NA7.5.1.1 Variable Air Volume Systems Outdoor Air Acceptance
Prior to functional testing, verify and document the following:
(a) Sensor used to control outdoor air flow is either factory calibrated or field calibrated.
(b) Attach calibration certification or results.
(c) Dynamic damper control is being used to control outside air.
(d) Specify the type of dynamic control being utilized to control outside air.
(e) Specify the method of delivering outside air to the unit.
(f) Pre-occupancy purge has been programmed for the 1-hour period immediately before the building is normally occupied.
Step 1: If the system has an outdoor air economizer, force the economizer high limit to disable economizer control (e.g. for a fixed drybulb high limit, lower the setpoint below the current outdoor air temperature).
Step 2: Adjust supply airflow to achieve design airflow or maximum airflow at full cooling. Verify and document the following:
(a) Measured outside airflow reading is within 10 percent of the total ventilation air called for in the Certificate of Compliance.
(b) Outside air damper position stabilizes within 5 minutes.
Step 3: Adjust supply airflow to either the sum of the minimum zone airflows, full heating, or 30 percent of the total design airflow. Verify and document the following:
(a) Measured outside airflow reading is within 10 percent of the total ventilation air called for in the Certificate of Compliance.
(b) Outside air damper position stabilizes within 5 minutes.
Step 4: Restore system to “as-found” operating conditions
NA7.5.1.2 Constant Volume System Outdoor Air Acceptance
Prior to Functional Testing, verify and document the following:
(a) System is designed to provide a fixed minimum OSA when the unit is on.
(b) Specify the method of delivering outside air to the unit.
(c) Pre-occupancy purge has been programmed for the 1-hour period immediately before the building is normally occupied.
(d) Minimum position is marked on the outside air damper.
(e) The system has means of maintaining the minimum outdoor air damper position.
Step 1: If the system has an outdoor air economizer, force the economizer to the minimum position and stop outside air damper modulation (e.g. for a fixed drybulb high limit, lower the setpoint below the current outdoor air temperature)
(a) Measured outside airflow reading is within 10 percent of the total ventilation air called for in the Certificate of Compliance.
NA7.5.2.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Thermostat is located within the space-conditioning zone that is served by the HVAC system.
(b) Thermostat meets the temperature adjustment and dead band requirements of Standards §120.2(b).
(c) Occupied, unoccupied, and holiday schedules have been programmed per the facility’s schedule.
(d) Pre-occupancy purge has been programmed to meet the requirements of Standards §120.1(c)2.
NA7.5.2.2 Functional Testing
Step 1: Disable economizer and demand control ventilation systems (if applicable).
Step 2: Simulate a heating demand during the occupied condition. Verify and document the following:
(a) Supply fan operates continually.
(b) The unit provides heating.
(c) No cooling is provided by the unit.
(d) Outside air damper is at minimum position.
Step 3: Simulate operation in the dead band during occupied condition. Verify and document the following:
(e) Supply fan operates continually.
(f) Neither heating nor cooling is provided by the unit.
(g) Outside air damper is at minimum position.
Step 4: Simulate cooling demand during occupied condition. Lock out economizer (if applicable). Verify and document the following:
(h) Supply fan operates continually.
(i) The unit provides cooling.
(j) No heating is provided by the unit.
(k) Outside air damper is at minimum position.
Step 5: Simulate operation in the dead band during unoccupied mode. Verify and document the following:
(l) Supply fan is off.
(m) Outside air damper is fully closed.
(n) Neither heating nor cooling is provided by the unit.
Step 6: Simulate heating demand during unoccupied conditions. Verify and document the following:
(o) Supply fan is on (either continuously or cycling).
(p) Heating is provided by the unit.
(q) No cooling is provided by the unit.
(r) Outside air damper is either closed or at minimum position.
Step 7: Simulate cooling demand during unoccupied condition. Lock out economizer (if applicable). Verify and document the following:
(s) Supply fan is on (either continuously or cycling).
(t) Cooling is provided by the unit.
(u) No heating is provided by the unit.
(v) Outside air damper is either closed or at minimum position.
Step 8: Simulate manual override during unoccupied condition. Verify and document the following:
(w) System operates in “occupied” mode.
(x) System reverts to “unoccupied” mode when manual override time period expires.
Step 9: Restore economizer and demand control ventilation systems (if applicable), and remove all system overrides initiated during the test.
NA7.5.3.1 Construction Inspection
Prior to Functional Testing on new duct systems, verify and document the following:
(a) Duct connections meet the requirements of Standards §120.4.
(b) Specify choice of drawbands.
(c) Flexible ducts are not constricted in any way.
(d) Duct leakage tests shall be performed before access to ductwork and connections are blocked.
(e) Joints and seams are properly sealed according to the requirements of Standards §120.4.
(f) Joints and seams are not sealed with cloth back rubber adhesive tape unless used in combination with Mastic and drawbands. Cloth backed tape may be used if tape has been approved by the CEC. Ducts are fully accessible for testing.
(g) Insulation R-Values meet the minimum requirements of §120.4(a).Insulation is protected from damage and suitable for outdoor service if applicable per Standards §120.4(f).
Prior to Functional Testing on all new and existing duct systems, visually inspect to verify that the following locations have been sealed:
(h) Connections to plenums and other connections to the forced air unit
(i) Refrigerant line and other penetrations into the forced air unit
(j) Air handler door panel (do not use permanent sealing material, metal tape is acceptable)
(k) Register boots sealed to surrounding material
(l) Connections between lengths of duct, as well as connections to takeoffs, wyes, tees, and splitter boxes
NA7.5.3.2 Functional Testing
Step 1: Perform duct leakage test as specified by Reference Nonresidential Appendix NA2 to verify the duct leakage conforms to the requirements of Standards §140.4(l) and §141.0(b)2D.
Step 2: Obtain HERS Rater field verification as specified in Reference Nonresidential Appendix NA1.
NA7.5.4.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Economizer high limit shutoff control complies with Table 140.4-B of Section140.4(e)3.
(b) If the high-limit control is fixed dry-bulb or fixed enthalpy + fixed dry-bulb, it shall have an adjustable setpoint.
(c) Economizer lockout control sensor is located to prevent false readings.
(d) Sensor performance curve is provided by factory with economizer instruction material.
(e) Sensor output value measured during sensor calibration is plotted on the performance curve.
(f) Economizer damper moves freely without binding.
(g) Unitary systems with an economizer have control systems, including two-stage or electronic thermostats, that cycle compressors off when economizers can provide partial cooling
(h) Economizer reliability features are present per Standards Section 140.4(e)4.
(i) System is designed to provide up to 100 percent outside air without over-pressurizing the building.
(j) For systems with DDC controls lockout sensor(s) are either factory calibrated or field calibrated.
(k) For systems with non-DDC controls, manufacturer’s startup and testing procedures have been applied.
(l) Provide an economizer specification sheet proving capability of at least 60,000 actuations.
(m) Provide a product specification sheet proving compliance with AMCA Standard 500 damper leakage at 10 cfm/sf.
NA7.5.4.2 Functional Testing
Step 1: Disable demand control ventilation systems (if applicable).
Step 2: Enable the economizer and simulate a cooling demand large enough to drive the economizer fully open. Verify and document the following:
(a) Economizer damper is 100 percent open and return air damper is 100 percent closed.
(b) All applicable fans and dampers operate as intended to maintain building pressure.
(c) The unit heating is disabled (if unit has heating capability).
Step 3: Disable the economizer and simulate a cooling demand. Verify and document the following:
(d) Economizer damper closes to its minimum position.
(e) All applicable fans and dampers operate as intended to maintain building pressure.
(f) The unit heating is disabled (if unit has heating capability).
Step 4: If unit has heating capability, simulate a heating demand and set the economizer so that it is capable of operating (i.e. actual outdoor air conditions are below lockout setpoint). Verify the following:
(g) The economizer is at minimum position
(h) Return air damper opens
Step 5: Turn off the unit. Verify and document the following:
(i) Economizer damper closes completely.
Step 6: Restore demand control ventilation systems (if applicable) and remove all system overrides initiated during the test.
NA7.5.5.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Carbon dioxide control sensor is factory calibrated per §120.1(c)4.
(b) The sensor is located in the high density space between 3 ft and 6 ft above the floor or at the anticipated level of the occupants’ heads.
(c) DCV control setpoint is at or below the CO2 concentration permitted by §120.1(c)4.C.
NA7.5.5.2 Functional Testing
Step 1: Disable economizer controls
Step 2: Simulate a signal at or slightly above the CO2 concentration setpoint required by §120.1(c)4.C. Verify and document the following:
(a) For single zone units, outdoor air damper modulates open to satisfy the total ventilation air called for in the Certificate of Compliance.
(b) For multiple zone units, either outdoor air damper or zone damper modulate open to satisfy the zone ventilation requirements.
Step 3: Simulate signal well below the CO2 setpoint. Verify and document the following:
(c) For single zone units, outdoor air damper modulates to the design minimum value.
(d) For multiple zone units, either outdoor air damper or zone damper modulate to satisfy the reduced zone ventilation requirements.
Step 4: Restore economizer controls and remove all system overrides initiated during the test.
Step 5: With all controls restored, apply CO2 calibration gas at a concentration slightly above the setpoint to the sensor. Verify that the outdoor air damper modulates open to satisfy the total ventilation air called for in the Certificate of Compliance.
NA7.5.6.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Supply fan includes device(s) for modulating airflow, such as variable speed drive or electrically commutated motor.
(b) For multiple zone systems:
1. Discharge static pressure sensors are either factory calibrated or field-calibrated.
2. The static pressure location, setpoint, and reset control meets the requirements of §140.4(c)2.B and §140.4(c)2.C.
NA7.5.6.2 Functional Testing
Step 1: Simulate demand for full design airflow. Verify and document the following:
(a) Supply fan controls modulate to increase capacity.
(b) For multiple zone systems, supply fan maintains discharge static pressure within +/-10 percent of the current operating setpoint.
(c) Supply fan controls stabilize within a 5 minute period.
Step 2: Simulate demand for reduced or minimum airflow. Verify and document the following:
(d) Supply fan controls modulate to decrease capacity.
(e) Current operating setpoint has decreased (for systems with DDC to the zone level).
(f) For multiple zone systems, supply fan maintains discharge static pressure within +/-10 percent of the current operating setpoint.
(g) Supply fan controls stabilize within a 5 minute period.
Step 3: Restore system to correct operating conditions
NA7.5.7.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Valve and piping arrangements were installed per the design drawings.
NA7.5.7.2 Functional Testing
Step 1: For each of the pumps serving the distribution system, dead head the pumps using the discharge isolation valves at the pumps. Document the following:
(a) Record the differential pressure across the pumps.
(b) Verify that this is within 5 percent of the submittal data for the pump.
Step 2: Reopen the pump discharge isolation valves. Automatically close all valves on the systems being tested. If 3-way valves are present, close off the bypass line. Verify and document the following:
(c) The valves automatically close.
(d) Record the pressure differential across the pump.
(e) Verify that the pressure differential is within 5 percent of the reading from Step 1 for the pump that is operating during the valve test.
Step 3: Restore system to correct operating conditions.
NA7.5.8.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Supply water temperature sensors have been either factory or field calibrated.
NA7.5.8.2 Functional Testing
Step 1: Change reset control variable to its maximum value. Verify and document the following:
(a) Chilled or hot water temperature setpoint is reset to appropriate value.
(b) Verify that actual supply temperature changes to within 2 percent of the new setpoint.
Step 2: Change reset control variable to its minimum value. Verify and document the following:
(c) Chilled or hot water temperature setpoint is reset to appropriate value.
(d) Verify that actual supply temperature changes to within 2 percent of the new setpoint.
Step 3: Restore reset control variable to automatic control. Verify and document the following:
(e) Chilled or hot water temperature set-point is reset to appropriate value.
(f) Verify that actual supply temperature changes to within 2 percent of the newl setpoint.
NA7.5.9.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) The static pressure location, setpoint, and reset control meets the requirements of the Standards Section 140.4(k)6B.
(b) Pressure sensors are either factory or field calibrated.
NA7.5.9.2 Functional Testing
Step 1: Modulate control valves to reduce water flow to 50 percent of the design flow or less, but not lower than the pump minimum flow. Verify and document the following:
(a) Pump operating speed decreases (for systems with DDC to the zone level).
(b) Current operating setpoint has not increased (for all other systems that are not DDC).
(c) System pressure is within 5 percent of current operating setpoint.
(d) System operation stabilizes within 5 minutes after test procedures are initiated.
Step 2: Open control valves to increase water flow to a minimum of 90 percent design flow. Verify and document the following:
(e) Pump speed increases
(f) Pumps are operating at 100 percent speed.
(g) System pressure is greater than the setpoint in Step 1.
(h) System pressure is either within ±5 percent of current operating setpoint. System operation stabilizes within 5 minutes after test procedures are initiated.
Step 3: Restore system to correct operating conditions.
NA7.5.10.1 Construction Inspection
Prior to Acceptance Testing, verify and document the following:
(a) That the EMCS interface enables activation of the central demand shed controls.
NA7.5.10.2 Functional Testing
Step 1: Engage the global demand shed system. Verify and document the following:
(a) That the cooling setpoint in non-critical spaces increases by the proper amount.
(b) That the cooling setpoint in critical spaces do not change.
Step 2: Disengage the global demand shed system. Verify and document the following:
(c) That the cooling setpoint in non-critical spaces return to their original values.
(d) That the cooling setpoint in critical spaces do not change.
NA7.5.11.1 Construction Inspection
Prior to Functional Testing, verify and document the following:
(a) Verify fault detection and diagnostics (FDD) hardware is installed on HVAC unit.
(b) Verify the FDD system matches the make and model reported on the design drawings.
(c) Verify the following air temperature sensors are permanently installed:
1. outside air
2. supply air
3. return air
(d) Verify the controller has the capability of displaying the value of the following parameters:
4. Air temperatures: outside air, supply air, return air.
5. Refrigerant pressure and temperature sensors (if present, their output should be made available).
(e) Verify the controller provides system status by indicating the following conditions:
6. Free cooling available
7. Economizer enabled
8. Compressor enabled
9. Heating enabled
10. Mixed air low limit cycle active
NA7.5.11.2 Functional Testing
For each HVAC unit to be tested, complete the following:
Step 1: Verify the FDD system indicates normal operation.
Step 2: Disconnect outside air temperature sensor from unit controller. Verify and document the following:
(a) FDD system reports a fault.
Step 3: Connect outside air temperature sensor to unit controller. Verify and document the following:
(b) FDD system indicates normal operation.
Step 1: Coordinate this test with NA7.5.1 Outdoor Air
(a) If NA7.5.1 Outdoor Air passes, verify FDD system indicates normal operation.
Step 1: Interfere with normal unit operation so test NA7.5.4 Air Economizer Controls fails by immobilizing the outdoor air economizer damper according to manufacturer’s instructions
(a) After NA7.5.4 Air Economizer Controls fails, verify FDD system reports a fault.
Step 2: Successfully complete and pass NA7.5.4 Air Economizer Controls
(b) After NA7.5.4 Air Economizer Controls passes, verify FDD system reports normal operation.
Step 1: During normal cooling operation, record refrigerant temperatures and pressures, and saturated discharge temperature and saturated suction temperature, if displayed by the unit controller.
Step 2: During same operating conditions as Step 1, install calibrated refrigerant gauge with an accuracy of plus or minus 3% shall be used to determine and record saturated discharge temperature and saturated suction temperatures. If either temperature determined is more than 5 F different than recorded in Step 1, test has failed. Otherwise, test passes.
(a) Refrigeration gauges shall be calibrated according to the manufacturer’s calibration procedure to conform to the accuracy requirement specified. All testers performing diagnostic tests shall obtain evidence from the manufacturer that the equipment meets the accuracy specifications. The evidence shall include equipment model, serial number, the name and signature of the person of the test laboratory verifying the accuracy, and the instrument accuracy. All diagnostic testing equipment is subject to re-calibration when the period of the manufacturer’s guaranteed accuracy expires.
NA7.5.12.1 Functional Testing for Air Handling Units
Testing of each AHU with FDD controls shall include the following tests.
(a) Sensor drift/failure:
Step 1: Disconnect outside air temperature sensor from unit controller.
Step 2: Verify that the FDD system reports a fault.
Step 3: Connect OAT sensor to the unit controller.
Step 4: Verify that FDD indicates normal system operation.
(b) Damper/actuator fault:
Step 1: From the control system workstation, command the mixing box dampers to full open (100 percent outdoor air).
Step 2: Disconnect power to the actuator and verify that a fault is reported at the control workstation.
Step 3: Reconnect power to the actuator and command the mixing box dampers to full open.
Step 4: Verify that the control system does not report a fault.
Step 5: From the control system workstation, command the mixing box dampers to a full-closed position (0 percent outdoor air),
Step 6: Disconnect power to the actuator and verify that a fault is reported at the control workstation.
Step 7: Reconnect power to the actuator and command the dampers closed.
Step 8: Verify that the control system does not report a fault during normal operation.
(c) Valve/actuator fault:
Step 1: From the control system workstation, command the heating and cooling coil valves to full open or closed, then disconnect power to the actuator and verify that a fault is reported at the control workstation.
(d) Inappropriate simultaneous heating, mechanical cooling, and/or economizing:
Step 1: From the control system workstation, override the heating coil valve and verify that a fault is reported at the control workstation.
Step 2: From the control system workstation, override the cooling coil valve and verify that a fault is reported at the control workstation.
Step 3: From the control system workstation, override the mixing box dampers and verify that a fault is reported at the control workstation.
NA7.5.12.2 Functional Testing for Zone Terminal Units
Testing shall be performed on one of each type of terminal unit (VAV box) in the project. A minimum of 5 percent of the terminal boxes shall be tested.
(a) Sensor drift/failure:
Step 1: Disconnect the tubing to the differential pressure sensor of the VAV box.
Step 2: Verify that control system detects and reports the fault.
Step 3: Reconnect the sensor and verify proper sensor operation.
Step 4: Verify that the control system does not report a fault.
(b) Damper/actuator fault:
1. Damper stuck open.
Step 1: Command the damper to be fully open (room temperature above setpoint).
Step 2: Disconnect the actuator to the damper.
Step 3: Adjust the cooling setpoint so that the room temperature is below the cooling setpoint to command the damper to the minimum position. Verify that the control system reports a fault.
Step 4: Reconnect the actuator and restore to normal operation.
2. Damper stuck closed.
Step 1: Set the damper to the minimum position.
Step 2: Disconnect the actuator to the damper.
Step 3: Set the cooling setpoint below the room temperature to simulate a call for cooling. Verify that the control system reports a fault.
Step 4: Reconnect the actuator and restore to normal operation.
(c) Valve/actuator fault (For systems with hydronic reheat):
Step 1: Command the reheat coil valve to (full) open.
Step 2: Disconnect power to the actuator. Set the heating setpoint temperature to be lower than the current space temperature, to command the valve closed. Verify that the fault is reported at the control workstation.
Step 3: Reconnect the actuator and restore normal operation.
(d) Feedback loop tuning fault (unstable airflow):
Step 1: Set the integral coefficient of the box controller to a value 50 times the current value.
Step 2: The damper cycles continuously and airflow is unstable. Verify that the control system detects and reports the fault.
Step 3: Reset the integral coefficient of the controller to the original value to restore normal operation.
(e) Disconnected inlet duct:
Step 1: From the control system workstation, commands the damper to full closed, then disconnect power to the actuator and verify that a fault is reported at the control workstation.
(f) Discharge air temperature sensor:
Step 1: Adjust zone setpoints to drive the box from dead band to full heating.
Step 2: Verify that in heating, the supply air temperature resets up to the maximum setpoint while the airflow is maintained at the dead band flow rate.
Step 3: Verify that after the supply air temperature is reset up to the maximum setpoint, the airflow rate then increases up to the heating maximum flow rate in order to meet the heating load.
These acceptance requirements apply only to constant or variable volume, direct expansion (DX) systems with distributed energy storage (DES/DXAC). These acceptance requirements are 'in 'addition to those for other systems or equipment such as economizers, packaged equipment, etc.
NA7.5.13.1 Construction Inspection
Prior to Performance Testing, verify and document the following:
(a) The water tank is filled to the proper level.
(b) The water tank is sitting on a foundation with adequate structural strength.
(c) The water tank is insulated and the top cover is in place.
(d) The DES/DXAC is installed correctly (refrigerant piping, etc.).
(e) Verify that the correct model number is installed and configured.
NA7.5.13.2 Equipment Testing
Step 1: Simulate cooling load during daytime period (e.g. by setting time schedule to include actual time and placing thermostat cooling set-point below actual temperature). Verify and document the following:
(a) Supply fan operates continually.
(b) If the DES/DXAC has cooling capacity, DES/DXAC runs to meet the cooling demand (in ice melt mode).
(c) If the DES/DXAC has no ice and there is a call for cooling, the DES/DXAC runs in direct cooling mode.
Step 2: Simulate no cooling load during daytime condition. Verify and document the following:
(d) Supply fan operates as per the facility thermostat or control system.
(e) The DES/DXAC and the condensing unit do not run.
Step 3: Simulate no cooling load during morning shoulder time period. Verify and document the following:
(f) The DES/DXAC is idle.
Step 4: Simulate a cooling load during morning shoulder time period. Verify and document the following:
(g) The DES/DXAC runs in direct cooling mode.
NA7.5.13.3 Calibrating Controls
Set the proper time and date, as per manufacturer’s installation 'manual for approved installers.
The following acceptance tests apply to thermal energy storage systems that are used in conjunction with chilled water air conditioning systems.
NA7.5.14.1 Eligibility Criteria
The following types of TES systems are eligible for compliance credit:
(a) Chilled Water Storage
(b) Ice-on-Coil Internal Melt
(c) Ice-on-Coil External Melt
(d) Ice Harvester
(e) Brine
(f) Ice-Slurry
(g) Eutectic Salt
(h) Clathrate Hydrate Slurry (CHS)
(i) Cryogenic
(j) Encapsulated (e.g. Ice Balls)
The following Certificate of Compliance information for both the chiller and the storage tank shall be provided on the plans to document the key TES System parameters and allow plan check comparison to the inputs used in the the compliance software.
Chiller:
(k) Brand and Model
(l) Type (Centrifugal, Reciprocating, Other)
(m) Heat Rejection Type (Air, Water, Other)
(n) Charge Mode Capacity (Tons)
(o) Discharge Mode Capacity (Tons)
(p) Discharge Mode Efficiency (kW/Ton or EER)
(q) Charge Mode Efficiency (kW/Ton or EER)
(r) Fluid Type and Percentage
Storage Tank:
(s) Brand and Model
(t) Number of Tanks
(u) Storage Capacity per Tank (ton-hours)
(v) Storage Rate (tons)
(w) Minimum Charging Temperature
(x) Discharge Rate (tons)
NA7.5.14.2 Functional Testing
Acceptance testing also shall be conducted and documented on the Certificate of Acceptance in two parts:
In the TES System Design Verification part, the installing contractor shall certify the following information, which verifies proper installation of the TES System consistent with system design expectations:
(a) Chiller(s) start-up procedure has been completed
(b) System fluid test and balance has been completed
(c) Air separation and purge has been completed
(d) Fluid (e.g. glycol) has been verified at the concentration and type indicated on the design documents
(e) The TES system has been fully charged at least once and charge duration noted
(f) The system has been partially discharged at least once and discharge duration noted
(g) The system is in a partial charge state in preparation for step 2 tests
(h) Schedule of operation has been activated as designed
(i) Mode documentation describes the state of system components in each mode of operation
In the TES System Controls and Operation Verification part, the installing contractor also shall complete the following acceptance testing to ensure the TES System is controlled and operates consistent with the compliance simulation. The installing contractor shall convey the results of the testing to the enforcement agency using the Certificate of Acceptance.
(a) Verify that the TES system and the chilled water plant is controlled and monitored by an energy management system (EMS).
(b) Indicate the method of simulation that will be used during the test. Either manual selection of each operating mode or the use of an EMS by inputting the schedule as indicated by the designer.
(c) Storage/charge mode. Manually select storage mode. Verify that the TES system stores energy. If scheduled, input the time interval that would result in storage/charge mode. Verify that the TES system stores energy.
(d) End of charge signal. Simulate a full storage charge by changing the (manufacturer recommended) thermal storage end of charge output sensor to the EMS. Verify that the storage charging has stopped.
(e) Discharge mode. Generate a call for cooling. Manually select storage only discharge mode. Verify that the TES system starts discharging with the compressors off. Return to the off/secured mode. If scheduled, input the time interval that would result in discharge mode and verify that the storage starts discharging with the compressors off. .
(f) Mechanical cooling only mode. Generate a call for cooling. Manually select mechanical cooling only mode and verify that the storage does not discharge and the cooling load is met by the compressor only. Return to the off/secure mode. If scheduled, input the time interval that would result in mechanical cooling only mode and verify that the storage does not discharge and the cooling load is met by the compressor only.
(g) Discharge and mechanical cooling mode. Generate a call for cooling. Manually select discharge and mechanical cooling mode and verify that the TES system discharges with the compressor sharing the load. If scheduled, input the time interval that would result in discharge and mechanical cooling mode and verify that the storage starts discharging with the compressor sharing the load.
(h) Off/storage-secured mode. Manually select the off/storage-secured mode and verify that the storage does not discharge and all compressors are off, regardless of the presence of calls for cooling. If scheduled, input the time interval that would result in off/storage-secured mode and verify that the storage does not discharge and all compressors are off, regardless of the presence of calls for cooling.
(i) Charge plus cool mode. If provisions for this mode have been made by the system designer, verify that the tank(s) can be charged while serving an active cooling load, simulated by generating a call for cooling and entering the charge mode either manually or by time schedule. If the system disallows this mode of operation, verify that the energy storage is disallowed or discontinued while an active cooling load is present.
The following acceptance tests apply to supply air temperature reset controls.
NA7.5.15.1 Construction Inspection
Prior to functional testing, verify and document the following:
(a) Supply air temperature reset controls are installed per the requirements of the 2013 Building Energy Efficiency Standards Section 140.4(f).
(b) All system air temperature sensors are factory or field calibrated within 2% of a calibrated reference temperature sensor. Attach a copy of the calibration certificate or field verification results.
(c)
(d) Document current supply air temperature.
NA7.5.15.2 Functional Testing
(a) Check to make sure that chilled and hot water coils, if used, are not already fully open and calling for maximum cooling/heating. If this is the case, reverse Steps 1 and 2 and/or change the setpoint range as necessary to conduct this test.
(b) Identify the reset controller parameter.
Step 1: During occupied mode, adjust the reset control parameter to decrease the supply air temperature (to the lower supply temperature limit). Verify and document the following:
(c) Supply air temperature controls modulate as intended .
(d) Actual supply air temperature decreases to meet the new setpoint within ±2ºF.
(e) Supply air temperature stabilizes within 15 minutes.
Step2: During occupied mode, adjust the reset control parameter to increase the supply air temperature (to the upper supply temperature limit). Verify and document the following:
(f) Supply air temperature controls modulate as intended.
(g) Actual supply air temperature increases to meet the new setpoint within ±2ºF.
(h) Supply air temperature stabilizes within 15 minutes.
Step 3: Restore reset control parameter to automatic control. Verify and document the following:
(i) Supply air temperature controls modulate as intended.
(j) Actual supply air temperature changes to meet the new setpoint within ±2ºF.
(k) Supply air temperature stabilizes within 15 minutes.
The following acceptance tests apply to condenser water temperature reset controls.
NA7.5.16.1 Construction Inspection
Prior to functional testing, verify and document the following:
(a) Condenser water supply system, control system, and temperature control sequence, including condenser water supply high and low limits, are available and documented in the building documents.
(b) Cooling tower fan motors are operational, and cooling tower fan speed controls (e.g. VSDs) are installed, operational, and connected to cooling tower fan motors per Original Equipment Manufacturer (OEM) start-up manuals and sequence of operation.
(c) Cooling tower fan control sequence, including tower design wetbulb temperature and approach, is available and documented in the building documents.
(d) The following temperature sensors are installed per plans: outdoor air dry-bulb, outdoor air wet-bulb, entering condenser water, and leaving chilled water. Note any discrepancies.
(e) All ambient dry bulb temperature, relative humidity, and pressure sensors used by controller are factory calibrated within 2% of a calibrated reference sensor. Attach a copy of calibration certificate or field verification results.
(f) Document the current outdoor air dry bulb and wet bulb temperatures, entering condenser water temperature, and leaving chilled water temperature readings from the control system.
NA7.5.16.2 Functional Testing
(a) The system cooling load must be sufficiently high to run the test. If necessary, artificially increase the evaporator load to perform the functional tests, or wait until a time of stable chiller operation. If necessary, reverse Steps 1 and 2 in the test based on atmospheric conditions and buildings loads.
(b) If testing in cold ambient conditions, ensure that freeze protection controls are installed and functional to prevent equipment damage.
(c) If the actual control sequence differs significantly from that implied by the tests and/or has already been tested during the building commissioning process, attach a description of the control sequence, a description of the tests that were done to verify the system operates according to the sequence, the test results, and a plot of associated trend data.
(d) Identify the reset control parameter.
Step 1: Adjust the reset control parameter to decrease the condenser water supply temperature toward the lower supply temperature limit. Allow time for the system to stabilize. Verify and document the following:
(a) Condenser water supply temperature controls modulate as intended.
(b) Actual condenser water supply temperature decreases to meet the new setpoint within ±2ºF.
(c) Cooling tower fan(s) stage properly and/or adjust speed accordingly to meet higher setpoint.
(d) Chiller load amperage decrease.
Step 2: Adjust the reset control parameter to increase the condenser water supply temperature toward the upper supply temperature limit.
Verify and document the following:
(e) Condenser water supply temperature controls modulate as intended.
(f) Actual condenser water supply temperature increases to meet the new setpoint within ±2ºF.
(g) Cooling tower fan(s) stage properly and/or adjust speed accordingly to meet the lower setpoint.
(h) Chiller load amperage increase.
Step 3: Restore reset control parameter to automatic control. Verify and document the following:
(i) Condenser water supply temperature controls modulate as intended.
(j) Actual condenser water supply temperature changes to meet the new setpoint.
(k) Cooling tower fan(s) and chiller(s) stage properly and/or adjust speed accordingly to return to normal operation and meet the setpoint.