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Programmable Electronic Thermostat
7-Day Programmable, Auto Changeover, Fan Speed Control, Hardwire
Part No.668811101
For replacement parts call 1-800-377-2787
©2008 McQuay International • www.mcquay.com • 800-432-1342
Installation,
Operation & Application Guide
• 7-Day Programmable
• Single Stage Heat Pump/Non-Heat Pump Systems
• Backlit Display
• Single Stage Heat/Cool Systems
• Two Speed Fan Control
• Field Calibration
• Auto Changeover
• Button Lockout Function
• SimpleSet™ Programming
• Remote Temperature Sensor Capability
• Title 24 Compliant / No Batteries Required
• Relay Outputs (minimum voltage drop in thermostat)
• Ideally Suited for:
– Residential (New Construction/Replacement)
– Light Commercial
LIAF015
Group: WSHP
Supercedes: N/A
Date: 03-23-09
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Table of Contents
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Summary of Contents for McQuay LIAF015
- Page 1 • Remote Temperature Sensor Capability • Title 24 Compliant / No Batteries Required • Relay Outputs (minimum voltage drop in thermostat) • Ideally Suited for: – Residential (New Construction/Replacement) – Light Commercial For replacement parts call 1-800-377-2787 ©2008 McQuay International • www.mcquay.com • 800-432-1342...
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Page 2: Table Of Contents
Table of Contents Specifications ............................1 Important Safety Information ......................... 1 Package Contents/Tools Required ......................1 To Remove Existing Thermostat ......................2 To Install Thermostat ..........................2 Remote Sensor Installation (Optional) ....................3 Wiring Diagram ............................4 Configuration Mode ..........................5 Starting the Thermostat ......................... -
Page 3: Specifications
• Do not use air conditioning when the outdoor temperature is below 50 degrees; this can damage your A/C system and cause personal injuries • Use this thermostat only as described in this manual Package Contents/Tools Required Package includes: McQuay 668811101 programmable thermostat and Operation and Application Guide. -
Page 4: To Remove Existing Thermostat
To Remove Existing Thermostat WARNING ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat. 1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker off. -
Page 5: Remote Sensor Installation (Optional)
3. Tighten screws on terminal block. Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper terminal. 4. Remove unused Gas/Electric jumper. Keep gas for oil or gas systems. Keep electric for heat pumps or electric heat systems. -
Page 6: Wiring Diagram
Wiring Diagram 6-Wire,... -
Page 7: Configuration Mode
Configuration Mode The configuration mode is used to set the McQuay 668811101 thermostat to match your heating/cooling system. The McQuay 668811101 thermostat functions with heat pump, air conditioning, gas, oil or electric heat systems. 1. To enter the configuration mode, simultaneously hold down the buttons while the McQuay 668811101 thermostat is in OFF mode. - Page 8 4. Heat pump – Press the button to configure as heat pump, or non-heat pump system. • ON = Heat pump system – 4 minute time delay with heat and cool • OFF = Non-heat pump system – 4 minute time delay with cool only Press the PROG button to advance to the next screen 5.
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Page 9: Starting The Thermostat
8. Room temperature offset (+9°F to - 9°F) (+5°C to -5°C). Adjust to calibrate displayed room temperature to match actual room temperature. Press the PROG button to advance to the next screen. 9. Maximum compressor cycles allowed per hour (d, 2-6). –... -
Page 10: Testing The Thermostat
Testing the Thermostat Once the thermostat is installed, it should be thoroughly tested. CAUTION Do not energize the air conditioning system when the outdoor temperature is below 50 degrees. It can result in equipment damage or personal injury. Cool Test 1. -
Page 11: Mode Of Operation
668811101 thermostat thermostat into a 2 hour temporary hold. After 2 hours, it will automatically return to the program schedule. The McQuay 668811101 thermostat also has a button lockout feature. This enables the thermostat to be set to the proper mode and temperature and locked so it cannot be tampered with. -
Page 12: Operating Modes
Operating Modes There are six possible operating modes for the McQuay 668811101 thermostat. Off, Cool, Heat, and Cool & Heat modes are accessed by pressing the Mode button. Program mode is accessed by pressing the Prog button. Continuous fan mode is accessed by setting the auto/on switch to ON. -
Page 13: Setting The Time And Day Of The Week
Setting the Time and Day of the Week The time and day of the week must be set for your program schedule to operate correctly. 1. Press the MODE button until you are in the OFF mode. 2. Press the PROG button in for 6 seconds. Time displays. 3. -
Page 14: Programming
Each period will have a start time, heat temperature, and cool temperature. The McQuay 668811101 thermostat monitors the day and time, while maintaining the specific conditions you have chosen for each period in your program. - Page 15 • Set time is displayed 8. Press the button to change set time. 9. Press the PROG button to advance to the next screen. Note: Transitions required after 11:59 PM must be programmed in the next day’s MORN transition. • Heat temperature is displayed (45°F to 90°F) 10.
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Page 16: Simpleset® Programming
3. Press and hold the PROG button for 5 seconds to exit program mode and return to the OFF mode. Lockout Function The McQuay 668811101 thermostat thermostat has a button lockout feature so the settings cannot be changed or tampered with. With the lockout activated, any button press will result in “LOC” being displayed. -
Page 17: Factory Preprogramming
Factory Preprogramming The McQuay 668811101 thermostat comes preprogrammed with the following schedule: MORN 6:00 AM 8:00 AM 6:00 PM NITE 10:00 PM MONDAY thru HEAT HEAT HEAT HEAT 70°F 62°F 70°F 62°F SUNDAY COOL COOL COOL COOL 78°F 85°F 78°F 82°F... - Page 18 THURSDAY MORN NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FRIDAY MORN NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL SATURDAY MORN NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL SUNDAY MORN NITE HEAT HEAT HEAT HEAT COOL COOL COOL...
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Page 19: Troubleshooting
Troubleshooting Symptom Remedy No display Check for 24 VAC at thermostat; display is blank when 24 VAC is not present System fan does not come on properly Verify wiring is correct All thermostat buttons are inoperative Verify 24 VAC is present; unit locks out when 24 VAC is not present No response with first button press First button press activates backlight only Program schedule activates at the wrong time... - Page 20 McQuay Training and Development Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.
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