signal by tying in a 250 ohm resistor in series with the output and making sure the grounds of the actuator and tstat are common.

Setpoint Maximum (0-255, 50) for deg C, (0-255, 99) for deg F

Rev24: The maximum and minimum allow able user setpoint settings.The occupants cannot adjust the setpoint above or below these settings. The min and max setpoint values arein increments of 1° (i.e. 20 means 20°) and arein the same units (Cor F) as the tstat.

Note: the heating and cooling deadbands act in a way that reduces these settings by the amount of the deadband. For example, if the highest setpoint allowed is ‘SHI’ = 30°C and the heating deadband ‘Hdb’ = 2°C, heating w ill actually only be active up to 28°C. Similarly,if the ‘Cdb’ cooling deadband parameter is at 2°Cand the minimum setpoint is at 20°C, then cooling takes place only as low as 22°C.

MenuLock mode

Rev25 only: This setting is useful to keep the building occupants from experimenting in the menu system. When the LOC parameter is set to ‘1’ the keypad will be locked out from all menu operations. The normal operation of the keypad is not affected; the fan and setpoint buttons work as usual.When the LOC parameter is set to ‘2’the keypad will be locked out from partial menu operations allowing maintenance personnel to access some of the less critical menu parameters while maintaining a LOC on functions reserved for the primary administrator.This option allows access to the calibration of the internal and external temperature sensor(CALand CAE) and the override time parameter (ORT).LOC= 3,The user can not do anything from keypad except enter menu mode.In menu mode,the user can set setpoint,fan speed,calibration and override timer.When the menu system is locked out, the only way to adjust the tstat parameters is through the network port or through the communications jack at the bottom of the tstat. The parameter can be set back to ‘0’ only though the communications ports as well.

This setting allows the user to adjust the valve transient time from fully open to fully closed. Valuerangesfrom10 (10s) to 255 (255s)

Select

This allows the user to get the factory default setting back

determine the product

the microcontroller to determine the hardware rev”

16

vendor-id, vendor-name, system-status, confirmed-service, unconfirmed-service