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Thermidistat™ Control
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Installation, Start-Up, and Operating Instructions
NOTE: Read the entire instruction manual before starting the
installation.
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INDEX
Page
SAFETY CONSIDERATIONS .....................................................1
INTRODUCTION..........................................................................1
INSTALLATION CONSIDERATIONS .......................................1
INSTALLATION..................
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INSTALLATION TO SET: OFF—for normal operation. This is factory default. Step 1—Thermidistat Control Location ON—for installer test mode. Thermidistat Control should be mounted: Step 3—Install Thermidistat Control • Approximately 5 ft (1.5m) from floor. • Close to or in a frequently used room, preferably on an inside partitioning wall. Before installing Thermidistat Control, turn off all power to • On a section of wall without pipes or duct work. equipment. There may be more than 1 power disconne
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3. A2—for 2-speed air conditioner press SET TIME/TEMP button once. The large display will now flash, indicating that up and down buttons now control available 4. H2—for 2-speed heat pump choices within that option. Each press of TIME/TEMP button 5. dF—for 1-speed dual fuel switches between available option (small display) and available 6. d2—for 2-speed dual fuel selections within each option (large display). 7. HS—for 1-speed heat pump with Intelligent Heat Staging CONFIGURATION OPTIONS — SELEC
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3. Use up and down buttons to move between F and C on large call for cooling. Not all products with ICM blowers have this display. feature. Check Installation Instructions for ICM air handler used. Select OF for normal operation (Y and G supplied on a cooling 4. Press SET TIME/TEMP button again to flash upper small call). Select ON for super dehumidification (Y with no G on a display for selection of another option, or press END to exit dehumidify only call). Factory default is OF (off). configu
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Option 10—Dual Fuel Equipment to operate. This can be somewhat complicated to determine and it involves knowing the cost of gas and electricity, as well as the efficiency of the furnace and heat pump. For the most economical operation, the heat pump should operate above this temperature All dual fuel installations must be equipped with a high (assuming it has sufficient capacity), and the furnace should pressure switch to turn off compressor under a high indoor operate below this temperature. co
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will be supplied, resulting in additional outputs being turned on. If that it cannot switch between heat and cool without a 20 minute room overheats, specified outputs will not turn off, guaranteeing a "off" time between the 2 operations. Specifically, to switch from 1 sufficiently warm leaving air temperature during defrost. Tempera- mode to the other, there must be no demand for the old mode and ture overshoot during defrost can occur, but is almost never a demand for the new mode, and this mu
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A99059 Fig. 2—Programmable/Non-Programmable Keypad Labels 3. Use up and down buttons to move between OF and ON on 1. Enter configuration mode if not already there. See Step 4 "To large display. Factory default is OF. Enter Configuration Mode." Use up and down buttons to make small (now flashing) display indicate 17. 4. Press SET TIME/TEMP button again to flash upper small 2. Press SET TIME/TEMP button once to flash large display. display for selection of another option, or press END to exit conf
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Table 2—Equipment Outputs 1-SPEED AC 2-SPEED AC 1-SPEED HP 2-SPEED HP Cool—0 to 2 minutes Y, G Y1, G Y, G, O Y1, G, O Cool—2 to 4 minutes Y, G Y1, Y2, G Y, G, O Y1, Y2, G, O Heat—0 to 2 minutes W1 W1 Y, G Y1, G Heat—2 to 4 minutes W1, W2 W1, W2 Y, G Y1, Y2, G Eheat—0 to 2 minutes --- --- W1 W1 Eheat—2 to 4 minutes --- --- W1, W2† W1* * Two-stage heat not available NOTE: For Y—use terminal Y/Y2, for Y1—use terminal Y1/W2, for W2—use terminal O/W2, for O—use terminal O/W2, for W1—use terminal W/W1
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Table 4—Humidification Selections HUMIDIFY SET POINT SELECTION MODE DISPLAY FAN DISPLAY DISPLAY Normal Humidify Blank Blank Humidify Set Point Value Fan Humidify Blank FAN Humidify Set Point Value Auto Humidify AUTO Blank Humidify Set Point Value Auto and Fan AUTO FAN Humidify Set Point Value Humidify Off Blank Blank OF 4. Auto and Fan Humidify The cool to dehumidify selection tells the system to operate the compressor, within limits, when there is a dehumidify The 2 choices of AUTO and FAN can
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Table 5—Dehumidification Selections DEHUMIDIFY SET POINT SELECTION MODE DISPLAY FAN DISPLAY DISPLAY Normal Dehumidify Blank Blank Dehumidify Set Point Value Cool to Dehumidify COOL Blank Dehumidify Set Point Value Dehumidify OFF Blank Blank OF humidity removal is desired, this should be done, if possible. Fan Carrier 58MVP Furnaces also have a DEHUM input. The DE- coils have the capability of removing this off delay, furnaces do HUM input acts differently depending on which style of variable- no
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Thermidistat Control Troubleshooting SYMPTOM WHAT TO CHECK Open Thermidistat Control. Check for 24vac between R and C at screw terminals on mounting base. Reassemble, making No display sure pins on board engage sockets in mounting base. If display does not appear, replace Thermidistat Control. "--" in place of room temperature Thermidistat Control cannot properly read room temperature. Replace Thermidistat Control. "E3" or "--" in place of outdoor temperature Thermidistat Control cannot properly
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THERMIDISTAT CONTROL CONFIGURATION RECORD Date Owner/Operator Thermidistat Model No. " A) Hardware Configuration B) Mode Settings Switch A ____ AC/HP Select. (OFF = AC) ____ Hold (On or Off) Switch B ____ 1 or 2-Speed Compressor. (OFF = 1-Speed) ____ Mode (Off, Heat, Cool, Auto, Eheat) Switch C ____ Smart Recovery. (OFF = Enable) ____ Heating Set Point Value Switch D ____ Installer Test. (OFF = Disable) ____ Cooling Set Point Value ____ Fan (Auto or On) C) Configuration Options 1
