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Installation,

Operation & Application Guide

LIA303

Group: WSHP
Supercedes: N/A
Date: 03-23-09

Programmable Electronic Thermostat

1 Heat/1 Cool, Auto Changeover, Fan Speed Control, Hardwire
Part No. 668811301

For replacement parts call 1-800-377-2787
©2008 McQuay International • www.mcquay.com • 800-432-1342

• 7-Day, 5-2-Day or 5-1-1-Day Programmable
• Configurable
• Single-Stage Heat/Cool Systems
• Single-Stage Heat Pump Systems
• Two-Speed Fan Speed Selection
• Large Display With Backlight
• Selectable Fahrenheit or Celsius
• Compatible with Gas, Oil, or Electric
• SimpleSet™ Field Programming
• Status Indicator Light
• Relay Outputs (minimum voltage drop in thermostat)
• Remote Sensor Compatible
• Ideally Suited for:

– Residential (New Construction/Replacement)
– Light Commercial

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Содержание LIA303

Страница 1: ...w mcquay com 800 432 1342 7 Day 5 2 Day or 5 1 1 Day Programmable Configurable Single Stage Heat Cool Systems Single Stage Heat Pump Systems Two Speed Fan Speed Selection Large Display With Backlight Selectable Fahrenheit or Celsius Compatible with Gas Oil or Electric SimpleSet Field Programming Status Indicator Light Relay Outputs minimum voltage drop in thermostat Remote Sensor Compatible Ideall...

Страница 2: ... Thermostat 4 Wiring Diagrams 5 Remote or Outdoor Sensor Installation Optional 9 Configuration Mode 10 Configuration Mode Settings 11 Mode of Operation 16 Operating Modes 17 Testing the Thermostat 19 Setting the Time and Day of the Week 20 Programming 21 Lockout Feature 23 Factory Preprogramming 24 Personal Program Schedule 24 SimpleSetTM Field Programming 26 Troubleshooting 27 ...

Страница 3: ...1 RESET CONFIG RC RH Parts Diagram Configuration switch Reset switch Left system button Right fan button Down button Up button Field programming pins RC RH jumper FP Fan Speed Switch ...

Страница 4: ...fset activated Electrical rating 24 VAC 18 30 VAC 1 amp maximum per terminal 3 amp maximum total load Temperature control range 45 F to 90 F 7 C to 32 C Accuracy 1 F 0 5 C System configurations 1 stage heat 1 stage cool heat pump gas oil electric Timing Anti short Cycle 4 minutes Backlight Operation Terminations S1 S2 Y W O B G2 G1 RC RH C ...

Страница 5: ...ve existing thermostat base from wall 6 Refer to the following section for instructions on how to install this 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 This thermostat is for 24 VAC applications only d...

Страница 6: ...5 Set thermostat base and cover away from working area 6 Using a 3 16 drill bit drill holes in the places you have marked for mounting 7 Use a hammer to tap supplied anchors in mounting holes 8 Align thermostat base with mounting holes and feed the control wires through slit in thermal intrusion barrier and into wire opening 9 Use supplied screws to mount thermostat base to wall 10 Insert stripped...

Страница 7: ...ansformer Wiring Diagrams 13 Configure thermostat see Page 12 to match the type of system you have 14 Replace cover on thermostat by snapping it in place 15 Test thermostat operation as described in Testing the Thermostat Page 19 ...

Страница 8: ...6 Hardwired 6 Wire Two Transformer Both transformers must be in phase Hardwired 5 or 6 Wire Single Transformer IMPORTANT Before wiring remove pre installed RC RH jumper ...

Страница 9: ...7 Hardwired Cool or Heat Active Reversing Valve ...

Страница 10: ...8 Hardwired 5 Wire Single Transformer ...

Страница 11: ...e 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 Configure the thermostat to operate with the remote sensor see Configuration Mode setting 10 Pa...

Страница 12: ...switch for 1 second Press the up or down button to change settings within each screen Down button Up button Press the right button to advance to the next screen Note Pressing the left button will return you to the previous screen Left button Right button The configuration mode is used to set the McQuay thermostat to match your heating cooling system The McQuay thermostat functions with heat pump a...

Страница 13: ...dband value Press the right button to advance to the next screen 2 Temperature Differential 1 F to 5 F 0 5 C to 2 5 C Set the number of degrees between your setpoint temperature and your turn on temperature Press the up or down button to set differential value Press the right button to advance to the next screen 1 Temperature Scale F or C Choose Fahrenheit or Celsius Press the up or down button to...

Страница 14: ...non heat pump reversing valve operation and number of compressors in your system Choose between two heat pump settings or gas oil or electric Choose System Reversing Valve Active Number of Compressors or Compressor Stages Type of Heat Heat Pump HP O Cool Active 1 HP b Heat Active 1 Non Heat Pump Heat Gas Oil Heat Electric ...

Страница 15: ...de cannot be changed when the thermostat is locked Press the up or down button to select Press the right button to advance to the next screen 6 Maximum Heat Setpoint 45 F to 90 F 7 C to 32 C Adjust to control the maximum heat set temperature allowed Press the up or down button to select Press the right button to advance to the next screen 7 Minimum Cool Setpoint 45 F to 90 F 7 C to 32 C Adjust to ...

Страница 16: ...utton to select Press the right button to advance to the next screen 9 Maximum Cycles Allowed Per Hour 2 6 as many as needed 2 6 maximum cycles hour Press the up or down button to select Press the right button to advance to the next screen 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 Note When not set to 0 will disp...

Страница 17: ...ONFIG button for 2 seconds to exit configuration OFF 11 Cooling Fan Delay Off Time 0 30 60 90 seconds Select the fan purge time for cooling Press the up or down button to select Press the right button to advance to the next screen Note The McQuay control board provides a minimum Fan Off delay of 30 seconds even if the thermostat is set for a 0 second delay ...

Страница 18: ... compressor The McQuay thermostat has five possible operating modes OFF Heat Cool Heat Cool and Program mode In off mode the thermostat will not turn on heating or cooling devices The manual fan can be turned on in all operating modes using the fan button and the fan speed can be set in all operating modes using the fan speed switch In heat mode the thermostat controls the heating system In the co...

Страница 19: ...Note The fan speed can be set in all operating modes using the fan speed switch OFF Heat Mode In this mode the thermostat controls the heating system When the heat outputs the flame icon apprears on the display Note For heat pumps there is a four minute delay for your compressor to restart after it has turned off Cool Mode In this mode the thermostat controls the cooling system When the cooling ou...

Страница 20: ...e cool and heat mode Program Mode In this mode the program function is on PROG displays and the thermostat will automatically be controlled by the set program schedule Program mode can function with heat mode cool mode or heat cool mode The program schedule can be overridden by changing the set temperature up or down button After 2 hours the program schedule will automatically be resumed To manual...

Страница 21: ...e for 5 seconds PM Cool Test 1 Press SYS left button until cool mode is displayed 2 Adjust set temperature so it is 5 degrees below room temperature 3 A C should come on within a few seconds Green LED may turn ON 4 Adjust the set temperature 2 degrees above the room temperature and the A C should turn off There may be a fan delay on your system Note There is a four minute time delay to protect the...

Страница 22: ...nds to lock values into memory and return to the OFF mode or press the FAN right button once to enter programming 4 Press the FAN right button once to select minutes minutes flashing Press the up or down button to adjust the minutes 3 Time displays hour flashing Press the up or down button to adjust the hour 2 Press and hold the PROG button SYS left and FAN right buttons pressed simultaneously in ...

Страница 23: ...ns Note The days of the week shown on the display will be programmed simultaneously The screens are listed below Screen 1 SUN MON TUE WED THU FRI SAT Screen 2 MON TUE WED THU FRI Screen 3 MON Screen 4 TUE Screen 5 WED Screen 6 THU Screen 7 FRI Screen 8 SUN SAT Screen 9 SAT Screen 10 SUN Program Overview The McQuay programmable thermostat has four periods MORN DAY EVE NITE that are customizable for...

Страница 24: ... different minutes Press FAN right button to advance to the next screen Heat set temperature displays Use the up or down button to adjust the heat set temperature Press FAN right button to advance to the next screen Cool set temperature displays Use the up or down button to adjust the cool set temperature Press FAN right button to advance to the next screen Programmable fan screen displays Use the...

Страница 25: ...adjustment is limited Select the appropriate lockout from Configuration Mode Settings Step 5 Page 13 of this guide To activate the LOCK feature 1 Simultaneously press the SYS FAN and UP buttons for 10 seconds 2 will display and the lockout function will be enabled To deactivate the LOCK feature repeat steps 1 and 2 above ...

Страница 26: ...sonal Program Schedule MORN DAY EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN MONDAY 1 TUESDAY 2 MORN DAY EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN WEDNESDAY 3 MORN DAY EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN Use the following personal program schedule to record your settings The McQuay thermostat comes preprogrammed with the follo...

Страница 27: ...Y EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN MORN DAY EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN MORN DAY EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN MORN DAY EVE NITE HEAT HEAT HEAT HEAT COOL COOL COOL COOL FAN FAN FAN FAN ...

Страница 28: ...Press the up and down buttons and CONFIG switch simultaneously for 5 seconds to exit from data transfer mode and to return the master to the OFF mode 7 Turn off power to the master and remove it from the wall 8 Connect the master to the target using the 3 wire connector Attach one end to the Master s FP pins and the other end to the Target s FP pins Note Target thermostat must be powered with 24 V...

Страница 29: ... turn fan off Fan turns on occasionally Program Mode Check programmable fan setting in program schedule see Page 22 Status indicator light not on during call Turn status indicator function on see Configuration Mode Setting 12 Page 15 Room temperature is not correct Calibrate thermostat see Configuration Mode Setting 8 Page 14 If remote sensor is used check S1 and S2 terminal connections displays w...

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Страница 31: ...This page left blank intentionally ...

Страница 32: ...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 mcq...

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