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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.
Warranty
All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product
Warranty. Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your
local McQuay Representative, go to www.mcquay.com.
This document contains the most current product information as of this printing. For the most up-to-date product
information, please go to
www.mcquay.com.
LIAF015 / Version A: 03-23-09
Installation,
Operation & Application Guide
LIAF015
Group: WSHP
Supercedes: N/A
Date: 03-23-09
Programmable Electronic Thermostat
7-Day Programmable, Auto Changeover, Fan Speed Control, Hardwire
Part No.668811101
Specifications
Electrical Rating: • 24 VAC (18 to 30 VAC)
• 3 amp maximum total load
• 1 amp maximum per terminal
Temperature control ranges: 45°F to 90°F Accuracy: ± 1°F
System configurations: 1-stage heat, 1-stage cool, heat pump, gas, oil, electric
Timing:
Anti-short Cycle
: 5 minutes
Backlight Operation
: 10 seconds
Terminations: C, RH, RC, W, Y, B, O, G1, G2, S1, S2
Important Safety Information
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 ......................................................................................................................... 7
Testing the Thermostat .......................................................................................................................... 8
Mode of Operation ................................................................................................................................. 9
Operating Modes ................................................................................................................................. 10
Setting the Time and Day of the Week ................................................................................................ 11
Programming ....................................................................................................................................... 12
Simpleset
®
Programming ..................................................................................................................... 14
Lockout Function ................................................................................................................................. 14
Factory Preprogramming ..................................................................................................................... 15
Personal Program Schedule ................................................................................................................ 15
Troubleshooting ................................................................................................................................... 17
MORN
DAY
EVE
NITE
HEAT
HEAT
HEAT
HEAT
COOL
COOL
COOL
COOL
THURSDAY
4
MORN
DAY
EVE
NITE
HEAT
HEAT
HEAT
HEAT
COOL
COOL
COOL
COOL
FRIDAY
5
MORN
DAY
EVE
NITE
HEAT
HEAT
HEAT
HEAT
COOL
COOL
COOL
COOL
SATURDAY
6
MORN
DAY
EVE
NITE
HEAT
HEAT
HEAT
HEAT
COOL
COOL
COOL
COOL
SUNDAY
7
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
Check time (AM/PM) set on thermostat (see “Setting the Time,” Page
11)
Thermostat turns on and off too frequently
Adjust temperature differential (see “Configuration Mode Setting 2,”
Page 5)
Thermostat does not follow program
Verify it is operating in program mode (PROG displays); check time
(AM/PM); check if in 2 hour program override
Fan runs continuously
Check Fan On/Auto switch, fan runs continuously in On position
Status indicator light not on during call
Turn status indicator function on
(see “Configuration Mode Setting 10,” Page 7)
Room temperature is not correct
Calibrate thermostat (see “Configuration Mode Setting 8,” Page 7).
If remote sensor is used, check S1 and S2 terminal connections
LOC displays when any button is pressed
Thermostat has the button lockout function activated (see “Lockout
Function,” Page 14)
– – on display instead of room temperature
Check for a bad connection at S1 and S2 terminals, if used
Problem not listed above
Press Reset button once*
* Reset Button Function: Time, day and mode changed to last saved settings (saved after power loss or when exiting
program setup), configuration and program settings are unchanged.
• 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
For replacement parts call 1-800-377-2787
©2008 McQuay International • www.mcquay.com • 800-432-1342
For replacement parts call 1-800-377-2787
©2008 McQuay International • www.mcquay.com • 800-432-1342
1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker
off.
2. Remove old thermostat. This should expose the wires.
3. Label the existing wires before removing wires.
4. After labeling wires, remove wires from wire terminals.
5. Refer to the following section for instructions on how to install this thermostat.
To Remove Existing Thermostat
To Install Thermostat
IMPORTANT: Thermostat installation must conform to local and national building and electrical codes and
ordinances.
1. Turn off power to the heating and cooling system by removing the fuse or switching the appropriate circuit breaker
off.
2. Insert stripped, labeled wires in matching wire terminals. See “Wiring Diagrams” section of this manual.
WARNING
Be sure exposed portion of wires does not touch other wires.
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.
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.
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.
5. Replace thermostat by snapping it in place.
6. Turn on power to the system at the main service panel.
7. Test thermostat operation as described in “Testing the Thermostat”.
Remote Sensor Installation (Optional)
1. Remove cover from remote sensor housing.
2. Select an appropriate location for mounting the remote sensor.
3. Mount remote sensor unit using hardware provided.
4. Install two strand shielded wire between remote sensor and thermostat. Shielded wire must be used. Do not run
remote sensor wire in conduit with other wires.
•
Wire 1 should run between the S1 terminal on the thermostat and the S1 terminal on the remote sensor
•
Wire 2 should run between the S2 terminal on the thermostat and the S2 terminal on the remote sensor
• Connect the shielding of the wire to the S2 terminal on the thermostat
5. Disable the main sensor (R12) on the thermostat by cutting it from the circuit board.
WARNING
Always turn off power at the main power supply before installing, cleaning, or removing thermostat.
• This thermostat is for 24 VAC applications only; do not use on voltages over 30 VAC
• Do not short across terminals of gas valve or system control to test operation; this will damage your thermostat
and void your warranty
• All wiring must conform to local and national electrical and building codes
• 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.
All manuals and user guides at all-guides.com
