Frigor Tstat Series, Manual

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Tstat Series
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Code Description (Range, Default)
Add Modbus Device Address (1-254, 254)
This is the modbus address of the tstat. It is the address to which the stat will respond when receiving serial communication.
CAL Calibration of the Selected Temperature Sensor (0-1000, 500)
To calibrate the temperature shown on the tstat 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 shown matches the handheld
meter. When you are done, just let the display time out to normal operation, the display will stop
fl 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
will store the calibration
fi gures even through extended power 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 powered 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 500 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 (C or F) as the tstat.
Some calibration tips:
• The main error in calibration comes from not waiting long 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 the weak link in calibrating is usu-
ally the procedure used rather than the tstat accuracy.
• Make sure the tstat is mounted in a location free of drafts.
tSS Temperature Sensor Select (0-3, 0)
The tstat has an extra input for use with an external temp sensor.
tSS = 0: The tstat will use the internal temperature sensor IC for the display and PID calculations
tSS = 1: The tstat will use an external thermistor which is shown on the display and used for PID calculations.
tSS = 2: The tstat will use an internal thermistor which is shown on the display and used for PID calculations.
tSS = 3: The tstat will use an average of internal thermistor and external thermistor which is shown on the display and used for PID
calculations.
FIL Temperature Sensor Filter (0-10, 5)
Filter used for the raw temperature being read by the sensor.
This con
fi gures the weighted average used when fi ltering the raw temperature. 0 corresponds to no fi lter. 10 corresponds to a high
level of fi ltering. Set this to a low value if you want the input to respond quickly, a high value will smooth the readings more but make
them respond more slowly.
BAUDRATE
19200, 9600
dSC Short Cycle Delay (0-20, 0)
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 re-enter the mode it came from. For example, if the tstat is in Cooling1 mode, and then enters Coasting mode, it
will take a delay, dSC minutes, until it can re-enter into Cooling1 mode. This value is in increments of 1 min.
dCH Changover Delay (0-200, 0)
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 tstat can enter the opposite mode. This value is in
increments of 1 min.