AAF UV05 Operation & Maintenance Manual

Unit ventilator controls for aaf-hermannelson classroom unit ventilators
Table of Contents

Advertisement

MicroTech II
®
for AAF
-HermanNelson
Develop a thorough understanding before starting the commissioning procedure.
This manual is to be used by the commissioner as a guide. Each installation is unique, only general topics are covered.
The order in which topics are covered may not be those required for the actual commissioning.
© 2006 McQuay International
Operation Maintenance Manual
®
Unit Ventilator Controls
®
Classroom Unit Ventilators
Software Model UV05
Used with AAF-HermanNelson Classroom Unit Ventilator
Model AVV - Floor Mounted
Model AHV - Ceiling Mounted
Model AZV, AZU - Floor Mounted Self Contained Air Conditioner
Before unit commissioning, please read this publication in its entirety.
DX Cooling Only-
IMPORTANT
OM 751-1
Group: Applied Systems
Part Number: OM 751
Date: November 2006

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the UV05 and is the answer not in the manual?

Questions and answers

Summary of Contents for AAF UV05

  • Page 1 The order in which topics are covered may not be those required for the actual commissioning. © 2006 McQuay International Operation Maintenance Manual ® Classroom Unit Ventilators DX Cooling Only- Software Model UV05 Model AVV - Floor Mounted Model AHV - Ceiling Mounted IMPORTANT OM 751-1 Group: Applied Systems...
  • Page 2: Table Of Contents

    Introduction....... . 3 Acronyms/Abbreviations ........5 Getting Started .
  • Page 3: Introduction

    Introduction This manual provides information on the MicroTech II HermanNelson 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. For installation, commissioning instructions, and general information on a particular unit ventilator model, refer to the appropriate manual (Table 1), as well as accompanying software operating instruction manual (Table 4), and possible accessory manuals that may pertain to the...
  • Page 4 Introduction Table 4: Software program literature Air Source Heat Pump with Electric Heat (Software Model 00) Water Source Heat Pump with Electric Heat (Software Model 02) Water Source Heat Pump without Electric Heat (Software Model 03) DX Cooling with Electric Heat (Software Model 04) DX Cooling Only (Software Model 05) Electric Heat Only (Software Model 06) DX Cooling with Hydronic Heat - Valve Control (Software Model 07)
  • Page 5: Acronyms/Abbreviations

    14 and Table 26 on page 47. Table 5: Acronyms and abbreviations Air Fan Auxiliary Heat End Differential Auxiliary Heat Start Differential American Standard Code for Information Interchange American Society of Heating, Refrigerating, and Air Conditioning Engineers, Inc Compressorized Cooling Lockout Space CO...
  • Page 6 Introduction Occupied Cooling Setpoint Occupied Heating Setpoint Occupancy Override Input Occupancy Sensor Input Proportional Integral Parts Per Million Positive Temperature Coefficient Relative Humidity Space Humidity Setpoint Read Only Read Write Standby Cooling Setpoint Standby Heating Setpoint Thermal Expansion Valve Unoccupied Cooling Setpoint Unoccupied Heating Setpoint Unit Ventilator Unit Ventilator Controller...
  • Page 7: Getting Started

    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.
  • Page 8 Getting Started Table 6: Keypad/display security levels Figure 2: Changing keypad/display security levels ON/STOP Key and LED Use the ON/STOP key to toggle the UVC between OFF mode and running (Application Mode Input). The ON/STOP LED is off when the UVC is in the OFF mode. Note –...
  • Page 9: Using The Keypad/Display

    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 Figure 3: Viewing indoor air temperature Changing Set Points The keypad/display can be used to make a +/–5°F (+/–3°C) offset adjustment to the effective...
  • Page 10 Getting Started Figure 5: Changing a keypad/display menu item Table 7: Keypad/display menu item list Display Keypad menu item list Abr. Reset Alarm Input UVC (Heat/Cool) Mode UVCM Output UVC State Output UVCS Discharge Air Temp Set DATS Display current DA temperature set point. point Output Discharge Air Temp DAT Display current DA temperature.
  • Page 11 Display Keypad menu item list Abr. Exhaust Interlock OAD EOAD Min Position set point Energize Exhaust Fan OADE OAD Set point OAD Max Position Set OAMX Adjust OA damper maximum position. point OAD Lockout Enable OAD Lockout Set point OALS Economizer Enable Economizer OA Temp Set point...
  • Page 12: Description Of Operation

    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. “State” defines specific states or modes of operation for each process within the unit ventilator (e.g., heating, cooling, etc.) and contain the specific logic for each state.
  • Page 13: Uvc Unit Modes

    Figure 6: Complete UVC—state diagram UVC Unit Modes The UVC provides several “normal” modes of unit operation. These include: Off, Night Purge, Fan Only, Cool, Emergency Heat, Auto, Heat, and Cool. Normal UVC modes can contain a single state or several states depending upon the functionality required for each particular mode.
  • Page 14: Off Mode (State 9)

    Description of Operation Table 8: UVC state names and numbers Off mode is a “stop” state for the unit ventilator. It is not a “power off” state. Power may still be provided to the unit. OFF Mode (State 9) Off mode is provided so that the UVC can be forced into a powered OFF condition. OFF mode is a “stop”...
  • Page 15: Night Purge Mode (State 8)

    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.
  • Page 16: Emergency Heat Mode (Super State)

    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.
  • Page 17: Auto Mode

    Auto Mode Auto mode is provided so that the UVC can be set to automatically determine if heating or cooling is required. Auto mode is the default power-up UVC mode. Auto mode is made up of the Heat and Cool modes. When the UVC is set to auto mode, the UVC automatically determines which mode (Heat or Cool) to use.
  • Page 18: Cool Mode (Super State)

    Description of Operation Note – The OAD is considered to be in “alarm” when the OAD is forced below the active minimum Low Limit State (State E) The Low Limit state is a “non-normal” state the UVC can go into while Heat mode is active when the unit reaches 100% heating and still cannot meet the current DATS (see “Discharge Air Temperature Control”...
  • Page 19 Figure 12: Cool mode super state diagram Transition Point UVCMode UVCMode=Auto AND Space=Cold AND MechPI=SatLow(3min) AND UVCMode=Cool UVCMode=Auto AND Space=Warm Econ State (State 3) The Econ state is a “normal” state during Cool mode. The Econ state typically is active in the Cool mode when primary cooling (economizer) is available and adequate to meet the cooling requirements.
  • Page 20 Description of Operation Figure 13: Econ state operation (occupied mode and auto fan) Econ Mech State (State 1) The Econ Mech state is a “normal” state during Cool mode. The Econ Mech state typically is active in the Cool mode when primary cooling (economizer) alone is not adequate to meet the cooling requirements and both primary cooling and secondary cooling (compressor) are available.
  • Page 21: Special Purpose Unit Modes

    The CO Controlled Ventilation (optional)” on page 34), and the OA damper is adjusted as needed to maintain the CO Figure 15: Mech state operation (occupied mode and auto fan) Discharge Air (DA) Heat State (State 4) The DA Heat state is a “normal” state during Cool mode. The DA Heat state typically is active when reheat is required to maintain DATS while maintaining the required OA damper position.
  • Page 22: Purge Mode

    Description of Operation In each of these special purpose UVC modes, if the space temperature drops below EHS and the Emergency Heat function is enabled, the UVC is forced into the Emergency Heat mode (see “Emergency Heat Mode (Super State)” on page 16) and then return once the Emergency Heat function is satisfied.
  • Page 23: Unit Mode Priority

    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.
  • Page 24: Occupancy Modes

    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.
  • Page 25: Bypass Mode

    Bypass Mode The bypass mode (also called Tenant Override) is the equivalent of a temporary occupied mode. Once the bypass mode is initiated, it remains in effect for a set period of time (120 minutes, default). During the bypass mode, the UVC uses the occupied heating and cooling set points, the OAD operates normally, and by default the IAF remains on.
  • Page 26: Space Temperature Set Points

    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.
  • Page 27: Remote Wall-Mounted Sensor With +/-3°F Adjustment (Optional)

    Remote Wall-Mounted Sensor with +/–3°F Adjustment (optional) When the optional remote wall-mounted sensor with +/–3°F adjustment dial is used, the UVC effectively writes the value of the set point adjustment dial to the Set Point Offset Input variable. Note – If a network connection is used to adjust the Set Point Offset Input variable, you must not 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...
  • Page 28 Description of Operation Figure 16: Effective set point calculations Table 15: Set point calculation examples Occupancy Temperature Setpoints (network configuration variables) Occupied Cooling Set Point (OCS) Standby Cooling Set Point (SCS) Unoccupied Cooling Set Point (UCS) Occupied Heating Set Point (OHS) Standby Heating Set Point (SHS) Unoccupied Heating Set Point (UHS) Space Temp...
  • Page 29: Proportional Integral (Pi) Control Loops

    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. Table 16: PI loop list PI loops PI loop type...
  • Page 30: Pi Control Parameters

    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 20). If field problems arise, first ensure these parameters are set back to the factory default settings.
  • Page 31: Integral Time

    Description of Operation In general, it is best to start with a relatively large proportional band setting (the factory default setting is best) and adjust to smaller values. If you want the system to respond strongly to small changes in the space, adjust the proportional band to a higher setting.
  • Page 32: Unoccupied Operation

    Description of Operation Unoccupied Operation During unoccupied mode, the IA fan typically remains off and cycles with calls for heating and cooling. Cycle Fan The UVC is provided with a Fan Cycling Configuration variable that can be used to force the IA fan to cycle with calls for heating and cooling during the occupied, standby, and bypass occupancy modes.
  • Page 33 • Expanded (optional)—Temperature Comparison with OA Enthalpy Setpoint Economizer • Leading Edge (optional)—Temperature Comparison with Enthalpy Comparison Economizer Temperature Comparison Economizer (default) If the default Basic economizer function is selected, the unit ventilator is provided from the factory without the optional IA and OA humidity sensors. In this case, the UVC is factory set for Economizer Strategy 1—the UVC automatically detects that no OA humidity sensor is present and adjusts to use the Temperature Comparison Economizer function.
  • Page 34: Networked Space Humidity Sensor Capability

    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.
  • Page 35: Ashrae Cycle Ii

    Description of Operation ASHRAE Cycle II The UVC supports ASHRAE Cycle II operation. The basis of ASHRAE Cycle II is to maintain the required minimum amount of ventilation whenever possible, which can be increased during normal operation for economizer cooling or CO DCV control or reduced to prevent excessively cold discharge air temperatures.
  • Page 36: Compressor Minimum On And Off Timers

    Description of Operation Compressor Minimum On and Off Timers The UVC is provided with minimum On (3-minute default) and minimum Off (5-minute default) timers to prevent adverse compressor cycling. Compressor Start Delay The UVC is provided with a Compressor Start Delay configuration variable, which is intended to be adjusted as part of the start-up procedure for each unit.
  • Page 37: External Binary Inputs

    External Binary Inputs The UVC is provided with three binary inputs that provide the functions described below. Figure 24: Binary inputs Input 1: Unoccupied (default) Input 2: Remote shutdown Input 3: Ventilation lockout (default) These inputs each allow a single set of dry contacts to be used as a signal to the UVC. Multiple units can be connected to a single set of dry contacts.
  • Page 38: External Binary Outputs

    Description of Operation Exhaust Interlock Input Signal This input allows a single set of dry contacts to be used to signal the UVC that an exhaust fan within the space is energized. The UVC repositions the OA damper to a user adjustable minimum position (Exhaust Interlock OA Damper Min Position Setpoint).
  • Page 39 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). When the OA damper closes below this set point, the relay output signals the exhaust fan OFF (contacts open).
  • Page 40: Uvc Input And Output Table

    UVC Input and Output Table UVC Input and Output Table All UVC input and output connections and their corresponding unit ventilator usage are shown in the following table. Table 21: Inputs and outputs, software model 05—DX cooling only 1. Field selectable external output options (all possible options are shown). 2.
  • Page 41: Diagnostics And Service

    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: Alarm and Fault Monitoring The UVC is programmed to monitor the unit for specific alarm conditions. If an alarm condition exists, a fault occurs.
  • Page 42: Space Temp Sensor Failure (F0)

    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. •...
  • Page 43: Condensate Overflow Indication (Optional) (F4)

    Diagnostics and Service Condensate Overflow Indication (optional) (F4) The Condensate Overflow Indication fault will occur when the UVC detects high condensate levels within the units indoor coil drain pan. Effect: • Compressor is immediately de-energized if in cooling. • Outdoor fan (if present) is de-energized. •...
  • Page 44: Space Humidity Sensor Failure (Optional) (Fa)

    Diagnostics and Service Space Humidity Sensor Failure (optional) (FA) The Space Humidity Sensor Failure fault occurs when the UVC detects open or short conditions from the sensor. Effect: • IA/OA Enthalpy comparison economizer (if used) is disabled. • Dehumidification function (optional) is disabled. •...
  • Page 45: Troubleshooting Humidity Sensors

    Table 23: Temperature versus resistance 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. The humidity sensor is not protected against reversed polarity. Check carefully when connecting the device or damage can result.
  • Page 46: Troubleshooting Carbon Dioxide (Co ) Sensors

    Diagnostics and Service Table 24: Humidity versus voltage. Troubleshooting Carbon Dioxide (CO 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. In the unlikely event that the CO information on obtaining calibration equipment and instructions.
  • Page 47: Uvc Configuration Parameters

    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.
  • Page 48 UVC Configuration Parameters Configuration Parameter Name Abr. Primary Cool Proportional Band Primary Cool Integral Time Secondary Cool Proportional Band Secondary Cool Integral Time Discharge Air Temp Proportional Band Discharge Air Temp Integral Time Proportional Band Integral Time Ventilation Cooling Low Limit Setpoint VCLL discharge air low limit during ventilation or economizer cooling Mechanical Cooling Low Limit Setpoint MCLL discharge air low limit during mechanical (compressor) cooling Discharge Air High Limit...
  • Page 49 Configuration Parameter Name Abr. OAD Stroke Time Split-System OA/DX Coil Temp Application Name and Version Label Compressor Start Delay Outdoor Fan Delay 1. Indicates parameters accessible through the keypad/display. 2. Requires optional equipment. McQuay OM 751 Notes used on split-system units only to partially disable the compressor envelope by setting the outside DX coil temperature to a fixed valid value, enter 122°F (50°C) on split-systems, use 327.67 for self- contained units (327.67 = invalid)
  • Page 50 McQuay Training and Development Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.

This manual is also suitable for:

Microtech ii uv05

Table of Contents

Save PDF