To: Steve Ardolf, MSU Mankato From: Chris Plum, CEE. CC: Tim Ellingson, CEE. Angela Vreeland, CEE Dan Briese, MSU Mankato Date: April 21, 2014.

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1 To: Steve Ardolf, MSU Mankato From: Chris Plum, CEE CC: Tim Ellingson, CEE Angela Vreeland, CEE Dan Briese, MSU Mankato Date: April 21, 2014 Re: MSU Mankato Verification State PBEEEP Executive Summary The Center Energy and Environment has completed a review of trend data collected 16 buildings in support of the Measurement and Verification Phase of the State PBEEEP Program. Thirty one measures were reviewed. We found that only six were fully implemented, 21 were partially implemented and insufficient data is available to investigate four others. Four of the measures are no longer applicable and were not reviewed; this could happen if a building is being torn down or a major renovation is underway. The May and June 2012 PBEEEP Reports identified 35 Energy Conservation Opportunities (ECOs) spanning across 16 facilities. If implemented, they would save the campus $110,112 annually. In April 2013 CEE conducted a site visit to MSU Mankato and initiated trend data collection in support of measurement and verification activities. MSU Mankato sent trend data to CEE on a monthly basis so that the equipment operation could be analyzed during all weather conditions and modes of operation (summer break and school in session). Extensive review of the data indicates that many of the energy conservation opportunities have not yet been implemented as expected, thus preventing achievement of the full amount of potential energy savings. The report details the results of the current review all 16 buildings. Suggested action items are provided after a brief explanation and current status of each measure. The following table provides a summary of the status of ECOs at each building. CEE engineers have permed the measurement and verification as part of the Public Buildings Enhanced Energy Efficiency Program. Our contract that program ends on February 16, After that date we are available to meet with MSU Mankato staff in order to review the 31 energy conservation opportunities in further detail on a fee service basis. 1

2 Status Categories: Complete: has been completed as recommended by the PBEEEP provider. Partial: Some, but not all, of the implementation was completed OR changes were made, but they are not the changes that were recommended by the PBEEEP provider but get closer to the solution. Incomplete: The measure has not been implemented at all OR changes were made, but they are not the changes that were recommended by the PBEEEP provider and may worsen the problem. Inconclusive: More data is needed to verify the measure (i.e. heating season data is required, but not available at this time). Building Armstrong Hall Centennial SU Complete Partial/Incomplete Inconclusive Finding # Savings Finding # Savings Finding # Savings 2, 5 $1,503 1, 4, 7 $26, , 3 $7,560 - Ford Hall Highland Center Memorial Library - 5, 6, 8, 9 $7, , 2, 3 $24,218 4 $560 Morris Hall Myers Field House Nelson Hall w/ Addition Pennington Hall Perf Arts & Andreas Theater - 4 $2, , 5 $4, $164-1 $1,274 3 $1,444 2 $557 Taylor Center - 1 $3,830 - Trafton Hall 1 $7,372 2 $1,723 3 $4,341 Utility Plant 1 $6, $2,630 Wiecking Center Wigley Admin - 1, 3 $2,724-1 $2, TOTAL SUM 6 $18, $83,028 4 $8,088 2

3 Armstrong Hall High Priority Item: Potential savings of $21,796 will not be fully achieved because this measure has only been partially implemented. Status: Partial Eco #: 1 Building: Armstrong Hall AHU Runtime Reduction Reviewed building schedule with Owner to determine actual occupancy. New schedule will need to be added. : A schedule will be initiated on SF-1 and SF-2 to shut down the units when there is no occupancy in the building. There will be two schedules. During regular school session from August 24 to May 5 the units will run from 7 AM to 9 PM Monday through Thursday, 7 AM to 4 PM on Friday, 8 AM to 2 PM on Saturday, and off on Sunday. During summer session from May 6 to August 23 the units will run from 8 AM to 4 PM Monday through Friday and be off Saturday and Sunday. The SF status of SF-1 and SF-2 will be trended 15 minute intervals one week during the time period of August 24 to May 5 and one week from May 6 to August 23 to verify it is following the schedule specified in the section of the Findings Workbook. All space temperatures will be trended one week as well during peak heating season and peak cooling season to assure spaces are warming up or cooling down to the desired setpoints bee occupancy of the building. No on/off fan scheduling appears to have been completed. Instead, the operator noted that a day/night control mode w/ continuous fan operation is in place. Although the day/night terminal mode has been observed in the trend data, the originally estimated fan and outdoor air associated with this finding are in question. Summer Schedule: Day mode appears to be set : M-F 5am - 9pm. Sa,Su 5am-6pm. Fans are never off, but they can ramp down. Semester Schedule: Day appears to be set : M-Th 5:15am-10pm. Sa All day Su Through 5pm Fans are never off, but they vary in output down to 68 to 70% from max of ~80%. General: OA dampers are never commanded closed at night during anticipated unoccupied timeframe. OA dampers remain 47-49% open at night. 1) Command OA dampers close in unoccupied (night) mode. 2) If fans will not be scheduled completely off in unoccupied mode, provide clarification to the reviewer as to how fan speed is controlled in the night mode. Confirm that all points impacting fan speed control 3

4 within the desired sequence are currently being recorded so that the reviewer can confirm successful implementation. 4

5 Status: Complete Eco #: 2 Building: Armstrong Hall Optimize Economizer Modify the existing control economizer enable/disable sequence setpoint : In the building automation system, modify the economizer enable/disable setpoint to 71 deg. F SF-1, SF-2 and SF-3. Training will be given to staff so they are aware this value is now 71 F and if they change it due to operational issues, it needs to be documented and investigated why this value was changed. Review control sequence BAS screen verification that the modification of the economizer enable/disable took place. Trend the damper position each of the units during the outside air temperature of 71 deg. F to verify that the damper position transitioned between economizer and non-economizer. Using the Armstrong building-specific outdoor air temperature point MISC_SYS- OA-OAT_ARM, it appears that the 71 deg F setpoint has been implemented. No Action. 5

6 Status: Incomplete Eco #: 4 Building: Armstrong Hall Supply Air Temperature Reset is not implemented or is sub-optimal Modify the existing control programming of allow the supply air temperature to float between a minimum and maximum setpoint based on demand. : Modify the existing control programming SF-1 and SF-2 to allow the supply air temperature to float between a minimum (55 deg. F - adj) and maximum (65 deg. F - adj) setpoint based on cooling demand. Monitor the space temperatures being served by the AHU, once 20% (adj) of the space temperature require cooling, allow the supply air temperature setpoint to step from maximum to minimum. Once the space temperature cooling demand has dropped below 5% allow the supply air temperature setpoint to step from minimum to maximum. A DAT reset should be implemented unit SF-3 as well, but with the unit serving two zones and one of them contains a reheat, the zone without the reheat may require a DAT higher than 65 F and the calculation did not factor this in so savings it were not calculated, but the measure would save energy in SF-3 as well, just hard to quantify how much. Review control sequence program modifications and perm functional testing. Trend the number of cooling demand requests (or space temperatures) a minimum of two weeks to verify that all of the spaces meeting the required setpoints. Based on review of the DAT setpoint trend data SF-1 and SF-2, the measure has not been implemented. Also, SF-3 DAT and DAT-SP were not provided as requested in the last 10/18/13 correspondence with MSU Mankato. MSU Mankato: 1) Implement DAT reset SF-1, SF-2, and SF-3. 2) Include SF-3 DAT and DAT-SP within future trend data collection. 6

7 Status: Complete Eco #: 5 Building: Armstrong Hall The steam control valve is leaking steam Repair control valve to allow have it seat properly. : Repair steam valves AHU SF-1 and SF-2 so that it will seat and not allow steam by when in fully closed position. Trend the steam valve position, mixed air temperature and supply air temperature or datalog the temperature of the supply steam piping a minimum of two weeks to verify that when the steam valve is in the closed position, no steam is migrating into the heating coil. It appears that the measure has been implemented. If further trend data will be collected, include CLG-VLV SF-1 and SF-2. Otherwise, no action is required. 7

8 Status: Incomplete Eco #: 7 Building: Armstrong Hall Equipment is enabled regardless of need, or such enabling is excessive. VAV terminal unit Modify the control programming to allow scheduling of the VAV box fan to go unoccupied as per Owner's schedule : Modify the control programming all Fan Powered VAV boxes' fan speed to allow occupied/unoccupied control by reducing the fan speed to zero during unoccupied conditions. The VAV boxes will have to engage during unoccupied times if the space temperature falls below space temperature setpoint. Review programming of VAV boxes and perm functional testing. Trend the VAV box fan speed a minimum of two weeks to verify that when the VAV box is in unoccupied mode the fan speed drops to zero. The measure could not be verified at this time. Additional operational details including fan-powered box status or box flow points are required. Furthermore, if the main AHU fans do not turn off per ECO 1, this ECO cannot be implemented as originally planned. If this measure is still intended implementation, MSU Mankato will: 1) Confirm intent. 2) Confirm which fan-powered boxes are impacted by this measure. 3) Enable VMA fan status and/or flow (CFM) trend data on all (or a sample) of applicable fan-powered units as well as clarify what activates/deactivates terminal unit fans. 4) Continue collecting the previously trended points. 8

9 Centennial Student Union High Priority Item: Potential savings of $7,219 will not be fully achieved because this measure has only been partially implemented. Status: Partial Eco #: 1 Building: Centennial Student Union AHU Run Time Reduction Modification of the existing equipment schedule residing in the BAS. : A schedule will be initiated on all AHUs to shut down the units when there is no occupancy in the building. There will be two schedules. During regular school session the units will run as per the earliest scheduled posted on the University's website. The AHU schedule will change each semester and the owner should update the schedules accordingly. The new current schedule was set to the following: SF-23: From September 1st to May 31st: Monday through Thursday 7 AM to 7 PM, Friday 7 AM to 4 PM Saturday 11 AM to 3 PM. The unit will be off on Sunday. From June 1st to August 31st, SF-23 is on Monday through Friday 8 AM to 4 PM Off Saturday and Sunday SF-27 will operate continuously, Monday through Friday 6 AM to Midnight, Saturday 8 AM to midnight and Sunday 10 AM to midnight. The SF status of all AHUs will be trended 15 minute intervals one week during the time period of regular school session and one week the summer school session to verify it is following the schedule specified in the section of the Findings Workbook. All space temperatures will be trended one week as well during peak heating season and peak cooling season to assure spaces are warming up or cooling down to the desired setpoints bee occupancy of the building. SF-23 appears to be scheduled partially in accordance with the ECO. Generally, the AHU is operated longer than the originally proposed M-F and Sa. The AHU also operates on Sunday where previously it was expected to be off. M-F: ~6:30am-11pm Sa,Su: ~6:30am-12am SF-27 trend data still has not been received and thus the schedule has not been verified. BAS review on April 2013 indicated no operating schedule was available SF-27. Additional trend points as requested in the last 10/18/13 correspondence with MSU Mankato were not provided. 9

10 MSU Mankato: 1) Confirm the intended semester SF-23 and SF-27 operating schedule. 2) Collect additional trend data. Include points SU_SF27_Sta-Sto and SU_SF27_SF-Stat in addition to previously trended points. 10

11 Status: Partial Eco #: 3 Building: Centennial Student Union Reheat Pumps Runtime Reduction Pump, HW distribution Modify the existing control sequence programming to allow the pumps to run whenever the outside air temperature is less than 75 deg. F. : Modify the existing control sequence programming to allow the pumps to run whenever the outside air temperature is less than 75 deg. F and any combination of reheat valve control is greater than 10% (adj). If the outside air temperature is greater than 75 deg. F (adj), monitor the reheat valve position and if 20% (adj) of the reheat valves are opening, allow the pumps to start. Disable the pumps when the valve positions are less that 5% (adj). Review the control sequence program modifications and perm functional testing. Trend the reheat valve positions and space temperatures two weeks when the outside air temperature is great than 75 deg. F to verify that the spaces are getting adequate reheat. The OAT lockout setpoint has been changed to 75 deg F, thus completing the major requirement of the measure. However, only SF1-RH03-VLV was available terminal unit review. It indicated no call reheat during the sample set, thus preventing the ability to verify if the sequence polls multiple reheat valves. MSU Mankato: 1) Confirm if the control sequence will monitor multiple reheat positions to activate pumps when above 75 deg F OAT. 2) If item 1 will be completed, trend additional reheats beyond just SF1- RH03-VLV. Otherwise, if staff has found no issues with zone temperature, the measure is complete. **Note that HWP-1 did not activate during the entire summer data set. HWP-2 was the only pump that would operate, indicating a need additional programming to rotate lead pump designation. Continuous operation of one pump may lead to early failure.** 11

12 Ford Hall Status: N/A Eco #: 1 Building: Ford Hall Exhaust Fan Volume Reduction Other This ECO proposes to ramp the exhaust fans based on laboratory demand and leave the outside air damper in the closed position. : For EF-30A, EF-30B, EF-31A, EF-31B, EF-32A, EF-32B, EF-33A and EF-33B. These exhaust fans will have the OA damper associated with Exhaust fans on AHU-30, 31, 32, and 33 closed off. If the exhaust fans don't already have VFDs on them, a VFD will have to be installed on the fans. The cost that is included in the Contractor Cost this measure. If the units do have VFDs, the cost will decrease. The exhaust fans will modulate their speed based off the duct static pressure setpoints. This setpoint will be set by a balancer. The setpoint will be when the fan is at 100% and all spaces require 100% exhaust flow. Units 31 and 33 don't have duct static pressure readings on them at this time, if they require these points to be mapped and setup they will have to be. This cost was also factored into the contractor cost, if it is not needed the cost will decrease to implement this measure. There are two areas of concern which need to be addressed bee this measure is implemented. One is if the OA dampers are used in any way to assure space pressure. If they are, this measure needs to be re-visited bee it is implemented. The other area is associated with the throw of the exhaust fan. If the exhaust requires a certain throw from the diffuser it will be decreased if the speed of the fan is reduced. Throw requirements of the exhaust air need to be investigated bee this measure can be implemented. Functional testing, equipment inspection and trending of the EFs VFD Speed, Exhaust Duct Static Pressure, Exhaust Duct Static Pressure Setpoint, Exhaust Fans Outside Air Damper Position at an interval of 15 minutes a period of two weeks during the normal school session and summer school sessions. Based on feedback from MSU Mankato, this measure has not been implemented and is not planned implementation at this time. N/A 12

13 Highland Center Status: Partial Eco #: 5 Building: Highland Center HIGHLAND SF-2 Implementing VFD's on both the supply and return fans will allow fan energy savings as well as cooling and heating savings of outdoor air during low occupancy times. : is to provide appropriately sized VFD's the supply fan. During occupied conditions, the supply fan speed shall modulate to maintain a space temperature setpoint and the heating and cooling valves shall modulate to maintain a constant discharge air temperature. During unoccupied times, the supply fan VFD settings shall be set to maintain a constant exhaust rate per ASHRAE guidelines. The heating and cooling valves shall continue to modulate to maintain a night setback temperature at a reduced temperature during winter and an increased temperature during summer during unoccupied times additional energy savings. Electrical contractor to install VFD's, test and balancer shall set minimum VFD speeds as required to maintain minimum exhaust rate required the space. Controls contractor to provide additional points related to VFD operation and upgrade controls strategy as required. Trending of all relevant points including zone temperature, chilled water and hot water valve positions, damper position, DAT, RAT, MAT, RAH, EAT, and OAT will demonstrate unit operation. The additional VFD fan speed shall be trended to verify a reduction in fan speed. The trending shall take place during both summer and winter conditions to ensure unit operates to maintain space temperature requirements both during occupied and unoccupied times. A supply fan VFD has been implemented, and the unoccupied VFD state reaches 50% output. This state occurs any time other than M-F ~5:30am-11:00pm. Otherwise, the supply fan is at 100%. MSU Mankato: 1) Clarify how the 50% unoccupied fan speed setpoint setback was determined. Can this go lower? **Note that during the summer data review, the heating valve had appeared to continuously modulate. It appears that this issue may have been resolved. If not, consider reviewing htg lockouts.** 13

14 Status: Partial Eco #: 6 Building: Highland Center HIGHLAND SF-3 (HY_SF3) Provide an occupancy schedule the unit to save energy. : The recommendation is to utilize the existing AHU schedule provided. The new unit operation calculated energy savings occupancy between 6:00AM and 10:00PM and off during unoccupied times. This is a reasonable runtime as the unit serves both offices as well as corridor spaces. The unit will be operated 7 days a week due to some of the spaces it serves (corridors and hallways). In addition, the calculation assumed the unit would operate when outdoor air temperatures were below 20 degrees to prevent space freezing in a night setback operation. Trending of all relevant points including zone temperature, chilled water and hot water valve positions, damper position, DAT, RAT, MAT, fan speeds and OAT will demonstrate the existing unit operation. Upon the schedule alteration, the unit VFD speeds shall demonstrate they follow the appropriate schedule. The outdoor air damper position shall close when the VFD's are in the unoccupied mode. The chilled water valve shall stay closed when unoccupied and the hot water valve position shall close unless a call freeze protection opens valve. Trends indicate fan operation 4:15am to 10pm M-F and Sa-Su. This represents 1.75 more hours per day (638 hours annually) than originally calculated. Furthermore, it is uncertain whether the outdoor air damper is closed when the unit is in unoccupied mode. MSU Mankato: 1) Confirm occupied/unoccupied and any system warm-up or cool-down schedule(s). Confirm when OA damper is intended to be closed. 2) MSU Mankato to provide additional trend data a swing and heating season that also includes HY_SF3 points OCCUPIED, RF-STAT, RF- VFD, MAT, MIN-POS, OA-CFM, MIN-CFM, DEAD-BND, DAT, DAT-SP, HTG-VLV, CLG-VLV, RAT, ZN-T, and ZN-SP. 14

15 Status: N/A Eco #: 7 Building: Highland Center HIGHLAND SF-4 Provide a space cooling device such as a split system to provide cooling during unoccupied times. The unit shall operate when the air handling unit is not in operation. : The recommendation is to provide a Mitsubishi Mr. Slim split DX system to provide cooling to the store area to allow the air handling unit to disable during unoccupied times. The split system shall operate off a space temperature thermostat and be provided with internal controls. The cooling device shall be wall mounted within the shop space. The CU shall be installed within the mechanical room on the second floor. The air handling unit shall return to its original occupancy operation. The calculation energy savings assumed the unit operation would be from 6:00AM to 10:00 PM. The unit shall be scheduled to operate 7 days a week due to the spaces it serves. In addition, the calculation assumed the unit would operate when outdoor air temperatures were below 20 degrees to prevent space freezing in a night setback operation. Trending of all relevant points including zone temperature, chilled water and hot water valve positions, damper position, DAT, RAT, MAT, fan speeds and OAT will demonstrate the existing unit operation. Upon the schedule alteration, the unit VFD speeds shall demonstrate they follow the appropriate schedule. The outdoor air damper position shall close when the VFD's are in the unoccupied mode. The chilled water valve shall stay closed when unoccupied and the hot water valve position shall close unless a call freeze protection opens valve. Trending of the space temperature where the split system is installed will demonstrate the space temperature remains at acceptable levels during unoccupied times regardless of the AHU operation. Spot verification of unit operation will also demonstrate an appropriate installation of the CU by adjusting the wall thermostat to ensure the unit energizes as required to maintain an appropriate space temperature. Based on inmation received in April 2013 from MSU Mankato, a separate DX unit has not been installed. N/A 15

16 Status: Incomplete Eco #: 8 Building: Highland Center OTTOS SF-4 Releasing the control of the chilled water valve will allow unit to operate per the original sequence. : The recommendation was to correct the valve modulation issue. It was discussed and this finding has already been corrected. This calculation and finding was included to report the calculated energy savings. This calculation is conservative because it only calculates heating savings during times the air handling unit could be economizing and does not look at time the unit is subcooling when the AHU is operating in a cooling mode. Trending of all relevant points including zone temperature, chilled water and hot water valve positions, damper position, DAT, RAT, MAT, fan speeds and OAT will demonstrate the unit operation. The unit shall not be operating in a simultaneous heating and cooling scenario due to the previous excessive cooling. Based on review of trend data from May 29 through September 29, 2013, the cooling valve remained at 50% the entire data sample set. OTTO_SF4-CLG- O remained at 50% regardless of SF-4 status. MSU Mankato: Release the cooling coil to automatic control and confirm cooling valve actuation. Provide an additional trend data set review after the coil is released. 16

17 Status: Partial Eco #: 9 Building: Highland Center OTTO SF-2 Implementing VFD's on both the supply and return fans will allow fan energy savings as well as cooling and heating savings of outdoor air during low occupancy times. : is to provide appropriately sized VFD's both supply and return fans. During occupied conditions, the supply fan speed shall modulate to maintain a space temperature setpoint and the heating and cooling valves shall modulate to maintain a constant discharge air temperature. The return fan VFD shall modulate to maintain a set offset with the supply fan VFD to maintain a negative pressure with respect to adjacent spaces. During unoccupied times, the supply and return fan VFD settings shall be set to maintain a constant exhaust rate per ASHRAE guidelines. The heating and cooling valves shall continue to modulate to maintain a night setback temperature at a reduced temperature during winter and an increased temperature during summer during unoccupied times additional energy savings. Electrical contractor to install VFD's, test and balancer shall set minimum VFD speeds as required to maintain minimum exhaust rate required the space. Controls contractor to provide additional points related to VFD operation and upgrade controls strategy as required. Trending of all relevant points including zone temperature, chilled water and hot water valve positions, damper position, DAT, RAT, MAT, RAH, EAT, and OAT will demonstrate unit operation. The additional VFD fan speed shall be trended to verify a reduction in fan speed. The trending shall take place during both summer and winter conditions to ensure unit operates to maintain space temperature requirements both during occupied and unoccupied times. Although VFDs appear to have been installed on the supply and return fans, the schedule should be inspected. All days of the week show supply and return fans off briefly ~15-30 minutes at midnight, then immediately operating at 50% output until 4:30am, leading to 100% output until 11:45pm. Also, select points that were requested in the last 10/18/13 correspondence with MSU Mankato were not provided. MSU Mankato: 1) Provide intended SF-2 sequence of operation 2) Include trend points OCCUPIED, NITSFSPD, NITRFSPD, and RAT-SP in next iterations of trend data swing and heating seasons. 3) Confirm if temperature setback was pursued or implemented. At this time, it appears that a setback has not been implemented. 17

18 Memorial Library High Priority Item: Potential savings of $22,026 will not be achieved because this measure has not been implemented. Status: Incomplete Eco #: 1 Building: Memorial Library AHU Runtime Reduction (SF-1, SF-2, SF-3, and SF- 36) Modification of the existing equipment schedule residing in the BAS. : A schedule will be initiated on SF-1, SF-2, SF-3 and SF-36 to shut down the units when there is no occupancy in the building. There will be two schedules. During regular school and during the summer session. The AHUs will follow the schedule below the regular school year: SF-1, SF-2, SF-3 and SF-36: 7 AM to 2 AM Monday through Thursday, 7 AM to 7 PM Friday, 10 AM to 6 PM Saturday, 1 PM to midnight on Sunday. The AHU will follow the schedule below the summer session will follow the schedule below: SF-1, SF-2, SF-3 and SF-36: 7 AM to 7 PM Monday through Thursday, 7 AM to 5 PM Friday, 10 AM to 5 PM Saturday, 1 PM to 9 PM Sunday The SF status of all AHUs will be trended 15 minute intervals one week during the time period of regular school session and one week the summer school session to verify it is following the schedule specified in the section of the Findings Workbook. All space temperatures will be trended one week as well during peak heating season and peak cooling season to assure spaces are warming up or cooling down to the desired setpoints bee occupancy of the building. General observations: 1) SF-1 and SF-3 VFD operate at 80% speed occupied periods and increase to ~100% during unoccupied periods. 2) SF-2 and SF-36 appear to adhere to a finite on/off schedule. 3) SF-1 and SF-3 never turn off, and it is uncertain whether the 80%/100% fan rates were already in place bee the PBEEEP study. Projected savings 80%/100% operation will vary significantly from the suggested ECO on/off mode. SF-1 and SF-3 account 95 HP of fan energy. 4) SF-2 humidification setpoint (40%) differs from SF-1,3, and 36 (30%). 5) Day night control point DN-CTRL appears to hold the same state, and DN2-CTRL, and DN3-CTRL data are incomplete, possibly due to a sampling rate or resolution issue. Additional inmation is required (below) in order to verify energy savings (if any) due to the current operating schedule. 18

19 MSU Mankato: 1) Confirm that DN-CTRL, DN2-CTRL, DN3-CTRL, and all SF minute trend data will collect the same duration as other trended points without gaps. 2) Confirm which return condition (temperature, relative humidity, enthalpy), trend point (average VAV zone temperature), or summer/winter/day/night setpoint controls SF-1, 2, 3, and 36 fan speeds. SF-2 is of specific interest since it does not have summer/winter day/night setpoints. 3) Clarify the intended impact of item 2 to AHU fan speeds SF-1, 2, 3, and 36. 4) Continue to collect trend data 19

20 Status: Incomplete (Updated) Eco #: 2 Building: Memorial Library AHU Optimize Economizer Modification of the existing BAS economizer enable/disable setpoint. : Modify the economizer enable/disable setpoint SF-1, SF-2, SF-3 and SF-36 from the existing value of 68 deg. F to the recommended value of 71 deg. F Review control sequence BAS screen verification that the modification of the economizer enable/disable took place. Trend the damper position each of the units during the outside air temperature of 71 deg. F to verify that the damper position transitioned between economizer and non-economizer. Review of heating season data indicates the air handlers still have suboptimal economizer lockout setpoints. MSU Mankato: 1) Confirm which outdoor air temperature trend point is used by the building automation system Memorial Library. 2) Implement a 71 deg economizer OAT lockout SF-1, SF-2, SF-3, and SF-36. 3) Include screen captures showing the economizer lockout SF-1, SF-2, SF-3, and SF-36 4) Continue collecting trend data this measure. Include the relevant Memorial Library OAT point referenced in item 1 of this message block (if a global points is not included already). 20

21 Status: Incomplete (Updated) Eco #: 3 Building: Memorial Library AHU Supply Air Temperature Reset Modify the existing control programming of allow the supply air temperature to float between a minimum and maximum setpoint based on demand. : Modify the existing control programming SF-1 and SF-2 to allow the supply air temperature to float between a minimum (55 deg. F - adj) and maximum (65 deg. F - adj) setpoint based on cooling demand. Monitor the space temperatures being served by the AHU, once 20% (adj) of the space temperature require cooling, allow the supply air temperature setpoint to step from maximum to minimum. Once the space temperature cooling demand has dropped below 5% allow the supply air temperature setpoint to step from minimum to maximum. Review control sequence program modifications and perm functional testing. Trend the number of cooling demand requests (or space temperatures) a minimum of two weeks to verify that all of the spaces meeting the required setpoints. Trend the MAT, DAT, RAT, OAT, SF speed, SF status, DAT setpoint, and OA damper to assure the unit is operating properly to maintain the DAT setpoint. Review of trend data indicates no DAT reset SF-1 and SF-2. MSU Mankato: 1) Clarify if the DAT reset has been implemented, or clarify how the DAT reset will be implemented. 2) Continue to collect trend data. 21

22 Status: Inconclusive Eco #: 4 Building: Memorial Library Reheat Pump Runtime Reduction Pump, HW distribution Modify the existing control sequence programming to allow the pumps to run whenever the outside air temperature is less than 50 deg. F. : Modify the existing control sequence programming to allow the pumps to run whenever the outside air temperature is less than 50 deg. F and any combination of reheat valve control is greater than 10% (adj). If the outside air temperature is greater than 50 deg. F (adj), monitor the reheat valve position and if 15% (adj) of the reheat valves are opening, allow the pumps to start. Disable the pumps when the valve positions are less that 5% (adj). Review the control sequence program modifications and perm functional testing. Trend the reheat valve positions and space temperatures two weeks when the outside air temperature is great than 50 deg. F to verify that the spaces are getting adequate reheat. Trend P-1, P-2, P-5, and P-6 pump status as well to assure they are disengaging and engaging when they should be. Temperature data were not available within the desired OAT range after 10/18/13 to properly confirm implementation. Furthermore, additional points requested in 10/18/13 correspondence were not available review. MSU Mankato: 1) Confirm if MSU Mankato intends to monitor reheat control valves as part of measure implementation. 2) Confirm which outdoor air temperature trend point is used by the building automation system enabling the referenced pumps. 3) Continue to collect trend data. Also, include points HWP1-ST, HWP2-ST, OA-NEWHX, OA-RHTHX, and in addition to previously supplied trend data. 22

23 Morris Hall Status: N/A Eco #: 1 Building: Morris Hall SF-1 Runtime Reduction Modification of the existing BAS schedule. : A schedule will be initiated on SF-1 to shut down the units when there is no occupancy in the building. There will be two schedules. During regular school session from August 24 to May 5 the units will run from 8 AM to 10 PM Monday through Thursday, 8 AM to 5 PM on Friday, and off on Saturday and Sunday. During summer session from May 6 to August 23 the units will run from 8 AM to 4 PM Monday through Friday and be off Saturday and Sunday. The SF status of SF-1 will be trended 15 minute intervals one week during the time period of August 24 to May 5 and one week from May 6 to August 23 to verify it is following the schedule specified in the section of the Findings Workbook. All space temperatures will be trended one week as well during peak heating season and peak cooling season to assure spaces are warming up or cooling down to the desired setpoints bee occupancy of the building. This building was going through a full HVAC renovation, so this measure is no longer valid. None Status: N/A Eco #: 2 Building: Morris Hall SF-1 Optimizer Economizer Modification of the existing BAS economizer enable/disable setpoint. : Modify the economizer enable/disable setpoint from the existing value of 66 deg. F to the recommended value of 71 deg. F. Training will be given to staff so they are aware this value is now 71 F and if they change it due to operational issues, it needs to be documented and investigated why this value was changed. Review control sequence BAS screen verification that the modification of the economizer enable/disable took place. Trend the damper position a two week period each of the units during the outside air temperature range of 60 to 75 deg. F to verify that the damper position transitioned between economizer and noneconomizer. This building was going through a full HVAC renovation, so this measure is no longer valid. None 23

24 Myers Field House Status: Partial (Updated) Eco #: 4 Building: Myers Field House SF-5 and SF-6 have leaky heating valves. Replace leaky steam valve on SF-5 and leaky hot water valve on SF-6 : Building engineer will replace existing low pressure steam valve with new valve. Trending of all relevant points including zone temperature, chilled water and heating valve positions, damper position, DAT, RAT, MAT, and OAT will demonstrate unit operation. The trending shall take place during both summer and winter conditions to ensure unit operates to maintain space temperature requirements both during occupied and unoccupied times. The heating valve SF-5 no longer leaks, but the heating valve SF-6 does. There is a 20F rise across the heating coil, regardless of the valve position. MSU Mankato: Repair/replace the heating valve SF-6. 24

25 Nelson Hall with Addition Status: Incomplete (Updated) Eco #: 1 Building: Nelson w/addition AHU/RTU Runtime Reduction Modification of the existing equipment schedule residing in the BAS. : A schedule will be initiated on all AHUs and RTUs to shut down the units when there is no occupancy in the building. There will be two schedules. During regular school session the units will run as per the earliest scheduled classroom or 8AM whichever is earliest staff and students. Currently the new proposed regular school session schedule unit would be: SF-1: 8 AM-9PM Monday through Thursday, 8 AM to 3 PM Friday and off Saturday and Sunday RTU-2: 8 AM to 10 PM Monday through Thursday, 8 AM to 5 PM Friday and off Saturday and Sunday SF-5: 8 AM to 8 PM Monday through Thursday, 8 AM to 5 PM Friday and off Saturday and Sunday SF-6: 8 AM to 10 PM Monday through Thursday, 8 AM to 5 PM Friday and off Saturday and Sunday SF-7: 8 AM to 6 PM Monday through Thursday, 8 AM to 5 PM Friday and off Saturday and Sunday SF-8: 8 AM to 9 PM Monday through Thursday, 8 AM to 5 PM Friday and off Saturday and Sunday RU-1: 8 AM to 10Pm Monday through Thursday, 8 AM to 6 PM Friday and off Saturday and Sunday RU-2: 8 AM to 5 PM Monday through Friday, off Saturday and Sunday RU-3: 8 AM to 9 PM Monday through Thursday, 8 AM to 6 PM Friday and off Saturday and Sunday The summer schedule each unit currently would be as follows: SF-1: 8 AM to 3 PM Monday through Thursday, 8 AM to noon on Friday, and off Saturday and Sunday RTU-2: 8 AM to 4 PM Monday through Friday and off Saturday and Sunday SF-5: 8 AM to 4 PM Monday through Friday and off Saturday and Sunday SF-6: Monday through Friday 8 AM to 3 PM off Saturday and Sunday SF-7: 8 AM to 4 PM Monday to Friday and off Saturday and Sunday SF-8: Off RU-1: 8 AM to 4 PM Monday through Friday and off Saturday and Sunday RU-2: 8 AM to 4 PM Monday through Friday and off Saturday and Sunday RU-3: 8 AM to 4 PM Monday through Friday and off Saturday and Sunday The SF status of all AHUs will be trended 15 minute intervals one week during the time period of regular school session and one week the summer school session to verify it is following the schedule specified in the section of the Findings Workbook. All space temperatures will be trended one week as well during peak heating season and peak cooling season to assure spaces are warming up or cooling down to the desired setpoints bee occupancy of the building. In general, this measure has not been implemented because all of the AHUs operate at least one more hour per day than the recommended schedule provided in the section above, often as much as 4 extra hours per day. In addition, RTU-2 and RU-3 are run 24/7 during the school year. MSU Mankato: Adjust air handler schedules so that they are operated as few hours as possible while still maintaining comtable spaces occupancy. 25

26 Status: Incomplete Eco #: 5 Building: Nelson w/addition Reheat Pump Runtime Reduction Pump, HW distribution Modify the existing control sequence programming to allow the pumps to run whenever the outside air temperature is less than 55 deg. F. : Modify the existing control sequence programming to allow the pumps to run whenever the outside air temperature is less than 55 deg. F and any combination of reheat valve control is greater than 10% (adj). If the outside air temperature is greater than 55 deg. F (adj), monitor the reheat valve position and if 15% (adj) of the reheat valves are opening, allow the pumps to start. Disable the pumps when the valve positions are less that 5% (adj). Review the control sequence program modifications and perm functional testing. Trend the reheat valve positions and space temperatures two weeks when the outside air temperature is great than 55 deg. F to verify that the spaces are getting adequate reheat. The status of Reheat pump 1 and 2, Auto HW 1 and 2 and the Radiation pump will be trended during this same period to assure they are turning off. The lockout the pumps has been reduced to 75F (from 99F) regardless of the reheat and radiation valve positions. Although the pumps no longer operate between 75 and 99F, they are not operating according to the provider s recommendation. MSU Mankato: Determine if the current pump lockout is sufficient or if the valve positions should be taken into account. The trends indicate that the heating valves were opening well above 75F, which could lead to some spaces getting overcooled. If this was an issue, polling the valves is recommended. 26

27 Pennington Hall NOTE: During verification, CEE discovered that the duct static pressure sensor AHU-5 is likely out of calibration. It reads 0.5 wc when the unit is off. Status: Incomplete Eco #: 4 Building: Pennington Hall Leaky valve chilled water valve Replace leaky chilled water valve : The current leaking valve will have to be replaced by a new valve. The sequences will then have to be checked to assure when the valve is closed it is not leaking and when it is 100% open it is meeting system design requirements. Field verify the valve replacement. Trend the following points on the building automation system AHU5 and CHWP-3 a two week period during the summer season: SF status, SF speed. OAT, RAT, MAT, DAT, OA Damper, chilled water valve, hot water valve, zone temperature, CHWP 3 status, and CHWP 3 differential pressure. When the chilled water valve is closed and AHU-5 is on, the DAT is much lower than the MAT, even with the hot water valve wide open. The chilled water valve is clearly still leaking. MSU Mankato: Replace the chilled water valve. 27

28 Status: Inconclusive (Updated) Perming Arts Eco #: 2 Building: Perming Arts Exhaust fan 31 Other Currently exhaust fan 31(10,000cfm) serves the scene shop area in the preming arts center and is being left on extensive periods of time. : The existing on/off switch will be replaced with a timer switch the will energize the fan four hours once it is turned on then turn off until the button is re-energized. The exhaust fan status will be trended a two week period. A temperature logger will be placed in the area as well to show when the fan is off, the zone temperature is remaining constant and not requiring as much heat as bee. If there is a reheat valve associated with the room the data logger is in that will be trended as well. This exhaust fan was never operated during the summer or school year. It is unclear why it was never operated and if it is turned on, whether the fan will only operate 4 hours as intended. MSU Mankato: review changes that were made to the exhaust fan on/off switch to ensure the fan will run when switched on to avoid issues with indoor air quality. 28

29 Status: Incomplete Eco #: 3 Building: Perming Arts Simultaneous heating and cooling on AHU1 Air handler unit 1 and 2 are simultaneously heating and cooling due to poor controls sequencing. : Revise existing controls sequence: When there is a call mechanical cooling, the cooling control valve is modulated to maintain a discharge temperature set point of 55F. The fan speed is modulated to maintain the space temperature set point. The heating valve shall be disabled when the outdoor air temperature is greater than 55F. When there is a call heating open reheat control valve to maintain space temperature. The unit will be trended two weeks during the summer season. The following points will be trended, SF status, SF speed, OAT, RAT, MAT, DAT, Chilled water valve, Hot water valve, Space temperature, and RF VFD. This measure has not been implemented. During the summer the cooling valve fully opens when the AHU turns on and remains at 100% open all day. Meanwhile, the heating valve modulates open and closed throughout the day to raise the DAT, since the fully open cooling valve lowers the DAT too much. MSU Mankato: Revise the controls sequences per the above. 29

30 Status: Complete (Updated) Eco #: 1 Building: Perming Arts Andreas Theater Makeup/changing room and bathroom exhaust is running 24/7 when area is unoccupied. Currently the exhaust fans the two make-up/changing areas and the two bathrooms located backstage are operating 24/7. These areas are not used except during dress rehearsals and theater permances. : The controls contractor will install 2 occupancy sensors. One located in the women's makeup changing room and one located in the men's makeup changing room. The Controls contractor will also interlock the bathroom exhaust fans with the corresponding make-up room exhaust fans. Once the occupancy sensor is triggered the corresponding exhaust fans will energize and the outdoor air damper on AHU-2 will modulate open to accommodate additional makeup air demand once the room becomes unoccupied the exhaust fans will de-energize and the outdoor air damper will modulate back to a minimum position. A balancer will have to balance the OA dampers to assure the OA dampers are allowing the proper amount of air. There will have to be 2 balance points, one when the exhaust fans are on and one when the exhaust fans are off. The Exhaust fan status, OA dampers, OAT, MAT, RAT, DAT, OACFM, heat valve, and chilled water valve will be trended a two week period to insure the unit is operating as specified. The PRVs and AHU turn on and off and are no longer running 24/7, but the operating hours seem to be excessive. The PRVs are frequently operated 10 hours at a time, often starting at 2AM, which would not be the expected occupancy start time. In addition, AHU-2 was operated non-stop from Jan AHU-2 does appear to be bringing in the proper amounts of outside air and is no longer running 24/7, so this measure is considered implemented. None 30

31 Taylor Center Status: Incomplete Eco #: 1 Building: Taylor Center SF-5/EF-9 Schedule Utilizing the existing VFD's on both the supply and exhaust fans will allow fan energy savings as well as cooling and heating savings of outdoor air during low occupancy times. : is to utilize VFD's both the supply and exhaust fans. During occupied conditions, the supply fan speed shall modulate to maintain a space temperature set point and the heating and cooling valves shall modulate to maintain a constant discharge air temperature. The exhaust fan VFD shall modulate to maintain a set offset with the supply fan VFD to maintain a negative pressure with respect to adjacent spaces. During unoccupied times, the supply and exhaust fan VFD settings shall be set to maintain a constant exhaust rate per ASHRAE guidelines. The heating and cooling valves shall continue to modulate to maintain a night setback temperature at a reduced temperature during winter and an increased temperature during summer during unoccupied times additional energy savings. Test and balancer shall set minimum VFD speeds as required to maintain minimum exhaust rate required the space. Controls contractor to upgrade controls strategy as required. Trending of all relevant points including zone temperature, chilled water and hot water valve positions, damper position, VFD fan speeds, DAT, RAT, MAT, RAH, EAT, and OAT will demonstrate unit operation. The trending shall take place during both summer and winter conditions to ensure unit operates to maintain space temperature requirements both during occupied and unoccupied times. This measure was not implemented as intended. Rather than creating a setback where the temperature in the space sets back and the fan speed slows down, the static pressure setpoint was changed from 1.5" to 0.5" at all times. As a result, the space temperature setpoint of 68 is not being met during the summer. It stays in the mid-70s due to insufficient airflow. This measure needs to be adjusted or there will be comt complaints. MSU Mankato: Revise the controls sequences per the above. 31

32 Trafton Hall Status: Complete Eco #: 1 Building: Trafton Hall AHU Scheduling AHU's 1A, 1B, 2, and 3. Currently AHU's 1A, 1B, 2, and 3 are operating 24/7. Building management along with the controls contractor shall adjust AHU's to follow occupancy schedule on BAS system : Air handler units 1A, 1B, 2, and 3 will be scheduled on from 7 AM to 9 PM Monday through Friday and off on Saturday and Sunday. Hours of operation will be determined at the start of each semester and dictated by class schedules. Summer operation air handler units 1A, 1B, 2, and 3 is as follows: When the space is unoccupied and the outdoor air temperature is above 55 deg. F the unit will de-energize, the chilled water and heating water valves will close, and the outdoor air dampers will close. Winter operation air handler units 1A, 1B, and 3 is as follows: When the space is unoccupied and the outdoor air temperature is below 55deg. F the unit will de-energize, the chilled water valve will close, the heating water valve will open, and the outdoor air dampers will close. When the space temperature is below the unoccupied set point of 55deg. F, the unit will energize to meet the unoccupied set point, at this time the OA dampers will remain closed. Winter operation air handler unit 2 is as follows: When the space is unoccupied and the outdoor air temperature is below 55deg. F but warmer than 40deg. F the unit will de-energize, the chilled water valve will close, the heating water valve will open, and the outdoor air dampers will close. When the space temperature is below the unoccupied set point of 55deg. F, the unit will energize to meet the unoccupied set point, at this time the OA dampers will open to minimum position. The AHU status, OA dampers, MAT, RAT, DAT, heating water valve, chilled water valve, and space temperatures will be trended a two week period to assure the units are off when specified. Trends will be recorded during the winter season to verify the unit will operate when the outdoor air temperature is too cold, the unit turns on to bring the required space to unoccupied set point. The morning warmup routine will be seen in the trends as well. The units now operate 7am - 9pm M-F and are off weekends. This measure has been implemented. None required 32