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Hersteller: Bryant Dateigröße: 492.72 kb Dateiname: iit1-pac-08.pdf Unterrichtssprache:

Note that this option allows a HP thermostat to be converted to control an AC system. Option 03 - --Fahrenheit/Centigrade Selections: F = Fahrenheit — This is default. C = Centigrade. Selects temperature display units. Option 04 - --Fan (G) ON with W output Selections: OF = G not energized with W — This is default. ON = G energized with W. This selection determines whether the fan (G) is to be ON or OFF when the W (furnace or strip heat) is ON. Furnaces and fan coils which manage their own blowers do not require a separate G signal. Some auxiliary heaters require a separate G signal to operate the blower when W is applied. This option allows a HP thermostat to control an AC system. Option 10 - --Reversing valve Selections: C = reversing valve energized in cooling —This is default. H = reversing valve energized in heating — Only appears in HP systems. Option 13 - --Room Air Temperature Offset Selections: ±5_F/±3_C. Default is 0. The number of degrees to be added to the displayed temperature to calibrate or deliberately miscalibrate the measured room temperature. This option is in _Fevenif Option3is set for _C. Option 21 - --Keypad Lockout Selections: ON, OF — Default is OF. With OF selected, the keypad cannot be locked. With ON selected the keypad will be locked and can be unlocked by simultaneously pressing the UP and DOWN keys for 5 seconds. Once unlocked, it will relock 2 minutes after the last keypad press. If any key is pressed and the thermostat is locked, “loc” will be displayed in the clock digits. Option 26 - --Minimum Cooling Setpoint Selections: 50_ to 90_F/10_ to 32_C— Default is 52_F/11_C. Sets the lowest cooling setpoint available to the user. Option 27 - --Maximum Heating Setpoint Selections: 50_ to 90_F/10_ to 32_C— Default is 88_F/31_C. Sets the highest heating setpoint available to the user. Step 4 — Understand Thermostat Operation Temperature Display Thermostat will display room temperature until UP or DOWN button is pressed. The words SET TEMP appear when these buttons are pressed and the current setpoint is displayed. If no buttons are pressed for 5 sec, the display will change back to show room temperature. Backlighting Continuous backlighting is not available. The backlight will come on for 10 seconds after any button press. Without AC power and when the battery is low, the backlight will remain off with button presses. Battery Indicator A battery indication icon on the display shows nothing, half, or low/no battery condition. If the battery is full or operation is from AC power, no icon appears. Under battery operation, if the battery is half full, a half full battery icon appears. As the battery depletes below half, the icon remains at half, but the 10 second backlight disappears. When the battery is absent or depleted, the display goes blank except for an empty battery icon and all outputs are turned off. Timeguard Timer A 5- --minute timeguard is built into the thermostat immediately upon power up, and any time the compressor turns off. The compressor will not turn on until the timeguard has expired. The timeguard affects only compressor operation. Pressing UP and FAN buttons simultaneously will override the timeguard for 1 cycle. If PTAC operation (PH or PC) is selected under Option 1, the timeguard timer is eliminated. Cycle Timer In normal heating and cooling operation the thermostat will not allow more than 4 equipment cycles per hour (or 1 cycle every 15 minutes). Both the Y and W outputs have a 15- --minute timer that starts counting down when the output is turned on, (e.g., if Y output is turned on for 9 minutes and then satisfies, it cannot turn back on for another 6 minutes regardless of demand). However, T1PAC/ T1PHP 3 pressing UP and FAN buttons simultaneously or changing the setpoint will override the timer for 1 cycle. Minimum on Timer Once the equipment has turned on, it will remain on for a minimum of 3 minutes regardless of demand. However, the equipment can turn off in less than 3 minutes if a change in setpoint, or a change in mode occurs. Staging Timer If the thermostat is a heat pump model, it has 2- --stage heat capability. In normal operation there is a 15- --minute delay between the first and second stages of heat. The Y output will energize first, then 15 minutes later, W is allowed to come on if the thermostat determines it is not satisfying the demand. However, if the heating demand is greater than 5_F/3_C, there will be only a 30 second delay before bringing on W. Auxiliary Heat Indicator When operating a heat pump and either auxiliary heat or emergency heat is active, a front mounted LCD indicates this condition. A07821 Error Messages If the room temperature sensor fails, two dashes (- --- --) will appear in the temperature display and all heating and cooling outputs will be turned off. The thermostat must be replaced. If the internal non- --volatile memory fails, E4 will alternately flash with the temperature on the display and all heating and cooling o...

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