14. Turn ON power to unit.
On power up, depending on the thermostat model being used, the LCD readout will display either AC for air conditioner model (1-stage heat/1-stage cool) or HP for heat pump model (2-stage heat/1-stage cool).
Step 3 — Set Thermostat Configuration
Configuration options enable the installer to configure the thermostat for a particular installation.
These are not presented to the homeowner and therefore must be properly set by the installer. Following is a list of the options available, an explanation of their function, and their factory default settings. Not all numbers are used in the Base Series because not all options are available in this series.
Configuration Options - Summary:
Option 01 - Equipment type
Option 03 - Fahrenheit/Centigrade
Option 04 - Fan (G) on with W output
Option 10 - Reversing valve
Option 13 - Room air temperature offset
Option 21 - Keypad Lockout
Option 26 - Minimum Cooling Setpoint
Option 27 - Maximum Heating Setpoint
To Enter The Configuration Mode:
Press and hold the FAN key for about 10 seconds until the display changes so that only two pairs of digits are showing. The configuration number, now 01, will appear in the setpoint/temperature location and the configuration setting will appear in the clock location. The configuration number (left pair) will be flashing which means it can be adjusted using the UP and DOWN keys. To cause the opposite pair to flash (to be adjustable), press the H/C key. Successive presses of the H/C key alternate between the configuration number (left) and the configuration setting (right). To exit the configuration mode, press the HOLD/END key. If no key is pressed for 3 minutes, the configuration mode will automatically exit, returning the thermostat to normal operation.
Configuration Options - Selection:
Option 01 - Equipment type
Selections: with HP thermostat: HP, AC, PH, or PC with AC thermostat: AC or PC
Meanings:
PH or PC selects PTAC units (Packaged Terminal Air Conditioners) which are used in motel rooms and other rented spaces. When this option is selected, the display shows only the setpoint, not the room temperature. Also, the compressor timeguard is disabled, allowing the compressor to turn on immediately when a demand is established.
HP or PH controls 1 speed heat pump with 1 stage of aux heat. AC or PC controls 1 speed air conditioner with one stage of heat.
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 _F even if Option 3 is 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.
Back lighting
Continuous back-lighting 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
A5-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,
