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351579-YTS-B-06089. Modulating Gas Heat Option: The modulating gas heatoption uses a slave control, “MFC” Modulating FurnaceControl, that receives the heat calls from the UCB and thencontrols up to 17 Steps of gas heat in a similar manner.10. Electric Heat Option: The Millennium ® Simplicity ® controlallows staging electric heat. On units with the Electric HeatOption, a call for heat (W1) will initiate the main supply fan.When the Simplicity ® control is satisfied by the APS, it willcomplete the circuit to the first stage of electric heat by energizingterminal H1. If additional heat is required, H2 will energizethe second stage of electric heat [if the unit is soequipped], and H3 the third stage [if the unit is so equipped].Disconnect all power supplies before checking orservicing the electric heat section.All electric heat modules have an auto-reset primary limit,monitored by the control, and non-restartable back-up limits.Dirty filters, broken belts, fan motor burn-out or runningthis unit below 6,000 CFM will cause the limit to trip on theauto-reset primary limit. In addition to the primary limit,back-up limits may trip under these conditions. The backuplimits are one-trip devices and will have to be replacedshould they trip.When a call for heat has been satisfied, the highest stagerunning will be de-energized until all are de-energized.11. Hot Water Heat Option: The unit will send a 2-10 VDC signalto drive a hot water valve.12. Economizer Option: The control directly controls the positionof the outside air / return air dampers through a 2-10VDC signal from terminal ECO to ACT1 (economizer actuator).The economizer is enabled only in Occupied or Recoverymode, and after supply fan operation has been verified(APS closed). When the supply fan is powered and there isno Y1 call or if free cooling is unavailable, the control opensthe economizer dampers to the minimum position setting.The actuator maximum opening speed is 150 seconds tofull open; the control moves the actuator at the rate of twoseconds for each one % it is opening, so full open fromclosed would take 200 seconds. At entry to Occupiedmode, the economizer is typically opening from 0 to a minimumsetting of 20%, which would take about 40 seconds.In Unoccupied mode, the economizer will close to 0%.With a Y1 call when the outside air is appropriate for freecooling (see below), free cooling is used for first stage cooling.The control modulates the economizer dampers tomaintain a SAT setpoint plus or minus one degree.The control uses one of three methods to determine whenfree cooling is available. The method used is determinedby the unit options, which function as listed below.Dry Bulb: The control relies on the RAT, OAT, and SATreadings, connected to those terminals on the control.Free cooling will be available until the outdoor temperaturerises above the indicated temperature range. Freecooling is disabled when the outdoor temperature risesabove the temperature range and cannot be enableduntil the outdoor temperature falls below the indicatedtemperature range.Single Enthalpy: The Outdoor Air Humidity Sensor isconnected to terminal OAH. When the outdoor enthalpyis below the setpoint, free cooling is available.Dual Enthalpy (Comparative/Differential Enthalpy):Both the Outdoor Air Humidity [OAH] and the Return AirHumidity [RAH] sensors are connected to the control.When the outdoor air enthalpy is less than the return airenthalpy, free cooling is available. The control will disablefree cooling and force mechanical cooling when theoutside air temperature exceeds setpoints.13. Power Exhaust Option with Modulating Dampers: Thepower exhaust controls are enabled in Occupied or Recoverymode when the APS is satisfied. The building pressureis sampled by a tube provided and installed by the customerat a location in the building, connected to the highpressure port of the pressure transducer BPS. BPS providesa 0-5 VDC signal to the control, which compares thereading to the pressure setpoint to control the exhaustdampers. The exhaust damper vanes are modulated byACT2, from a signal from terminal EXD+. The exhaustmotor is energized by voltage at terminal EXH to contactor10M when the dampers are driven above the ON setpointfor damper open %.The exhaust motor is powered OFF when the vanes reachthe OFF % point set in control parameters. When the powerexhaust is disabled, ACT2's spring return closes the exhaustdampers and 10M opens to shut down the exhaust fans.14. Power Exhaust Option with Variable Frequency Drive:The power exhaust controls are powered through EXH /10M with a call for the supply fan. Once powered, the BPSsensor (Building Pressure sensor) sends a signal to terminal53 of the VFD. The damper vanes are gravity-closed;motor speed is continuously variable. See separate documentfor details on power exhaust VFD operation.15. Non-modulating Power Exhaust Option: The powerexhaust motor is energized by EXH / 10M based on theposition of the Economizer damper settings in the controlparameters. Minimum run time is 10 seconds; minimum offtime is 60 seconds. The outlet pressure of the powerexhaust fan forces the barometric relief dampers open;gravity closes the dampers when the exhaust fan is off.VARIABLE AIR VOLUME UNIT (VFD & IGV)OVERVIEWThe VAV units operate in one of three modes: Occupied,Unoccupied, and Recovery. The unit operational mode is20 Johnson Controls Unitary Products
351579-YTS-B-0608determined by the status of the internal clock and the internalschedules.OCCUPIED / UNOCCUPIED / MORNING WARM-UPOCCUPIEDIn Occupied mode, all installed options enabled by theparameter settings are available. The supply fan is operated[controlled to the duct pressure setpoint if a VAV], optional unitheating is available at full capacity, the optional power exhaustsystem is enabled, the economizer outside air dampers go totheir minimum position or open for free cooling. This operationcontinues until the unit enters Unoccupied mode. When thecontrol sees an Occupied override button push from thethermostat or space sensor, it will go to Occupied mode for thelength of time set in the parameters, up to four hours. If the unitis in Space Sensor operation, the fan will operate at full speed[controlled to the duct pressure setpoint if a VAV].A VAV standalone unit will run MWUP the first hour of the OCCoverride signal, then go to Occupied. The supply fan will runcontinuously.UNOCCUPIEDIn Unoccupied mode, the economizer goes to full closed; thesupply fan will only operate if there is a call for heating orcooling [controlled to the duct pressure setpoint if a VAV]. Ifheating is required, all installed stages will be energized.The bypass VFD is a standard Variable FrequencyDrive packaged with a further set of contactors Whenbypass mode is activated, contactors route poweraround the VFD, connecting the indoor fan motordirect to supply voltage. At this point the motor will goto full RPM regardless of the duct pressure signal,because the VFD is out of the loop, and there is apotential for over pressuring the ducts.The air balancer must set maximum duct static / CFMto stay within a static pressure that the ductwork of thatinstallation can tolerate when the motor is at full RPM,considering that the VAV boxes, if they are part of thesystem, may not be full open.If the duct system includes VAV boxes, they must bedriven open in Bypass mode in the same manner asgoing to heat mode. The drive indicates being in “bypass”mode with normally open contacts wired to terminal block1, position 5 and 6 across Danfoss relay M3 [refer todrawings supplied by Danfoss, packed with the unit].Voltage sufficient to signal the boxes to open must bewired through this contact. This is a field-installconnection.MORNING WARM-UP [MWUP]The unit enters a morning warm-up mode going in to the firstOccupied period of the control’s internal daily schedule. In thismode, the supply fan is operated at full volume, optional unitheating is engaged at full capacity if needed, the optional powerexhaust system is enabled, the economizer outside air dampersclose (return air dampers open), cooling is disabled, andvoltage is provided at H1 to signal the remote VAV boxes toopen. This operation continues until the return air temperatureexceeds the adjustable setpoint of the Morning Warm-up bulbthermostat (MWUP).The parameter for MWUP must be turned on. Without Intelli-Start, MWUP will start one hour ahead of Occupied. Cooling willnot start until the Occupied mode starts. In MWUP, the controlwill operate the fan and energize heat after monitoring RAT fiveminutes after going into MWUP, or if RAT goes two degreesbelow the MWUP setpoint.UNIT CONTROLS1. The control reviews parameters, the unit clock, and occupied /Holiday schedules to select the appropriate mode. In Occupiedmode, the unit will look at inputs enabled by parametersettings. It will default to secondary inputs if necessary.When the unit is running in Occupied mode, the duct pressurecontroller, if that option is installed, is activated; theoptional power exhaust system is activated, power isapplied to the airflow proving switch (APS), and to the supplyfan motor contactor (5M) to engage the supply fan. Ifthe supply fan operates correctly (proper rotation) the pressuredifference between the supply fan section and theheating section increases and APS closes to enable operation.The control waits 90 seconds for the fan to reach equilibrium,then looks at the APS.For units without optional head pressure control: If the outsideair temperature rises above 50 °F the control enablesall mechanical cooling stages. If the outside air temperaturefalls below 40 °F, then all mechanical cooling stagesare locked out.For units with head pressure control: Enable third andfourth (40 Ton only) stage mechanical cooling when theambient temperature rises above 50 °F. If the outside airtemperature falls below 40 °F, mechanical cooling stages 3and 4 (40 Ton only (all R410a)) are locked out. Enable firstand second stage mechanical cooling when the ambienttemperature rises above 10 °F. If the outside air temperaturefalls below 0 °F, all mechanical cooling stages arelocked out.2. While the return air temperature remains below the setpointof MWUP (Morning Warm-up), engage the unit heat(optional) at full capacity.For Inlet Guide Vane VAV: terminal VFD provides a 10VDCsignal for the actuator, thus forcing the inlet guide vanedampers to fully open during the warm-up cycle. TerminalH1, heat stage 1, is used to signal the remote VAV boxes toopen. In this warm-up mode, VAV and the economizerJohnson Controls Unitary Products 21
Page 1 and 2: 351579-YTS-B-0608TECHNICAL APPLICAT
Page 3 and 4: 351579-YTS-B-0608THE MILLENNIUM ®
Page 5 and 6: 351579-YTS-B-0608EPROM - This is
Page 7 and 8: 351579-YTS-B-0608ANALOG INPUTS (AI)
Page 9 and 10: 351579-YTS-B-0608Table 3: Simplicit
Page 11 and 12: 351579-YTS-B-0608SIMPLICITY ® PROG
Page 13 and 14: 351579-YTS-B-0608be turned off by t
Page 15 and 16: 351579-YTS-B-0608Once the Unoccupie
Page 17 and 18: 351579-YTS-B-0608Table 5: Settable
Page 19: 351579-YTS-B-06082. Mechanical cool
Page 23 and 24: 351579-YTS-B-0608Pressure Switch -
Page 25 and 26: 351579-YTS-B-0608Table 9: Modulatin
Page 27 and 28: 351579-YTS-B-0608As the ambient tem
Page 29 and 30: 351579-YTS-B-0608mizer damper and u
Page 31 and 32: 351579-YTS-B-0608TYPES OF SPACE SEN
Page 33 and 34: 351579-YTS-B-0608UNOCCUPIED HEATING
Page 35 and 36: 351579-YTS-B-0608Table 12: Holiday
Page 37 and 38: 351579-YTS-B-0608The RAH sensor, if
Page 39 and 40: 351579-YTS-B-0608for economizer loa
Page 41 and 42: 351579-YTS-B-0608time 60 seconds (N
Page 43 and 44: 351579-YTS-B-0608TROUBLESHOOTING A

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