ECOMM Series WT770 Installer Manual
Contents
1. Entering the Installer Menu To enter the Installer menu press and hold the O RIDE button for 15 seconds After 15 seconds the LCD will show 88 15 eight eight one five Adjust this value to 88 21 eight eight two one the factory default PIN or your previously selected value by using the up O or down O button Tap the O RIDE button to enter the menu If you have entered the correct PIN you will be given the first menu option if you have entered an incorrect PIN you will be exited from this menu Default Installer Values are shown in the examples in the following pages 23 Page WT770 Advanced Installer Manual V 3 PN 21 Keyboard Lock PIN This is the required PIN for future entry into the Installer menu Range 00 to 99 in 01 steps To prevent accidental PIN changes you must press and hold the or buttons for longer than 1 second to change the PIN value Caution if you change this value and forget your new PIN you may need to return the WT770 to place of purchase for unlocking there will be a fee for this service LC 0 Keyboard Lock level Programmable Mode SW6 ON LC 00 Key board Lock OFF LC 01 All buttons are locked except the Temperature buttons LC 02 All buttons are locked except the O Ride button amp Temp buttons LC 03 Fan and Program buttons are locked LC 04 Fan Program and Override buttons are2. Dead Band where the heating and cooling differential is controlled by a installer set value This is the simplest method of temperature control Further you are able to adjust how quickly the WT770 thermostat responds to room temperature changes by adjusting the RS XX value in the installer menu The lower this setting the faster the thermostat will respond to room temperature fluctuations the larger this number the slower the thermostat will respond to changes in room temperature Single Set Point mode Two Set Point mode Cool Stage 2 On ee eee Cool Stage 2 On Stage Delay Cool Stage 1 On 7 S 4 4 Cool Stage 1 On pan t Cool OFF y Cool Set point Cool OFF Set Point Dead Band Heat OFF Heat Set point Heat OFF an t Heat Stage 1 On pele L N Heat Stage 1 On Stage Delay Heat Stage 2 On _ Heat Stage 2 On 31 Page WT770 Advanced Installer Manual V 3 Commissioning As with any thermostat commissioning ensures that the thermostat and the equipment connected to it are operating correctly and as expected Although the WT770 is a multifunctional thermostat commissioning is quite a simple process Follow the steps detailed below if you encounter a problem Commissioning ICON When the thermostat is fitted to the base plate and when 24VAC power is first applied the LCD should briefly show all available segments a LCD function test then display the software version number
3. AF 1 Room temperature will not be permitted to fall below 5c 41F oH Off Occupied Mode Heat Set see page 11 for more information Only operates if TT OC This is the heating temperature that will be used in Occupied mode and will temporarily replace the user heat set point while the TT terminals are shorted together Adjustable range 0 35c 32 95f oC OFf Occupied Mode Cool Set see page 12 for more information Only operates if TT OC This is the cooling temperature that will be used in Occupied mode and will temporarily replace the user cool set point while the TT terminals are shorted together Adjustable range 5 37c 41 98f SP 2 Stage 1 Span See page 37 for an overview of this control function Hysteresis for Stage 1 difference between heating and cooling turning on and off Sp 1 0 5c SP 2 1 0c Sp 3 1 5c Sd 2 Stage 2 Span See page 31 for an overview of this control function Hysteresis for Stage 2 difference between heating and cooling turning on and off Sd 1 0 5c Sd 2 1 0c Sd 3 1 5c DT 30 Upstage delay time Time in minutes before next stage of heating or cooling is to be called Delay only operates if stage trip temperature has not yet been reached Adjustable between 10 90 Minutes in 5 minute steps OS 0 Optimized Start stop Adaptive Recovery OS 0 Optimized start stop function Off OS 1 Optimized start stop function running See page 39 for more inf
4. C systems it is preferred that under no circumstances should the compressor start within 4 minutes of it switching off Note when power is first applied to the WT770 it assumes that the compressor has just stopped and applies this anti cycle delay time before starting Switch 6 Thermostat Operation To suit the varying requirements of the user the WT770 can be set asa programmable thermostat using the time clock to automatically control the building temperature to a programmed temperature profile or to the very simple to operate manual mode where the user turns the thermostat on or off and adjusts the temperature set point manually 7 Page WT770 Advanced Installer Manual V 3 Switch 7 Minimum Run Time To conserve energy and protect the A C system it is recommended to limit the number of times the heating and or cooling system can run in 1 hour This switch sets the minimum heating and cooling equipment to a minimum run time of 2 or 6 minutes Once the heating or cooling has started it must run for this minimum set time The LCD will flash the word Heating or Cooling whenever this timer is in effect Switch 8 Thermostat Control Logic This switch also has two functions based on the position of switch 6 When the WT770 is set as a programmable thermostat switch 8 determines whether a commercial program or residential program is selected When switch 6 has the WT770 used as anon programmable thermostat thi
5. Mode Comp stops with Aux heat H3 AL SMT will permit both Aux heat amp E Heating mode both use W2 relay tt RS TT terminal Function see page 10 for more detail on this function tt OA Connect the outside air temperature sensor to the TT terminals to display the outside Air Temperature Required for all outside air control functions to operate tt RS Connect the remote room temperature sensor to the TT terminals to measure the temperature at a remote location away from the WT770 Note This completely disables the temperature sensor fitted to the WT770 tt AV The TT terminals will average the temperature measured by the WT770 internal sensor and remote room temperature sensor tt OF Aclosed contact on the TT terminals will switch the WT770 On or OFF More detail on this function provided on page 12 of this manual tt OC Aclosed contact on the TT terminals will switch the WT770 to Occupied Mode where the oC amp oH temperatures will replace the user set temperatures See page 12 of this manual for more detail on this function tt DA The WT770 will broadcast the measured temperature from the remote temperature sensor via ModBus It will not display this value on the LCD nor is it used for any control option This mode is intended to provide system feedback to the ModBus master only 27 Page WT770 Advanced Installer Manual V 3 AF 0 Anti Freeze Function AF 0 Antifreeze function off
6. achieve the desired temperature at the selected time If the user typically returns home at 5 00pm at the end of the work day setting program 3 if used in residential programmable mode to 5 00pm the WT770 will calculate the most energy efficient time based on the set and room temperatures as well as a history of temperature change to bring on the equipment prior to 5 00 pm to meet the desired set temperature by 5 00 pm For example when heating is required the heating may start at 4 32 pm so that the set temperature is reached at 5 00 pm Adaptive recovery may also prevent the WT770 from running for a few moments just prior to a program change occurs RECO is shown in the LCD when ever Adaptive Recovery is being used 37 Page WT770 Advanced Installer Manual V 3 Specifications Input Voltage Relay rating Operating Temperature Operating RH Storage Temperature Size Display Size Temperature Sensor s Accuracy Stage Delays Timed upstage Delay Anti cycle Delay Maximum hourly cycles Display resolution 24VAC 50 60 Hz 15 24VAC 1Amp maximum per relay 0 50C 32 to 122F 0 95 non condensing 0 65C 32 to 150F 113 x 103 x 23mm 74 x 55mm 10K NTC type 3 0 3deg C 25 C 77F Minimum temperature change over time method 5 90 minutes Off to 4 minutes Unlimited 30 10 or 6 Installer set 0 5 deg C 1F Control Range Off to 38c 100F Outside Air temp displa
7. before showing the time and operating mode etc The WT770 is fitted with a number of safety and energy saving time delays If desired these can be disabled for commissioning purposes by entering the installer mode and setting the CD 00 value to read CD 01 After exiting the installer menu you will note a Wrench icon flashing on the LCD to remind you that commissioning mode is Active After commissioning has been completed it is important to disable commissioning mode by entering the installer menu once again and setting the CD 01 value back to CD 00 Note when in commissioning mode ALL time delays are either OFF or reduced to a extremely low value it is therefore normal to potentially call for 3rd stage heating almost instantly 0 5deg below the heating set point If you choose not to use commissioning mode you may see various words and Icons flashing in the LCD whenever a time period is in use For example the word HEAT may flash to indicate heating is required but being held off by the 4 minute anti cycle timer Or the word HEATING may be flashing to indicate set point has been achieved however heating is being held ON by the minimum run timer The golden rule with the WT770 is anything that flashes is a time period overriding what would normally be expected to occur either a function is being held on or off momentarily Please be patient 32 Page WT770 Advanced Installer Manual V 3 Test fan operation With the ther
8. locked LC 05 All buttons locked except O Ride LC 06 All Buttons locked Manual Mode SW6 Off LC 00 Key board Lock OFF LC 01 All buttons are locked except the Mode button LC 02 All buttons are locked except the Mode and temperature button LC 03 Fan amp O ride buttons are locked Mode button can only select Auto Heat amp Cool and off LC 04 O Ride Button is locked Mode button can only select Auto Heat amp Cool and off Note the temp I buttons range can be limited in the HL amp CL menu 24 Page WT770 Advanced Installer Manual V 3 HL 35 95F Heating Limit or High Limit The highest Heating value permitted to be set by the user Adjustable between 0 35c 32 95F CL 5 41F Cooling Limit or Low Limit The lowest Cooling value permitted to be set by the user Adjustable between 5 37c 41 98F CF C Temperature display Format Deg C or deg F display type effects all user and installer menu items C1 0 0 Fitted Sensor Calibration Calibration Offset for the internal sensor Adjustable range 4 5 deg C 9 F in 1 0 Deg steps tC 12 Time Clock tC 12 12 Hour Time Clock tC 24 24 Hour Time Clock tC 0 No time clock shown Manual mode only SW6 off tD 0 Temperature Display TD 00 WT770 will display both the Room amp Set Temperature TD 01 WT770 will display set temperature only AH 2 After Hours Override Timer S
9. therefore essential that the WT770 be installed in a location that is typical of the ambient room temperature Do not install the thermostat in a draft near a floor behind doors or on a non insulated external wall Also avoid placing the thermostat in areas where the air movement is limited affected by direct sunlight or other areas not typical of the temperature of the room Further when mounting the WT770 be aware that drafts may travel down the inside of cavity walls especially if mounted on external walls and enter the back of the thermostat or sensor enclosure through the cable entry holes in the wall It is important to fully seal these holes to prevent any drafts affecting the internally mounted temperature sensor It is recommended to mount the WT770 or remote sensors between 1 5 amp 1 7 meters from the floor where possible Move the control wires through the large opening in the thermostat Sub Base then place the thermostat base on the wall and using appropriate screws firmly attach the thermostat base to the wall Block any holes where cables enter the back of the thermostat to prevent drafts entering through these holes affecting the sensor Separating the WT770 Body from the Sub Base prior to Mounting Once removed from the box insert a Flathead screwdriver into the slot in the center of the WT770 Sub Base Body Then simply twist the screwdriver and the Body will separate from the Base allowing the two pie
10. 770 Advanced Installer Manual V 3 1 heat with add on cool Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 14 Page WT770 Advanced Installer Manual V 3 2 stage gas heat 1 stage add on cool w2 Y2 Rly zav asc 8 lt ia L bes Trh See TT Terminals Options List Equipment Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 On Two Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 15 Page WT770 Advanced Installer Manual V 3 1 stage reverse cycle 1 speed fan See TT Terminals Options List Switch Settings Sw1 Off 1 speed fan Sw2 On HP System Sw3 Off One Stage Sw4 On Heat B Off Cool O Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Note Set SW4 to suit the system 16 Page WT770 Advanced Installer Manual V 3 1 stage reverse cycle 3 speed fan mw il Fan Med ued va Fan Med vate Comp i i i Equipment Switch Settings Sw1 Off 1 speed fan Sw2 On HP System Sw3 Off One Stage Sw4 On Heat B Off Cool O Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Note Set SW4 to su
11. Bus baud rate is 19 200 Baud 29 Page WT770 Advanced Installer Manual V 3 SS 0 Start Stop Mode Override Typically used by ModBus Master SS 0 User Start Stop program in use SS 1 Thermostat held in Start program typically via call from ModBus master SS 2 Thermostat held in Stop program typically via call from ModBus master RS 40 Thermostat sensor response time to room temperature changes Adjustable from RS 10 very fast to RS 90 very slow Cd 01 Commissioning Mode Cd 0 Commissioning mode is OFF Cd 1 All time delays are off or reduced to a very small value tS 0 Factory test mode TS 0 Factory test Mode OFF TS 1 Display configuration code TS 2 Step cycle all relays in sequence 1 2 3 4 5 etc TS 3 Reset software to factory default Press Fan button to initiate 30 Page WT770 Advanced Installer Manual V 3 Control logic This simple diagram below provides a general insight into the control logic of the WT770 thermostat It attempts to describe the action of the DB XX theSP XX and SD XX advanced installer control capabilities in both two set point and single set point mode By adjusting these three values to suit the needs of the user or equipment extremely tight temperature control can be achieved or a more energy efficient temperature control profile can be set In single set point mode sw8 off the individual heating and cooling set points are replaced by a
12. ECOMM Series WT770 Installer Manual This document is not typically left with the user as it contains information on setting values which if not correctly set may damage the heating cooling or air conditioning system or seriously affect its performance or energy consumption Great effort has been taken to making the WT770 thermostat system intuitive reliable and easy to install Using a common sense approach to the installation will ensure this product is installed easily and to the customer s satisfaction Please read and understand this instruction manual so that installation testing and commissioning process is undertaken in an efficient and effective manner This manual is to be used in conjunction with the supplied User Manual Great care has been taken in the preparation of this manual KCRS takes no responsibility for errors or omissions contained in this document It is the responsibility of the user to ensure this thermostat or the equipment connected to it is operating to their respective specifications and in a safe manner Due to ongoing product improvement KCRS reserves the right to change the specifications of the WT770 thermostat or its components without notice 1 Page WT770 Advanced Installer Manual V 3 Table of Contents Installation Mounting the WT770 to the Wall Setting the Hardware Dip Switches TT Terminal Functions Outside Air Sensor Wiring Remote Air Temperature Sensor Wiring Averaging Temperature Sensors
13. Remote ON OFF Function Using the Occupancy Mode Supply Air Temperature Monitoring Typical Drawings Attaching the Thermostat Advanced Installer Settings Commissioning Using Remote Temperature Sensors Advanced Functions Specifications Sensor Reference Table Troubleshooting 2 Page WT770 Advanced Page 3 Page 4 Page 6 Page 9 Page 8 Page 8 Page 10 Page 10 Page 10 Page 11 Page 12 Page 22 Page 23 Page 32 Page 34 Page 36 Page 38 Page 38 Page 39 Installer Manual V 3 Installation As with any air conditioning project undertaken careful installation is the key to a successful outcome The steps required to install the WT770 thermostat are 1 2 Read and understand this manual and the User Manual Mount the WT770 Sub Base in a suitable location Set the 8 DIP switches to match the need of the project user Wire the optional remote temperature sensor s or switches if required Power up the air conditioning system Set the installer software options if required Program and set up the WT770 thermostat Consult User Manual Test the heating cooling and other functions Commissioning For convenience the layout of this manual is in the same order as the steps listed above 3 Page WT770 Advanced Installer Manual V 3 Mounting the WT770 Thermostat The WT770 can only be as accurate as the onboard temperature sensor or its optional remote temperature sensor s permit It is
14. ammable mode SW6 on SW8 off the afterhours run timer can be toggled on or off as required with a momentary press button on the remote sensor See figure 17 As the WT770 Auto detects sensors connected to the TT terminals temperature sensors can also be switched on and off as required by placing a switch in the sensor wiring to open circuit the sensor loop See figure 16 34 Page WT770 Advanced Installer Manual V 3 In line Override sealant Figure 16 In line On Off gt Switch Figure 17 35 Page WT770 Advanced Installer Manual V 3 Advanced Functions Factory Test Mode The WT770 is fitted with a simple factory Test Mode where you can confirm that all relays outputs functions and the current configuration of the thermostat Ts 0 Factory Test Function is OFF Ts 1 Display DIP switch configuration code Ts 2 Relay test mode All relays cycle on then off in an endless loop Ts 3 Factory Software reset Press Fan button to confirm High and Low balance points The WT770 is fitted with both High and Low Balance Point control capability For these functions to operate the Installer setting must be TT OA outside air temperature sensor fitted the outside air sensor must be installed and SW1 must be OFF Single fan speed mode High Balance point Set the installer menu value HB XX When the outside air temperature is above this value second or third stages of heating
15. are held off regardless of the room and set temperature Set this function is designed to prevent the excessive consumption of energy for heating when the outside air temperature is warm Low Balance point SW2 on H3 EH Emergency Heat Mode Set the installer menu value LB XX When the outside air temperature is below this value the WT770 will automatically switch to emergency heat mode when heating is required If the outside temperature is above this LB XX value the emergency heat mode can be selected manually at anytime with the MODE button Setting up the Heat amp Cool Off functions To conserve energy the WT770 can suspend the heating or cooling functions if the outside air temperature is within a prescribed installer set range If the outside air temperature is above the HO XX heating OFF value heating will not be called regardless of the room and set temperature If the outside air temperature is 36 Page WT770 Advanced Installer Manual V 3 below the CO XX value cooling will not be called regardless of the room and set temperature Heat or Cool and the word Locked will flash on the LCD to show that these modes have been restricted Adaptive recovery Only available in programmable mode sw6 on The adaptive recovery function of the WT770 permits the user to program a time that a desired set temperature is required letting the thermostat calculate the most energy efficient time to turn on to
16. by switching temperature sensing locations between the remote temperature sensor and the WT770 temperature sensor when required Simply fit an inline switch in the sensor wiring or order KCRS part number A770RS 01 sensor See Figure 2 9 Page WT770 Advanced Installer Manual V 3 Averaging Temperature Sensors Set TT AV in the Advanced Installer Menu The WT770 can average the sensed temperature equally between the remote temperature sensor s and the one fitted to the WT770 if required See figure 1 on the previous page for details on wiring the sensor The WT770 will auto detect this sensor and automatically average the two sensors values to control the room temperature Remote ON OFF Function Set TT OF in the advanced installer menu The WT770 can be connected to an external dry contact When this contact is closed the WT770 will turn OFF See figure 3 When the WT770 has been switched OFF via the TT terminals the word OFF will flash in the LCD to indicate that this has been the shutdown method The WT770 will return to the user settings when this switch is open SMT 770 On OFF Switch T _ i Using the Occupancy Mode Figure 3 Set TT OC in the advanced installer menu The WT770 can alternate between the user preferred set points and an installer pre programmed set point when required Simply wire a remote switch to the WT770 TT terminals see figure 3 When th
17. ces to be fully separated by hand Insert screwdriver only 1 8 of an inch into the 3 8 inch wide slot 4 Page WT770 Advanced Installer Manual V 3 Removing the WC21 FFD Radio for Low Voltage Wire Termination Once you have the Body separated from the base put finger pressure on the two tabs holding the WC21 FFD one at a time and the WC21 FFD can be removed for mounting and low voltage wire termination Reverse the process after terminating the low voltage conductors hou r v he TT TE T TE TE Y 5 Page WT770 Advanced Installer Manual V 3 Setting the Hardware Dip Switches Switch Off On Sw1 Fan Speeds 1 Speed Fan 3 Speed Fan Sw2 Equipment Type Heat Cool Heat Pump O B terminals Sw3 Stages 1 Stage 2 Stages Sw4 Reversing Valve If Sw2 ON Heat Pump Energize in Cool O Energize in Heat B Sw4 Fan Mode If Sw2 OFF Heat Cool Fan Control by Heater HG Fan Control by WT770 HE Sw5 Anti cycle timer Off 4 Minutes Sw6 Operation Manual Thermostat Programmable Thermostat Sw7 Minimum Run 2 Minutes 6 Minutes Sw8 Program Type If Sw6 ON Programmable Commercial Program Residential Program Sw8 Set points If Sw6 OFF Manual Single Set point Two Set points Typical drawings have been provided on page 12 of this manual that will assist with the
18. e switch is open the user settings will control the room temperature When the switch is closed the Installer Oc Occupied Cooling value amp Oh Occupied Heating value settings will be used to control the room temperature 10 Page WT770 Advanced Installer Manual V 3 Supply Air Temperature Monitoring Set TT DA in the advanced installer menu In this mode the WT770 will broadcast this sensor temperature value to ModBus ONLY this value is not used by the WT770 nor is it displayed on the LCD It is expected that this information is used for supervisory functions or equipment control feedback Also as this is an analogue input by monitoring a switched resistor network your supervisory software can decode a number of digital states 11 Page WT770 Advanced Installer Manual V 3 Typical Drawings Heat only system with fan control Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Tip Set Installer menu Fn H 12 Page WT770 Advanced Installer Manual V 3 Cool only system with 1 speed fan Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 N A Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Tip Set Installer menu Fn C 13 Page WT
19. ermostat to the base avoid twisting the case as this may stress the LCD and cause it to crack Avoid running wiring near the internally fitted sensor Take care not to damage or crush the temperature sensor between the two half s of the case when you close the WT770 case Check this sensor location 22 Page WT770 Advanced Installer Manual V 3 Advanced Installer Settings The WT770 is fitted with many advanced functions that can be fine tuned by the installer to specifically match the needs of the project of the user Normally these functions will not need to be altered from the factory default position however there may be times when you wish to alter a setting or control capability so that the WT770 performance will perfectly match a particular application On the next few pages there is detailed explanation of these functions and their range of control While in the advanced installer menu all WT770 equipment control functions will be suspended Normal equipment operation will continue when you have exited this menu after any anti cycle delays or safety delays have terminated Using the Installer Menu To move forward through the Installer menu items tap the O RIDE button To move backwards through the Installer menu items tap the PROG button To adjust a value in the Installer menu tap the 1 or down O buttons To exit the installer menu tap the Mode button the Fan button or wait 60 seconds
20. flashing in the LCD Heating or cooling has not started This is not a fault Heating or cooling will start shortly Anti cycle delay in progress This can be disabled if required for commissioning The Fan runs on for some time after the heating or cooling stops even when turn the WT770 OFF This is not a fault The fan purge mode is set FP XX value WT770 displays wrong mode C or F The WT770 can operate in both Deg C and Deg F mode as set in installer menu See page 24 for changing the CF XX value Cannot select multiple fan speeds WT770 set for single fan speed SW1 OFF Turn SW1 to ON NOTE 3 fan speed mode can only be used on single stage systems 39 Page WT770 Advanced Installer Manual V 3
21. gs Sw1 Off 1 speed fan Sw2 Off HC System Sw3 On Two Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 21 Page WT770 Advanced Installer Manual V 3 Attaching the Thermostat Check that the position of the 8 DIP switches matches the requirements of the equipment being controlled and the specific requirements of the user Detailed information on the 8 DIP switches can be found on page 5 of this manual Check the wiring matches that of the equipment the WT770 is to control and that all wiring is tight and not likely to short between adjacent wires Equipment wiring information can be found on page 12 of this manual If using the ModBus communication capability of the WT770 ensure the A B amp T data wires are in the correct position as an error here may affect the communication of the entire network See page 38 for detailed wiring of the communications port of the WT770 Using masking tape or similar block the hole in the wall where the wiring enters the back of the thermostat to prevent drafts that may travel down the inside of the wall cavity affecting the accuracy of the internally fitted temperature sensor Figure 14 Remove and discard the plastic tab on the internally fitted backup battery so that the battery is now in circuit and operating Take care not to damage the battery holder when doing this When attaching the th
22. he fan will stop after the heating stops This is done to prevent cold drafts that may occur on cold days when A C system is heating FO 2 Default in Start Stop Mode Available only if in Programmable Mode Sw6 on The Fan will Run continuously from program 1 or Start Program to program 4 or Stop program and then run in AUTO mode overnight to maintain the night time set points FO 3 Available only if in Programmable Mode Sw6 on This mode is the combination of option 1 and option 2 given above FP 1 Fan Purge Time Period Fan run on If fan mode is Auto Fan the indoor fan will run for FP XX minutes after heating or cooling has stopped to extract any stored energy in the coils etc Necessary for electric element heating Adjustable between off to 5 minutes in 1 minute intervals 26 Page WT770 Advanced Installer Manual V 3 Fn A Function Available Equipment Modes FN A Select if controlling a Heating amp Cooling system FN C Select if controlling a Cooling only system disables heating menus FN H Select if controlling a Heating only system disables cooling menus H3 Of W2 relay Function Only operates in single fan speed HP mode Sw1 off amp Sw2 on H3 Of W2 relay is used as 2nd or 3rd stage Auxiliary heat H3 EH W2 relay is used to control an Emergency Heating system H3 AH W2 relay is used to control a Add On Heat system H3 FF WT770 set up in Fossil Fuel
23. it the system 17 Page WT770 Advanced Installer Manual V 3 1 stage reverse cycle with auxiliary heat 1 speed indoor fan A Equipment Switch Settings Sw1 Off 1 speed fan Sw2 On HP System Sw3 Off One Stage Sw4 On Heat B Off Cool O Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Note Set SW4 to suit the system 18 Page WT770 Advanced Installer Manual V 3 2 stage heat pump with emergency heat w2 y2 Rly ed eww Lorjem vjac e ar 7 a SA Comp 2 Rahe RWValve comp 1 Fan comp 1 Fan rr lfc Equipment O See TT Terminals Options List Switch Settings Sw1 Off 1 speed fan Sw2 On HP System Sw3 On Two Stage Sw4 On Heat B Off Cool O Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Note Set W3 EH in the installer menu 19 Page WT770 Advanced Installer Manual V 3 Gas Heat Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Tip Set Installer menu Fn H 20 Page WT770 Advanced Installer Manual V 3 2 stage gas heat 2 stage add on cool w2 Y2 Rly zv acjs a r 7 i See TT Terminal Heat 2 1 Co 2 Heat cosin R JLo Equipment Switch Settin
24. mostat OFF tap the mode button to show OFF in the LCD Simply tap the fan button to cycle through the available fan speeds As the LCD changes to show the fan speed or fan mode you should here faint clicks as the WT770 internal relays change the equipment fan speed should change accordingly Test heating and cooling if both fitted Turn the WT770 to Auto season change mode by tapping the mode button until the words Heat and Cool are shown on the LCD Using the temp O or Temp O button set the desired temperature a few degrees below the ambient temperature After a few moments you will hear a click and the word Heat will change to Heating Verify that the heating system is on and operating correctly If stage 2 heat is being called the full stop on the end of the word MODE will be seen to indicate 2nd stage heat Stage 3 of heat is indicated by the full stop flashing Using the temp or Temp button set the desired temperature a few degrees above the ambient temperature After a few moments you will hear a click and the word Cool will change to Cooling Verify that the cooling system is on and operating correctly When stage 2 cool is being called the full stop on the end of word MODE mode will be seen to indicate 2nd stage cool Tap the mode button turn the WT770 OFF After any necessary timers have expired all heating cooling and fan functio
25. ns should stop Verify that the system has shut down Note in HP mode SW2 ON it is normal for the reversing valve to remain energized after the compressor has stopped This is done to prevent decompression HISS and to limit the wear on the reversing valve 30 minutes after the last reversing valve use it will de energize to conserve power If commissioning mode has been used it is important that the function be turned OFF before it is turned over to the user Using the User Manual as a guide set the real time clock and the preferred user program if applicable Explain equipment amp thermostat operation to the user Commissioning is complete 33 Page WT770 Advanced Installer Manual V 3 Using Remote Temperature Sensors Single or multiple room air temperature sensors can be connected to the WT770 TT terminals if temperature averaging over a larger area is desired 4 examples of commonly used sensor configurations are shown Note Either TT RS remote sensor or TT Av Averaging sensors value must be set in the advanced installer menu for these sensors to be used Please note the configuration of RS 01 amp RS 02 sensors in the examples provided above Other sensor configurations are also available A typical maximum of 40 meters is permitted for sensor runs with unshielded cable If longer distances are required a larger diameter 0 3mm shielded cable should be used When used in Start Stop commercial progr
26. ormation on this function 28 Page WT770 Advanced Installer Manual V 3 C2 0 0 Calibration Remote Sensor Calibration Offset for the TT terminal temperature sensor Adjustable range 4 5 deg C 9 F Co 0 41F Cooling OFF temperature Only operates if tt OA and outside temperature sensor is fitted Outside air temperature below this value will force the cooling function OFF Adjustable between 0 37c 32 98F Ho 35 95F Heating OFF temperature Only operates if tt OA and outside temperature sensor is fitted Outside air temperature above this value will force the heating function OFF Adjustable between 0 37c 32 98F HB 37 98F High Balance Point tt OA the outside temperature sensor must be fitted and Sw 1 off 2nd or 3rd stage heating is locked out when the outside air is above this temperature Adjustable between 0 37c 32 98F LB 9 5 15f Low Balance point tt OA the outside temperature sensor fitted H3 EH Sw 1 off and Sw2 on Outside temperatures below this value will automatically select Emergency Heat mode Adjustable between 9 5 25c 15 77F Ft off Filter warning time Return air filter cleaning warning time Adjustable between off and 900 hours Ad 07 ModBus Address ModBus communications address default do not change Bd 9 6 ModBus Baud Rate Bd 4 8 ModBus baud rate is 4 800 Baud Bd 9 6 ModBus baud rate is 9 600 Baud Default do not change Bd 19 2 Mod
27. s switch sets single set point mode imitating a simple mechanical thermostat or whether a separate heating and cooling set point can be selected by the user Two set point mode also permits the user to select a separate day and night set point if required 8 Page WT770 Advanced Installer Manual V 3 TT Terminal Functions Outside Air Sensor Wiring Set TT OA in the advanced installer menu The WT770 can display the outside air temperature if desired Some advanced control functions such as high and low balance points rely on this sensor to be fitted for correct operation RS 01 SMT 770 T Figure 1 Using a single pair of wires connect the TT terminals in the WT770 to the two terminals in the outside air temperature sensor If the outside air sensor fails two dashes will be shown on the LCD where the outside air temperature would normally be displayed to alert you of the problem Remote Air Temperature Sensor Wiring Set TT RS in the advanced installer menu Default RS 01 SMT 770 Switch ic HS i Figure 2 When you wish to measure the temperature from a location distant from the WT770 simply connect a remote temperature sensor to the TT terminals in the WT770 This will automatically disable the sensor fitted to the WT770 and use the remote temperature sensor s to control the room temperature See Figure 1 Should you wish you can easily switch the remote temperature sensor on and off there
28. selection of the correct positions for these function switches 6 Page WT770 Advanced Installer Manual V 3 Switch 1 Relay Assignment The WT770 is fitted with 5 relays capable of switching up to 24VAC 1Amp Switch 1 Fan Function Sets the function of these relays as either 3 fan speeds with 1 heat and 1 cool operation or single fan speed with 2 heat and 2 cool in either HP heat pump reverse cycle or HC heat with add on cool mode Switch 2 Equipment Type Both heat with add on cool or heat pump types of systems can be controlled by the WT770 Heat Cool System uses the W terminal s only for heating and the Y terminal s only for cooling Heat Pump systems use the Y terminal s for BOTH heating and cooling the compressor The W1 terminal to control the reversing valve which determines heating or cooling mode Switch 3 Equipment Stages When it is necessary to control a single stage A C system fitted with auxiliary heating elements turn Sw3 OFF thereby selecting single stage mode Heating elements controlled by the W2 output are now assigned as stage 2 heat Switch 4 Reversing Valve or Fan Mode When the WT770 is set for Heat Pump mode Sw2 is on then this switch sets the reversing valve logic O B When the WT770 is set for Heat Cool mode Sw2 is off then this switch sets the mode for the Heater fan logic HG or HE mode Switch 5 Anti Cycle Timer To protect some A
29. tart Stop Mode Commercial Thermostat Mode Sw6 on Sw8 off After hour run time period Adjustable range 0 off to 12 hours in 0 5 hour steps Setback 1 2 3 4 mode Residential programmable Mode Sw6 on Sw8 on Temporarily program override period Off Override till next program change or 1 12 hours fixed time override 25 Page WT770 Advanced Installer Manual V 3 SC OFF Stop Cooling temperature Comercial Mode Start stop mode Only Sw6 on Sw8 off Cooling temperature that will be maintained when running the STOP program Night Setback Adjustable between 5 37c 41 98F OFF SH OFF Stop Heating temperature Comercial Mode Start stop mode Only Sw6 on Sw8 off Heating temperature that will be maintained when running the STOP program Night Setback Adjustable between 5 35c 41 95F OFF Db 1 Single Set Point Dead band See page 31 for more information Dead band between heat and cool set point when in single set point mode sw8 off Adjustable between 0 and 5 deg in 0 5 c steps FO 0 2 Fan Options Advanced Fan Functions This function is only enabled when the selected fan mode is Fan On FAN ON will be displayed in the LCD to confirm this mode FO 0 Default Residential mode The fan will run continuously 24 hours a day 7 days a week FO 1 The fan will continue to run after the cooling stops to ensure the maximum fresh air ventilation and to aid in cooling T
30. y range 8 60c 17 140F Back light Blue EL Backlight life 3 000 hours to half brightness Communications Protocol IEEE 802 15 4 Sensor Reference Table KQ 243 22 0 20 0 18 1 16 2 14 3 13 7 12 5 11 4 10 4 10 0 9 57 8 75 C 6 8 10 12 14 16 18 20 22 24 26 28 30 F 42 8 46 4 50 53 6 57 2 60 8 64 4 68 71 6 75 2 77 78 8 82 4 38 Page WT770 Advanced Installer Manual V 3 Troubleshooting Symptom Suspected Fault Suggested remedy The word OFF is flashing in the LCD Mode button has no effect This is not a fault TT Of in advanced installer menu Some buttons do not appear to operate Padlock is show on LCD Key board lock is on LC XX value in advanced installer mode set the lock values see page 23 Cannot enter heat or cool Modes WT770 thermostat set for Heating or Cooling only modes Heating or cooling mode not available on your air conditioning system Cannot set heating and cooling to desired value Padlock symbol flashes This is not a fault HL XX heating set point limit and CL XX cooling set point limit restrict control range See page 24 for more detail Outside Air Temp display is showing dashes No outside air sensor fitted Outside air temperature air sensor has failed Check wiring and outside air sensor Replace outside air sensor Heat or Cool is
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