small screwdriver to move the switch to the ON position (see figure at right). Leave the battery out of the thermostat for at least two minutes, to allow the thermostat to reset itself. DO NOT MOVE OPTION SWITCHES #1 OR #2, as this may affect thermostat operation. [Option switch #3 enables/dis- ables keypad lockout (see TOTAL KEY- PAD LOCKOUT)]. Replace the battery, re- program the thermostat, if necessary, put the thermostat back on the wall, and restore 24 VAC power. To set the thermostat for automatic changeover after programming,
press | SYSTEM | to set the thermostat to AUTO |
HEAT/EMER/OFF/ | ||
| COOL/AUTO |
|
(the setpoint temperature display is blank in the AUTO mode). The system will now automatically switch between heating and cooling, depending on the actual room tem- perature.
Automatic Changeover
ON
1 2 3 4
Switch #1 set at installation (DO NOT CHANGE) Switch #2 set at installation (DO NOT CHANGE) Switch #3 (see TOTAL KEYPAD LOCKOUT)
Switch #4 ON
In the AUTO mode, the thermostat will not allow the temperature separation between the highest heat setting and the lowest cool setting to be less than 1°F. For example, if the highest heat setting is 76°F, the lowest cool setting cannot be below 77°F (see diagram below).
79 | COOLING TEMPERATURES | ||
78 | |||
|
| ||
77 |
| DEAD BAND 1°F | |
76 |
| ||
75 | HEATING TEMPERATURES | ||
74 | |||
|
| ||
73 |
|
| |
13
