HEAT − Using the Heat Mode
COOL − Using the Cool Mode
Enabling and Disabling Heat Mode
The thermostat must be in the heat mode to control the heating equipment. Press the HEAT button to enable or disable heat mode. If the thermostat is in cool or off mode, pressing the HEAT button enables the heat mode (indi- cated by HEAT in the lower right corner − see figure 4).
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| Turn Heat ON/OFF |
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| Heat | Cool |
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| Prog | Auto |
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| 5:30 |
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| 82 | Copy Day/Time |
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70 | 66 | Fan | Hold | (DOOR |
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| OPEN) |
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| Settings Enter |
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| (Outside) |
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Figure 4
If the thermostat is in heat mode, heat mode is disabled when the HEAT button is pressed. This is indicated by OFF near the right side of the display as shown in figure 5.
Heat/Cool Mode Disabled
ROOM |
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| OFF | |
75° | 75° |
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| HEAT SETPOINT | |
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Figure 5
Heating Demand
Set the thermostat to heat mode to control the heating equipment. Then, if the room temperature is lower than the temperature setpoint, as shown in figure 6, the thermostat detects a heating demand and will activate the heating equipment to satisfy the demand.
Heating Demand
ROOM |
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72° | HEAT SETPOINT |
75° HEAT |
Figure 6
Heating operation is indicated by a flame icon in the lower right corner. When the actual temperature rises above the temperature setpoint, the flame icon will disappear. This indicates that the heating demand has been satisfied and that the heating equipment has been turned off.
NOTE − Heating equipment is activated for at least 3 min- utes if no buttons are pressed during the demand interval.
Enabling and Disabling Cool Mode
Use the COOL button to enable or disable cool mode as desired. If the thermostat is in heat or off mode, cool mode is enabled when the COOL button is pressed. This is indi- cated by COOL on the right side of the display (see figure 7).
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| Turn Cool ON/OFF |
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| Heat | Cool |
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| Prog | Auto |
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| i0:30 |
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| 70 | Copy Day/Time |
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75 | 66 | Fan | Hold | (DOOR |
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| OPEN) |
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| Settings Enter |
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| (Outside) |
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Figure 7
If the thermostat is in cool mode, pressing the COOL but- ton disables cool mode (indicated by OFF, similar to figure 5).
Cooling Demand
Set the thermostat to cool mode to control the cooling equipment. Then, if the room temperature is higher than the temperature setpoint, as shown in figure 7, the thermo- stat detects a cooling demand and will activate the cooling equipment to satisfy the demand.
Cooling operation is indicated by flashing nowflake" icons in the display. When the actual temperature drops below the temperature setpoint, the snowflake icons will disappear. This indicates that the cooling demand has been satisfied and that the cooling equipment has been turned off.
NOTE − If no buttons are pressed during a demand for cooling, the equipment must operate for at least 4 minutes. After a demand has been satisfied, cooling equipment op- eration is locked out for 5 minutes. If another cooling de- mand occurs during this 5−minute interval,
snowflakes will flash; however, the cooling equipment will not operate until the 5−minute delay has elapsed.
NOTE − The cooling setpoint cannot be lower than the heating setpoint. Also, the difference between the cooling and heating setpoint must be at least 4 degrees.
AUTO − Using the Autochangeover Mode
When in either heat mode or cool mode, autochangeover can be enabled or disabled by pressing the AUTO button. If enabled, AUTO appears at the lower right corner of the dis- play. The thermostat will then automatically change over from heating to cooling and vice versa, to keep the room temperature in between the heating and cooling setpoints. Autochangeover can be used in either of the thermostat hold modes, or when the thermostat program is running. These modes are described later.
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51M38 SERIES 5/2
