IFB 121C-22 SECTION 15601 ROOFTOP EQUIPMENT PRE-PURCHASE SPECIFICATION.pdf

Z94PS07 TO#19

June 21, 2022

ROOFTOP EQUIPMENT PRE-PURCHASE

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SECTION 15601

ROOFTOP EQUIPMENT

PRE-PURCHASE

PART 1 - GENERAL

1.1 DESCRIPTION OF WORK

A. This specification is for the procurement of mechanical rooftop equipment only at the following MBTA bus maintenance facilities: Arborway Bus Facility 3600 Washington St. Jamaica Plain, MA 02130, Southampton Bus Facility 236 Southampton St. Boston, MA 02118, Charlestown Bus Facility 21 Arlington Ave. Charlestown, MA 02129.

B. Please refer to the (3) three accompanying drawings: for existing equipment technical schedules, locations, and quantities.

1. Attachment A_Drawing #1 Arborway Bus Maintenance Facility

2. Attachment B_Drawing # 2 Southampton Bus Maintenance Facility

3. Attachment C_Drawing # 3 Charlestown Bus Maintenance Facility

C. The units will be installed by a separate contractor and the awarded manufacturer shall provide support services outlined in this specification.

D. Definitions:

1. Installation contract – MBTA will advertise and award project, which involves the installation of gas fired makeup units and packaged roof top units as specified in this SECTION. The manufacturer will work with the firm awarded the installation contract as outlined in this procurement specification.

2. Installation contractor – The authority’s general contractor and subcontractors who are awarded the installation contract.

3. ATC – the automatic controls contractor hired by the installation contractor.

4. Authority/Owner – Massachusetts Bay Transit Authority

1.2 PRE-PROPOSAL SITE VISIT

A. Prior to submission to the authority, a pre-proposal Site Visit will take place on August 30, 2022, at

9:00am beginning at the Charlestown Bus Facility; the group will travel to Arborway Bus Facility and finish at the Southampton Bus Facility. Bidders are asked to confirm attendance for the pre-proposal visits by emailing jmiele@mbta.com. Once confirmed, on-site details will be provided. Access to the existing units will be provided. This visit will allow bidders to measure and inspect the existing units.

The manufacturer’s representative is responsible for the exact measurement of the existing roof curbs and required clearances.

B. During inspection if there are any discrepancies between the procurement documents and what is noted in the field, the manufacturer is responsible for letting the authority and the engineer know in writing.

mailto:jmiele@mbta.com mailto:jmiele@mbta.com

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1.3 IFB SUBMITTALS

A. Submit the following information for each unit for evaluation:

1. Unit Drawings

a. Unit Outline Drawing – Drawing provided should show unit dimensions and any additional adaptor curb that may be needed.

b. Include details of equipment assemblies. Indicate dimensions, weights, loads, center of gravity, required clearances, components, and location and size of each field connection.

Manufacturer to provide unit clearance with respect to existing conditions.

c. Detail fabrication and assembly of gas-fired heating and ventilating units, as well as procedures and diagrams.

2. Product Data: all submittals shall be clearly packaged with the following information provided.

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a. Shop drawings shall clearly identify support locations to be used by installing contractor.

Support locations shall be coordinated such that access to unit’s doors, etc. are not infringed.

b. Equipment descriptions and performance data

c. Include diagrams for power, signal, and control wiring.

3. Information Submittals

a. Equipment warranty: Provide extended 2-year warranty.

b. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.

c. Equipment Factory Testing Procedures

4. Bid Price and Lead Time information. See Attachment D – Bus Facility HVAC System Upgrades

– Estimate – FOR INFO Only.

1.4 MODIFICATIONS IN LAYOUT

A. No modifications to the roof openings will be made during install. The manufacturer must work with existing openings and provide adaptor curbs as required.

1.5 DELIVERY, STORAGE, AND HANDLING

A. All equipment shall be delivered to the authority at each individual site. The manufacturer shall work with the authority on the exact location of delivery. Equipment shall be suitably packaged and protected for overland trucking using heavy-duty protective shrink-wrap plastic. All necessary components shall be provided to protect the unit from damage upon delivery and for the storage of the unit. Manufacturer is responsible for the shipping and delivery at a final delivery date as determined by the authority. Unit to be stored at grade. All items shipped loose such as filters, assemblies, controls, caulking, etc. shall be itemized on the packing slip and be suitably secured in the unit or on a separate pallet.

B. Delivery date will be 24-28 weeks following executed contract.

PART 2 - GENERAL

2.1 PACKAGED, AIR COOLED, DX ROOFTOP UNITS (ACU)

A. General Requirements

1. Provide where shown on drawings, a completely factory assembled, piped, wired, and tested, rooftop heating and cooling unit (as indicated on plans). Unit shall have a full charge of refrigerant, and compressor oil. The rooftop unit shall be shipped in one piece and shall have a single point power connection.

2. Units shall comply with ASHRAE Standard 90.1, 2016 edition paragraph 6.1.1.3

3. The units shall match the existing curbs. It shall be the responsibility of the manufacturer’s representative to field verify existing roof curbs. Manufacturer to provide adaptor curbs as required.

4. The unit’s weight shall not exceed 10% of the existing unit’s weight.

5. The units shall match the electrical characteristics of the existing units with equal or lower power requirement.

6. Acceptable Manufacturers shall be Daikin, Carrier, Trane, JCI, or approved equal.

a. Provided that they meet the requirements of this specification and the performance requirements listed in the equipment schedules. Note particularly the following items.

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b. The submitted rooftop unit must produce the CFM listed in the schedule, at the static pressure, external to the unit, listed in the schedule. This performance must be accomplished using equal or less fan horsepower than the scheduled unit and at an evaporator coil face velocity equal or less than the scheduled unit.

c. The discharge air temperatures listed in the schedule are at the discharge of the unit into the supply ductwork, NOT the discharge temperatures at the evaporator coil. These temperatures must be produced by the submitted unit. Draw through rooftop manufacturers must fully account for fan heat gain in determining their discharge temperatures.

d. The scheduled sensible and total loads, listed in the schedules, are based on actual calculation, not manufacturer's catalog data. Both loads must be met at the outdoor air and return air temperature, to the unit, listed in the schedules.

e. The rooftop unit shown on the drawings has been coordinated with architectural and structural elements, and with electrical service requirements. If the replacement units do not match exactly the existing curbs and roof openings, the manufacturer shall provide a curb adapter.

B. Submittal Requirements

1. This paragraph supplements the "Submittals" paragraph, in Part One of these specifications. In addition to complying with all submittal requirements contained in Part One, the rooftop unit submittal shall contain ALL performance and other items listed in the schedule, as well as:

a. The air temperatures, entering and leaving the evaporator coil.

b. The temperature gain in degrees, due to the return (or exhaust) and supply fan.

c. The component pressure drops of all items internal to the unit i.e., coils, filters, dampers, furnaces etc.

C. Quality Assurance

1. Rooftop unit shall be rated in accordance with ARI Standard 360. Unit shall be capable of starting and running at 115 degrees F ambient outdoor temperature per the maximum load criteria of ARI Standard 360. Unit shall be capable of mechanical cooling down to 55 degrees F ambient temperature.

2. Unit shall be designed to conform to ANSI B9.1 Safety Code and the National Electrical Code.

3. Air cooled condenser coils shall be factory leak tested at minimum of 150 psig and pressure tested at 450 psig. Evaporator coils shall be factory pressure and leak tested at minimum 300 psig.

4. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke generation.

5. All fan shaft bearings shall have a life of 200,000 hours at design operating conditions in accordance with ANSI B3.15.

6. Units shall be equipped with controls and devices for 100% economizer operation

D. Equipment Requirements

1. Unit Casing

a. Casing shall be weatherproof. If rooftop unit casing is found to leak after it is installed, within the warrantee period, then whatever modifications to the unit are required to make the casing watertight shall be made, under the work of the mechanical section, within the original contract price.

b. Hinged, insulated, access doors, which are capable of being secured and locked in the open position, shall be provided on both sides of the casing, to allow access to all fans and drives, coils, and all filters. It shall not be necessary to remove any bolts to open the

15601 - 5 access doors. A hinged, lockable panel shall also be provided for the control cabinet. If this cabinet is external to the unit casing it shall be NEMA 3R (rainproof). All hinged panels shall be provided with suitable gasketing to prevent moisture leakage. Easily removable man-sized access panels shall also be provided for the condensing unit section).

c. All interior surfaces exposed to the moving airstream shall be coated with insulation having R Value compliant with 2018 IECC. On units without internal casing sheet metal liner, the glass fiber insulation shall be coated on the airstream side to minimize erosion.

Insulation adhesive shall maintain satisfactory adhesion over a range of 20°F to 180°F.

d. Unit casing shall be equipped with lifting lugs to facilitate overhead rigging.

2. Fans

a. Evaporator and Return/Exhaust Fans:

1). Evaporator and return/exhaust fans shall be statically and dynamically balanced.

2). Supply, Return and Exhaust fans shall have factory mounted piezo rings for flow readings. Provide flow verses DP charts to both the controls and balancing contractors.

3). For base mounted fans, provide spring type vibration isolators under the fan sled with a minimum of 90 percent isolation efficiency.

4). Fan shaft bearings shall be self-aligning, pillow block type.

b. Condenser Fans:

1). Condenser fans shall be direct drive propeller type, statically and dynamically balanced with 3 phase motors. Fans shall discharge air vertically upwards and be protected by PVC coated steel wire safety guards.

3. Compressors and Refrigeration Components

a. Compressors shall be reciprocating and shall be located for easy servicing. Compressors shall be equipped with cylinder unloading (minimum of 2 steps) to maintain capacity control at minimum cooling loads.

b. Semi hermetic compressors shall be mounted on spring type isolators with a minimum isolation efficiency of 95 percent.

c. Each compressor shall be equipped with an automatically reversible oil pump, insert type crankcase heaters and suction and discharge service valves.

d. Unit shall be equipped with dual refrigeration circuits each containing liquid line service valve, filter drier, sight glass, thermal expansion valve and fusible plug.

e. Maximum compressor operating speed shall be 1800 rpm.

f. Provide the following safety controls and equipment over temperature, over current, oil equalizer lines on circuits on dual compressors, high pressure, and low-pressure switches. Provide manufacturers recommended time delay, to prevent compressor short cycling. Provide any additional safety controls, recommended by manufacturer for proper operation, in addition to those listed above. See temperature control drawings for any requirements for provision of auxiliary contacts.

4. Evaporator and Condenser Coils

a. Evaporator coil shall be constructed of aluminum fins mechanically bonded to seamless copper tubes. Coils shall be full face active type during full and part load conditions.

b. Condenser coils shall be constructed of aluminum fins mechanically bonded to seamless copper tubes.

5. Filter Section

a. Filter section shall consist of 2" thick, disposable glass fiber filters of commercially available sizes. MERV 8 Rating.

6. Motors and Electrical Requirements

a. All unit power wiring shall enter the casing at a single location.

b. Electrical control cabinet shall include the following items:

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1). Power terminal block 2). Power transformer switch 115 volt secondary and 115-volt control fuse 3). 24-volt control transformer and fuse 4). All necessary relays 5). 115-volt terminal strip 6). 24- v o l t terminal strip containing wired terminals for all controls, numbered in accordance with the wiring diagram.

7). An isolated 24-volt field wiring terminal strip 8). An electrical print pocket which shall contain the electrical print and maintenance instructions.

9). Convenience 120 Volt outlet

c. All fan motors shall be premium efficiency type; see motor and starter paragraph of these specifications for additional requirements.

d. All power wiring shall be in conduit no exposed wiring shall be permitted. All power or control wiring within the condenser section and any other wiring exposed to the elements shall be in vapor tight conduit.

7. Control Panel

a. Unit Mounted control panel

1). Factory-wired, fuse-protected control transformer, connection for power supply and field-wired unit to remote control panel.

2). The unit shall be provided with modulating supply air temperature control with room thermostat override set at 70 degrees F.

3). Control Panel: Surface-mounted, remote panel, with engraved plastic cover and the following lights and switches

4). On-off-auto fan switch.

5). Heat-vent-off switch.

6). Supply-fan operation indicating light.

7). Heating operation indicating light.

8). Thermostat.

9). Damper position potentiometer.

10). Dirty-filter indicating light operated by unit-mounted differential pressure switch.

11). Safety-lockout indicating light.

12). Enclosure: NEMA 250, Type 1 13). Interface with DDC System for HVAC: Factory-installed hardware and software to enable the DDC system for HVAC to monitor, control, and display status and alarms of heating and ventilating unit.

a). Hardwired Points b). Room temperature.

c). Discharge-air temperature.

d). Burner operating e). ASHRAE 135.1 (BACnet) communication interface with the DDC system for

HVAC shall enable the DDC system for HVAC operator to remotely control and monitor the heating and ventilating unit from an operator workstation.

Control features and monitoring points displayed locally at heating and ventilating unit control panel shall be available through the DDC system for

HVAC.

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2.2 PACKAGED, DIRECT-FIRED (INDIRECT-FIRED AT CHARLESTOWN #7), OUTDOOR,

HEATING-ONLY MAKEUP-AIR UNITS

A. General Requirements

1. Provide where shown on drawings, a completely factory assembled, piped, wired and tested, rooftop heating unit (as specified and indicated in equipment schedules attached). The rooftop unit shall be shipped in one piece and shall have a single point power connection.

2. Units shall comply with AHRAE Standard 90.1, 2016 edition paragraph 6.1.1.3

3. The unit’s weight shall not exceed 10% of the existing unit’s weight.

4. The units shall match the electrical characteristics of the existing units with equal or lower horsepower.

5. Acceptable Manufacturers shall be Daikin, Carrier, Trane, JCI, or equal.

a. Provided that they meet the requirements of this specification and the performance requirements listed in the equipment schedules. Note particularly the following items.

b. The submitted rooftop unit must produce the CFM listed in the schedule, at the static pressure, external to the unit, listed in the schedule. This performance must be accomplished using equal or less fan horsepower than the scheduled unit and at an evaporator coil face velocity equal or less than the scheduled unit.

c. The rooftop unit shown on the drawings has been coordinated with architectural and structural elements, and with electrical service requirements. If the replacement units do not match exactly the existing curbs and roof openings, the manufacturer shall provide a curb adapter.

B. Products

1. System Description

a. Factory-assembled, prewired, self-contained unit consisting of cabinet, mixing/return air section and economizer dampers (indirect fired units only), supply fan, controls, filters, and gas burners. Units equipped with return air section shall be capable to deliver 100% outside air during economizer mode.

b. Direct-fired gas burner to be installed exterior to the building.

c. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA

70, by a qualified testing agency, and marked for intended location and application

2. Unit Casing

a. General Fabrication Requirements for Casings:

1). Forming: Form walls, roofs, and floors with at least two breaks at each joint.

2). Casing Joints: Sheet metal screws or pop rivets, factory sealed with water-resistant sealant.

3). Air-Handling-Unit Mounting Frame: Designed for low deflection, and with integral lifting lugs.

4). Airstream Surfaces: Surfaces in contact with the airstream shall comply with requirements in ASHRAE 62.1.

b. Configuration: Horizontal unit with bottom discharge for roof-mounting installation except for Horizontal discharge for MAU-1 and MAU -2 at the Arborway facility. Return opening for Charlestown #7.

c. Cabinet: Formed to ensure rigidity and supported by channels or structural channel supports with lifting lugs. Duct flanges at inlet and outlet. Pitched roof panels and knockouts with grommet seals for electrical and piping connections and lifting lugs.

d. Access Doors shall be provided for burner and fan motor assemblies on both sides of the unit.

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e. Internal Insulation: Fibrous-glass duct lining, neoprene coated, comply with ASTM C 1071, Type II, applied on complete unit.

1). Thickness: 2 inches.

2). Insulation Adhesive: Comply with ASTM C 916, Type I.

3). Density: 2.0 lb./cu. ft.

f. Casing Insulation and Adhesive 1). Materials: ASTM C 1071, Type I.

2). Location and Application: Factory applied with adhesive and mechanical fasteners to the internal surface of section panels downstream from, and including, the heating-coil section.

a). Liner Adhesive: Comply with ASTM C 916, Type I.

b). Mechanical Fasteners: Suitable for adhesive, mechanical, or welding attachment to duct without damaging liner when applied as recommended by manufacturer and without causing leakage in cabinet.

c). Liner materials applied in this location shall have airstream surface coated with a temperature-resistant coating or faced with a plain or coated fibrous mat or fabric, depending on service-air velocity.

3). Location and Application: Encased between outside and inside casing

3. Inspection and Access Panels and Access Doors

a. Panel and Door Fabrication: Formed and reinforced, single- or double-wall and insulated panels of same materials and thicknesses as casing.

b. Inspection and Access Panels:

1). Panel and Door Fabrication: Formed and reinforced, single- or double-wall and insulated panels of same materials and thicknesses as casing.

2). Inspection and Access Panels:

c. Access Doors 1). Hinges: A minimum of two ball-bearing hinges or stainless-steel piano hinge and two wedge-lever-type latches, operable from inside and outside. Arrange doors to be opened against air-pressure differential.

2). Gasket: Neoprene, applied around entire perimeters of panel frames.

3). Fabricate windows in doors of double-glazed, wire-reinforced safety glass with an air space between panes and sealed with interior and exterior rubber seals.

4). Locations and Applications a). Fan Section: Doors and inspection and access panels.

b). Access Section: Doors.

c). Coil Section: Inspection and access panels.

d). Damper Section: Inspection and access panels.

e). Filter Section: large enough to allow periodic removal and installation of filters.

4. Accessories

a. Duplex, 115-V, ground-fault-interrupter outlet with 15-A overcurrent protection. Include transformer if required.

b. Filter differential pressure switch with sensor tubing on either side of filter

5. Outdoor air intake hood

a. The hood shall be Manufacturer’s standard and match unit cabinet.

b. Bird Screen: Comply with requirements in ASHRAE 62.1

c. The hood shall be configured to inhibit wind-driven rain and snow from entering unit.

6. Roof curbs The roof curbs are existing. The manufacturer representative is required to take actual field measurement of the existing curbs and match the replacement units to it.

7. Supply-air fan

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a. Fan Type: Centrifugal, rated according to AMCA 210; statically and dynamically balanced, galvanized steel; mounted on solid-steel shaft with heavy-duty pillow-block bearings. Bearing rating: L10 of 150,000 hours

b. Mounting: Fan wheel, motor, and drives shall be mounted in fan casing with restrained, spring isolators.

8. Air filters

a. Disposable Panel Filters: Factory-fabricated, flat-panel-type, disposable air filters with holding frames, with a 2” MERV 8 according to ASHRAE 52.2.

9. Dampers

a. Outdoor/Return-Air Damper: Opposed-blade dampers with vinyl blade seals and stainless-steel jamb seals, having a maximum leakage of 10 cfm/sq. ft. of damper area, at a differential pressure of 2-inch w.g.

b. Damper Operator: Direct coupled, electronic with spring return. Units equipped with return/mixing section shall be provided with modulating outside and return air dampers for economizer operation.

10. Direct-fired gas burner

a. Description: Factory assembled, piped, and wired; and complying with ANSI Z21.47, "Gas-Fired Central Furnaces," and with NFPA 54, "National Fuel Gas Code" and Massachusetts approved.

1). CSA Approval: Designed and certified by and bearing label of CSA.

2). Natural gas modulating, electronically controlled electric spark with flame sensor.

b. Safety Controls 1). Vent Flow Verification: Flame rollout switch.

2). Control Transformer: 24-V ac.

3). High Limit: Thermal switch or fuse to stop burner.

4). Gas Train: Regulated, redundant, 24-V ac gas valve assembly containing pilot solenoid valve, electronic-modulating temperature control valve, pilot filter, pressure regulator, pilot shutoff, and manual shutoff all in one body.

5). Purge-period timer shall automatically delay burner ignition and bypass low-limit control.

6). Gas Manifold: Safety switches and controls complying with ANSI standards and Massachusetts approved.

7). Airflow Proving Switch: Differential pressure switch senses correct airflow before energizing pilot.

8). Automatic-Reset, High-Limit Control Device: Stops burner and closes main gas valve if high-limit temperature is exceeded.

9). Safety Lockout Switch: Locks out ignition sequence if burner fails to light after three tries. Controls are reset manually by turning the unit off and on.

11. Indirect-Fired Gas Burner (Charlestown #7 ONLY)

a. Description: Factory assembled, piped, and wired; and complying with ANSI Z21.47, "Gas-Fired Central Furnaces," and with NFPA 54, "National Fuel Gas Code" and Massachusetts approved.

1). CSA Approval: Designed and certified by and bearing label of CSA.

2). Natural gas modulating, electronically controlled electric spark with flame sensor.

b. Gas Train: Regulated, redundant, 24-V ac gas valve assembly containing pilot solenoid valve, electronic-modulating temperature control valve, pilot filter, pressure regulator, pilot shutoff, and manual shutoff all in one body.

c. Gas Manifold: Safety switches and controls complying with ANSI standards and Massachusetts approved.

d. The furnace shall be power vented, and shall have provision for condensate drainage from the heat exchanger

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e. Heat Exchanger: Stainless steel.

f. Heat-Exchanger Drain Pan: Stainless steel.

12. Unit control panel

a. Factory-wired, fuse-protected control transformer, connection for power supply and field-wired unit to remote control panel.

b. The unit shall be provided with modulating supply air temperature control with room thermostat override set at 70 degrees F.

c. Control Panel: Surface-mounted, remote panel, with engraved plastic cover and the following lights and switches 1). On-off-auto fan switch.

2). Heat-vent-off switch.

3). Supply-fan operation indicating light.

4). Heating operation indicating light.

5). Thermostat.

6). Damper position potentiometer.

7). Dirty-filter indicating light operated by unit-mounted differential pressure switch.

8). Safety-lockout indicating light.

9). Enclosure: NEMA 250, Type 1

d. Interface with DDC System for HVAC: Factory-installed hardware and software to enable the DDC system for HVAC to monitor, control, and display status and alarms of heating and ventilating unit.

1). Hardwired Points a). Room temperature.

b). Discharge-air temperature.

c). Burner operating

2). ASHRAE 135.1 (BACnet) communication interface with the DDC system for HVAC shall enable the DDC system for HVAC operator to remotely control and monitor the heating and ventilating unit from an operator workstation. Control features and monitoring points displayed locally at heating and ventilating unit control panel shall be available through the DDC system for HVAC.

13. Motors

a. All unit power wiring shall enter the casing at a single location.

b. Electrical control cabinet shall include the following items:

1). Power terminal block 2). Power transformer switch 115 volt secondary and 115-volt control fuse 3). 24-volt control transformer and fuse 4). All necessary relays 5). 115-volt terminal strip 6). 24- v o l t terminal strip containing wired terminals for all controls, numbered in accordance with the wiring diagram.

7). An isolated 24-volt field wiring terminal strip 8). An electrical print pocket which shall contain the electrical print and maintenance instructions.

9). Convenience 120 Volt outlet

c. All fan motors shall be premium efficiency type; see motor and starter paragraph of these specifications for additional requirements.

d. All power wiring shall be in conduit no exposed wiring shall be permitted. All power or control wiring within the condenser section and any other wiring exposed to the elements shall be in vapor tight conduit.

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PART 3 - Execution

3.1 POST AWARD SUBMITTAL

A. The manufacturer shall provide the authority the following information during the future installation of this equipment.

1. Operational and Maintenance Data: For direct-fired makeup-air units to include in emergency, operation, and maintenance manuals.

2. Maintenance Materials

a. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents:

b. Filters: One set(s) for each unit.

c. Fan Belts: One set(s) for each unit (if required)

3. Warranty Information

a. Standard Warranty Information

b. Warranty Period for Heat Exchangers: Manufacturer's standard, but not less than five years from date of Substantial Completion.

3.2 STARTUP SERVICE

A. Inspection and Testing

1. The Owner, the engineer, and the installation contractor reserves the right to inspect all items before shipment.

2. The general assembly of the equipment shall be supervised and inspected by the manufacturer’s representative. The assembly shall conform to the specifications, attachments, and any documented and agreed upon changes.

a. All arrangements and dimensions shall be verified.

b. Component tagging will be verified.

c. Component model and serial number shall be verified, as applicable.

d. Assembly and compliance with procedures and arrangement shall be verified.

B. Installation

1. Manufacturer’s controls and equipment representatives shall be available during site installation to resolve controls system integration issues.

C. Startup Service

1. Factory-authorized service representative to perform startup service.

a. Complete installation and startup check according to manufacturer's written instructions.

b. Verify that shipping, blocking, and bracing are removed.

c. Verify that unit is secure on mountings and supporting devices and that connections to piping, ducts, and electrical systems are complete. Verify that proper thermal-overload protection is installed in motors, controllers, and switches.

d. Verify proper motor rotation direction, free fan wheel rotation, and smooth bearing operations. Reconnect fan drive system, align belts, and install belt guards.

e. Verify that bearings, pulleys, belts, and other moving part are lubricated with factory-recommended lubricants.

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f. Verify that outdoor- and return-air mixing dampers open and close and maintain minimum outdoor-air setting.

g. Comb coil fins for parallel orientation.

h. Install new, clean filters.

D. Adjusting

1. Adjust damper linkages for proper damper operation.

E. Demonstration/Training

1. A factory-authorized service representative shall be provided to train maintenance personnel to adjust, operate, and maintain roof-top units.

2. Assume two (2) hours per roof-top unit for training.

F. Commissioning

1. Provide all test report and field inspection reports to engineer/authority.