Operation and Maintenance Manual OM 751-4 Group: Unit Ventilator Document PN: 106506346 Date: July 2014 MicroTech® II Controls for Daikin Classroom Unit Ventilators DX Cooling Only Software Model UV05 Used with Daikin Classroom Unit Ventilator Model AVV - Floor-Mounted Model AHV - Ceiling-Mounted Model AZU - Floor-Mounted Self-Contained Air Conditioner IMPORTANT Before unit commissioning, please read this publication in its entirety.
Contents Introduction...........................................................................4 Acronyms/Abbreviations ...................................................6 Outdoor Air Damper Operation.........................................31 Minimum Position............................................................31 Economizer Operation.....................................................31 Networked Space Humidity Sensor Capability ...............33 Networked Outdoor Humidity Sensor Capability ....
Introduction This manual provides information on the MicroTechI® II control system used in the Daikin Applied Unit Ventilator product line. It describes the MicroTech II components, input/ output configurations, field wiring options and requirements, and service procedures. For installation and general information on the MicroTech II Unit Ventilator Controller, refer to IM 747, MicroTech II Unit Ventilator Controller.
Introduction Table 4: Software program literature Description Manual # Air Source Heat Pump with Electric Heat (Software Model 00) OM 748 Water Source Heat Pump with Electric Heat (Software Model 02) Water Source Heat Pump without Electric Heat (Software Model 03) OM 749 DX Cooling with Electric Heat (Software Model 04) OM 750 DX Cooling Only (Software Model 05) OM 751 Electric Heat Only (Software Model 06) OM 752 DX Cooling with Hydronic Heat - Valve Control (Software Model 07) DX Cooling with
Introduction Acronyms/Abbreviations The following table list acronyms and abbreviations that may or may not be used within this manual. Other abbreviations for keypad displays and parameters can be found in Table 8 on page 15 and Table 26 on page 46. Table 5: Acronyms and abbreviations Description OM 751-4 Acronym/Abr.
Introduction www.DaikinApplied.com Description Acronym/Abr.
Getting Started The MicroTech II Unit Vent Controller (UVC) is a self-contained device that is capable of complete, stand-alone operation. Information in the controller can be displayed and modified by using the keypad/display (local user interface). The following sections describe how to use the keypad/display. Note: Many UVC parameters are accessible both through the keypad/display and the network interface.
Getting Started Table 6: Keypad/display security levels Level Display What is restricted? Password 0 uo Default level (access all) 10 1 u1 Does not allow set point offset changes; also locks out keypad/display menu access. 21 2 u2 Does not allow set point offset changes nor MODE key changes; also locks out keypad/display menu access 32 3 u3 Does not allow set point offset changes nor MODE and FAN key changes; also locks out keypad/display menu access.
Getting Started Using the Keypad/Display Viewing Actual Indoor Air Temperature (IAT) Normally, the effective set point temperature appears on the keypad/display. You also can use the keypad/display to view the indoor air temperature (IAT). See Figure 3. Note: When the actual indoor air temperature (Effective Space Temp Output) equals the effective set point temperature (Effective Set Point Output), you there is no change to the keypad/display when you view space temperature.
Getting Started Figure 5: Changing a keypad/display menu item Table 7: Keypad/display menu item list Display Keypad menu item list Abr. Description 05 RW x Default 2 ra Reset Alarm Input hc UVC (Heat/Cool) Mode Output UVCM Display current UVC mode. 1 = Heat, 3 = Cool, 4 = Night Purge, 6 = Off, 8 = Emerg. Heat, 9 = Fan Only RO x st UVC State Output Display current UVC state.
Getting Started Keypad menu item list Display Abr. Description RO RW1 05 Default x5 Exhaust Interlock OAD Adjust OA damper position above which the exhaust fan output will be energized. There is a fixed –5% EOAD Min Position set point differential associated with this set point. RW x 99% x6 Energize Exhaust Fan OADE Adjust OA damper minimum position when the exhaust interlock input is energized. OAD Set point RW x 12% x7 OAD Max Position Set OAMX Adjust OA damper maximum position.
Description of Operation Description of Operation State Programming The MicroTech II UVC takes advantage of “state” machine programming to define and control unit ventilator operation. A “State” defines a specific mode of operation for each process within the unit ventilator (e.g., heating, cooling, etc.) and contains the specific decision logic and sequence of operation for each mode.
Description of Operation Figure 6: Complete UVC—state diagram OFF Mode (State 9) EMERGENCY HEAT Auxiliary Mode Heat may be FAN ONLY Mode (State 10) LUI Input Network Input used if available NIGHT PURGE Mode (State 8) AUTO Mode COOL Mode HEAT Mode Auxiliary Heat may be used if available ECON Mode (State 3) CANT COOL Mode (State 12) ECON MECH Mode (State 1) Manual/Forced Transition One-way Automatic Transition Two-way Automatic Transition MECH COOL Mode (State 2) UVC Unit Modes The UVC provide
Description of Operation Table 8: UVC state names and numbers Normal UVC modes State names OFF State numbers Decimal ASCII Hex OFF 9 9 57 Night purge Night Purge 8 8 56 Fan only Fan Only 10 A 65 Emergency heat See Note 1 Heat Auto See Note 1 Cool EconMech 1 1 49 Mech 2 2 50 Econ 3 3 51 Cant Cool 12 C 67 Note: 1. Auxiliary heat only, if available. WARNING Off mode is a “stop” state for the unit ventilator. It is not a “power off” state.
Description of Operation Night Purge Mode (State 8) Night Purge mode is provided as a means to more easily and quickly ventilate a space. Night purge can be useful in helping to remove odor build up at the end of each day, or after cleaning, painting, or other odor generating operations occur within the space. Night Purge mode consists of a single UVC state: Night Purge [8]. Night Purge is a full ventilation with exhaust mode, during which room comfort is likely to be compromised.
Description of Operation Emergency Heat Mode (Super State) The Emergency Heat mode is provided for situations where the UVC is in a mode that does not normally allow heating, such as OFF, Cool, Night Purge, or Fan Only. If Emergency Heat mode is enabled, the UVC can automatically force itself into the Emergency Heat mode from OFF, Cool, Night Purge, Fan Only, Purge, Pressurize, De-pressurize, and Shutdown. Units with software model 05 do not have primary or secondary heating devices.
Description of Operation Cool Mode (Super State) When in Cool mode the UVC uses primary cooling (economizer) and secondary cooling (mechanical, DX) as needed to maintain the effective cooling set point (see "Space Temperature Set Points" on page 25). The keypad/display or network connection can be used to force the unit into the Cool mode. When the UVC is in Auto mode, it is “normal” for the UVC to “idle” in Cool mode when there is no need to switch to another mode.
Description of Operation The UVC monitors the DAT to ensure it does not fall below VCLL. The CO2 demand controlled ventilation function (optional) will be active (see "CO2 Demand Controlled Ventilation (optional)" on page 33) and the OA damper is adjusted as needed to maintain the CO2 set point. Figure 11: Econ state operation (occupied mode and auto fan) Econ Mech State (State 1) The Econ Mech state is a “normal” state during Cool mode.
Description of Operation Mech State (State 2) The Mech state is a “normal” state during Cool mode. The Mech state typically is active in the Cool mode when primary cooling (economizer) is not available and secondary cooling (compressor) is available. When the Mech state becomes active, the UVC will (within State) continually calculate the DATS (“Discharge Air Temperature Control” on page 31) required to maintain the effective cooling set point (see "Space Temperature Set Points" on page 29).
Description of Operation Special Purpose Unit Modes There are some additional UVC modes that are considered special purpose unit modes. These special purpose modes include Pressurize, Depressurize, Purge, Shutdown, and Energy Hold Off. These modes force the UVC to perform very specific and limited functions. Use these with caution and only for short periods as needed.
Description of Operation Unit Mode Priority The UVC uses the network variables and binary inputs listed in Table 10 and Table 11 to determine the current unit mode. Special purpose UVC unit modes have higher priority than the normal UVC unit modes as shown in the tables. Each table lists the highest priority items on the left to the lower priority items to the right. The right-most columns indicate unit operation as a result of the left-most columns.
Description of Operation Occupancy Modes The UVC is provided with four occupancy modes: Occupied, Standby, Unoccupied, and Bypass. The occupancy mode affects which heating and cooling temperature set points are used, affects IAF operation, and affects OAD operation. The Manual Adjust Occupancy and Networked Occupancy Sensor network variables, along with the Unoccupied and Tenant Override binary inputs, are used to determine the Effective Occupancy.
Description of Operation Additional Occupancy Features Networked Occupancy Sensor Capability A networked occupancy sensor can be interfaced with the Occupancy Sensor Input variable to select occupancy modes. When the Occupancy Sensor Input variable is used, it automatically overrides any hard-wired unoccupied binary input signal. Unit-Mounted Time-Clock An optional unit-mounted factory-installed electronic 24-hour/7-day time clock can be provided on stand-alone unit ventilator configurations.
Description of Operation Space Temperature Set Points The UVC uses the six occupancy-based temperature set points as the basis to determine the Effective Set point Output. The effective set point is calculated based on the unit mode, the occupancy mode, and the values of several network variables. The effective set point then is used as the temperature set point that the UVC maintains.
Description of Operation Remote Wall-Mounted Sensor with 55°F to 85°F Adjustment (optional) When the optional remote wall-mounted sensor with 55°F to 85°F adjustment dial is used, the UVC will effectively write the value of the set point dial to the Space Temp Set Point Input variable. Note: If a network connection is using the Space Temp Set Point Input variable, do not use the optional remote wall-mounted sensor with 55°F to 85°F adjustment.
Description of Operation Table 15: Setpoint calculation examples Example A – Stand-Alone Unit, No remote sensor, No network communication Given Occupancy Mode = Occupied and Unit Mode = Heat Space Temp Setpoint = (not used) Setpoint Offset = (from LUI) = 0.0°F Setpoint Shift = (not used) = 0.0°F OHS = 69.8°F Effective set point calculations Effective Setpoint = OHS + AbsOffset + Setpoint Offset + Setpoint Shift = 69.8°F + 0.0°F + 0.0°F + 0.0°F = 69.
Description of Operation Proportional Integral (PI) Control Loops The MicroTech II UVC uses PI-loop control for heating, cooling and ventilation processes within the unit ventilator. Numerous PI algorithms can be used depending upon the unit ventilator configuration. The UVC uses “single” and “cascading” PI loops where needed.
Description of Operation PI Control Parameters Associated with each PI loop is a set of two adjustable parameters: Proportional Band and Integral Time. When the unit ventilator is properly sized for the space, the factory settings for these parameters provides the best and most robust control action (see Figure 18). If field problems arise, first ensure these parameters are set back to the factory default settings. If adjustment is required, only make small adjustments to one parameter at a time.
Description of Operation Integral Time The integral time, or integral action, causes the controlled output to change in proportion to time difference between the sensor value and set point. The difference over time between the actual value and set point forms an “area under the curve” (see Figure 20). The integral action works to reduce this “area under the curve” and to eliminate any natural system offset.
Description of Operation Indoor Air Fan interlock with Compressor Operation The IA fan will turn on with compressor operation if configured for fan cycling. When the compressor turns off, if the indoor air coil DX temperature is less than 50°F (10°C), then the IA fan will remain on at the current user or auto fan speed selection. When the indoor air coil DX temperature becomes greater than 50°F (10°C) the IA fan will be allowed to turn off.
Description of Operation Temperature Comparison with OA Enthalpy Setpoint Economizer (optional) If the optional Expanded economizer function is selected, the unit ventilator is provided from the factory with the optional OA humidity sensor, which is used along with the OA temperature sensor to calculate OA enthalpy. In this case, the UVC is factory set for the Expanded Economizer Strategy and uses the Temperature Comparison with OA Enthalpy Setpoint Economizer function.
Description of Operation Networked Space Humidity Sensor Capability A networked space humidity sensor can be network interfaced with the Space Humidity Input variable. When the Space Humidity Input variable is used (valid value), it automatically overrides the hard-wired space humidity sensor (if present). Networked Outdoor Humidity Sensor Capability A networked outdoor humidity sensor can be network interfaced with the Outdoor Humidity Input variable.
Description of Operation Compressor Operation The UVC is configured to operate the compressor as secondary (mechanical) cooling when the economizer is available. When the economizer is not available and the compressor is available, the UVC uses the compressor when cooling is required.
Description of Operation Floating-Point Actuator Auto-Zero, Overdrive and Sync For self-contained units, the UVC at power-up auto-zeros all floating-point actuators (OA damper) before going into normal operation to ensure proper positioning. During auto-zero, the unit remains off. The actuators all open approximately 30% and then are driven full closed. The overdrive feature then is used to continue forcing the actuators closed for one full stroke period.
Description of Operation External Binary Input 3 This input can be configured as a ventilation lockout (default) or exhaust interlock signal. Ventilation Lockout Input Signal This input allows a single set of dry contacts to be used to signal the UVC to close the OA damper. When the contacts close (ventilation lockout signal), the UVC closes the OA damper. When the contacts open, the UVC returns to normal OA damper operation.
Description of Operation External Binary Output 3 This output can only be used to signal exhaust fan operation (default) or operate an auxiliary heat device. Exhaust Fan ON/OFF Signal This relay output provides one set of Normally Open dry contacts that can be used to signal the operation of an exhaust fan. When the OA damper opens more than the Energize Exhaust Fan OA Damper set point, then the relay output signals the exhaust fan ON (contacts closed).
UVC Input and Output Table All UVC input and output connections and their corresponding unit ventilator usage are shown in the following table.
Diagnostics and Service The most important aspect of troubleshooting unit ventilator controls is to isolate the source of the problem into one of two categories: 1. The problem resides within the UVC. 2. The problem is external to the UVC. Under most circumstances the problem is external to the UVC. Alarm and Fault Monitoring The UVC is programmed to monitor the unit for specific alarm conditions. If an alarm condition exists, a fault occurs.
Diagnostics and Service Space Temp Sensor Failure (f0) The Space Temp Sensor Failure fault occurs when the UVC detects open or short conditions from the sensor. Effect: • Space fan de-energizes (unless in emergency heat mode). • Compressor immediately de-energizes. • Outdoor fan (if present) de-energizes. • Outside air damper is forced closed. • Electric heat stages are de-energized. • Fault is indicated.
Diagnostics and Service Space Coil DX Temp Sensor Failure (f5) The Space Coil DX Temp Sensor Failure fault occurs when the UVC detects open or short conditions from the sensor. Effect: • Compressor immediately de-energizes. • Outdoor fan (if present) de-energizes. • Fault is indicated. Outdoor Temp Sensor Failure (f6) The Outdoor Temp Sensor Failure fault occurs when the UVC detects open or short conditions from the sensor. Effect: • Outside air damper is forced closed.
Diagnostics and Service Space CO2 Sensor Failure (optional) (fc) The Space CO2 Sensor Failure fault occurs when the UVC detects open or short conditions from the sensor. Effect: • CO2 Demand Controlled Ventilation function is disabled. • Fault is indicated. Change Filter Indication (ff) The Change Filter Indication fault occurs when the UVC calculates that the total fan run time has exceeded the allowed number of hours since the last filter change. Effect: • Fault is indicated.
Troubleshooting Temperature Sensors The UVC is configured to use passive positive temperature coefficient (PTC) sensor whose resistance increases with increasing temperature. The element has a reference resistance of 1035 ohms at 77°F (25°C). Each element is calibrated according to the tables shown. Use the following procedure to troubleshoot a suspect sensor. 1. Disconnect both sensor leads from the UVC. 2.
Diagnostics and Service Troubleshooting Humidity Sensors The UVC is configured to use a 0–100% RH, 0–5 VDC, capacitive humidity sensor. Each sensor is calibrated according to the table shown. CAUTION The humidity sensor is not protected against reversed polarity. Check carefully when connecting the device or damage can result. Use the following procedure to troubleshoot a suspect sensor: 1. Disconnect the sensors output voltage lead from the UVC analog input. 2.
Diagnostics and Service Troubleshooting Carbon Dioxide (CO2) Sensors The UVC is configured to use a 0–2000 PPM, 0–10 VDC, single beam absorption infrared gas sensor. Each sensor is calibrated according to the table shown. Use the following procedure to troubleshoot a suspect sensor. 1. Disconnect the sensors output voltage lead from the UVC analog input (xAI-3). 2. Using some other calibrated CO2 sensing device, take a CO2 reading at the sensor location. 3.
Diagnostics and Service UVC Configuration Parameters The UVC is been provided with a number of configuration variables as listed in the following table. These configuration variables are stored in UVC non-volatile memory. For a description of supported network variables for each protocol, refer to Protocol Data Packet bulletin ED 15065. Table 26: UVC configuration parameters (OM 751) Configuration parameter name Abr.
Diagnostics and Service Configuration parameter name Abr. Notes Primary Cool Proportional Band 18°F (10°C) Primary Cool Integral Time 180 sec Secondary Cool Proportional Band 18°F (10°C) Secondary Cool Integral Time 600 sec Discharge Air Temp Proportional Band 4°F (2.
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