Related Manuals for Systems Controls & Instruments CEM-24 Series
Summary of Contents for Systems Controls & Instruments CEM-24 Series
- Page 1 CEM-24 Series Owner's Manual - Installation and Operating Instructions Pipersville, PA 18947 USA Phone: (215) 766-1487 - Fax: (215) 766-1493 Rev. 6.4 – 01.10 Email: support@scillc.com - www.scillc.com...
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Page 2: Table Of Contents
Please read this manual carefully before installation and use. Index Options and Accessories Installation Instructions Wiring Connections Hardware Jumpers Configuration Operating Manual Programming Override set temperature Economy Mode (Set Back Mode) Alarm Conditions (red LED light) General purpose output - "OUT, OUT" Thermostat Reset Technician Settings Connection of External sensor... -
Page 3: Options And Accessories
Warning The CEM features advanced indication capabilities, and will notify you of your HVAC system condition. It is by no mean a replacement for your alarm systems of your house and business facilities. The company will not be responsible for any loss or damage that may result if the CEM fails to indicate any alarm condition. -
Page 4: Installation Instructions
2. Installation Instructions A. Separate the front panel from back panel by depressing the two tongues located in the bottom and in the left of the unit. B. Gently disconnect the quick connector on the back Spring Tongue panel. Spring C. -
Page 5: Wiring Connections
3. Wiring Connections 3.1 Phone line - wiring diagram. The CEM-24 thermostat has a telephone line connection, exactly like an answering machine or a modem, and is connected in the same way. The thermostat has 2 telephone line outputs (TEL,TEL), where polarity is irrelevant. Connection to low voltage wires a regular... - Page 6 3.2 Connections for all applications Notes: 1. Connection to 2-wire Millivolt system is used only in HC configuration! 2. Be advised that the turn on time for the LCD to light up is up to 10 seconds from the time 24VAC is applied. 3.
- Page 7 3.3 Connections of heat outputs The CEM-24 thermostat has can be connected to three types of heating systems: Connection to 24VAC Heat Pump system JP1 on base plate must be moved to “3” position and JP6 on the front plate must be short (HP). Connection to 24VAC Heat Element JP1 on base plate must be moved to “3”...
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Page 8: Hardware Jumpers Configuration
4. Hardware jumpers Configuration 4.1 The Jumpers are located as shown in the picture: Base plate Front plate Note: In some revisions, JP3 is located on top of JP4. - Page 9 Front plate – jumper configuration: Jumper No. Function Position Default Internal Sensor Control “B” Position External sensor control “A” Position 4 minutes delay for compressor Open No delay Short Clock mode – 24 hours Open Short Clock mode – 12 hours (AM/PM) “OUT,OUT”...
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Page 10: Operating Manual
5. Operating Manual 5.1 Turn the thermostat On or Off ON/STBY Press the On/Off button to activate the thermostat – • ALARM The Green LED will turn on. ON/OFF Press and hold the On/Off button (5 seconds) to turn • the thermostat off –... - Page 11 5.2 Real time clock and day • Press the Clock button – the hours will flash. • Adjust the hours using the “+” and “-” buttons (set buttons). • Press the Clock button again – the minutes will flash. • Adjust the minutes using the “+” and “-” buttons. •...
- Page 12 5.4 Set temperature Set temperature in Cool and Heat modes. • Press the “+” or “-” buttons - set temperature will flash. • Adjust the set temperature using the “+” or “-” buttons. • Wait until display returns to normal mode. Set temperature in auto change-over mode.
- Page 13 In auto change-over mode – a solid “|” or “||” signs will flash next to the mode to indicate the active stage (HEAT 1 or HEAT 2, COOL 1 or COOL 2). Solid non- flashing “|” will appear next to the mode to indicate that none of the stages is currently active and the displayed set-point temperature is of that mode.
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Page 14: Programming
6. Programming The thermostat is 5-1-1 weekly programmable, meaning; Weekdays - Monday through Friday / Saturday / Sunday have individual programs. There are four different program events per day. Program Display... - Page 15 6.1. Setting the Program Pressing the Prog button does all Programming selections • Press the Prog Button - the hour and minute will flash. This shows that you are entering the Prog mode. Alarm Limits Prog Clk Select Mode Auto Reset Period of program Program Number...
- Page 16 • Press the Prog button again - the minutes on display will flash. • Adjust the minute using the ‘+’ and ‘-‘ buttons. Alarm Limits Prog Clk Select Mode Auto Reset • Press the Prog button again - heat and temperature on display will flash. •...
- Page 17 • Press the Prog button again - cool and temperature will flash. • Adjust the set temperature for cooling using the ‘+’ and ‘-‘ buttons. The controller keeps a safe differential of at least 1 degree between Heat set and Cool set (Heat is always less than Cool). Alarm Limits Prog...
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Page 18: Override Set Temperature
6.2. Weekly Program Mode and Manual Mode. You can change between weekly program and Manual program, by pressing and holding (3 seconds) the Prog button in normal display. When the weekly program is activated, the clock symbol and the word “Program”, (in brackets) will be displayed. -
Page 19: Economy Mode
8. Economy Mode Economy mode overrides the set point temperature and uses set economy temperatures for heat and cool when you leave home or office for any period of time - vacation, unexpected event - and the system will work in economy mode. (To set temperature for economy mode See # 11.6) 8.1 Set the thermostat to work in Economy Mode. - Page 20 9. Alarm Conditions (Red LED) Red LED Thermostat Tel. voice Reset button Alarm type indication operation response operation “You have an temperatures alarm goes higher or The “AL,AL” Flashes condition. lower than the outputs will None slowly Temperature alarm limits set be activated in the room by the technician...
- Page 21 10. General Purpose Output – "OUT, OUT" Normally open, dry contact, general purpose output that can be activated manually or by phone command. The output can be connected to a boiler, or other consumer, and can be activated remotely using phone command when you are NOT in the house. The output can be controlled using 3 commands: Turn the output ON.
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Page 22: Thermostat Reset
11. Thermostat Reset The hidden button on the bottom left side of the thermostat can be used to: 11.1 Reset the thermostat to its default settings. Press and hold the “+” button. Simultaneously, press and release the hidden button. Release the “+” button. 11.2 Return the thermostat to its previous state. -
Page 23: Technician Settings
12. Technician settings These settings allow changes to the following: • Heat temperature limit and Cool temperature limit. • High temperature alarm and Low temperature alarm. • Economy mode temperature – for cooling and Economy mode temperature – for heating 12.1 Enter code for technician •... - Page 24 12.3 Set Cool temperature limit - CL: • Press the Alarm Limit button again - the LCD will show: ‘+’ and ‘-‘ buttons. • Adjust the low temperature limit using the (This will limit the Min. range of adjusting set temperature). Range 35°F-98°F (3°C-37°C).
- Page 25 12.5 Set Low temperature alarm - LA: • Press the Alarm Limit again for low temperature: • Adjust the temperature. Range 33° F-98° F (1 °C-37°C), default 35° F (5 °C) - The unit will not allow you to adjust low temperature alarm to be higher than high temperature alarm.
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Page 26: Connection Of External Sensor
13. Connection of External Sensor Important! The external sensor must be SCI type. N.TC. Sensor: Temperature ~ Resistance Characteristics 10.0 12.8 15.6 18.3 21.1 23.9 26.7 29.4 32.2 Temp ° ° ° ° C Temp ° ° ° ° F Res. - Page 27 Setting the Thermostat Response to Incoming Calls • Press the Select button again – "TAD0" appears on LCD. • Choose between "TAD 0" and "TAD 1" using the ‘+’ and ‘-‘ buttons. ‘TAD 0’ = The thermostat will answer an incoming call immediately. ‘TAD 1’...
- Page 28 E.g. Number rings for answering machine is 4. Number rings for the CEM-24 is 5. Follow these steps: 1. Set the ring setting to 6 rings (see below). 2. Call the CEM-24. 3. Let the telephone ring 3 times and hang up. 4.
- Page 29 15. Menu of commands from a telephone to the thermostat • Enter your password: 1•2•3•4•# (factory default - Turn air conditioner ON or any other code you have chosen 4 numbers only) 1 2 3 1 2 3 1 2 3 4 5 6 4 5 6 4 5 6...
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Page 31: Troubleshooting For Technician
16. Troubleshooting for Technician Problem Solution The unit is not getting 24Vac - Check the wiring The display does not light connections, R (Phase), C(common). The temperature sensor is sensing an OPEN CIRCUIT. Temperature in the room Replace the jumper JMP1. If the temperature returns (display) dropped to 0°F to normal - there is a problem with the external sensor.
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