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CM900 Wireless
Installation Guide
CM927 / CM921 Wireless Programmable
Room Thermostat & BDR91 Relay Box
Description Table of Contents
The Honeywell CM900 Wireless (CM927 or Section Page
CM921) is a modern wireless programmable
1) Installation Information ................................. 2
room thermostat based on Honeywell’s proven
programming philosophy. To further improve the
2) Installing the CM900 Wireless System ......... 3
ease of use, this product includes an extra large
2.1 Insta
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1) Installation Information As these products communicate using RF technology special care must be taken during installation. The location of the RF components as well as the building structure may influence performance of the RF system. To assure system reliability, please review and apply the information given below. Within a typical residential building the two products should communicate reliably within a 30m range. It is important to take into consideration that walls and ceilings will r
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2) Installing the CM900 Wireless System Please follow the illustrations and information below in sequence to install the Relay Box and room thermostat correctly. For applications other than gas boilers, enabling special features and to see what other system options are available refer to section 4) Installer Mode. 2.1 Installing the Relay Box = M3.5 1 2 3 a. o = N 6 2 The Relay Box is a RF device. For the best performance install in an open space. Leave at least 30cm distance 1 from any met
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2.2 Installing the Room Thermostat 2.2.1 Power Up 1. Remove the battery cover and insert the batteries supplied with the room thermostat (2 x AA LR6 Alkaline Batteries). 2. On the initial power up the available user interface languages will be displayed (only on certain models). Use the or buttons to cycle through the options until the desired language is displayed. Press the green button to confirm the selection. 3. Set the slider switch to the DATE mode. 4. Use the or buttons to set
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1.2m 2.2.3 Locating the Room Thermostat While still in the Test Mode, as described in section 2.2.2, the room thermostat should be located taking the following into consideration and reviewing the illustrations below: 1. Find a suitable location where the signal transmission is reliable. Reliable transmission is indicated when the Relay Box is flashing the green LED every 6 seconds. NOTE: The Relay Box relay will be off. 2. Install the room thermostat EITHER on the wall using the wall bracket
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3) Basic Operation of the System 3.1 Automatic Operation BDR91 Relay Box The Relay Box receives the heat demand (0- 100%) signal from the room thermostat. The room thermostat will display the symbol on the LCD display whenever more heat is required. Push button and Depending on the demand the Relay Box will relay status LED’s switch the heating device on to match the current requirements of the system. The green LED indicates the status of the relay output: • Gr een LED on = r elay on •
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4.1 Entering Installer Mode 1 2 DA Y COPY DA Y DATE OFF PROG AUTO MAN OFF C M 9 2 7 1..6 The unit will display the first parameter of installer Move the slider switch to the OFF mode. parameter group category 1 (from Parameter n.1 Press and hold the button and the two & to n.19) as shown buttons together. 3 4 Press the or to Press the green change factory setting. button to confirm the change. The display will flash indicating that a change The display will stop has been made. fla
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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 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 room thermostat in the
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4.5 Installer Parameters Table 4.5.1 Category 1 - Room Thermostat Settings Parameter Parameter Factory Default Setting Optional Setting No. Category 1 Parameters – Room Thermostat Settings Display Description Display Description AM-PM / 24hr 1:CL 24 24 hr clock display 12 12 hr – AM/PM clock display format Display format Reset Time/ Temp 2:rP 1 Time / Temp profile set 0 Time / Temperature are as programmed Program to factory default Changes to 0 when To restore the factory profile set to 1 one
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4.5.2 Category 2 - System Settings Parameter Parameter Factory Default Setting Optional Setting No. Category 2 Parameters – System Settings (press the button to access this category) Display Description Display Description Minimum boiler 1:Ot 1 1 minute minimum 2 to 5 Selection of 2, 3, 4 or 5 minutes ON time ON time minimum ON time Cycle Rate 2:Cr 6 6 cycles per hour 3,9 or Selection of 3, 9 or 12 cph (cph) 12 Heat/Cool Change 4:HC 0 Disabled 1 Enabled Pump Exercise 5:PE 0 Pump exercise 1 Pum
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5) Additional Installation Information 5.1 Binding / Rebinding Procedure The binding operation described below is required if: • Any of the system components (r oom ther mostat or Relay Box) ar e r eplaced. • The Relay Box has incorr ect or no binding data stor ed (e.g. when pr e-bound system pack components have been mismatched). NOTE: During the binding procedure keep approximately 1m distance between the room thermostat and the Relay Box. To bind/rebind: 1. Press and hold t
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6) Trouble Shooting 6.1 Trouble Shooting Guide Symptom (Fault Possible Cause Remedy Message) The room thermostat This is normal operation. The Relay Box cycles Using the button change the the relay on and off for times proportional to displays the symbol but temperature setpoint by a few degrees. the demand signal (0-100%) from the room the Relay Box relay does The Relay Box should switch the relay on thermostat. The symbol only indicates that the not switch on. after a few seconds de
