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Carrier Access Thermidistat - page 1
Thermidistat™ Control Installation, Start-Up, and Operating Instructions NOTE: Read the entire instruction manual before starting the installation. This symbol → indicates a change since the last issue. INDEX Page SAFETY CONSIDERATIONS .....................................................1 INTRODUCTION .......................................... ...
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Carrier Access Thermidistat - page 2
INSTALLATION Step 1—Thermidistat Control Location Thermidistat Control should be mounted: • Approximately 5 ft (1.5m) from floor. • Close to or in a frequently used room, preferably on an inside partitioning wall. • On a section of wall without pipes or duct work. Thermidistat Control should NOT be mounted: • Close to a window, on an outs ...
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Carrier Access Thermidistat - page 3
3. A2—for 2-speed air conditioner 4. H2—for 2-speed heat pump 5. dF—for 1-speed dual fuel 6. d2—for 2-speed dual fuel 7. HS—for 1-speed heat pump with Intelligent Heat Staging (3-stage auxiliary heat with 40FK, FK4C, or FV4A Series fan coils.) When this identifier disappears, normal operation begins. The MODE control should be set to OFF ...
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Carrier Access Thermidistat - page 4
3. Use up and down buttons to move between F and C on large display. 4. Press SET TIME/TEMP button again to flash upper small display for selection of another option, or press END to exit configuration mode. Option 4—Fan (G) On With W This selection determines whether fan (G) output is to be ON or OFF when any W (furnace or strip heat) output is ...
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Carrier Access Thermidistat - page 5
Option 10—Dual Fuel Equipment All dual fuel installations must be equipped with a high pressure switch to turn off compressor under a high indoor coil pressure condition. The high pressure switch protects compressor and indoor coil from overpressure which would occur if a failure or wiring error resulted in the heat pump and furnace operating at ...
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Carrier Access Thermidistat - page 6
will be supplied, resulting in additional outputs being turned on. If room overheats, specified outputs will not turn off, guaranteeing a sufficiently warm leaving air temperature during defrost. Tempera- ture overshoot during defrost can occur, but is almost never noticeable because of the short duration of the defrost cycle (4 minutes typical, 10 ...
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Carrier Access Thermidistat - page 7
3. Use up and down buttons to move between OF and ON on large display. Factory default is OF. 4. Press SET TIME/TEMP button again to flash upper small display for selection of another option, or press END to exit configuration mode. Option 17—Enable Non-Programmable Operation This option converts the programmable Thermidistat Control to a non-pro ...
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Carrier Access Thermidistat - page 8
TO TEST COOLING AND DEHUMIDIFICATION: Press MODE button until COOL icon turns on. Cooling begins within 10 sec and remains on for 4 minutes. If system is 2-speed, low speed comes on for first 2 minutes, followed by high speed for second 2 minutes. At the end of 4-minute run, cooling stops, and MODE reverts back to OFF. At any time during 4-minute r ...
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Carrier Access Thermidistat - page 9
4. Auto and Fan Humidify The 2 choices of AUTO and FAN can be selected together. This provides both functions simultaneously. 5. Humidify Off The humidify function can be turned off completely. This does not require changing existing set points. To Select Humidification (Between NORMAL, FAN, AUTO, FAN and AUTO, or OFF) (See Table 4.) Press HUMIDITY ...
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Carrier Access Thermidistat - page 10
humidity removal is desired, this should be done, if possible. Fan coils have the capability of removing this off delay, furnaces do not. On FK or FV Fan Coils, set delay tap to 0/0. On standard fan coils, a jumper can be cut to disable off delay. Refer to fan coil Installation Instructions for details. If FAN is set for continuous operation (fan O ...
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Carrier Access Thermidistat - page 11
Vacation Dehumidification Normal Dehumidify, Cool to Dehumidify, and Dehumidify OFF, are all available in vacation mode, and selection of 1 of these can be different from that of occupied. Vacation dehumidification selection and set points are remembered the next time vacation is used. Cool to dehumidify operates slightly differently, allowing the ...
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Carrier Access Thermidistat - page 12
THERMIDIST A T CONTROL CONFIGURA TION RECORD Date Owner/Operator A) Hardware Configuration Switch A ____ AC/HP Select. (OFF = AC) Switch B ____ 1 or 2-Speed Compressor . (OFF = 1-Speed) Switch C ____ Smar t Recov ery . (OFF = Enable) Switch D ____ Installer T est. (OFF = Disab le) Thermidistat Model No. B) Mode Settings ____ Hold (On or Off) ____ M ...
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