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Operation Maintenance Manual OM 751-1
Group: Applied Systems
Part Number: OM 751
Date: November 2006
®
MicroTech II Unit Ventilator Controls
® ®
for AAF -HermanNelson Classroom Unit Ventilators
DX Cooling Only-
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
IMPORTANT
Before unit commissioning, please read this publication in its entirety.
Develop a thoroug
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Cycle Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Acronyms/Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Outdoor Air Damper Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Getting Started . . . . . . . . . . . . . . . . . . . . .
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Introduction Introduction ® ® This manual provides information on the MicroTech II control system used in the AAF - ® HermanNelson 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. For installation, commissioning instructions, and gener
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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) OM 749 Water Source Heat Pump without Electric Heat (Software Model 03) 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) OM 753 DX Coolin
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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 14 and Table 26 on page 47. Table 5: Acronyms and abbreviations Acronym/ Description Abr. Air Fan AF Auxiliary Heat End Differential AHED Auxiliary Heat Start Differential AHSD American Standard Code for Information Interchange ASCII American Society of Heating, Refrigerat
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Introduction Acronym/ Description Abr. Occupied Cooling Setpoint OCS Occupied Heating Setpoint OHS Occupancy Override Input OOI Occupancy Sensor Input OSI Proportional Integral PI Parts Per Million PPM Positive Temperature Coefficient PTC Relative Humidity RH Space Humidity Setpoint RHS Read Only RO Read Write RW Standby Cooling Setpoint SCS Standby Heating Setpoint SHS Thermal Expansion Valve TXV Unoccupied Cooling Setpoint UCS Unoccupied Heating Setpoint UHS Unit Ventilator UV Unit
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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. Note – Many UVC parameters are accessible both through the keypad/display and the network interface. The shared keypad/display and the network interface variables hav
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Getting Started Table 6: Keypad/display security levels Level Display What is restricted? Password 0 U0 Default level (access all) 10 Does not allow set point offset changes; 1 U1 also locks out keypad/display menu 21 access. Does not allow set point offset changes 2 U2 nor MODE key changes; also locks out 32 keypad/display menu access. Does not allow set point offset changes 3 U3 nor MODE and FAN key changes; also 43 locks out keypad/display menu access. Figure 2: Changing keypad/display sec
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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. Figure 3: Viewin
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Getting Started Figure 5: Changing a keypad/display menu item Table 7: Keypad/display menu item list RO 05 Display Keypad menu item list Abr. Description Default 1 RW Reset Alarm Input Enter 1 to clear alarms (clears all inactive alarms, except filter alarm). To enable 2 RW x // rA the alarm again, enter 0. UVC (Heat/Cool) Mode Display current UVC mode. 1 = Heat, 3 = Cool, 4 = Night Purge, 6 = Off, 8 = Emerg. HC UVCM RO x Output Heat, 9 = Fan Only UVC State Output Display current UVC state.
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Getting Started RO 05 Display Keypad menu item list Abr. Description Default 1 RW Exhaust Interlock OAD Adjust OA damper position above which the exhaust fan output will be energized. EOAD RW x 99% o5 Min Position set point There is a fixed –5% differential associated with this set point. Energize Exhaust Fan Adjust OA damper minimum position when the exhaust interlock input is OADE RW x 12% o6 OAD Set point energized. OAD Max Position Set OAMX Adjust OA damper maximum position. RW x 99% o7
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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. This eliminates some of the most common problems associated with control sequences such as the possibility of simultaneous heating and
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Description of Operation Figure 6: Complete UVC—state diagram Off NightPurge 9 8 EmergencyHeat ModeSuperState FullHeat 7 FanOnly A CantHeat D AutoMode HeatMode CoolMode SuperState SuperState Heat Econ DAHeat 5 3 4 CantHeat LowLimit CantCool EconMech LowLimit B E C 1 F Mech 2 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
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Description of Operation Table 8: UVC state names and numbers State numbers Normal UVC modes State names Decimal ASCII Hex OFF OFF 9 9 57 Night purge Night Purge 8 8 56 Fan only Fan Only 10 A 65 Full Heat 7 7 55 Emergency heat Cant Heat 13 D 68 Heat 5 5 53 Heat Cant Heat 11 B 66 Low Limit 14 E 69 EconMech 1 1 49 Auto Mech 2 2 50 Econ 3 3 51 Cool DA Heat 4 4 52 Cant Cool 12 C 67 Low Limit 15 F 70 WARNING Off mode is a “stop” state for the unit ventilator. It is not a “power off” state. Power ma
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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. Therefore,
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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. Emergency Heat mode consists of UVC states: Full Heat [7] and Cant Heat [D]. Software
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Description of Operation 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. Heat Mode (Super State) When in Heat mode, the UVC will use auxiliary heat (if field provided and field connected to the unit) as needed to maintain the eff
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Description of Operation Note – The OAD is considered to be in “alarm” when the OAD is forced below the active minimum position in the Low Limit state. This is not an actual unit “alarm” or “fault” condition, but only a condition used for the purpose of transition arguments. 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 Temperatur
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Description of Operation Figure 12: Cool mode super state diagram Transition Point UVCMode≠Cool AND UVCMode≠Auto OR UVCMode=Auto AND Space=Cold AND MechPI=SatLow(3min) AND EconPI=SatLow UVCMode=Cool OR UVCMode=Auto AND Space=Warm CoolMode SuperState Space=HighCO2 OR DATVCLL Econ = Available HeatPI=SatHi(2min) (3 minutes) AND AND AND DAT
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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. When the Econ Mech state becomes active, the OA damper is set to 100% open, and the UVC uses the units me
