American Standard UV05 manual

© 2006 McQuay International DX Cooling Only- Sof tware Model UV05 Used with AAF-HermanNelson Classroom Unit V entilator Model A VV - Floor Mounted Model AHV - Ceiling Mounted Model AZV , AZU - Floor Mounted Self Cont ained Air Conditioner MicroT ech II ® Unit V entilator Controls for AAF ® -HermanNelson ® Classroom Unit V entilators Operation M[...]

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Acronyms/Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Display Fo[...]

McQuay OM 751 3 Introd uction Introduction This manual provides information on the MicroT ech II ® control system used in the AAF ® - HermanNelson ® Unit V entilator product line. It describes the MicroT ech II components, input/ output configurations, fi eld wiring options and requirements, and service procedures. For installation and general i[...]

4 McQuay OM 751 Introduction T able 4: Software program literature Description Manual # Air Source Heat Pump with Electric Heat (Software Mode l 00) OM 748 W ater Source Heat Pump with Electric Heat (So ftware Model 02) W ater Source Heat Pump withou t Electric Heat (Software Mode l 03) OM 749 DX Cooling with Electric Heat (Softwar e Model 04) OM 7[...]

McQuay OM 751 5 Introd uction Acronyms/Abbreviations The following table list acronyms and abbrev iations that may or may not be used within this manual. Other abbreviations for keypad displays and parameters can be found in T able 8 on page 14 and T able 26 on page 4 7. T able 5: Acronyms and a bbreviations Description Acronym/ Abr . Air Fan AF Au[...]

6 McQuay OM 751 Introduction Occupied Cooling Setpoint OCS Occupied Heati ng Setpoint OHS Occupancy Override Input OOI Occupancy Sens or Input OSI Proportional Integral PI Parts Per Million PPM Positive T emperature Coef ficient PTC Relative Humidi ty RH S pace Humidity Set point RHS Read Only RO Read Write R W S tandby Cooling Setpoint SCS S tandb[...]

McQuay OM 751 7 Getting St arted Getting S t arted The MicroT ech II Unit V ent Con troller (UVC) is a self-contained device that is capable of complete, stand-alone oper ation. Information in the control ler can be displayed and modified by using the keypad/display (local user interface). The follow ing sections describe how to use the keypad/disp[...]

8 McQuay OM 751 Getting Started T able 6: Keypad/display security levels Figure 2: Chan ging keypad/dis play security leve ls ON/STOP Key and LED Use the ON/STOP key to toggle the UVC between OFF mode and running (Applicat ion Mode Input). The ON/STOP LED is off when the UVC is in the OFF mode. Note – When the UVC is in the OFF mode, the e ffe ct[...]

McQuay OM 751 9 Getting St arted Using the Keyp ad/Display Viewing Actual Indoor Air T emperature (IA T) Normally , the effective set point temperature ap pears on th e keypad/display . Y ou also can use the keypad/display to view the indoor air temperature (IA T). See Figure 3. Note – When the actual indoor air temperature (Effective S pace T em[...]

10 McQuay OM 751 Getting Started Figure 5: Chan ging a keypad/d isplay menu item T able 7: K eypad/displ ay menu item list Display Keypad menu item list Abr . Descrip tion RO RW 1 05 Default rA Reset Alarm Input Enter 1 to clear alarms (clears all inactive alarms, except filte r alarm). T o enable the alarm again, enter 0. RW x // 2 HC UVC (Heat/Co[...]

McQuay OM 751 11 Getting St arted o5 Exhaust Inte rlock OAD Min Position set point EOAD Adjust OA dampe r position above wh ich the exhaust fan output will be energized. There is a fixed –5% dif ferential associated with this set point. RW x 99 % o6 Energize E xhaust Fan OAD Set point OADE Adjust OA damper min imum position when the exhaust inter[...]

12 McQuay OM 751 Description of Operation Description of Operation S tate Programming The MicroT ech II UVC takes advantage of “s tate” 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 cont[...]

McQuay OM 751 13 Description of Operation Figure 6: Complete UVC—state diagram UVC Unit Modes The UVC provides several “normal” modes of unit operation. These include: Off, Night Pur ge, Fan Only , Cool, Emer genc y Heat, Auto, Heat, and Cool. Normal UVC modes can contain a single st ate or several states depe nding upon the functionality req[...]

14 McQuay OM 751 Description of Operation T able 8: UVC state names and nu mbers OFF Mode (St ate 9) Off mode is provided so that the UVC can be forced into a powered OFF condition. OFF mode is a “stop” state for the unit ventilator; it is not a power off state. OFF mode consists of a single UVC state: OFF [9]. When OFF mode becomes active, the[...]

McQuay OM 751 15 Description of Operation Night Purge Mode (St ate 8) Night Purge mode is provided as a means to mo re easily and quickly ve ntilate 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 [...]

16 McQuay OM 751 Description of Operation Emergency Heat Mode (Super St ate) The Emergency Heat mode is provided for situ ations 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 O[...]

McQuay OM 751 17 Description of Operation Auto Mode Auto mode is provided so that the UVC can be set to automati cally 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) [...]

18 McQuay OM 751 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 pur pose of transition arguments. Low Limit State (S tate E) The Low Limit s[...]

McQuay OM 751 19 Description of Operation Figure 12: Cool mode super state diagram Econ State (S tate 3) The Econ state is a “normal” state during Cool mode. The Ec on state typically is active in the Cool mode when primary cooling (economizer) is available and adequate to meet the cooling requirements. When the Econ state becomes active, the U[...]

20 McQuay OM 751 Description of Operation Figure 13: Econ stat e operation (occupie d mode and auto fan) Econ Mech State (S tate 1) The Econ Mech state is a “normal” state during Cool mode. The Econ Mech state typically is active in the Cool mode when pr imary cooling (economi zer) alone is not adequate to meet the cooling requirements and both[...]

McQuay OM 751 21 Description of Operation The CO 2 demand controlled ventilation function (op tional) is active (see “CO 2 Demand Controlled V entilation (optional)” on page 34), and the OA damper is adjust ed as needed to maintain the CO 2 set point. Figure 15: Mech state o peration (occupied mode and auto fan) Discharge Air (DA) Heat St ate ([...]

22 McQuay OM 751 Description of Operation In each of these special purpos e 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 (Sup er State)” on page 16) and then return once the Emer gency Heat function is satisfied. T able 9:[...]

McQuay OM 751 23 Description of Operation Unit Mode Priority The UVC uses the network variables and binary inputs listed in T able 10 and T able 11 to determine the current unit mode. Special purpose UVC unit modes have high er priority than the normal UVC unit modes as shown in the tables. Each table lists the highest priorit y items on the le ft [...]

24 McQuay OM 751 Description of Operation Occup ancy Modes The UVC is provid ed with four occupan cy modes: O ccupied, Standby , Unoccu pied, and Bypass. The occupancy mode affects which h eating and cooling temp erature set points are used, affects IAF operation, and affects OAD operation. The Manual Adjust Occupancy and Networked Occupancy Sensor[...]

McQuay OM 751 25 Description of Operation Byp ass Mode The bypass mode (also called T en ant Override) is the equivalen t 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 UV C uses the occupied heating and cooling set points, the OAD op[...]

26 McQuay OM 751 Description of Operation S p ace T emperature Set Point s The UVC uses the six occupancy-based temperatur e set points as the basis to determine the Effective Set point Output. The ef fective set point is calculated based on the unit mo de, the occupancy mode, and the values of several network variables. The effective set point the[...]

McQuay OM 751 27 Description of Operation Remote W all-Mounted Sensor with +/–3°F Adjustment (optional) When the optional remot e wall-mounted sensor with +/–3°F adjustm ent dial is used, the UVC effectively writes the value of the set point ad justment dial to the Set Point Offset Input variable. Note – If a network connection is used to a[...]

28 McQuay OM 751 Description of Operation Figure 16: Effective set point calculations T able 15: Set point calculation ex amples Example A Given Occupanc yMode = Occupied or Byp assHeat/CoolMode = Heat S paceT empSetpoint = (not used) SetpointOf fset = (not used) = 0.0°F SetpointShi ft = (not used) = 0.0°F OHS = 69.8°F Effective set point calcul[...]

McQuay OM 751 29 Description of Operation Proportional Integral (PI) Control Loop s The MicroT ech II UVC uses PI-loop control for heating, cooling and ventil ation processes within the unit ventilator . Numerous PI al gorithms can be used depending upon the unit ventilator configuration. The UVC uses “sin gle” and “cascading” PI loops wher[...]

30 McQuay OM 751 Description of Operation PI Control Parameters Associated with each PI loop is a set of two adjustable pa rameters: Proport ional Band and Integral T ime. When the unit ve ntilator 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 pr[...]

McQuay OM 751 31 Description of Operation In general, it is best to start with a relatively large proportional band setting (the fact ory default setting is best) and adjust to smaller values. If you want the sy stem to respond strongly to small changes in the space, adjust the proportional band to a higher set ting. If you want the system to react[...]

32 McQuay OM 751 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 Configur ation variable that can be used to force the IA fan to cycle with calls fo r heating and cooling during th e occupied, standb[...]

McQuay OM 751 33 Description of Operation • Expanded (optional)—T emperature Comparison with OA Enthalp y Setpoint Economizer (Strategy 1) • Leading Edge (optional)— T em perature Comparison w ith Enthalpy Comp arison Economizer (Strategy 2) T emperature Comparis on Economizer (default) If the default Basic economizer function is se lected,[...]

34 McQuay OM 751 Description of Operation Networked Sp ace Humidity Sensor Capability A networked space humidity sensor can be netw ork interfaced with th e 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 Out door Hum[...]

McQuay OM 751 35 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 amoun t of ve ntilation whenever po ssible, which can be increased during normal operation for economizer cooling or CO 2 DCV contro l or reduced to prevent excessively cold di scharg[...]

36 McQuay OM 751 Description of Operation Compressor Minimum On and Off Timers The UVC is provided with minimu m On (3-minute default) and minim um Off (5-minute default) timers to prevent adverse compressor cycling. Compressor St art Delay The UVC is provided with a Compressor Start De lay configuration v ariable, which is intended to be adjusted [...]

McQuay OM 751 37 Description of Operation External Binary Input s The UVC is provided with three binary inputs that provide the function s described below . Figure 24: Bina ry inputs These inputs each allow a single se t of dry contacts to be used as a signal to the UVC. Multiple units can be connected to a single set of dry contacts. For wiring ex[...]

38 McQuay OM 751 Description of Operation Exhaust Interlock Input Sig nal This input allows a single set of dry contacts to be used to signal the UVC that an exhau st fan within the space is ener gized. The UVC reposi tions the OA damper to a user adjustable minimum position (Ex haust Interlock OA Damper Min Posi tion Setpoint). When the contacts c[...]

McQuay OM 751 39 Description of Operation Exhaust Fan ON/OFF Signal This relay output provides one set of Normall y Open dry contacts that can be used to signal the operation of an exhaust fa n. 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 t[...]

40 McQuay OM 751 UVC Input and O utput T able UVC Input and Output T able All UVC input and outpu t connections and their correspo nding unit ventil ator usage are shown in the following table. T able 21: Input s and outputs, softwa re model 05—DX cooling onl y I/O Description BO-1 Inside Fan High BO-2 Inside Fan Medi um BO-3 Electric Heat 1 BO-4[...]

McQuay OM 751 41 Diagnost ics and Service Diagnostics and Service The most important aspect of tro ubleshooting 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 an[...]

42 McQuay OM 751 Diagnostics and Se rvice Sp ace T emp Sensor Failure ( F0 ) The Space T emp Senso r Failure fault occurs when the UVC detects open or short conditions from the sens or . Effect: • Space fan de-ener gizes (unless in emergency heat mode). • Compressor immediately de-energizes. • Outdoor fan (if present) de-energizes. • Outsid[...]

McQuay OM 751 43 Diagnost ics and Service Condensate Overflow I ndication (optional) ( F4 ) The Condensate Overflow Indication fault will occur when the UVC detects high condensate levels within the units indoor coi l drain pan. Effect: • Compressor is immediately de-energized if in cooling. • Outdoor fan (if present) is de-energized. • Fault[...]

44 McQuay OM 751 Diagnostics and Se rvice Sp ace Humidity Sensor Failure (optional) ( FA ) The Space Humidity Sensor Fail ure fault occurs when the UVC detects open or short conditions from the sensor . Effect: • IA/OA Enthalpy compar ison economizer (if used) is disabled. • Dehumidification functio n (optional) is disabled. • Fault is indica[...]

McQuay OM 751 45 Diagnost ics and Service 3 Use the temperature reading from S tep 2 to determine the exp ected sensor resistance from Ta b l e 2 3 . 4 Using a calibrated ohmmeter , measure the act ual resistance across the two sensor leads. 5 Compare the expected resist ance to the actual resistance. 6 If the actual resistance value deviates subst[...]

46 McQuay OM 751 Diagnostics and Se rvice T able 24: Humidity ver sus voltage. T roubleshooting Carbon Dioxide (CO 2 ) Sensors The UVC is configured to use a 0–2000 PPM, 0–10 VDC, single beam absorp tion infrared gas sensor . Each sensor is calibra ted according to the table shown. Use the following procedure to troubleshoo t a suspect sensor .[...]

McQuay OM 751 47 UVC Configuration Parameters UVC Configuration Parameters The UVC is been provided with a number of configurat ion variables as listed in the following table. These configuration vari ables are st ored in UVC non-volatil e memory . For a descriptio n of supported network variables for each protocol, refer to Protocol Data Packet bu[...]

48 McQuay OM 751 UVC Configuration Parameters Primary Cool Proportional Ba nd 18°F (10 °C) Primary Cool Integral T ime 180 sec Secondary Cool Proportion al Band 18°F (10 °C) Secondary Cool Integr al Tim e 600 sec Discharge Air T emp Proportional Band 4°F (2.22°C) Discharge Ai r T emp Integral Time 300 sec CO 2 Proportion al Band 2 100 PPM CO [...]

McQuay OM 751 49 UVC Configuration Parameters OAD S troke Time 90 sec S plit-System OA/DX Coil T emp used on split-system un its only to partially disab le the compressor envelope by setting the outside DX coil tempera ture to a fixed valid value, enter 122°F (50°C) on split-systems, use 3 27.67 for self- contained un its (327.67 = invalid) 327.7[...]

© 2006 McQuay International • www.mcquay.com • 800-432-1342 McQuay T raini ng and Develop ment Now that you have made an investment in modern, ef ficien t McQuay equipment, its care should be a high priority . For training information on all McQuay HV AC products, please visit us at www .mcquay .com and click on training, or call 540-248-9646 [...]