NOTE: Read the entire instruction manual before starting the installation.
Read and follow manufacturer instructions carefully. Follow all local electrical codes during installation. All wiring must conform to local and national electrical codes. Improper wiring or installation may damage a thermostat. Recognize safety information. This is the safety–alert symbol. When you see this symbol on the equipment and in the instruction manual, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety–alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies a hazard that could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions that will result in enhanced installation, reliability, or operation.
Power
Note that all thermostats are dual powered where batteries can be installed or in the presence of R and C (24vac) are not required. Two AA batteries are furnished with the product.
Models
There are 2 different models. The 5th and 6th letters of the part number indicate the model. These 2 letters also appear on the package and on the circuit board. Be sure to have the proper thermostat for the intended application. Models are:
Thermostat Location
The thermostat should be mounted:
The thermostat should NOT be mounted:
Select Model
AC Model
(1–stage cool, 1–stage heat) is to be used for single-stage heating and/or cooling applications only.
HP Model
(1–stage cool, 2–stage heat) can be used with a single–speed heat pump (HP), or an air conditioner (AC) with a 2–stage furnace or fan coil. Software Option 5 selects HP/AC operation. This thermostat comes configured from the factory as a heat pump thermostat. Select AC in software Option 5 for AC operation.
Table 1 – Model Selection and Wiring Diagram Chart
| OUTDOOR UNIT | AIR CONDITIONER 1 Speed | HEAT PUMP 1 Speed | |
| 1 –– Stage Furnace | Model AC See Fig. | — | |
| 2 –– Stage Furnace | Model AC See Fig. | Model HP See Fig. | — |
| Typical Fan Coil | Model AC See Fig. | Model HP See Fig. | Model HP See Fig. |
| Variable— Speed Fan Coil (FK4D, FV4, 40FK) | Model AC See Fig. | Model HP See Fig. | Model HP See Fig. |
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death. Before installing, modifying, or servicing the system, the main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag the switch with a suitable warning label.
CAUTION
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in equipment damage or improper operation. Improper wiring or installation may damage the thermostat Check to make sure the wiring is correct before proceeding with installation or turning on the unit.
NOTE: If a common wire has not been connected, two AA batteries must be used to power the thermostat. Make sure the customer is informed about changing the batteries every 12 months if a common wire is not available. If a common wire is connected, then batteries are not needed for any reason. Batteries may be installed if desired but the thermostat will not draw power from them.
Configuration options are intended to be selected at installation and are normally not modified by the homeowner. These options are not discussed in the Homeowner’s Guide and therefore must be made as part of the installation. A special procedure allows entry into the configuration mode. The thermostat will automatically exit this mode if no button is pressed for 3 minutes. While in the configuration mode, up to 14 option choices can be made:
An explanation for each of these and how to enter the configuration mode follows.
To enter the configuration mode
To enter Configuration Mode, hold the FAN button down for approximately 15 seconds. After the 15-second period, Option “01” will appear in the display and the SERVICE icon will be turned on.
NOTE: If the FAN button is pressed again or if no button is pressed for 3 minutes, the thermostat will exit the configuration mode and return to normal operation. To reenter the configuration mode, the FAN button must be pressed and held for 15 seconds again.
While in configuration mode
The display is used to show both the option number and the selection choice within that option.
OPTION 01 — ANTICIPATOR ADJUSTMENT
This adjustment controls the sensitivity and cycle rate of the thermostat. Higher numbers decrease the sensitivity and slow the cycle rate. Lower numbers increase sensitivity and increase the cycle rate. However, a limiting feature will not allow more than 6 equipment cycles per hour, regardless of setting. Values can range from 1 to 9. Factory default setting is 3. This default selection will provide optimum performance in nearly all installations. Try it first. Do not change setting unless there is evidence of need to do so. Unlike conventional anticipators, this setting is not to be determined by current draw. There is no need to measure, know, or compensate for current. There is also no droop with this thermostat, regardless of the anticipator setting. This adjustment controls only sensitivity and cycle rate up to maximum of 6 cycles per hour.
To Adjust:
OPTION 02 — CLEAN FILTER TIMER
This option selects the number of hours of blower operation (heating, cooling, or fan) before SERVICE FILTER icon is displayed. With OF selected, the icon will never come on, disabling this feature. Time selection can be from 400 to 3600 hours by selecting numbers 1 through 9. (Time is 400 X number selected.) Factory default is 2 (800 hours). Recommended selections are: disposable filter 800 hr, media filter 1200 to 1600 hr, or electronic air cleaner 1600 to 2400 hr of blower operation.
To Adjust:
OPTION 03 — FAHRENHEIT/CELSIUS SELECTION
This option selects Fahrenheit or Celsius operation.
To Select:
OPTION 04 — G (FAN) ON WITH W OUTPUT
This selection determines whether the G (fan) output is to be ON or OFF when any W (furnace or strip heat) output is ON. Most furnaces and fan coils manage their own blowers and do not require a separate G signal. For these applications, select OFF. Some auxiliary heaters require a separate G signal to turn on the blower. In this case, select On. Factory default is OF (off).
To Select:
OPTION 05 — HP / AC CONFIGURATION
This configuration is available on HP models only. Selecting AC allows the installer to use a HP thermostat in an air conditioner application.
To Select:
OPTION 07 — ZONING ON/OFF CONFIGURATION
This selection enables or defeats cycle timer, the staging timer, and the compressor timeguard. (See Operational Information for details.) These timers MUST be enabled (zoning OFF) for normal operation and disabled (zoning ON) for zoning applications. In zoning applications, the zone control center performs these timing functions. Factory default is OF.
To Select:
OPTION 10 — O (REVERSING VALVE) ON WITH HEAT OR COOL SELECTION
This selection is only available on HP model thermostats when HP is selected via Option 05. This selection determines whether the reversing valve is energized in the heating or cooling mode. Factory default is C, energized in cooling. Use up and down buttons to change between H and C.
To Select:
OPTION 13 — ROOM TEMPERATURE OFFSET
This option allows calibration (or deliberate miscalibration) of room temperature sensor. There are various reasons why the home owner may want to have displayed temperature adjusted to a higher or lower value. The selected number is the number of degrees, plus or minus, which will be added to the actual temperature. The number can range between –5 and +5. Factory default is 0. This adjusted value will be used as actual temperature for both display and control action. For example, if 2 is selected, 72_F/22_C actual will read 74_F/23_C. If setpoint is 72_F/22_C, the room will control to an actual value of 70_F/21_C which will be displayed and acted upon as if it were 72_F/22_C. The effect is that a positive number selection will make the room temperature lower and vice versa.
To Select:
OPTION 15 — AUTO MODE ON/OFF SELECTION
This options allows the installer to enable or disable AUTO mode (automatic changeover between heat and cool). When disabled, AUTO icon does not appear when successive presses of MODE button are used to move between OFF, HEAT, and EHEAT (in heat pump systems). Factory default is ON (AUTO mode enabled).
To Select:
OPTION 18 — BACKLIGHT CONFIGURATION
This function is only available when the thermostat is operating from full power via R and C. It is not available when the thermostat operates from batteries. In OF (off) mode, this function is disabled. The thermostat backlight will normally be off. It turns on with any button press and stays on for 10 seconds in between button presses. In ON mode, this function is enabled. The thermostat backlight will normally be on and dim in appearance. The backlight becomes brighter with any button press and remains bright for 10 seconds. Factory default is OF.
To Select:
OPTION 19 — EQUIPMENT PRESENT
This selection informs the thermostat of the heat, cool, and fan capabilities of the installed equipment. Select number 2, 3, or 4. Default is 4.
For equipment with heat and cool capability and fan selection, choose 4.
For equipment with only heat or cool, but with fan selection, choose 3.
For equipment with only heat or cool and no fan selection, choose 2.
To Select:
OPTION 21 — KEYPAD LOCKOUT
In OF (off) mode, the keypad is not locked out and has full functionality. In ON mode, the keypad is locked out and the lock icon on the display is illuminated. To unlock the keypad, the user must press and hold the up and down buttons simultaneously for approximately 5 seconds. The lock icon is turned off and the keypad will remain unlocked as long as the user presses a button at least every 30 seconds or for the entire duration of the installer test mode. If keypad remains idle for 30 seconds and the installer test mode is not in operation, the keypad will return to the locked state and the lock icon will illuminate on the screen.
To Select
The installer test will be initiated by pressing the fan button for 20 seconds (15 seconds will enter installer setup) “InS” will appear on the screen and the SERVICE icon will be illuminated.
In installer test mode, pressing the MODE button will change the system operating mode. Note that AUTO mode is not available in installer test. Heating and cooling modes must be tested
independently.
Terminating Installer Test
After 15 minutes of inactivity (no button presses by the installer), the thermostat will automatically revert to normal operation. Pressing RESET FILTER any time during installer test will terminate installer test and return the thermostat to normal operation
Step 5 — Check Thermostat Operation
Fan Operation
Checklist
| THERMOSTAT OUTPUT | |||||||||
| TSTAT Model | Outdoor Unit | Option 5 | 24V Hot | Common | Fan | Heat Stage 1 | Heat Stage 2 | Cool Stage 1 | Reversing Valve |
| T2SNAC01 | AC | N/A | R | C | G | W | N/A | Y | N/A |
| T2SNHP01 | HP | OFF | R | C | G | Y | W | Y | O/B |
| T2SNHP01 | AC | ON | R | C | G | W | O/B | Y | N/A |
A common connection not required if batteries are used. Fig. 2 — A/C Thermostat with Furnace
Common connection not required if batteries are used. Fig. 3 — A/C Thermostat with 2–Stage or Variable Speed Furnace
Five–minute
Compressor Timeguard The cycle timer limits the number of times the heating or cooling equipment can be energized in one hour. If option 1 is set to a value of 1 or 2, the equipment will be allowed to energize up to six times per hour. If option 1 s set to 3 or greater, then the equipment will be allowed to energize up to four times per hour. This timer is defeated for 1 cycle when the desired temperature is manually changed. It can also be defeated for 1 cycle by simultaneously pressing the FAN button and the INCREASE TEMPERATURE button.
Cycle Timer
This timer prevents the start of a heating or cooling cycle until at least 15 minutes after the last start of the same cycle. Its function is to assure that equipment is not cycled more than 4 times per hr. This timer is defeated for 1 cycle when the desired temperature is manually changed. It can also be defeated for 1 cycle by simultaneously pressing the FAN mode button and the INCREASE TEMPERATURE button.
Staging Timer
In multistage heating or cooling, this timer prevents any higher stage from turning on until the preceding stage has been on for 15 minutes. This timer is defeated if the temperature error is greater than 5_F/3_C (usually due to a large change in desired temperature).
Three–minute Minimum On Time
In normal operation, when a stage turns on, it will not turn off for a minimum of 3 minutes.
Heat/Cool Setpoints (Desired Temperatures)
A minimum difference of 2_ is enforced between heating and cooling setpoints. This is done by allowing one setting to “push” the other, to maintain this difference.
Auto Changeover
When the auto changeover mode is selected, a change from heat to cool (or vice versa) will not occur until an opposite mode demand has existed for 20 minutes. If the setpoint is changed, the 20 minute requirement is deleted. Auto mode may be disabled.
Emergency Heat Mode
When thermostat is configured as a heat pump and emergency heat mode is selected, all Y signals are locked out and W becomes energized upon a call for heat.
Heat On and Cool On Icons
When a heating or cooling demand exists, the HEAT ON or COOL ON icon will either remain on or flash. If flashing, the equipment is temporarily prevented from turning on by one of the timers (see above). While the icon remains on without flashing, the equipment is on.
Power On Check
When AC power is first applied, all segments of the display are turned on for a few seconds. Following this, the temperature display indicates the model/configuration via the following 2 digit code: AC—1–speed air conditioner, HP—1–speed heat pump.
Error Codes
—- — If the thermostat cannot properly read room temperature, the display will indicate —- (2 dashes) and all outputs (except the fan if on) will turn off. This is to prevent operation of the equipment if the thermostat has failed. E2 — If the AC line voltage drops below a minimum (brownout) level, all outputs are turned off and the display indicates E2. This condition will remain for 15 sec after proper line voltage is restored. If the AC line voltage disappears completely, the display will immediately go blank.
| SYMPTOM | WHAT TO CHECK |
| Blank LCD | Check for 24vac between R and C at terminal connections or battery. |
| “—- ” (2 dashes) on temperature display | Temperature sensor reading out of range. Check sensor for damage. If recycling power does not clear display, thermostat should be replaced. |
| “E2” on temperature display | Brownout condition or too low of voltage to thermostat. Double check wiring and check for 24vac between R and C. E2 will clear 15 sec after proper voltage is restored. |
| “SERVICE FILTER” on temperature display | After the selected number of hour of blower operation “FILTER” will display on LCD. This is to remind the homeowner to “check” the filter. Press RESET FILTER button to clear display and reset timer to 0. |
| Cooling will not come on | Select COOL mode. Set desired temperature to 10˚F below room temper- ature. Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for COOL ON icon and 24vac at Y (first–– stage) terminal. If present, thermostat is OK and problem is with equipment or wiring. If not present, replace thermostat. |
|
Heating will not come on | Select HEAT mode. Set desired temperature to 10˚F/6˚C above room temperature. Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for HEAT ON and 24vac at Y (first–– stage) terminal (with heat pump) or W (with air conditioner) terminal. If present, thermostat is OK and problem is with equipment or wiring. If not present, replace thermostat. |
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
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