Honeywell W8635A User's Manual
Contents
1. W8635A SYSTEM TRANSFORMER A A FACTORY INSTALLER JUMPERS W8703A EXTERNAL 40 VA TRANSFORMER OPTIONAL TROL A TEMP V MODEL ARD PG OR MODEL ZD N SF TROL A TEMP MODEL AOBD ZONE DAMPER M13430A Fig 5 Three zone configuration WIRE NUT M13378 Fig 6 Using wire nut to pigtail a connection when three or more wires are terminated at one terminal Discovery Mode Discovery mode begins when the T8635L Thermostat and W8635 EIM are first installed and power is connected The W8635 EIM transmits information to the T8635L Thermostat that indicates the maximum number of stages that are enabled and the type of EIM connected The thermostat receives information from the W8635 and then sets the cycle rates and equipment types automatically Stage Configuration The W8635A automatically configures the T8635L for two stages of heat and two stages of cool If using the W8635A and the T8635L on a one heat one cool application set Installer Setup No 5 and 8 to 1 when configuring the T8635L Communicating Thermostat For configuration combinations see Table 3 Table 3 Stage Combinations Heat Stages Cool Stages 1 2 0 0 1 0 2 1 1 2 2 Cycle Rate The thermostat automatically sets2. EEPROM identification code is displayed Exit Installer Test Mode Run Program Thermostat returns to normal operating mode TROUBLESHOOTING GUIDE Refer to Table 7 for troubleshooting information Table 7 Troubleshooting Guide on at thermostat Symptom Possible Cause Action Display does not come Thermostat is not being powered Check if the thermostat is mounted and latched on the wallplate if not mount and latch the thermostat on the wallplate Check if the circuit breaker is tripped if it is reset the circuit breaker Check if the fuse is blown if it is replace the fuse Check if the power switch at the equipment is in the Off position if it is set to the On position Check for 24 Vac on terminals 2 and 3 replace any broken wires If 24 Vac is present on terminals 2 and 3 replace the thermostat 1 COM 2 COM or Thermostat is unable to 3 COM is displayed communicate with the W8635A and W8635A EIM Check the connection to terminal 1 at the thermostat replace any broken wires cycle power System Switch setting During Discovery Mode the Manually run Discovery Mode see Installer Setup displays off only thermostat did not correctly set manually configure heat and or cool stages the number of heat or cool stages Installer Setup 5 and 8 5 69 1339 2 W8635A EQUIPMENT INTERFACE MODULE Tab
3. bus terminals 1 2 and 3 INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat and W8635A EIM operation for each thermostat in the system Table 5 lists the available system tests Table 5 Installer System Tests Test Number System Test Description 10 12 Heating stages can be turned on and off in sequence 30 32 Cooling stages can be turned on and off in sequence 40 42 Fan and damper test 60 Keyboard keys test 70 74 Thermostat information including date code and software versions are displayed CAUTION Equipment Damage Hazard Minimum compressor off time is bypassed during Installer System Test Do not allow compressor rapid cycling on and off Observe compressor protection period To start the Installer System Test 1 Press and hold the T8635L Thermostat increase A and decrease W keys at the same time until 10 appears All display segments display before the 10 appears See Fig 7 and 8 SENATE Start Time JEA Temporary Setting Enrg aa FE e MonTueWedThuFriSatSun V Heat Cool A Outdoor WakeLeaveReturnSleep In Recovery Filter Auto Repl Batt System Em Heat M10345A Fig 7 LCD segments display M10257A TEST NUMBER Fig 8 Installer Test Number display 2 Refer to Table 6 for Installer System Test option Table 6 Installer System Test Options Key to Press Test Number Description Heating Equipment Syst
4. 6637A Fig 1 Selecting W8635A Equipment A CAUTION Interface Module location Mounting Location Hazard 2 Remove the from the W8635A lli Mounting W8635A inside HVAC equipment the edge of the modiis i aoe can damage the EIM a E hi inc hol Fig 2 Mount the W8635A only on the outside of HVAC Se wo Mmguning holes ere ates equipment Copyright 2000 Honeywell Inc U S Registered Trademark D i I M I I All Rights Reserved 69 1339 2 W8635A EQUIPMENT INTERFACE MODULE WALL o Na MOUNTING PREES MOUNTING SCREWS 2 4 VVVVvyvy M16636 Fig 2 Mounting W8635A Equipment Interface Module 4 Position the W8635A on the wall or on the cold air return 5 Level the W8635A for appearance only the device functions properly even when not level 6 Use a pencil to mark the position of the mounting holes on the wall or cold air return 7 Remove the W8635A from the wall or cold air return and drill 3 16 in holes in the wall if drywall where marked For firmer materials such as plaster or wood drill 7 32 in holes 8 When mounting on the cold air return drill a pilot hole where marked 9 Gently tap the anchors provided into the holes until flush with the wall 10 Reposition the W8635A over the holes 11 Loosely insert the screws into the holes and tighten each screw WIRING All wiring must comply with local electrical codes and ordinances Se
5. Honeywell W8635A Equipment Interface Module INSTALLATION INSTRUCTIONS tronic Communicating Programmable Thermostat The APPLICATION W8635A can be used with up to 2 heat 2 cool conven i tional applications See Table 1 The W8635A Equipment Interface Module EIM pro vides 24 Vac control of single or multistage conventional HVAC equipment when used with a T8635L Microelec Table 1 Description Model Application Stages Terminals Comments W8635A Conventional gas oil Up to 2 heat 1 2 3 C R Rh Rc Use with T8635L Communicating or electric heat 2 cool G W1 W2 Y1 Y2 Thermostat INSTALLATION 1 Locate the W8635A in the equipment room near the HVAC equipment See Fig 1 When Installing this Product 1 Read these instructions carefully Failure to follow these instructions can damage the product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After completing installation use these instructions to check out the product operation W8635 POSSIBLE PAR MOUNTING CAUTION POSSIBLE LOCATION MOUNTING Voltage Hazard Can cause electrical shock or equipment damage Disconnect power before supply before beginning installation LOCATION Location FURNACE OR BOILER WATER HEATER M1
6. e Fig 4 through 6 wiring diagrams for specific equipment applications Refer to Table 2 for terminal designations A CAUTION Voltage Hazard Can cause electrical shock or equipment damage Disconnect power before beginning installation 1 Loosen the terminal screws on the W8635A and connect the system wires See Fig 3 2 Securely tighten each terminal screw 69 1339 2 FOR STRAIGHT CONNECTION STRIP 5 16 IN 8 MM FOR WRAPAROUND CONNECTION STRIP 7 16 IN 11 MM W8635 M16639 Fig 3 Wiring the W8635A terminals Table 2 Terminal Designations W8635A Terminal Designations 1 Function To Communicating Thermostat Terminal 1 2 To Communicating Thermostat Terminal 2 3 To Communicating Thermostat Terminal 3 R 24 Vac System Transformer Rh 24 Vac Heating Transformer Re 24 Vac Cooling Transformer Cc 24 Vac Transformer Common G Fan Relay wi Stage 1 Heat Relay W2 Stage 2 Heat Relay Y1 Stage 1 Cool Relay Y2 Stage 2 Cool Relay Green LED Indicates Data Communication C7089B OUTDOOR TEMPERATURE SENSOR T8635L OO HOT SYSTEM TRANSFORMER A A FACTORY INSTALLER JUMPERS M13429 Fig 4 2H 2C single transformer W8635A EQUIPMENT INTERFACE MODULE T8635L T8635L OO I C7089B OUTDOOR TEMPERATURE SENSOR T8635L
7. em Test 10 Enter Heating Equipment system test A 11 First Stage Heat turns on A 12 Second Stage Heat turns on v 11 Second Stage Heat turns off v 10 First Stage Heat turns off Cooling Equipment System Test Enter Cooling Equipment system test A 31 First Stage Cool turns on A 32 Second Stage Cool turns on v 31 Second Stage Cool turns off v 30 First Stage Cool turns off 69 1339 2 4 W8635A EQUIPMENT INTERFACE MODULE Table 6 Installer System Test Options Continued Key to Press Test Number Fan and Damper Test Damper Test available only when using W8703A Description 40 Enter Fan and Damper test 41 Fan turns on damper for this zone opens 42 Damper closes for this zone if not already closed fan stays on 41 Damper opens for this zone v 40 Fan turns off Key Operation Test ie Enter Key Operation test Press any key to test if the key is functional Each time a key is pressed a different number is displayed This indicates the key is functioning properly Pressing enters the next test Thermostat Information Enter Thermostat Information mode A 71 Production date code is displayed The first two large digits are the month and the third digit is the last digit of the year example 031 March 2001 A 72 Software identification code is displayed A 73 Software revision number is displayed A 74
8. le 7 Troubleshooting Guide Continued Symptom Heating does not come on System on indicator heat displays Possible Cause Communication is not being completed Heat load at W8635A is not connected correctly Action End and repeat the call for heat Check the Flash COM OK LED on the W8635A EIM while the call is being made If the Flash COM OK LED does not blink check communication Bus wiring If the Flash COM OK LED blinks check that 24 Vac is present at W1 terminal If 24 Vac is not present check R to Rh connection If the connection is good replace the W8635A EIM Cooling does not come on System on indicator cool displays Communication is not being completed Cool load at W8635A is not connected correctly End and repeat the call for cool Check the Flash COM OK LED on the W8635A EIM while the call is being made If the Flash COM OK LED does not blink check communication bus wiring If the Flash COM OK LED blinks check that 24 Vac is present at Y1 terminal If 24 Vac is not present check R to Rh to Rc jumper connection If the R to Rh to Re connection is good replace the W8635A EIM wait is displayed and the call for Cool has not started Compressor protection is in effect Compressor protection can be set from 0 to 5 minutes to prevent compressor damage due to rapid cycling Wait until the compressor protection period expires T
9. o bypass compressor protection during the installation phase see the Installer System Test section 2nd stage heat or cool does not energize Stage configuration not set correctly to match the number of selected stages Cool load at W8635A is not connected correctly Set the Stage configuration in Installer Setup for two stages or heat and or two stages of cool Check that 24 Vac is present at Y2 or W2 terminal If 24 Vac is not present all connections are good and the thermostat is correctly configured replace W8635A EIM Fan does not come on with a call for electric heat Electric heat setting is not configured Fan load at W8635A is not connected correctly Set Installer Setup No 4 to 1 for electric heat Check that 24 Vac is present at G terminal If 24 Vac is not present all connections are good and the thermostat is configured replace the W8635A EIM Honeywell Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Home and Building Control Honeywell Limited Honeywell Limit e 155 Gordon Baker Road North York Ontario Minneapolis MN 55408 0524 69 1339 2 G H Rev 6 00 M2H 3N7 Printed in U S A on recycled paper containing at least 10 www honeywell com post consumer paper fibers
10. the cycle rate based on the information it received during Discovery Mode See Table 4 To change the default cycle rate settings enter T8635L Thermostat Installer Setup and select the desired cycle rate settings for each stage All stages can be set between 1 and 12 cph Table 4 Default Cycle Rate Settings 4st ond 4st ond W8635A Equipment Stage Stage Stage Stage Heat Cool Cool Interface Heat Module 6 cph 6 cph 3 cph 3 cph Electric Heat Setting When using the W8635A on an electric heat application set the T8635L Thermostat Installer Setup No 4 to 1 This instructs the W8635A EIM to energize the fan with any call for heat 3 69 1339 2 W8635A EQUIPMENT INTERFACE MODULE Flash COM OK LED Description LED blinks rapidly indicates device is currently trans mitting information on the communications bus LED blinks once indicates device received and acknowledged a message LED on constantly indicates device failure Replace device LED off constantly indicates a wiring problem if device is not functioning properly and there is no LED activity at least once a minute Check wiring to communications bus terminals 1 2 and 3 NOTE Itis normal for LED to blink continuously dur ing startup and discovery LED blinks continuously indicates a wiring problem if device is not functioning properly and there is a continuous series of LED blinks Check wiring to communications
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