HEAT − Using the Heat 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 (indicated 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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| 82 | Copy Day/Time |
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70 | 66 | Fan | Hold | (DOOR |
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| OPEN) |
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Figure 4
COOL − Using the Cool Mode
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 8).
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| Turn Cool ON/OFF |
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| Heat | Cool |
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| Prog | Auto |
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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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Figure 7
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.
If the thermostat is in cool mode, pressing the COOL but- ton disables cool mode (indicated by OFF in the SYSTEM box − see figure 5).
Heat/Cool Mode |
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ROOM |
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| HEAT SETPOINT |
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Figure 5 |
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Heating Demand |
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| Cooling operation is indicated by flashing nowflake" | ||||||||
Set the thermostat to heat mode to control the heating | icons on the right side of the display. When the actual tem- | |||||||||||||||
equipment. Then, if the room temperature is lower than the | perature drops below the temperature setpoint, the snow- | |||||||||||||||
temperature setpoint, as shown in figure 6, the thermostat | flake icons will disappear. This indicates that the cooling | |||||||||||||||
detects a heating demand and will activate the heating | demand has been satisfied and that the cooling equipment | |||||||||||||||
equipment to satisfy the demand. |
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Heating Demand |
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ROOM |
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| 75 |
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72 | ° |
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| HEAT SETPOINT |
| demand is present, "Lo" will be displayed in the SYSTEM | ||||||||||||
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Figure 6 |
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Heating operation is indicated by a flame icon in the lower |
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right corner. When the actual temperature rises above the |
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temperature setpoint, the flame icon will disappear. This |
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| AUTO |
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indicates that the heating demand has been satisfied and |
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| COOL |
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that the heating equipment has been turned off. |
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If your system supports 2−stage heating (as does the |
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| HEAT SETPOINT |
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51M39 thermostat), you may notice various heating levels |
| Lo |
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being delivered during a demand. |
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NOTE − Heating equipment is activated for at least 3 min- |
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| Figure 8 |
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utes if no buttons are pressed during the demand interval. |
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Page 3
51M39 SERIES 5/2
