4.3 Using the Room Thermostat for Specific Applications
The CM927/921 RF room thermostat is a versatile controller that can be used to control many different applications. For most typical applications, like
Specific Application: | Setting: |
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| Cycle/ | Minimum ON | Note: All parameters listed below belong to category 2 | ||
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| Hour | Time | - System Parameters (see Installer Parameters Table) | ||
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HEATING | Gas Boiler (<30kW) | 6 | 1 | No changes required |
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| Oil Boiler | 3 | 4 | Set 1:Ot parameter to 4 |
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| Set 2:Cr parameter to 3 |
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| Thermal Actuator | 12 | 1 | Set 2:Cr parameter to 12 |
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| Zone Valve | 6 | 1 | No changes required |
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| Electric Heating | 12 | 1 | Set 2:Cr parameter to 12 |
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| Set 3:EH parameter to 1 |
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AIR- |
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| To enable switching between cooling and heating |
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CONDITIONING |
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| modes adjust parameter 4:HC in category 2 (0 = |
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| disabled, 1 = enabled). Now you can switch between | ||
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| these modes by pressing the | and buttons |
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| together for 5 seconds in any of the product operating | ||
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| modes (AUTO, MAN or OFF). Explain to the end user | ||
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| how to switch between these modes using the | and | |
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| buttons and ensure the cooling program is modified | ||
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| as required. |
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| Heat Pump / Air- | 3 | 4 | Set 1:Ot parameter to 4 |
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| Conditioner |
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| Set 2:Cr parameter to 3 |
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| Fan Coil | 6 | 1 | No changes required |
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4.4 Using the Special Features of the Room Thermostat
Special Feature: | Description: | Enable/Disable |
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Optimisation | The thermostat will adjust the start time in the morning/afternoon so the | To enable: Set parameter 8: |
(Variable Start | desired temperature is reached by the start of the program period. The | OP (category 1) to 1. |
Time) | system will restrict the start time to a max of 2 hours. |
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Heating or Cooling | This product can be used for heating or cooling applications. If you select | To enable: Set parameter 4: |
Operation | cooling mode the control algorithm and factory default program will be | HC (category 2) to 1. |
| modified. You can independently modify the heating and cooling profile. |
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Summer/Winter | This feature moves time automatically on the last Sunday of March and | To enable: Set parameter 3: |
Auto time change | the last Sunday of October. The feature is factory enabled. | tC (category 1) to 1. |
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Temperature Offset | If the thermostat is located in a particularly hot/cold location for reliable | Set parameter 12:tO |
| signal transmission reasons then the measured/displayed temperature | (category 1) to the required |
| can be adjusted by +/- 3°C. This is useful if the homeowner wants the | offset value. |
| reading to match another appliance temperature display. |
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Upper/Lower | The normal upper temperature limit of 35°C can be reduced to 21°C | Set parameter 6:uL (category |
Temperature Limit | to save the homeowner energy. The normal lower limit of 5°C can be | 1) to the desired upper limit. |
| increased up to 21°C to protect inhabitants from cold. | Set parameter 7:LL (category |
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| 1) to the desired lower limit. |
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CM900 Wireless - Programmable Room Thermostat |
