Carrier Access Thermidistat ÐEquipment Outputs, ÐEnergy Star Default Schedule, ÐFinal Settings

Table 2ÐEquipment Outputs

	1-SPEED AC	2-SPEED AC	1-SPEED HP	2-SPEED HP
CoolÐ0 to 2 minutes	Y, G	Y1, G	Y, G, O	Y1, G, O
CoolÐ2 to 4 minutes	Y, G	Y1, Y2, G	Y, G, O	Y1, Y2, G, O
HeatÐ0 to 2 minutes	W1	W1	Y, G	Y1, G
HeatÐ2 to 4 minutes	W1, W2	W1, W2	Y, G	Y1, Y2, G
EheatÐ0 to 2 minutes	---	---	W1	W1
EheatÐ2 to 4 minutes	---	---	W1, W2²	W1*

* Two-stage heat not available

NOTE: For YÐuse terminal Y/Y2, for Y1Ðuse terminal Y1/W2, for W2Ðuse terminal O/W2, for OÐuse terminal O/W2, for W1Ðuse terminal W/W1, for W2², use terminal Y1/W2

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 run time, cooling may be turned off by pressing MODE button until OFF appears. While cooling is on, successive presses of HUMIDITY button turn dehumidify output on and off. While this output is active, "dh" appears in cool set point display. Equipment outputs for different equipment types are listed in Table 2.

TO TEST PRIMARY HEATING AND HUMIDIFICATION:

Press MODE button until HEAT icon turns on. Primary heating begins within 10 sec and remains on for 4 minutes. This will be furnace or electric heat in AC system and heat pump heating in heat pump system. If system has 2 stages of primary heat, first stage will be on for 2 minutes followed by second stage for 2 minutes. At the end of 4-minute run, heating stops, and MODE reverts back to OFF. At any time during 4-minute run time, heating may be turned off by pressing MODE button until OFF appears. While heating is on, successive presses of HUMIDITY button turn humidify output on and off. While this output is active, "hu" appears in heat set point display. Equipment outputs for different equipment types are listed in Table 2.

TO TEST AUXILIARY HEATING:

Auxiliary heating only exists in heat pump systems. To test, press MODE button until EHEAT icon turns on. This will be electric heat in standard heat pump systems and furnace in dual fuel systems. Auxiliary heating begins within 10 sec and remains on for 4 minutes. If there are 2 stages of auxiliary heat, first stage comes on for 2 minutes followed by second stage for 2 minutes. At the end of 4-minute run, heating stops and MODE reverts back to OFF. At any time during 4-minute run time, heating may be turned off by pressing MODE button until OFF appears. Actual outputs for different equipment types are listed in Table 2.

Step 6ÐFinal Settings

Be sure to return DIP switch No. 4 back to OFF position to exit installer setup mode. Assuming system is to be left in operation after installation is complete, use MODE button to select between HEAT, COOL, or AUTO to provide desired operation of heating, cooling, or both.

The default set points and programmed schedule conform to the Energy Star® requirements of the U.S. Department of Energy for both heating and cooling. These provide energy saving tempera- ture settings. Refer to Table 3.

If programmed schedule is to be used, make sure HOLD icon is off. This feature is turned on and off by HOLD button.

If fixed temperatures are desired, use HOLD button to turn on HOLD icon. This will maintain set points, not allowing them to change with programmed schedule.

Table 3ÐEnergy Star Default Schedule

SCHEDULE	HEAT	COOL
Wake 6:00 AM	68°F	78°F
Day 8:00 AM	60°F	85°F
Evening 5:00 PM	68°F	78°F
Sleep 10:00 PM	60°F	82°F

The FAN button may be used to select between AUTO (fan on only with equipment) and FAN (fan on continuously) fan modes.

For further information on temperature selection and program- ming, refer to Homeowner's Guide.

HUMIDITY CONTROL FEATURES

The various humidity control features of the Thermidistat Control are explained below. They are grouped into 2 sections: humidifi- cation and dehumidification. At the end of each section, instruc- tions on how to select each feature are given.

HUMIDIFICATION

The Thermidistat Control directly connects to a standard 24-vac humidifier to control humidification in the home. A humidify set point between 10 and 45 percent relative humidity is selected by the homeowner, or all humidification can be turned off. When humidity in home drops below set point, humidifier will be turned on to raise humidity level. Humidification can only occur in heating mode (HEAT or AUTO/HEAT). Five different humidifi- cation selections are available and are described below.

1.Normal Humidify

In normal humidify, humidifier will be on if there is a humidity demand and any heating equipment is on. This will include furnace, heat pump, or auxiliary heat. In heat pump applications, this is an improvement over using an external humidistat, which only supplies humidity when auxiliary heat is on.

2.Fan Humidify

This configuration allows a humidify demand to turn on fan and humidifier together, even if there is no heat demand. It is particularly useful when the furnace is oversized, resulting in short heating cycles. It allows the humidifier to run longer, supplying more humidity to the home. Note that fan hours will increase, using more electricity. Also, the humidifier delivers less moisture to cooler air than it does to heated air.

3.Auto Humidify

This feature is designed to eliminate the problem of sweating windows in very cold weather. When selected, the set point is automatically reduced by 1 percent for every drop of 2°F in outdoor temperature between 50°F and 0°F. The set point may be changed at any time, and it will continue to track outdoor temperature from the new set point and current outdoor temperature. The adjusted set point range is still limited to between 10 and 45 percent relative humidity. To use this feature, an outdoor temperature sensor MUST be attached. If not, E3 error message will be displayed.

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