75 Commercial Programmable hermostat FOR SINGLE- OR MULI-SAGE CONVENIONAL/ PUMP SYSEMS APPLICAION he 75 Commercial Programmable hermostat controls Vac commercial single zone heating, ventilating and air conditioning (HVAC) equipment. he 75 consists of a thermostat and subbase. he thermostat includes the display and keypad for 7-day programming. he subbase includes equipment control connections. he subbase mounts on the wall and the thermostat mounts to the subbase. MERCURY NOICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control. If you have questions, call Honeywell Customer Care Center at -800-68-50. INSALLAION When Installing this Product.... Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.. Check ratings given in instructions and on the product to ensure the product is suitable for your application.. Installer must be a trained, experienced service technician.. After installation is complete, check out product operation as provided in these instructions. CAUION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. INSALLAION INSRUCIONS Location Do not install the thermostat where it can be affected by: drafts, or dead spots behind doors and in corners. hot or cold air from ducts. radiant heat from sun or appliances. concealed pipes and chimneys. unheated (uncooled) areas such as an outside wall behind the thermostat. IMPORAN o avoid electrical interference, which can cause erratic performances, keep wiring runs as short as possible and do not run thermostat wires adjacent to the line voltage electrical distribution systems. Use shielded cable. he cable shield must be grounded only at the controlled equipment case. Subbase WHEN USED O SENSE ROOM EMPERAURE Install the thermostat about 5 ft. (.5m) above the floor in an area with good air circulation at average temperature. (See Fig..) WHEN NO USED O SENSE ROOM EMPERAURE When using the remote-mounted temperature (and humidity) sensor(s) to sense ambient conditions, install the thermostat in an area that is accessible for setting and adjusting the temperature and settings. Install the remote-mounted sensor(s) about 5 ft. (.5m) above the floor in an area with good air circulation at average temperature (See Fig. ). If multiple remote sensors are required, they must be arranged in a temperature averaging network consisting of four sensors (See Fig. ). Only 7770 models with no setpoint adjustment can be used for temperature averaging. 6-058
SUBBASE YES NO 7770A 7770A NO NO 5 FEE (.5 MEERS) 7770A 7770A M8A Fig.. ypical location of thermostat or remote-mounted sensor. Mounting Subbase he subbase mounts horizontally. IMPORAN When using the internal temperature or humidity sensor, the device must be mounted horizontally (with the LCD facing upwards). Precise leveling is not needed. When using remote room temperature and humidity sensors, thermostat mounting orientation does not matter. Wall mounting (using standard drywall screws) is standard. Mounting to a in. by in. (50.8 mm by 0.6 mm) wiring box can be accomplished: for a horizontal box, no extra hardware is required. for a vertical box, part 0965A is required. Mount to European standard wall box (having. in. (60. mm) between mounting screws in a horizontal line) with or without adaptive hardware.. Position and level the subbase. A level wallplate is only for appearance. he thermostat functions properly when not level.. Use a pencil to mark the mounting holes. (See Fig. ).. Remove the subbase from the wall and drill two / 6 in. (.8 mm) holes in the wall (if drywall) as marked. For firmer material such as plaster or wood, drill two 7/ in. (5.6 mm) holes.. Gently tap anchors (provided) into the drilled holes until flush with the wall. 5. Position the subbase over the holes, pulling wires through the wiring opening. 6. Loosely insert the mounting screws into the holes. 7. ighten mounting screws. Fig.. Four 7770A Sensors providing temperature averaging network for 75 hermostat. WALL ANCHORS () Fig.. Mounting the subbase. Mounting hermostat on Subbase (Fig. ) With the subbase installed, mount the thermostat:. Engage top subbase tabs into the thermostat top.. Swing the thermostat down.. Press the lower edge of the case to latch. WIRES HROUGH WALL MOUNING HOLES M9606A MOUNING SCREWS M9608 o remove the thermostat from the wall, first pull out at the bottom of the thermostat; then remove the top. 6-058
A. ENGAGE ABS A OP OF HERMOSA AND SUBBASE OR WALLPLAE. SEINGS Using hermostat Keys he thermostat keys are used to: set current time and day, program times and setpoints for heating and cooling, override the program temperatures, display present setting, set system and fan operation. See Fig. 5 for keypad information. B. PRESS LOWER EDGE OF CASE O LACH. Setting emperature Refer to able for the default temperature setpoints. o set the and Not Heat and Cool setpoints, simply press the Heat and Cool button under the or Not area of the keypad. o set the Standby Heat setpoint, press both the and Not Heat buttons simultaneous. o set the Standby Cool setpoint, press the Cool and Not Heat buttons simultaneously. Setting System and Fan System default setting is Auto. Fan default setting is On. M9609 Fig.. Mounting thermostat on subbase. Wiring Follow equipment manufacturer wiring instructions when available. Refer to the Wiring Diagram section for typical hookups. A letter code is located near each terminal for identification. IMPORAN All wiring must comply with local electrical codes and ordinances. Maximum (and recommended) wire size is 8- gauge. Do not use wire smaller than -gauge.. Loosen subbase terminal screws and connect system wires.. Securely tighten each terminal screw.. Push excess wire back into the hole in the wall.. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. Use System and Fan keys to change settings. System Settings Auto: hermostat automatically changes between heating and cooling based on indoor temperature. Cool: hermostat controls cooling. Off: Heating, cooling, and fan are all off. Heat: hermostat controls heating. Em Heat: Auxiliary heat serves as first stage. Compressor stages are locked off. Fan Settings On: See able. Auto: Fan always cycles with call for heat or cool. Conventional: he equipment (i.e. plenum switch) controls fan operation in heat mode. hermostat controls fan operation in cool mode. Electric Heat: hermostat controls fan operation in both heat and cool modes. NOES: Fan operation can extend (delay Off) after the heating/cooling turns off: Heating choices are 0 or 90 seconds. Cooling choices are 0 or 0 seconds. able. Fan On Control Logic. Occupancy Call for Heat/Cool Scheduled Sensor Signal Yes No On On Standby On Off a Standby On On Not On Off a a In heat mode, when set for conventional heat, the equipment (i.e. plenum switch) could power the fan despite the 75. 6-058
emperature Not COOL COOL Set Day/ime Day ime Override emporary emporary Not Day Schedule Clear Not Start ime Copy System COOL Fan ON AUO Run Schedule M960 Fig. 5. hermostat key locations. INSALLER SEUP For most applications, the thermostat factory settings do not need to be changed. Review the factory settings in able. When power is first applied to the thermostat, the display will show all segments (see Fig. 6). able. Default Setpoints. Control Not Standby Heating 70 F ( C) 55 F ( C) 67 F (9 C) Cooling 75 F ( C) 85 F (9 C) 78 F (6 C) emporarystandby Set Set Schedule Room Not Startime AM PM % MonueWedhuFri SatSunHol MinsDays System Fan EmHeat Off CoolAuto Dehumid OnAuto Fig. 6. LCD display of all segments. M96 CAUION Possible Equipment Damage. Fan must be running when system is operating. Heat pump and electric heat systems must be configured correctly to prevent equipment damage caused by the system running without the fan. Setup Using Keypad he installer uses the Installer Setup to customize the thermostat to specific systems A combination of key presses are required to use the Installer Setup feature:. o enter the Installer Setup, press and hold both the Run Schedule and the Copy keys until DEGREES 00 (or DEGREES 0) displays. Installer Setup will display WAI and is unavailable for 0 seconds after power up.. o advance to the next Installer Setup number, press. Pressing Run/Copy again while in this mode displays the 75 firmware version number.. o return to a Setup item, cycle through the options.. o change a setting, use the up! or down " key. 5. o exit the Installer Setup, press Run Schedule. 6. Display prompts SAV CFG (save configuration). a. If you want to save the new configuration, use the up! or down " key to change NO to YES before pressing Run Schedule. b. If you want the configuration to remain as it was before starting this change, ensure the display indicates SAV CFG NO and press Run Schedule. Installer Setup is automatically exited after five minutes with no key pressed. Upon this automatic exit, all changes are lost. Configuration Configuration can be done with the keypad using the Installer Setup (ISU). 6-058
able. Installer Setup. ext Default Choices Notes DEGREES 0 0 - Degree emperature Format 0: Degrees F : Degrees C CLOCK 0 0 - Clock Display Format 0: hour : hour KEYLOCK 0 0 - Keypad Lockout Level 0: None : Lockout all keys except Set Day, Set ime, Set Date, Set Holidays, emporary, emporary Not, System, Fan, Up, Down and Information : Lockout all keys except Set Day, Set ime. Set Date, Set Holidays, emporary, emporary Not, Up, Down and Information : Lockout all keys except Information PMP 0 0 - Application ype Selection 0: Conventional : Heat Pump - Cooling (Energize O/B on call for cool) : Heat Pump - Heating (Energize O/B on call for heat) COOLSG 0 - Number of Cooling Stages 0: 0 Stages of Cooling : Stages of Cooling : Stages of Cooling : Stages of Cooling : Stages of Cooling (W will be used as th stage relay) SG 0 - Number of Heating Stages 0: 0 Stages of Heating : Stages of Heating : Stages of Heating (his is the max if cooling stages is selected) : Stages of Heating AUX SG 0 0 - Only shown when Heat Pump is selected 0: 0 Aux Stages : Aux Stages : Aux Stages AUX CON 0 0 - Aux Contact Functionality 0: ime of Day : Economizer : Dehumid - Hot Gas Bypass : Simple Dehumid WALLMOD 0 0 - Remote Room Sensor Selection 0: Local sensor only : 7770A/D (Remote Sensor, No Remote Setpoint, Bypass 0) : 7770B/C (Remote Sensor, Remote Setpoint, Bypass 0) : 777 (Remote sensor, Remote Setpoint, Bypass ) (Display only if sub-base,, +) (his item is not displayed when OASENS 0 0 - Outdoor Air Sensor Selection 0: None : Remote Outdoor Air Sensor DASENS 0 0 - Discharge Air Sensor Selection 0: None : Remote Discharge Air Sensor HUMSENS 0 0 - Room Humidity Sensor selection 0: None : On Board Sensor : Remote Sensor OCCSENS 0 0 - Occupancy Sensor Selection 0: None : Remote Occ Sensor FAN H 0 0 - Fan Operation on Heat 0: Conventional (Equipment controls Fan) : Electric (hermostat turns on Fan with call for Heat) 5 6-058
able. Installer Setup. (Continued) ext Default Choices Notes XFAN H YES YES or NO Extended Fan on Heat NO: None YES: 90 seconds XFAN CL NO YES or NO Extended Fan on Cool NO: None YES: 0 seconds SRDEL 0 0-5 Sequential Start Delay 0 to 50 seconds in 0 second increments ADVANCE NO YES or NO Advanced Settings NO: Hide YES: Show MP LIM 0-5 emporary Setpoint Adjustment 0: 0 Deg. F : Deg. F : Deg. F : Deg. F : Deg. F 5: 5 Deg. F MP OCC - 8 emporary Duration to 8 hours MP CAL 0 - - emporary Display Adjustment 0 - = 0 to DDF - 7 = - to - DDF MINCOOL MAX 5 F (7 C) 90 F ( C) 5-99 F (7-7 C) 0-90 F ( - ) Min Cool Setpoint Max Heat Setpoint LCK NO YES or NO Heating Lockout (Only displayed if Outdoor Air Sensor is selected) NO: None YES: Enabled HLCKSP 70 F ( C) -0-0 F (-0-9 F) 6-058 6 Heating Lockout emperature (Display only if Remote Outdoor Air Sensor is configured) COOLLCK NO YES or NO Cooling Lockout (Only displayed if Outdoor Air Sensor is Selected) NO: None YES: Enabled CLLCKSP 5 F ( C) -0-0 F (-0-9 C) Cooling Lockout emperature (Display only if Remote Outdoor Air Sensor is configured) DA LL NO YES or NO Discharge Low Limit (Only displayed if Discharge Air Sensor is Selected) NO: None YES: Enabled DALLSP 5 F (7 C) 5-60 F ( - 6 C) Discharge Low emp Limit (Display only if Discharge Sensor is configured) DA HL NO YES or NO Discharge High Limit (Only displayed if Discharge Air Sensor is Selected) NO: None YES: Enabled DAHLSP 0 F ( C) 65-0 F (8-60 C) Discharge High emperature Limit (Display only if Discharge Sensor is configured) DEHUMID 0 0-5 Dehumidification 0: None : MinOn ime : Reset emp Setpoint : Reset w/ MinOn : Reheat 5: Reheat w/ Min On DEH MIN 5 5-5 Dehumidify Minutes On DEH MP - 5 Dehumidify emp Reset MINHR 5 0-0 DDF/HR Minimum Heat Recovery Ramp Rate MAXHR 8 0-0 DDF/HR Maximum Heat Recovery Ramp Rate (Only Displayed if Outdoor Sensor is Selected) MINHOA 0 F (-8 C) -0-0 F (-9-9 C) Minimum Heat Outdoor Air emperature (Only Displayed if Outdoor Sensor is Selected)
able. Installer Setup. (Continued) ext Default Choices Notes MAXHOA 0 F ( C) -0-0 F (-9-9 C) 75 COMMERCIAL PROGRAMMABLE HERMOSA Maximum Heat Outdoor Air emperature (Only Displayed if Outdoor Sensor is Selected) MINCLR 0-0 DDF/HR Minimum Cool Recovery Ramp Rate MAXCLR 6 0-0 DDF/HR Maximum Cool Recovery Ramp Rate (Only Displayed if Outdoor Sensor is Selected) MINCLOA 90 F ( C) -0-0 F (-9-9 C) Minimum Cool Outdoor Air emperature (Only Displayed if Outdoor Sensor is Selected) MAXCLOA 70 F ( C) -0-0 F (-9-9 C) DSMON 0 - DLS Spring Month DSDAY 0 0 -, - 7 DLS Spring Day 0 - = Day of Month = Last Day of Month = First Sunday etc DSMON 0 - DLS Fall Month DSDAY 0 -, - 7 DLS Fall Day 0 - = Day of Month = Last Day of Month = First Sunday etc H RESP 0-0: Standard - cph : Medium - 6 cph : Fast - 9 cph : Super Fast - 0 cph CL RESP 0 0-0: Standard - cph : Fast - cph Maximum Cool Outdoor Air emperature (Only Displayed if Outdoor Sensor is Selected) (DayLight Savings options only display when Date is valid) Holidays and 65 - Day Clock he 75can be configured to schedule up to 0 separate holidays, each with a duration of up to 99 days. o enable this function, the user must set the date:. Press Set Day and Set ime keys simultaneously.. Use the Up/Down keys to set the date to YES, then press the key.. Use the Up/Down keys to set the month, then press the key.. Use the Up/Down keys to set the day, then press the key (See able for valid day choices). 5. Use the Up/Down keys to set the year, then press the key. Holidays can be set in the following manner:. Press the emporary and emporary Not keys simultaneously.. he month (MON) of the first holiday is then displayed (00 means the holiday is ignored).. Use the Up/Down keys to set the month, then press the key.. Use the Up/Down keys to set the day, then press the key (see able for valid day choices). 5. Use the Up/Down keys to set the duration. he first holiday is now set and pressing the key will take you to programming the second holiday (denoted by the number on the screen). able. Valid Day Values. Value Description Value Description Value Description Value Description to Day of month Second uesday 5 hird Saturday 6 Fifth Wednesday Last Day of Month Second Wednesday 5 Fourth Sunday 65 Fifth hursday First Sunday Second hursday 55 Fourth Monday 66 Fifth Friday First Monday 5 Second Friday 56 Fourth uesday 67 Fifth Saturday 5 First uesday 6 Second Saturday 57 Fourth Wednesday 68 Last Sunday 6 First Wednesday 7 hird Sunday 58 Fourth hursday 69 Last Monday 7 First hursday 8 hird Monday 59 Fourth Friday 70 Last uesday 8 First Friday 9 hird uesday 60 Fourth Saturday 7 Last Wednesday 9 First Saturday 50 hird Wednesday 6 Fifth Sunday 7 Last hursday 0 Second Sunday 5 hird hursday 6 Fifth Monday 7 Last Friday Second Monday 5 hird Friday 6 Fifth uesday 7 Last Saturday 7 6-058
able 5. 75 Key Function Summary. Grouping Button Definition Information Down Arrow " Lowers setpoint, day, or time. When setting times or temperatures, hold key down to continuously decrease value. Also can make temporary change in temperature setpoint. Information Obtains information (where humidity high-limit can be set), cycles through setup options. Up Arrow! Raises setpoint, day, or time. When setting times or temperatures, hold key down to continuously increase value. Also can make temporary change in temperature setpoint. emperature Sets Heat setpoint. Heat Sets Cool setpoint. Cool Not Heat Sets Not Heat setpoint. Not Cool Sets Not Cool setpoint. Set Day Sets day of week. apping key with 'Set Value' segment on increases current day (same effect as Up Arrow key). ime Sets time. apping key with Set Value segment on increases time in one hour increments. Override emporary emporary Not emporary occupied setting for length of time defined by installer. User can modify setpoints. Sets holiday length. User selects number of days ( 0-99 ), or --- for continuous override. Schedule Day Selects day schedule to modify. (Used also with copy key.) Not Clear Start ime Copy System Fan Selects occupied event start times for specified day. Repeatedly press this key to toggle between two occupied events. Selects not occupied event start times for specified day. Repeatedly press this key to toggle between two not occupied events. Clears start time for specified period and day. Copies schedule from one day to another. Selects System Mode. oggles through Em Heat, Heat, Off, Cool, and Auto. Selects fan operation mode. oggles between On and Auto. a Run Schedule a On: Continuous fan operation (occupied and standby). During not occupied periods, fan cycles with call for heat or cool. Auto: Fan cycles with call for heat or cool during all periods. (See Product Data Sheet, form 6-605, for more details). NOES: he display returns to default screen after pressing Run Schedule (or after a period of time without keypress): ten seconds: when returning from temporary setpoint changes, info screen, temp occ, and temp not occ. one minute: when returning from setting clock/day. ten minutes: when returning from System Checkout. five minutes: when returning from all other modes. Special Functions Resumes running schedule (cancels emporary action, Holiday, and/or emporary setpoint changes.) Restore Factory Configuration (Run/Clear) IMPORAN his operation erases current configuration and restores factory defaults for all configuration, parameters, setpoints and schedules. o regain the old requires device reconfiguration.. Press both Run Schedule and Clear Start ime.. he display gives the option to revert to FAC CFG. a. o restore the factory defaults, press up! or down " until the display indicates YES. b. o cancel this option, ensure the display indicates NO.. Press Run Schedule. 6-058 8
Get Factory Schedule (Info/Clear) Performing this operation reverts the schedules to the factory defaults:. Press both Info and Clear Start ime.. he display gives the option to revert to FAC SCH. a. o restore the factory schedule, press up! or down " until the display indicates YES. b. o cancel this option, ensure display indicates NO.. Press Run Schedule. est Mode (/Not /Schedule Day) CAUION Possible Equipment Damage. Equipment damage can result if compressor is cycled too quickly. he minimum off time for compressors is bypassed during est Mode. Equipment damage can occur if the compressor is cycled too quickly. Use the est Mode to check the thermostat configurations and operation. o start the system test:. Press Schedule Day, and Not simultaneously.. he display gives the option to ES. a. o enter test mode, press up! or down " until the display indicates IN ES. b. o cancel this option, ensure display indicates NO ES.. Press Run Schedule. NOES: o verify whether or not the system test is still active, repeat the above process. he system test times out after ten minutes with no key pressed. Save User Schedule (Info/Copy) Performing this operation saves the current schedule (including holidays) to memory, overwriting the old saved schedule:. Press both Info and Copy.. he display gives the option to revert to SAV SHD. a. o save the current schedule, press up! or down " until the display indicates YES. b. o cancel this option, ensure display indicates NO.. Press Run Schedule. Get User Schedule (Info/Run) Getting the user schedule restores the schedule (including holidays) from saved memory, overwriting the schedule currently in use:. Press both Run Schedule and Info.. he display gives the option to GE SHD. a. o retrieve the saved schedule, press up! or down " until the display indicates YES. b. o cancel this option, ensure display indicates NO.. Press Run Schedule DEHUMIDIFICAION here are five methods through which the 75 can control for dehumidification. hree of them modify the control algorithm, thus providing limited dehumidification through cooling. he other two use the auxiliary output to control another device. he dehumidification high limit can be set within the range of 0 to 90 percent relative humidity. Control hrough Cooling Configure using some combination of the following: Minimum On. Reheat. Reset. NOES: hese methods operate only during cooling. Selecting both Reheat and Reset options can cause frequent setpoint adjustments. his selection is not recommended. Min. ON ime Dehumidifies by increasing the compressor minimum on time (normally minutes) by a programmable amount. his is useful with oversized systems in that it forces the coils to cool to a point where dehumidification can occur. NOES: Can force wider temperature swings by cooling when setpoint control does not require it. he minimum on time can be set within the range of 5 to 5 minutes. Hysteresis and a minimum timer are used to ensure this behavior does not change with every equipment cycle. Reheat Dehumidifies by operating cooling during typical off time. he 75 maintains the proper setpoint by running the heat at the same time. IMPORAN At times during Reheat dehumidification, the 75 operates heating and the cooling simultaneously. his is normal. NOES: he heat stage never energizes during Reheat if more than one cool stage is on. Reheat mode cannot occur during heating. Reset emp SetPt he room temperature set point resets to a specified number of degrees below the actual set point when room relative humidity (RH) rises above humidity high limit set point. hough this may not technically reduce relative humidity in the room, it reduces the dew point to provide the customer with a sense of comfort due to a lower temperature setting in the room. As long as RH stays above humidity high limit set point, this set point is maintained. Hysteresis and a minimum timer prevent the set point from short interval alternation (between standard and reset set points). 9 6-058
Options Utilizing Auxiliary Output here are two dehumidification options that utilize the auxiliary output. hey are: Simple Dehumidification. Hot Gas Bypass Dehumidification. Simple Dehumid(ification) he auxiliary output: Energizes when RH rises above humidity high limit. De-energizes when RH drops below humidity high limit. NOES: Hysteresis and a minimum timer prevent short cycling of this output. Unlike Dehumid Hot Gas BP the relay remains energized during calls for multiple cooling stages. WIRING DIAGRAMS Dehumid Hot Gas BP he auxiliary output operates as shown in able 6. able 6. Hot Gas Bypass Dehumidification Logic. Humidity Cooling Stages Active Auxiliary Output High more than one De-energized High one or less Energized Low more than one De-energized Low one or less De-energized Auxiliary output during call for multiple cooling stages for two reasons:. his method assumes that the cooling provides dehumidification.. Multiple cooling stages probably provide necessary dehumidification.. Hysteresis and a minimum timer prevent short cycling of this output. 7770 REMOE OUDOOR AIR CONACOR 9 8 7 6 5 DISCHARGE AIR RELAY SUBBASE 5 6 7 OS OS AS AS W Y HS HC HP M M X RH RC AUX W Y G HUMIDIY MOION RELAY FAN RELAY CONACOR L L (HO) ECONOMIZER L L (HO) ING RANSFORMER COOLING RANSFORMER POWER SUPPLY. PROVIDE DISCONNEC MEANS AND OVERLOAD PROECION AS REQUIRED. WHEN INSALLED ON A SYSEM WIH WO RANSFORMERS, REMOVE HE FACORY-INSALLED JUMPER. USE ECONOMIZER INSRUCIONS FOR INSALLAION DIRECIONS. M5 Fig. 7. ypical hookup of 75F00 in two-stage heat and two-stage cool heat pump system with two transformers. 7770 REMOE OUDOOR AIR RELAY 9 8 7 6 5 DISCHARGE AIR CONACOR CONACOR SUBBASE 5 6 7 OS OS AS AS W/Y Y W Y HS HC HP M M X RH RC AUX W Y G CONACOR HUMIDIY MOION RELAY FAN RELAY L L (HO) CONACOR ECONOMIZER POWER SUPPLY. PROVIDE DISCONNEC MEANS AND OVERLOAD PROECION AS REQUIRED. ENSURE RANSFORMER IS SIZED O HANDLE HE LOAD. /COOL SYSEMS WIH ONE RANSFORMER REQUIRE HE FACORY-INSALLED JUMPER. USE ECONOMIZER INSRUCIONS FOR INSALLAION DIRECIONS. M9768A Fig. 8. ypical hookup of 75F0U in two-stage heat and four-stage cool conventional system. 6-058 0
7770 REMOE OUDOOR AIR ECONOMIZER CONACOR 9 8 7 6 5 DISCHARGE AIR RELAY RELAY SUBBASE 5 6 7 OS OS AS AS AUX W/Y Y W Y HS HC HP M M X RH RC AUX W Y G CONACOR HUMIDIY MOION RELAY FAN RELAY L L (HO) CONACOR POWER SUPPLY. PROVIDE DISCONNEC MEANS AND OVERLOAD PROECION AS REQUIRED. ENSURE RANSFORMER IS SIZED O HANDLE HE LOAD. /COOL SYSEMS WIH ONE RANSFORMER REQUIRE HE FACORY-INSALLED JUMPER. USE ECONOMIZER INSRUCIONS FOR INSALLAION DIRECIONS. M59 Fig. 9. ypical hookup of 750F00 in three-stage heat and three-stage cool conventional system with one transformer. ROUBLESHOOING GUIDE (ABLE 7) able 7. roubleshooting Information. Symptom Possible Cause Action Display will not come on. emperature display is incorrect. emperature settings will not change. (Example: Cannot set heating higher or cooling lower.) Room temperature is out of control. hermostat is not being powered. hermostat is configured for F or C display. Bad thermostat location. Display shows three dashes and a degree sign (all systems shut down). Upper or lower temperature limits were reached. setpoint temperature range stops were configured. Keypad is locked. When a locked key is pressed, LOCKED appears momentarily on the LCD. Remote temperature sensing is not working. Check that X terminal is connected to the system transformer. Check for Vac between X and RH terminals. If missing Vac: Check if circuit breaker is tripped; if so, reset circuit breaker. Check if system fuse is blown; if so, replace fuse. Check if the HVAC equipment power switch is in the Off position; if so, set to the On position. Check wiring between thermostat and HVAC equipment. Replace broken wires and tighten loose connections. If Vac is present, proceed with troubleshooting. Press both Run Schedule and Copy, then reconfigure the display. Relocate the thermostat. 75 is set for remote sensing and sensor is missing or circuit is either open or shorted. Check the temperature setpoints: Heating limits are 0 to 90 F (7 to C) Cooling limits are 5 to 99 F (9 to 7 C) Check setpoint stops. If necessary, reconfigure the stop(s). Press both Run Schedule and Copy, then change keypad lock level. Check all remote sensors. 6-058
able 7. roubleshooting Information. (Continued) Symptom Possible Cause Action Heat will not come on. Cooling will not come on. System indicator (flame: heat, snowflake: cool) is displayed, but no warm or cool air is coming from the registers. No power to the thermostat. hermostat minimum off time is activated. System selection is set to Off or Cool. No power to the thermostat. hermostat minimum off time is activated. System selection is set to Off or Heat. he call for heat or cool is not yet given. Conventional heating equipment turns the fan on only after the furnace has warmed to a setpoint. Heating or cooling equipment is not operating. Check that X terminal is connected to the system transformer. Check for Vac between X and RH terminals. If missing Vac: Check if circuit breaker is tripped; if so, reset circuit breaker. Check if system fuse is blown; if so, replace fuse. Check if the HVAC equipment power switch is in the Off position; if so, set to the On position. Check wiring between thermostat and HVAC equipment. Replace broken wires and tighten loose connections. If Vac is present, proceed with troubleshooting. Wait up to five minutes for the system to respond. Configure heating response. Set system selection to Heat or Auto. Check that X terminal is connected to the system transformer. Check for Vac between X and RH terminals. If missing Vac: Check if circuit breaker is tripped; if so, reset circuit breaker. Check if system fuse is blown; if so, replace fuse. Check if the HVAC equipment power switch is in the Off position; if so, set to the On position. Check wiring between thermostat and HVAC equipment. Replace broken wires and tighten loose connections. If Vac is present, proceed with troubleshooting. Wait up to five minutes for the system to respond. Configure cooling response. Set system selection to Cool or Auto. Check if any stage indicators (dots next to the system indicator) are displayed. With no display of stage indicators, no call for cool/heat is yet given. Wait one minute after seeing the on indicator and then check the registers. Verify operation of heating or cooling equipment in self-test. Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 985 Douglas Drive North 5 Dynamic Drive Golden Valley, MN 55 oronto, Ontario MV Z9 customer.honeywell.com U.S. Registered rademark 007 Honeywell International Inc. 6-058 J.I. 0-07