Bryant T6-NHP User's Manual
Contents
1. Y1 used for multi speed cooling Y1 stage 1 Y2 stage 2 A07687 Fig 7 Control Module Wiring Guide HUM terminal is not used on this model e Red is V e Black is Vg 13 A07166 Fig 8 Secure Wires to Terminal Strip A07167 Fig 9 Connect Pigtail Wires to Display Module 14 NOTE The 2 wire pigtail is not intended to support the weight of the User Interface Do not hang the User Interface from the equipment Control Module screw terminals e Red is V e Black is Vg 7 Push any excess wire into wall and against mounting base Seal hole in wall to prevent air leaks Leaks can affect operation and cause incorrect temperature and or humidity measurement 8 Make sure to attach 2 wire pigtail to Display Module mounting base It is packed loose in the box from the factory Then attach 2 wire pigtail to the back of the Display Module via 2 pin keyed connector 9 Reattach Display Module body to mounting base by first setting on at top of mounting base and then push bottom corners of Display Module to snap into place See Fig 10 A07169 Fig 10 Attach Display to Backplate 15 10 Find suitable indoor mounting location for Equipment Control Module either near or on equipment See Fig 11 IMPORTANT NOTE Equipment Control Module should not be mounted to duct work or below any other controls or equipment i e humidistat humidifier etc A07217 Fig 11 Equi2. A09175 Fig 20 Fan Coil with Air Conditioner 52 WIRING DIAGRAMS cont Thermostat Fan Coil RVS Heat Stage2 Lop we Heat Stage 1 W W1 Compressor Lyx Not Used Ly Fan 24VAC Hot Heating qd Rh t 24VAC Hot Cooling Dry Contact 1 Dry Contact 2 24VAC Common Outdoor Air Temp OAT Remote Room Sensor RRS Outdoor Sensor OAT RRS Com OATIRRS Remote Room Lt Sensor Indicates connection may not be required available A09156 Fig 21 Fan Coil shown with Auxiliary Connection 2 Heat pump air conditioner removed for clarity 53 WIRING DIAGRAMS cont Thermostat Furnace Air Conditioner Heat Stage 2 Heat Stage 1 Compressor Not Used Fan 24VAC Hot Heating gt pion O ja 2 lt 24VAC Hot Cooling lo Dry Contact 1 Dry Contact 2 IT if 24VAC Common Outdoor Air Temp s Remote Room Sensor OAT RRS Com Outdoor Sensor Sensor T 1 i i Remote Room i 1 i i 1 Indicates connection may not be required available A09157 Fig 22 Furnace with Air Conditioner 54 WIRING DIAGRAMS cont Thermostat RVS Heat Stage 2 Heat Stage 1 Compressor Not Used Fan 24VAC Hot Heating 24VAC Hot Cooling Dry Contact 1 Dry Contact 2 24VAC Common Outdoor Air Temp OAT Remote Room Sensor RRS OAT RRS Com OAT RRS A09158 Fig 23 Thermostat with Dry Cont
3. m Sensor OAT RRS Com Remote Room i Indicates connection may not be required available Some heat pumps may designate W1 A09154 Fig 18 Fan Coil with Heat Pump HP Thermostat 50 WIRING DIAGRAMS cont Thermostat Fan Coil RVS Heat Stage 2 0 78 W2 7 __w3_ Heat Stage 1 N Compressor Not Used Fan K D F 24VAC Hot Heating pa 24VAC Hot Cooling f po e g H 7 i lt Dry Contact 1 Dry Contact 2 g i t i i i i i H i i i i i i i i i i i i H i i i i i i i gt Cc x Q 5 5 D 3 on 5 i i i 24VAC Common Outdoor Air Temp gt a D Remote Room Sensor RRS 5 Outdoor Sensor OAT RRS Com OATIRRS _Remote Room 1 Sensor Indicates connection may not be required available A09155 Fig 19 Fan Coil shown with Auxiliary Connection 1 51 WIRING DIAGRAMS cont Thermostat Fan Coil Air Conditioner RVS Heat Stage 2 Heat Stage 1 Compressor lt Not Used Fan 24VAC Hot Heating 24VAC Hot Cooling e D 1 H 1 Dry Contact 1 Dry Contact 2 IT if 24VAC Common Outdoor Air Temp s 4 i i T Remote Room Sensor a Outdoor Sensor i i i OAT RRS Com T i i i Remote Room Sensor i i i i Indicates connection may not be required available
4. SUMMARY Option 01 Equipment Type Option 02 Clean Filter Timer Adjustment Option 03 Fahrenheit Centigrade Selection Option 04 Fan G on with W W1 Selection Option 05 Room Air Temperature Sensing programmable models only Option 06 Cooling Lockout Below 55 F 13 C Selection only available if outdoor air sensor is present Option 07 Zoning Option 08 Auxiliary Heat Lockout Temperature Setting only available when heat pump is used and when outdoor air temperature sensor is present Option 10 Reversing Valve Option 11 Adjustable Setpoint Deadband Option 12 Smart Recovery programmable models only Option 13 Room Temperature Offset Adjustment Option 15 Enable Auto Mode Option 16 Cycles Per Hour Option 17 Time Between Stages 22 Option 18 Option 19 Option 20 Option 21 Option 24 Option 25 Option 26 Option 27 Option 28 Option 29 Option 30 Option 31 Option 32 Option 33 Option 41 Option 44 Option 99 Backlight Configuration Dry Contact programmable models only Outdoor Air Temperature Offset Adjustment Keypad Lockout Programmable Non Programmable programmable models only Number of Programmable Periods per Day programmable models only Minimum Cooling Setpoint Maximum heating Setpoint UV Light Reminder Humidifier Pad Reminder Programmable Fan programmable models only Daylight Savings Time Configuration programmable model
5. 16 C 85 F 29 C Evening 5 00 PM 68 F 20 C 78 F 26 C Sleep 10 00 PM 60 F 16 C 82 F 28 C If the programmed schedule is to be used make sure the triangle icon next to the FOLLOW SCHEDULE icon is turned on Pressing the Schedule button will cycle the triangle icon through the FOLLOW SCHEDULE HOLD and VACATION selections 39 If fixed temperatures are desired use SCHEDULE button to turn on arrow icon next to HOLD This will maintain setpoints not allowing them to change with programmed schedule The FAN button may be used to select between AUTO fan on only with equipment and On fan on continuously fan modes For further information on temperature selection and programming refer to Homeowner s Guide Setting The Clock Calendar Daily Schedule and Vacation Settings programmable models only To set the clock press the SET button once The Clock will be displayed at the bottom center of the screen Use the soft keys to move the box around the digits to be set and the UP DOWN buttons to change the setting Concurrent presses of the set button will cycle through the calendar daily schedule and vacation settings Calendar may be changed by using the soft keys to select the Month Day or Year The UP DOWN buttons are used to change the Month Day or Year setting when the box surrounds it Day of the week Mon Sun is determined by calendar settings and is not directly adjustable When changing daily schedule set
6. attach to Equipment Control Module terminal block terminals V and Vg Attach 2 wire pigtail to the back of the Display Module via 2 pin keyed connec tor Reattach Display Module body to Equipment Control Module by first setting on at top and then push bottom corners to snap into place See Fig 15 20 A07221 Fig 15 Reattach Display Module 9 Turn on power to equipment On power up all display segments will light for 5 sec For the next 5 sec a 2 digit code appears on large display which identifies AC HP Control configuration Refer to Option 33 a AC 1 stage air conditioner AC with furnace or fan coil b HP 1 stage heat pump HP only with fan coil c H heating only system furnace only or fan coil with electric heat only d C cooling only system AC with fan coil e H2 2 stage heat pump with fan coil f A2 2 stage air conditioner with fan coil or furnace Set AC HP Control Configuration Configuration options enable the installer to configure the thermostat for a particular installation Most are not presented to the homeowner and therefore 21 must be properly set by the installer Only those marked with an asterisk below are available to the homeowner The homeowner configurations are described in the owner s manual A special procedure allows entry into the configuration mode Description of each selection and how to use the configuration mode follows CONFIGURATION OPTIONS
7. between Display Module and Equipment Control Module These two wires V and Vg do not provide ordinary 24VAC They carry a combination of power and communications data that is unique to these products Ss TWIST OFF A07052 Fig 1 PCB Breakout Jumper Models There are programmable and non programmable models for all applications They can be configured for AC or HP installations allowing it to be used in place of all Bryant thermostats Programmable thermostats may be configured as non programmable if user desires Outdoor Temperature Sensor The outdoor air temperature sensor is not included with the AC HP Control It is available as an accessory part number TSTATBBSENO1 B Optimum performance is obtained when an outdoor temperature sensor is used with the AC HP Control Plan installation so that 2 wires can be run from Equipment Control Module to an outdoor location preferably on the north side of the house or refer to Installation Instructions included with the outdoor temperature sensor for simplified connection Sensor can be mounted to outdoor unit and existing dedicated sensor wires may be used for its connection Details are provided in sensor instructions Remote Indoor Temperature Sensor A remote temperature sensor may be used with the programmable heat pump and programmable air conditioner thermostats where it is desirable to install the thermostat in a limited access location while measuring the temperature i
8. configured the O W2 B output to function as a B output During heat pump heating a defrost signal shall be considered valid if the compressor output is energized and the defrost signal has been active for less than 15 consecutive minutes Any defrost signal present for longer than 15 minutes shall be considered invalid Heat pump fan coil systems shall use this input to 42 e Detect that defrost is in progress and energize the auxiliary heat to provide homeowner comfort during the defrost cycle e Allow a defrost cycle to run to completion regardless of the system demand Three Minute Minimum on Time In normal operation when a stage turns on it will not turn off for a minimum of 3 minutes If the setpoint is changed this timer is canceled allowing the equipment to turn off immediately when the demand is removed Heat Cool Setpoints Desired Temperature A minimum difference of 1 and maximum of 6 is enforced between heating and cooling desired temperatures This is done by allowing 1 setting to push the other to maintain this difference This difference is adjustable via Configuration Option 11 Equipment On Indicators When cooling equipment is on a COOL ON icon is displayed While cooling equipment operation is delayed by the timeguard or cycle timer COOL ON will flash The same is true for HEAT ON During second stage compressor operation a 2 will be displayed with the HEAT ON or COOL ON icon This is displayed
9. minimum on time is still controlled by the thermostat Default is OF off Option 08 Auxiliary Heat Lockout Temperature This selection is available on heat pump systems with a valid outdoor temperature sensor connected Available settings are Off 5 10 15 20 25 30 35 40 45 50 55 OF off function is disabled Auxiliary heat is allowed to operate whenever sufficient demand for heat is available 5 to 55 F 15 to 13 C Outdoor temperature above which the auxiliary heat is not allowed to operate unless MODE is set to Emergency Heat If room temperature falls below 45 F 7 C the auxiliary heat will be allowed to turn on and will continue to run until demand is satisfied Default is OF off Option 10 Reversing Valve This selection is only available on heat pump systems O terminal can be configured to be energized in either heating mode or in cooling mode depending on heat pump operation O is used to describe a heat pump system that energizes its reversing valve in cooling B is used to describe a heat pump system that energized its reversing valve in heating H Reversing valve output O W2 B is energized when HEAT mode is selected 27 C Reversing valve output O W2 B is energized when COOL mode is selected Default is C Option 11 Deadband Setting Between Heat amp Cool This option is not available on Heat Only and Cool Only systems This selection is to allow the
10. models only Option 31 Daylight Savings Time Configuration programmable models only Option 32 Furnace Heat Staging Option 33 Single or Two Piece Installation Option 41 Variable Speed Blower Option 44 Super Comfort Heat Options with an asterisk can also be set changed by the homeowner 60 2009 Bryant Heating amp Cooling Systems 7310 W Morris St Indianapolis IN 46231 Printed in U S A Edition Date 06 09 Catalog No IIT6 PAC 03 Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Replaces IIT6 PAC 02
11. prevents compressor from starting unless it has been off for at least 5 minutes It can be overridden for 1 cycle by simultaneously pressing FAN and UP buttons 41 Cycle Timer Based on the selection of 2 4 or 6 cycles per hour this timer is set to 30 15 or 10 minutes This much time must elapse from the start of one cycle before another cycle can start It serves to impose the cycles per hour limits It can be defeated for one cycle by simultaneously pressing the FAN and UP buttons Ten Minute Staging Timer In multistage heating or cooling this timer prevents any higher stage from turning on until preceding stage has been on for 10 minutes When staging between compressor and electric heat or between compressor and furnace heat the time is configurable The timer is configurable via Option 17 This timer is overridden if temperature error is greater than 5 usually due to a large change in desired temperature and equipment stages up in 60 second intervals The ten minute staging timer does not require the thermostat to change to a higher stage after 10 minutes If the system is able to meet the demand maintain setpoint it may not change stages after the 10 minute timer has expired If there is sufficient demand for a higher stage at the end of 10 minutes or at any time after the 10 minute timer has expired the thermostat will energize the next higher stage Defrost Detection of defrost will not work properly if the installer has
12. when the thermostat is configured as H2 A2 or h2 When the W is energized in a heat pump the auxiliary heat on icon will be displayed Auto Changeover When auto changeover mode is selected a change from heat to cool or vice versa will not occur until an opposite mode demand has existed for 20 minutes If setpoint is changed 20 minute requirement is deleted 43 Emergency Heat Mode When AC HP Control is configured as a heat pump and emergency heat is selected all Y signals are locked out and W becomes energized upon a call for heat Programmable Fan programmable models only The fan output can be programmed based on period of the day When programming for each day and period the fan can be set to On or AUTO If the fan button is pressed to change from On to Auto or vice versa when programmable fan has been enabled the manual change will only remain in effect until the next program period when the programmable fan setting will be changed per the scheduled setting Dry Contact On the programmable models the dry contact that can be used for control of an auxiliary device The dry contact may be configured to be closed for a specific number of minutes per hour for each period of the program schedule This can be used to operate a ventilator damper system blower or other auxiliary device There are two terminals D1 and D2 If it is desired to operate a ventilator or other device the D1 and D2 terminals can be connected
13. with the safety alert symbol DANGER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies a hazard which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation 1 INTRODUCTION Bryant s 7 day 5 2 day 1 day programmable and non programmable Preferred Series Thermostat Control is a wall mounted low voltage temperature control in either a single unit or a two piece unit In two piece configuration the relays are located near the equipment and a two wire connection is used between the Display Module and the Equipment Control Module Single piece installation requires more wiring and results in a higher profile The Preferred Series Thermostat has no need for batteries to store user configured settings in memory During power loss its internal memory saves settings for unlimited time and the clock continues to run for at least 24 hours An extension of Bryant s proven line of thermostats it provides separate setpoints for heating and cooling In the control s programmable configuration different heating and cooling setpoints and times are programmable for 4 periods per day or 2 periods per day Programming can be done for 7 days per week 5 2 days per week or 1 d
14. F Some auxiliary heaters require separate G signal to turn on blower In this case select On Default is OF off Option 05 Room Air Temperature Sensing programmable models only The remote room sensor may be installed as a single sensor or multiple sensors may be installed for further averaging functionality See Fig 16 25 RRS SRTN 4 Sensor 1 Sensor 2 Sensor 3 Sensor 4 A09130 Fig 16 Remote Room Sensor Parallel Wiring This selection determines which sensor the control will use for measuring room air temperature Room air temperature can be sensed in one of three ways the local sensor L located on the Display Module the remote room air sensor r or the average of local and remote sensors Lr Settings are L r Lr Default is L Option 06 Cooling Lockout Below 55 F This selection disables cooling when outdoor temperature is below 55 F 13 C It requires an outdoor temperature sensor Setting is not available if valid outdoor sensor is not connected Set to OF off to allow cooling below 55 F 13 C Set to On to prevent cooling below 55 F 13 C Factory default is OF off 26 Option 07 Zoning This selection should be set to On when the thermostat is to be used as part of a zoning system It is assumed that the zoning equipment will take care of time guard and cycle timers The
15. HARD COOL COOL HEAT HEAT HEAT HEAT EM EM CONFIG WARE STG 1 STG 2 STG 1 STG 2 STG 3 STG4 HEAT HEAT OPTION 01 CONFIG STG 1 STG 2 Yiw2 Y1 W2 2SPD HP Yiw2 Y1 W2 YN2 YY2 avs B 7 YIM2 yya owap orn ona wmi OM2 B Wi If HP or AC Heat Only 2S board HP Unit Ae WWI AND Opt32 2 Cool Only Y1W2 Unit mal T YN2 F 7 E 7 7 Cool Only AC Unit HP vive 48 WIRING DIAGRAMS Display module Display module wall mount Equipment Control Module Fan Coil Heat Pump ve v Ma H Va V vw RVS Heat Stage 2 OB W2 Va Va Heat Stage 1 wai F Compressor vep Not Used Yi Fan G amp F 24VAC Hot Heating Rh F 24VAC Hot Cooling __Re Dry Contact D1 F Dry Contact2 Hoz 24VAC Common c Outdoor Air Temp OAT_ Remote Room Sensor RRS_ S aa OATIRRS Com OATRRS Rek i Sensor Indicates connection may not be required available A09174 Fig 17 Display to Equipment Control Module Connection 49 WIRING DIAGRAMS cont Thermostat Fan Coil Heat Pump RVS Heat Stage 2 Heat Stage 1 Compressor Not Used Fan 24VAC Hot Heating 24VAC Hot Cooling pee Dry Contact 1 Dry Contact 2 24VAC Common Outdoor Air Temp Remote Room Sensor Outdoor Sensor
16. Option 11 such that the minimum of the range is 50 F 10 C and the maximum is 90 F 32 C minus the deadband Default is 88 F 31 C based on the adjustable deadband default 2 Option 28 UV Light Reminder This selection allows the installer to select the number of months after which the UV Light icon will be displayed to indicate to the homeowner that it is time to call the dealer to have the UV Lights replaced Selections available are OF off 6 12 18 24 30 36 42 48 OF off The UV Light reminder is turned off and will never be displayed 6 48 The number of months after which the UV Light reminder will be displayed CHECK UV LIGHT Default is OF off Option 30 Programmable Fan programmable models only This selection allows the homeowner to program the fan selection to Auto or On fan operation for each of the program schedule periods This selection is only available on programmable models OF off Programmable fan is disabled and the homeowner must manually select Auto or On for fan operation On Programmable fan is enabled The homeowner can program Auto or On fan operation along with the heat and cool setpoints for each programmed period When the program schedule is running the programmed heat setpoint cool setpoint and fan selection for that period will be used If the homeowner 34 overrides the programmed fan setting by pressing the fan bu
17. T6 PAC T6 PHP T6 NAC T6 NHP PREFERRED SERIES AC HP THERMOSTAT 68 om i G 2 0 l T A07045 A07044 Programmable Control Non Programmable Control Pb CE Designed and Assembled in the U S A NOTE Read the entire instruction manual before starting the installation US patents US7287709 B2 US20080147242 A1 USD582800 SI US20060165149 A1 US6956463 B2 TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS esoteran ri cc cece eee 1 INTRODUCTION jo siinc ticks eyes atin dik a a ean ls Mean aed Be 8 toca E gobs Atal and dhs 2 INSTALLATION CONSIDERATIONS 0 00 eee eee eee 3 INSTALLATION pre rs arepe a es wae Saas ee as Bee ees VR ees 6 SYSTEM START UP AND CHECKOUT 000 000 0008 38 OPERATIONAL INFORMATION 0 0 cece eee 41 TROUBLESHOOTING iae a D lai tae aie E A waa eh aes 45 WIRING DIAGRAMS 0 cc cece eens 49 THERMOSTAT CONFIGURATION RECORD 0 000 58 SAFETY CONSIDERATIONS Read and follow manufacturer instructions carefully Follow all local electrical codes during installation All wiring must conform to local and national electrical codes Improper wiring or installation may damage AC HP Control Recognize safety information This is the safety alert symbol AX When you see this symbol on the equipment and in the instruction manual be alert to the potential for personal injury Understand the signal words DANGER WARNING and CAUTION These words are used
18. Temperature only available if outdoor sensor is present An outdoor sensor is required for high cool latch feature This selection is only available when Option 1 is set to H2 A2 or h2 and when Option 7 zoning is set to OF off Configuration settings are OF off 80 85 90 95 100 105 110 On OF off Cooling always starts in low stage Y1 and stages up to high stage Y1 and Y Y2 when demand is sufficient and staging timer constraints have been satisfied 80 to 110 F 27 to 43 C Outdoor temperature above which both first and second stages of the compressor are energized to satisfy all cooling demands When a cycle starts under a high cool latch it will finish the cooling cycle on high stage On The Y1 and Y Y2 outputs are simultaneously energized to satisfy all cooling demands Default is OF off Option 23 High Heat Latch Temperature only available if outdoor sensor is present This selection is only available when Option 1 is set to H2 or h2 and Option 7 zoning is set to OF off Configuration settings are OF off 20 25 30 35 40 45 50 On OF off Heating always starts in low stage Y1 and stages up to high stage Y1 and Y Y2 when demand is sufficient and staging timer constraints have been satisfied 20 to 50 F 7 to 10 C Outdoor temperature below which both first and second stages of the compressor are energized to satisfy all heating demands 32 When a cycle starts und
19. act Control for Run Time 55 WIRING DIAGRAMS cont Thermostat Furnace Air Conditioner RVS Heat Stage 2 Heat Stage 1 Compressor Not Used Fan 24VAC Hot Heating 24VAC Hot Cooling Dry Contact 1 Dry Contact 2 24VAC Common Outdoor Air Temp Remote Room Sensor Outdoor Sensor OAT RRS Com Remote Room Sensor Indicates connection may not be required available A09159 Fig 24 2 Stage Furnace with Air Conditioner HP Thermostat Configured as AC 56 WIRING DIAGRAMS cont Single Stage Single Stage Thermostat Furnace Air Conditioner RVS Heat Stage 2 Heat Stage 1 Compressor Low Compressor High Fan 24VAC Hot Heating 24VAC Hot Cooling Dry Contact 1 Dry Contact 2 24VAC Common Outdoor Air Temp Remote Room Sensor Outdoor Sensor h OAT RRS Com Sensor 7 i i Remote Room i i i Indicates connection may not be required available NOTE Rc Rh jumper is cut on the Equipment Control Module A09160 Fig 25 Single stage Furnace with Air Conditioner and Split Power 57 THERMOSTAT CONFIGURATION RECORD Installer Model Number Date A Hardware Configuration B Mode Settings Seal Hole In Wall Mode Off Heat Cool Auto Em Heat Heating Setpoint Value Cooling Setpoint Value Fan Auto or On C Home Away Sleep Settings Heat Home Away Sleep Cool D Schedule For Programmabl
20. ange AC H C HP operates a single speed heat pump with a fan coil AC operates a single speed AC H operates a heat only system Furnace or fan coil only no outdoor unit C operates a cool only system Outdoor AC unit with an indoor fan coil with no strip heaters A2 2 stage air conditioner with a furnace or fan coil H2 2 stage heat pump with a fan coil 24 Defaults HP model defaults to HP AC model defaults to AC Option 02 Clean Filter Timer Select hours of blower operation heating cooling or fan before CHECK FILTER icon is displayed With OF selected icon will never come on disabling this feature Time selection can range from 800 to 7200 hr by selecting numbers 1 through 9 Time is 800 X number selected Default is 4 3200 hr Recommended selections are disposable filter 800 to 2400 hr media filter 2400 to 3200 hr or electronic air cleaner 1600 to 2400 hr of blower operation For higher efficiency filter please consult filter s Installation Instruction for details Option 03 Fahrenheit Centigrade Select between Fahrenheit F and Centigrade C operation Factory default is Fahrenheit F Option 04 Fan G On With W W1 This selection determines whether fan G output is to be On or OFF when any W W1 furnace or strip heat output is On Most furnaces and fan coils manage their own blowers and do not require separate G signal For these applications select OF
21. ay The programmable Thermostat Control can also be user configured as a non programmable Thermostat Control The non programmable Thermostat Control features Touch N Go settings for quick and easy temperature change without complicated programming schedules And its Touch N Go technology enables the user to switch between three different user configurable settings through intuitive buttons located just below the display INSTALLATION CONSIDERATIONS Power This control is powered by 24VAC only It requires 24VAC Rh and or Re and C terminals of the low voltage transformer to be connected to it for proper operation It will not operate without these 2 connections Rh and Rc are connected via PCB breakout jumper See Fig 1 For applications using two 24VAC transformers one in the indoor unit and one in the outdoor unit connect the common from each to the C terminal Connect R from the indoor unit to the Rh terminal Connect R from the outdoor unit to the Re terminal Then break jumper on the circuit board The W signal is taken from the Rh power and the G signal is taken from the Re power If thermostat has been installed in a two transformer application that is later changed to a single transformer installation installer must install a field supplied jumper between Rc and Rh Depending on the installation up to 14 wires may be required Installation as two piece unit is recommended Only 2 wires are required for connection
22. configuration and each operating mode When replacing a failed component such as an equipment control module or a display module the installer should replace both parts as a matched set It is very easy to accidentally mix an A C or HP display with a PAC equipment control module When this happens some functions appear in the setup while others do not This can be very confusing to troubleshoot Verify that both parts have the same model and serial number when troubleshooting the thermostat 46 Table 3 Equipment Configuration Outputs For COOL HEAT and Emergency Heat modes the following chart shows the state for each output in each stage of operation Equip HARD coo coo Heat Hear HEAT Heat EM EM CONFIG WARE sta1 sta2 sta1 sta2 sta3 sraa HEAT HEAT OPTION 01 CONFIG sta1 STG2 SS AC AC YIv2 Twm z wi HP OW2JB SS AC Hi YIN wm i Opt32 2 SS HP YIN2 YIN2 avs o0 P ow YN2 wi Ww YIN2 ge HP w Bes wat wm OW2 B SS HP Y2 YN2 YN2 YIN2 wmi RS 0 2 yN2 wet wmi ones OW2B wwa viwe Vine yaw YN2 SS HP vv ve RS B 25 yN2 g on wi yiwa Wa wmi ane t43 B B Opi On Ow2 oma OW2JB YN2 Wmi asppac 2s viwe Yia ww Oae YAW YAW ee Gell cee ae ee yz YiNe leg w2 wat 5 OW2B wmi 47 Table 3 Equipment Configuration Outputs cont EQUI
23. d of the equipment cycle the MODE will return to OFF The display will count down from 180 seconds to O for each stage when the equipment is energized The test of a heating or cooling cycle can be terminated before the timer expires by pressing the MODE button and changing the system mode to OFF Installer test for cooling is the same as described for heating above COOL ON will be displayed during cooling in Installer Test Mode In a heat pump application when the mode is set to em heat the auxiliary heat will turn on for 3 minutes The clock display will count down from 180 to 0 during this test 38 TO TEST FAN Fan button switches FAN icon between AUTO and On While On is displayed G output will be energized turning fan on On some fan coils fan continues to operate for 90 sec after G signal is removed Final Settings Be sure to press DONE to exit installer setup mode If the system is to be left in operation after installation is complete use MODE button to select between HEAT COOL or AUTO to provide desired operation of heating cooling or auto On the programmable models the default setpoints and programmed schedule conform to the Energy Star requirements of the U S Department of Energy for both heating and cooling These provide energy saving temperature settings Refer to Table 1 Table 1 Energy Star Default Schedule SCHEDULE HEAT COOL Wake 6 00 AM 68 F 20 C 78 F 26 C Day 8 00 AM 60 F
24. directly to the equipment This will provide a closed contact for the specified number of minutes per hour See Option 19 If timed control of the system blower is required the dry contact can be used for this function The G terminal can be connected to one of the dry contact terminals with the other terminal being connected to Rc and or Rh for timed control of the fan Note that this is not the same as programmable fan Option 30 See Wiring Diagrams for more information 44 Relays This thermostat uses latching relays When the thermostat loses power the relays will remain in their last position until power is restored and all relays are reset to their correct position Out of the box the outputs may appear to be On when the thermostat is not powered This is normal Output states should only be checked when the thermostat is powered Temperature Offset After Power Cycle To compensate for internal heat build up from the electronics in the thermostat the thermostat will add an offset to the actual temperature that it measures If the thermostat power is cycled quickly one can witness an immediate increase in the actual temperature displayed due to this added offset The thermostat display will return to the actual room temperature after several minutes of operation TROUBLESHOOTING If the display module doesn t power up after power is applied check the Rc Rh and C terminals for 24VAC If 24VAC is present check the voltage betwe
25. e Thermostats Time All Days Period 1 Period 2 Period 3 Heat Cool Time Heat Cool Time Heat Cool Period 4 Time Heat Cool Weekdays Weekend 58 E Configuration Options Option 01 Option 02 Option 03 Option 04 Option 05 Option 06 Option 07 Option 08 Option 10 Option 11 Option 12 Option 13 Option 15 Option 16 Option 17 Option 18 Option 19 Option 20 Equipment Type Clean Filter Timer Adjustment Fahrenheit Centigrade Selection Fan G on with W W1 Selection Room Air Temperature Sensing Cooling Lockout Below 55 F Selection only available if outdoor air sensor is present Zoning Auxiliary Heat Lockout Temperature Setting only available when heat pump is used and when outdoor air temperature sensor is present Reversing Valve Adjustable Setpoint Deadband Smart Recovery programmable models only Room Air Temperature Offset Adjustment Enable Auto Mode Cycles Per Hour Time Between Stages Backlight Configuration Dry Contact programmable models only Outdoor Air Temperature Offset Adjustment 59 E Configuration Options cont Option 21 Keypad Lockout Option 24 Programmable Non Programmable programmable models only Option 25 Number of Programmable Periods Per Day programmable models only Option 26 Minimum Cooling Setpoint Option 27 Maximum Heating Setpoint Option 28 UV Light Reminder Option 29 Humidifier Pad Reminder Option 30 Programmable Fan programmable
26. en Vg and V This voltage will be approximately 12 20VDC If voltage is present check the polarity to make sure it is wired correctly The display will not power up if polarity is reversed If dashes appear for Option 01 in config and during reboot the problem could be the red pigtail being wired to Rc or Rh and the black pigtail being wired to C If so remove the two wire pigtail and connect to the V and Vg terminals Error Codes 7 If AC HP Control cannot properly read room temperature display will indicate and all outputs except fan if on will turn off In the case where the installer has selected to average the local sensor and the remote room sensor the AC HP display will alternate between for the failed sensor and the 45 temperature sensed by the working sensor every 10 seconds The control will operate from the temperature sensed by the working sensor E1 If the Display Module and the Equipment Control Module cannot communicate via two wire connection an E1 will be displayed E2 There is no E2 error message E3 If AC HP Control cannot properly read outdoor temperature and it is needed for proper operation display will indicate in the outdoor temperature location E4 If AC HP Control s internal memory fails E4 will be displayed Replace AC HP Control Table 3 can be used as a troubleshooting tool for determining which outputs will be active for a particular
27. er a high heat latch it will finish the heating cycle on high stage On The Y1 and Y Y2 outputs are simultaneously energized to satisfy all heating demands Default is OF off Option 24 Programmable Non Programmable This selection allows the installer to configure the thermostat as either programmable or non programmable Selections are P nP Default is P programmable models only Option 25 Number of Programmable Periods This selection allows the installer to configure the thermostat for two or four periods per day Two periods is a common commercial application and four periods is more common for residential This selection is not available if Option 24 has been set to nP to configure the thermostat for non programmable operation 2 Periods DAY and SLEEP are available 4 Periods WAKE DAY EVE and SLEEP are available Default is 4 Option 26 Minimum Cooling Setpoint This selection allows the installer to configure the minimum cooling setpoint that the user is allowed to set The range is based on the value of the adjustable deadband Option 11 such that the minimum of the range is 50 F 10 C plus the adjustable deadband and the maximum is 90 F 32 C Default is 52 F 11 C based on the adjustable deadband default 2 33 Option 27 Maximum Heating Setpoint This selection allows the installer to configure the maximum heating setpoint The range is based on the adjustable deadband value
28. f the operating parameters will be changed When the keypad lock selection is turned on the padlock icon will be displayed To unlock the keypad press and hold the UP DOWN buttons simultaneously for five seconds When the keypad is unlocked the padlock icon will turn off The keypad will remain unlocked for two minutes after the last button press After two minutes with no button presses the keypad will lock again The keypad will not lock in the software configuration mode or in the installer test mode Default is OF off Option 21 Keypad Lockout non programmable models only This selection allows the installer to limit access to the keypad Selections are OF off 1 2 OF off The user has full access to the keypad 1 The user has access to change the setpoints 2 The entire keypad is locked When a button is pressed the backlight will turn on but none of the operating parameters will be changed When the keypad lock selection is turned on the padlock icon will be displayed To unlock the keypad press and hold the UP DOWN buttons simultaneously for five seconds When the keypad is unlocked the padlock icon will turn off The keypad will remain unlocked for two minutes after the last button press After two minutes with no button presses the keypad will lock again The keypad will not lock in the software configuration mode or in the installer test mode Default is OF off 31 Option 22 High Cool Latch
29. g could result in personal injury or death Before installing AC HP Control turn off all power to equipment There may be more than 1 power disconnect A CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation Improper wiring or installation may damage AC HP Control Check to make sure wiring is correct before proceeding with installation or turning on power 1 Turn off all power to equipment 2 If an existing thermostat is being replaced a Remove existing thermostat from wall b Disconnect wires from existing thermostat 1 at a time c As each wire is disconnected record wire color and terminal marking d Discard or recycle old thermostat A CAUTION ENVIRONMENTAL HAZARD Failure to follow this caution may result in environmental damage Mercury is a hazardous waste Federal regulations require that Mercury be disposed of properly Two Piece Installation The following steps should be followed for the installation of the two piece configuration NOTE The 2 wire pigtail is not intended to support the weight of the User Interface Do not hang the User Interface from the equipment Control Module screw terminals 1 Remove mounting plate from back of Display Module by pressing the two tabs on the bottom edge and pulling away See Fig 4 and 5 A07225 Fig 4 Press Tabs to Remove Backplate 10 A07226 Fig 5 Take Apart 2 Route wire
30. installer to choose how much differential exists between the heating and cooling setpoints Allowable selections are 1 6 Default is 2 Option 12 Smart Recovery Smart Recovery OF off means setpoints change precisely at setback recovery time Thirty 60 or 90 selects the number of minutes recovery starts before programmed recovery time Recovery takes place smoothly during the selected recovery time ending at the recovery time and temperature which is programmed Not available with non programmable thermostats or when thermostat is configured as non programmable Default is 90 Option 13 Room Air Temperature Offset Adjust The number of degrees to be added to the displayed temperature to calibrate or deliberately miscalibrate the measured room temperature 5 to 5 Default is 0 Option 15 Enable Auto Mode This selection is not available if the thermostat is configured as Heat Only or Cool Only in Option 1 This allows the homeowner to select auto changeover mode in addition to heat and cool This allows the thermostat to automatically change between heating mode and cooling mode when sufficient demand for heating or cooling exists 28 On Auto mode is available OF Auto mode is not available Default is On Option 16 Maximum Cycles Per Hour This selection limits the number of cycles per hour that the thermostat allows the system to operate Selections are 2 4 6 2 The heating and cooling
31. n the living space The remote room sensor may be used as a stand alone or average with local sensor Two Piece Thermostat Configuration The Preferred Series AC HP Control can be installed in one of two configurations The control may be installed as a single piece thermostat or it may be split into two pieces and mounted in separate locations As a single piece unit all required wiring must be brought to the Equipment Control Module for connection to the terminal strip In two piece configuration the Display Module can be mounted in the living space while the Equipment Control Module may be mounted near the indoor furnace or fan coil Connection from the display to the Equipment Control Module requires only two wires All other control wires are connected to the Equipment Control Module from the HVAC equipment This configuration results in a slimmer display and locates the Equipment Control Module containing the switching relays away from the main living space where relay clicking will not be heard The model numbers on the Display Module and the Equipment Control Module ECM must match or unpredictable results may occur Two wire pigtail replacement part number is TX 2WR 05 Wiring Wire length should be no more than 250 ft 76m Use 22 AWG for normal wiring applications Continuous wire lengths over 100 ft 30 5m should use 20 AWG or larger INSTALLATION Carton contains the following components See Fig 2 for programmable m
32. ngle piece configuration 1 Remove cover from Equipment Control Module by pressing the two tabs on the bottom edge and pulling away Route wires through large hole in Equipment Control Module Level Equipment Control Module against wall for aesthetic value only Equipment Control Module need not be leveled for proper operation and mark wall through 4 mounting holes To avoid unintended bending of wall plate plastic use all 4 screws and anchors 2 Drill four 3 16 in mounting holes in wall where marked Thermostat may be mounted to a standard junction box if desired Hole pattern on Equipment Control Module matches junction box mounting holes 3 Secure rear plastic Equipment Control Module to wall with 4 screws and anchors provided To avoid unintended bending of wall plate plastic use all 4 screws and anchors Make sure all wires extend through hole in Equipment Control Module 4 Adjust length and routing of each wire to reach proper connector block and terminal on Equipment Control Module with 1 4 in 6mm extra length See Fig 14 19 A07219 Fig 14 Equipment Control Module Match and connect equipment wires to proper terminals of each connector block Push any excess wire into wall and against Equipment Control Module Seal hole in wall to prevent air leaks Leaks can affect operation and cause incorrect temperature and or humidity measurement Remove 2 wire pigtail from thermostat mounting base and
33. odels or Fig 3 for non programmable models A07756 Fig 2 T6 PAC T6 PHP Carton Contents 1 Display Module 2 Stand off for Equipment Control Module 3 Screws and pig tail 4 Equipment Control Module A07757 Fig 3 T6 NAC T6 NHP Carton Contents 1 Display Module 2 Stand off for Equipment Control Module 3 Screws and pig tail 4 Equipment Control Module AC HP Control Location AC HP Control should be mounted e Approximately 5 ft 1 5m from floor e Close to or in a frequently used room preferably on an inside parti tioning wall e Ona section of wall without pipes or duct work AC HP Control should NOT be mounted e Close to a window on an outside wall or next to a door leading to the outside e Exposed to direct light or heat from a lamp sun fireplace or other temperature radiating objects which could cause a false reading e Close to or in direct airflow from supply registers and return air regis ters e In areas with poor air circulation such as behind a door or in an al cove Installer should determine whether control will be installed as single piece or two piece In single piece configuration as many as 14 wires may need to run to wall mounting location for connection to the control In two piece configuration the Display Module and Equipment Control Module are connected by two wires Install AC HP Control A WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warnin
34. outputs will be energized no more than 2 times per hour When an output is energized it will not be energized again for 30 minutes 4 The heating and cooling outputs will be energized no more than 4 times per hour When an output is energized it will not be energized again for 15 minutes 6 The heating and cooling outputs will be energized no more than 6 times per hour When an output is energized it will not be energized again for 10 minutes Default is 4 Option 17 Time Between Equipment Stages This selection is only available for heat pump systems This determines the minimum number of minutes of equipment operation on the highest compressor stage before allowing the transition to auxiliary heat Available selections are 10 15 20 and 25 The time between stages of any individual piece of equipment such as low speed and high speed compressor or fan coil stages will be fixed at 10 minutes Default is 15 Option 18 Backlight Configuration When OF off the backlight will be lit for 10 seconds after a button is pressed After 10 seconds of no button presses the backlight turns off When On the backlight will normally be on and dim in appearance The backlight brightness 29 becomes brighter when a button is pressed After 10 seconds of no button presses the backlight will return to the dimmer level until another button press occurs The range of brightness is 1 through 5 with 5 being full brightness Default is 3 Op
35. pment Control Module on Equipment 11 Route wires through rear of Equipment Control Module using either a clearance hole or supplied standoff See Fig 12 16 A07227 Fig 12 Standoff NOTE Standoffs are provided as an aid when installing Equipment Control Module on inside equipment or a solid wall 12 Match and connect equipment wires to proper terminals of each connector block being careful not to over tighten the screws Correct polarity must be observed when connecting the two wires from the Equipment Control Module to the thermostat mounting base If wires are connected incorrect ly the Display Module will not operate See Fig 7 8 and 9 13 Snap cover over top of Equipment Control Module See Fig 13 17 A07218 Fig 13 Cover on Equipment Control Module 14 Turn on power to equipment On power up all display segments will light for 5 sec For the next 5 sec a 2 digit code appears on large display which identifies AC HP Control configuration Refer to Option 33 a AC 1 stage air conditioner AC with furnace or fan coil b HP 1 stage heat pump HP only with fan coil c H heating only system furnace only or fan coil with electric heat only d C cooling only system AC with fan coil e H2 2 stage heat pump with fan coil f A2 2 stage air conditioner with fan coil or furnace 18 Single Piece Installation The following steps should be followed for the installation of the si
36. red to operate AC equipment 1 Thermostat controls W1 output only and furnace controls the turn on and turn off of higher stages of heat 35 2 Thermostat will control the W1 and O W2 B outputs Default is 1 Option 33 Single or Two Piece Installation This configuration allows the thermostat to compensate for the amount of heat generated by the thermostat electronics to allow more accurate sensing of the temperature sensor The amount of heat compensation will be different between single installation and two piece installation Range 1P or 2P 1P The installation is single piece 2P The installation is two separate pieces Default is 2P Option 41 Variable Speed Blower This selection allows the installer to select between a single speed or variable motor Off The system has a single speed PSC blower On The system has a variable speed blower Factory default is OF Off Option 44 Super Comfort Heat This option is only available on heat pump units HP HP H2 when Option 41 Variable Speed Blower is set to On and the system has a valid OAT sensor OF Off Comfort Heat is off On Comfort Heat feature is on If the outdoor air temperature is between 12 to 40 F 11 to 4 C and the compressor is running in heating then the fan output is turned off This will signal the variable speed blower to reduce the air speed The fan output is turned 36 off even if the user has the fan
37. s have been restored the thermostat will act as if power was cycled and return to normal operation If the DOWN key is released early the number will return to 10 and the reset will not occur 37 SYSTEM START UP AND CHECKOUT The AC HP Control is designed with a built in installer test capability It allows easy operation of equipment without delays or setpoint adjustments to force heating or cooling To enable installer test mode press and hold the fan button for 15 seconds After 10 seconds the thermostat will enter Configuration Mode Continuing to hold the Fan button through 15 seconds will cause the thermostat to enter Installer Test Mode Pressing the Mode button will change the system operating mode to test the heating and cooling equipment Auto Mode is not available during Installer Test Mode If no buttons are pressed for 15 minutes the installer test mode will be terminated Pressing DONE at any time will exit installer test mode Heat The first stage of heating will be energized for three minutes then the first and second stages if a second stage exists will turn on for an additional three minutes During the first stage of heating the HEAT ON icon will be displayed The auxiliary heat on icon will be displayed if the second stage is electric heat HP unit type For heat pump installation only 1 stage of auxiliary heat is available Any staging of auxiliary heat must be managed by the furnace or fan coil At the en
38. s only Furnace Heat Staging Single or Two Piece Installation Variable Speed Blower Super Comfort Heat Reset to Factory Defaults TO ENTER CONFIGURATION MODE Press and hold FAN button for approximately 10 sec The Display Module is now in configuration mode It will automatically exit this mode if no button is pressed for 3 minutes Pressing either FAN or DONE button will exit configuration mode immediately 23 WHILE IN CONFIGURATION MODE The option number is displayed in the heat setpoint location and the configuration setting is displayed in the cool setpoint location On the T6 PAC PHP programmable models a box will surround the option number The mode button is used to move the box between the two displayed values The soft keys below the listed values may also be used to move the box between selected values The value inside the box is changed by using the UP DOWN buttons On the To NAC NHP non programmable models one of the values will be flashing The mode button is used to change which value is flashing or the Home and Sleep buttons may also be used to select which value to flash The value that is flashing is changed by using the UP Down buttons All changes made are saved at the time of selection and will be saved in the event of the 3 minute time out or when installer exits from configuration menu Configuration Options Selection Option 01 Equipment Type HP model Range HP AC H C H2 A2 AC model R
39. s through large hole in mounting base Level mounting base against wall for aesthetic value only Display Module need not be lev eled for proper operation and mark wall through 4 mounting holes To avoid unintended bending of wall plate plastic use all 4 screws and an chors See Fig 6 11 A07165 Fig 6 Backplate Mounting Drill two 3 16 in mounting holes in wall where marked Thermostat may be mounted to a standard junction box if desired Hole pattern on ther mostat mounting base matches junction box mounting holes Secure rear plastic mounting base to wall with 4 screws and anchors pro vided To avoid unintended bending of wall plate plastic use all 4 screws and anchors Make sure all wires extend through hole in mounting base Adjust length and routing of each wire to reach proper connector block and terminal on mounting base with 1 4 in 6mm extra wire Match and connect equipment wires to proper terminals of each connector block being careful not to over tighten the screws Correct polarity must be observed when connecting the two wires from the Equipment Control Module to the thermostat mounting base If wires are connected incorrect ly the Display Module will not operate See Fig 7 8 and 9 12 Control Module Wiring Guide OAT OAT RRS RRS return SRTN HUM dry DI contact D2 Y used for single stage cooling connect V to user interface Vg
40. selection set to continuous fan The fan output will be turned back on in this temperature range if the maximum capacity of auxiliary heat is on due to system demand auxiliary heat on in response to a defrost signal shouldn t cause the fan to turn back on If the outdoor air temperature is below 12 F 11 C and there is sufficient demand for the equipment to be on then the fan output is turned back on and the W W1 output is energized In a two speed unit the Y Y2 output should be energized in addition to the W W1 output NOTE All temperature boundaries have a 2 hysteresis Factory default is OF Off Option 99 Reset to Factory Defaults Use this capability to reset the stat to out of the box conditions BEWARE All configuration settings program settings clock and calendar which have been manually entered will be lost When this option is selected the configuration number 99 will appear on the left and 10 will appear on the right To perform the reset first use the MODE key to move the box from the 99 to the 10 programmable model or to flash the 10 non programmable model Then press and hold the DOWN key The 10 will start counting down toward zero If the DOWN key is kept pressed until the count reaches zero the reset will be performed When the value reaches zero the heat setpoint shall display The cool setpoint shall display and the room air temperature shall display Fd When the factory default
41. tings the soft keys are used to set the days period times heating setpoints and cooling setpoints The UP DOWN buttons are used to change the setting with the box around it ALL PROGRAM PERIODS WAKE DAY EVE SLEEP MUST OCCUR WITHIN THE SAME 24 HOUR PERIOD When changing Vacation settings the soft keys are used to choose the selection to be adjusted and the UP DOWN buttons are used to change the setting 40 Vacation programmable models only A vacation selection is available specifically for times where the home will not be occupied for an extended period Vacation mode has an automatic hold meaning that setpoints are not affected by the programmed schedule Vacation mode is active for a specified period of time While in vacation mode the system provides temperature protection for the home in the selected mode but not comfort When vacation mode is active an arrow will be displayed beside VACATION in the upper left corner of the display Vacation Setpoints A special set of temperature setpoints exist which are active in vacation mode They are adjustable by the homeowner are exclusively for vacation mode and are remembered from one vacation selection to the next See Table 2 for default values Table 2 Vacation Setpoints Default Values MODE AUTO Fan Auto Heat Setpoint 55 F 13 C Cool Setpoint 85 F 29 C OPERATIONAL INFORMATION Timers Five Minute Compressor Timeguard This timer
42. tion 19 Dry Contact Configuration programmable models only There are 2 available selections OF and 1 OF The dry contact is always de energized 1 The dry contact will be energized for the specified number of minutes per hour This selection is programmable by period When this selection is changed from OF to 1 the period icons are shown and the minute segments of the clock display are shown The triangle icon next to the WAKE period will be on and a value between 0 and 60 will be shown in the minutes display See Operational Information and Wiring Diagrams for further explanation of dry contact configuration and use To change the period or minutes press the soft key below the period or minutes and then use the UP DOWN buttons to change to the desired value Default is OF off Option 20 Outdoor Air Temperature Offset Adjustment This selection allows the calibration or deliberate miscalibration of the outdoor air temperature sensor reading The selection ranges from 5 to 5 Default is 0 Option 21 Keypad Lockout programmable models only This selection allows the installer to limit access to the keypad Selections are OF off 1 2 3 OF off The user has full access to the keypad 30 1 The user has access to modify setpoints time of day 2 The user has access to change the setpoints only 3 The entire keypad is locked When a button is pressed the backlight will turn on but none o
43. tton the override selection will remain in effect until the next programmed period time Default is OF off Option 31 Daylight Savings Time Configuration programmable models only This selection allows the installer to set the thermostat to automatically change by one hour on the specified day month and week specified OF off Daylight Savings Time Function disabled 1 2 On The first time the UP DOWN button is pressed the value of this selection changes from OF off to 1 When 1 is displayed the days of the week and clock digits will be turned on The installer will set the start date Spring for Daylight Savings Time by setting the day of the week by selecting the appropriate triangle icon next to the days of the week the month of the year will be set in the clock hours location range 1 12 and the week of the month will be set in the clock minutes location The week of the month selections will be F 2 3 4 and L for First 2nd 3rd 4th and Last So for the first Sunday in April the display would show SUN 4 F When 2 is displayed the installer will then choose the end date for daylight savings time Fall To activate the function the installer changes the 2 by pressing the up button and On is displayed The setting shall be left On to enable the Daylight Savings Time function Default is OF off Option 32 Furnace Heat Staging Control available only when the HP thermostat is configu
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