Optional Accessories - Honeywell CM900 Installation Manual

Removing the Cover
1
Setting-up the Thermostat
Please follow the illustrations detailed on page 1 in sequence to install the thermostat correctly, then refer to the steps below:
NOTE: For gas boiler applications, the factory system settings will not need to be changed (for other applications see section 'Using the
Thermostat for Specific Applications' below).
To set-up the thermostat:
1. Remove the battery cover and insert the batteries supplied with the unit (2 x AA LR6 Alkaline Batteries).
2. Move the slider switch to the DATE position.
3. Use the or buttons to set the correct day / month / year, pressing the green
4. Use the or buttons to set the correct time, pressing the green
5. Move the slider switch to the required operating mode (AUTO, MAN or OFF) to begin operating at the default factory settings, or move to
PROG and modify the built-in heating program accordingly (see User Guide).
You can now use the 'User Guide' supplied with the thermostat to demonstrate how it works to the home owner.
Using the Thermostat for Specific Applications
The CM900 thermostat is a versatile controller that can be used to control many different applications. For most typical applications, like 'wall-hung
gas fired combination boiler control' or 'zone valve control', no adjustments from the factory settings are required.
For other applications, like controlling an oil burner, the best system performance can be achieved by modifying selected parameters of the
thermostat in installer's mode. The table below lists the most common settings used for a specific application:
Specific Application: Setting:
Cycle/Hour
HEATING
Gas Boiler (<30kW) 6
Oil Boiler 3
Thermal Actuator 12
Zone Valve 6
Electric Heating 12
(resistive load <8A)
AIR-CONDITIONING
Heat Pump / Air- 3
Conditioner
Fan Coil 6
2
button to confirm.
button to confirm.
What to change:
Minimum Note: All parameters listed below belong to category 2
ON Time - System Parameters (see Installer Parameters Table)
1 No changes required
4 Set 1:Ot parameter to 4
Set 2:Cr parameter to 3
1 Set 2:Cr parameter to 12
1 No changes required
1 Set 2:Cr parameter to 12
Set 3:EH parameter to 1
To enable switching between cooling and heating modes
adjust parameter 4:HC in category 2 (0 = disabled, 1 =
enabled). Now you can switch between these modes by
pressing the and buttons together for 5 seconds in
any of the product operating modes (AUTO, MAN or OFF).
Explain to the end user how to switch between these modes
using the and buttons and ensure the cooling program
is modified as required.
4 Set 1:Ot parameter to 4
Set 2:Cr parameter to 3
1 No changes required
CM900 - Programmable Room Thermostat
Using the Special Features of the Thermostat
Special Feature: Description:
Optimisation (Variable The thermostat will adjust the start time in the morning/afternoon so the
Start Time) desired temperature is reached by the start of the program period. The
system will restrict the start time to a max of 2 hours.
Heating or Cooling This product can be used for heating or cooling applications. If you select
Operation cooling mode the control algorithm and factory default program will be
modified. You can independently modify the heating and cooling profile.
Summer/Winter Auto This feature moves time automatically on the last Sunday of March and the
time change last Sunday of October. The feature is factory enabled.
Temperature Offset If the thermostat is located in a particularly hot/cold location and cannot
be moved because of wiring restrictions then the measured/displayed
temperature can be adjusted by +/- 3°C. This is useful if the homeowner
wants the reading to match another appliance temperature display.
Upper/Lower The normal upper temperature limit of 35°C can be reduced to 21°C to save
Temperature Limit the homeowner energy. The normal lower limit of 5°C can be increased up
to 21°C to protect inhabitants from cold.

Optional Accessories

Accessory: Description:
Outside Temperature An Outside Temperature Sensor can be fitted to the thermostat, allowing the
Sensor homeowner to display the outside temperature on the display by pressing
the button.
Remote Temperature A Remote Temperature Sensor can be fitted to the thermostat, allowing it
Sensor to control the temperature from another room e.g. in commercial premises
where the public may adjust keys.
Installation Guide
To Enable/Disable This Feature:
To enable: Set parameter 8:OP
(category 1) to 1.
To enable: Set parameter 4:HC
(category 2) to 1.
To enable: Set parameter 3:tC
(category 1) to 1.
Set parameter 12:tO (category 1) to
the required offset value.
Set parameter 6:uL (category 1) to the
desired upper limit.
Set parameter 7:LL (category 1) to the
desired lower limit.
To Enable/Disable This Feature:
1. Fit the sensor (instructions are
included in the sensor package).
2. Set 10:SS parameter (category 1)
to 1.
1. Fit the sensor (instructions included
in the sensor package)
2. Set 10:SS parameter (category 1)
to 2.
3