Clarifications.pdf

Q & A

RFQ# FA282324Q3029

Q. For the ThermaDuct, are you asking for (3) 50ft. sections totaling 150 ft.? Or (3) sets of 150ft.?

Q. We need to know the duct width, height and length for the pieces. We need a layout – to know if they are straight pieces or elbows and it helps to know the cfm of air passing through the duct, but that is not required. Please send your duct layout and sizes.

A. The ThermaDuct requirement is for 3 fabricated pieces according to Exhibit AA in the Salient Characteristics. The customer will assemble the 3 fabricated pieces. Those CAD drawings will show you the dimensions.

Q. For the Ductsox, can you break those up into systems? Or is it all a single system? Do you have the CFM and static pressure?

A. The Ductsox is a for single system which can be seen in Exhibit AB and AC of the Salient Characteristics.

Q. What size unit is this? Or the model number?

A. The unit is a 5-ton heat pump packaged RTU. Please see attached manual and specs for the unit in question. (See Manual Below)

Q. Is this supposed to be the Thermaduct? I don’t see where the 150ft is coming from if so.

A. I used the attachment to delineate the 3 pieces that are required. The 150 sq ft reference for the Thermaduct is intended to give offerors an idea of how much material is estimated in order to make the pieces since raw materials could possibly come in different lengths and widths. (See Diagram Below)

Q. The part list doesn't match the drawing. In the drawing there are 4 elbows. So which is correct the drawing or the written descriptions?

A. The drawing is correct; there are 4 elbows. The solicitation on SAM.gov will be updated to reflect this information.

Trane Precedent Heat Pump Packaged Rooftop

Unit Overview - WSC060H4R0A**000000000000000000000000000 Application Unit Size Supply Fan External Dimensions (in.) Operating Weight EER IEER/SEER Elevation

DX cooling 5 Ton Airflow

External Static

Pressure Height Width Length Minimum Maximum

12.3 EER 14.30

1900 cfm 0.600 in H2O 3.41 ft 4.44 ft 7.39 ft 682.0 lb 1071.0 lb

Unit Features

Unit Electrical Voltage/phase/hertz 460/60/3

MCA 15.00 A

MOP 20.00 A

MCA (230 w/ Elec Heat) 0.00 A MOP (230 w/ Elec Heat) 0.00 A

Cooling Section Entering Dry Bulb 80.00 F Entering Wet Bulb 67.00 F

Ambient Temp 95.00 F Leaving Coil Dry Bulb 56.65 F Leaving Coil Wet Bulb 56.56 F Leaving Unit Dry Bulb 58.24 F Leaving Unit Wet Bulb 57.13 F

Capacity Gross Total 60.65 MBh

Gross Sensible 47.33 MBh Net Total 59.04 MBh

Net Sensible 45.73 MBh Fan Motor Heat 0.62 MBh

Refrig Charge-circuit 1 11.5 lb

Heating Section Heat Pump Mode

Output Heating Capacity 57.44 MBh Output Heating Capacity with Fan 58.06 MBh

Heating Delta T 27.99 F Heating EAT 70.00 F

Heating Ambient Temp 47.00 F Heating Ambient WB 42.00 F

Heating Ambient Relative Humidity 70.00 %

Fan Section Indoor Fan Data

Type FC Centrifugal Drive Type Direct

Evap Fan FLA 4.00 A Indoor Fan Performance

Airflow 1900 cfm Design ESP 0.600 in H2O

Component SP 0.000 in H2O Total SP 0.600 in H2O

Supply Motor Horsepower 1.000 hp Indoor Motor Operating Power 0.63 bhp

Indoor Motor Power 0.47 kW Indoor RPM 955 rpm

Outdoor Fan Data Type Propeller

Fan Quantity 1 Drive Type Direct

Outdoor Fan Performance Outdoor Motor Power 0.41 kW

Condenser Fan FLA 0.80 A

Compressor Section Power 4.14 kW

Circuit 1 RLA 7.80 A Circuit 2 RLA 0.00 A

Accessories Fresh air selection Manual outside air damper 0-50%

Zone sensors Room sns w/ temp.adj. w/ovrd Condenser coil guard Condenser hail guard

Electric heaters 12 kW Electric heat 3 ph

Warranty

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Labor warranty (first year) 1st Year Labor warranty

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General The units shall be convertible airflow. The operating range shall be between 115°F and 0°F in cooling as standard from the factory for units with microprocessor controls. Cooling performance shall be rated in accordance with ARI testing procedures. All units shall be factory assembled, internally wired, fully charged with R-410A, and 100 percent run tested to check cooling operation, fan and blower rotation, and control sequence before leaving the factory. Wiring internal to the unit shall be colored and numbered for simplified identification. Units shall be cULus listed and labeled, classified in accordance for Central Cooling Air Conditioners.

Case Unit casing shall be constructed of zinc coated, heavy gauge, and galvanized steel. Exterior surfaces shall be cleaned, phosphatized, and finished with a weather-resistant baked enamel finish. Unit's surface shall be tested 672 hours in a salt spray test in compliance with ASTM B117. Cabinet construction shall allow for all maintenance on one side of the unit. All exposed vertical panels and top covers in the indoor air section shall be insulated with a cleanable foil-faced, fire-retardant permanent, odorless glass fiber material. All insulation edges shall be either captured or sealed. The unit's base pan shall have no penetrations within the perimeter of the curb other than the raised 1 1/8" high downflow supply/return openings to provide an added water integrity precaution, if the condensate drain backs up. The base of the unit shall have provisions for forklift and crane lifting, with forklift capabilities on three sides of the unit.

Unit Top The top cover shall be one piece construction or, where seams exist, it shall be double-hemmed and gasket-sealed. The ribbed top adds extra strength and enhances water removal from unit top.

Filters Throwaway filters shall be standard on all units. Optional 2" MERV 8 and MERV 13 filters shall also be available.

Compressors All units shall have direct-drive, hermetic, scroll type compressors with centrifugal type oil pumps.

Motor shall be suction gas-cooled and shall have a voltage utilization range of plus or minus 10 percent of unit nameplate voltage. Internal overloads shall be provided with the scroll compressors.

Refrigerant Circuits Service pressure ports, and refrigerant line filter driers are factory-installed as standard. An area shall be provided for replacement suction line driers.

Evaporator and Condenser Coils Internally finned, 5/16"copper tubes mechanically bonded to a configured aluminum plate fin shall be standard. Coils shall be leak tested at the factory to ensure the pressure integrity. The evaporator coil and condenser coil shall be leak tested to 650 psig and pressure tested to 450 psig. The condenser coil shall have a patent pending 1+1+1 hybrid coil designed with slight gaps for ease of cleaning. A removable, reversible, double-sloped condensate drain pan with through the base condensate drain is standard.

Outdoor Fans The outdoor fan shall be direct-drive, statically and dynamically balanced, draw-through in the vertical discharge position. The fan motor shall be permanently lubricated and shall have built-in thermal overload protection.

Indoor Fan Standard efficiency 6 to 8.5 ton units come standard with belt drive motors with an adjustable idlerarm assembly for quick-adjustment to fan belts and motor sheaves. All high efficiency and 10 ton standard efficiency shall have variable speed direct drive motors. All motors shall be thermally protected. All indoor fan motors meet the U.S. Energy Policy Act of 1992 (EPACT).

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Controls Unit shall be completely factory-wired with necessary controls and contactor pressure lugs or terminal block for power wiring. Unit shall provide an external location for mounting a fused disconnect device.

A choice of microprocessor or electromechanical controls shall be available. Microprocessor controls provide for volt control functions. The resident control algorithms shall make all heating, cooling, and/or ventilating decisions in response to electronic signals from sensors measuring indoor and outdoor temperatures. The control algorithm maintains accurate temperature control, minimizes drift from set point, and provides better building comfort. A centralized Microprocessor shall provide anti-short cycle timing and time delay between compressors to provide a higher level of machine protection.

Phase monitor Phase monitor shall provide 100% protection for motors and compressors against problems caused by phase loss, phase imbalance, and phase reversal. Phase monitor is equipped with an LED that provides an ON or FAULT indicator. There are no field adjustments. The module will automatically reset from a fault condition.

Accessory - Electric Heaters Electric heat modules shall be available for installation within basic unit. Electric heater elements shall be constructed of heavy-duty nickel chromium elements internally delta connected for 240 volt, wye connected for 480 and 600 volt. Staging shall be achieved through ReliaTel. Each heater package shall have automatically reset high limit control operating through heating element contactors. All heaters shall be individually fused from the factory, where required, and shall meet all NEC and CEC requirements when properly installed. Power assemblies shall provide single point connection. Electric heat modules shall be UL listed or CSA certified.

Accessory - Manual Outside Air Damper This rain hood and screen shall provide up to 50 percent outside air.

Accessory - Tool-less Hail Guards Tool-less, hail protection quality coil guards are available for condenser coil protection.

Sequence of Operation (if applied in a SINGLE-ZONE CONSTANT-VOLUME SYSTEM or a

CHANGEOVER BYPASS SYSTEM)

B. SINGLE-ZONE CONSTANT-VOLUME SYSTEM

1. OCCUPIED HEAT/COOL:

The RTU shall operate the supply fan continuously and modulate (or cycle) compressors, modulate (or stage) heat, and/or enable airside economizing to maintain zone temperature at setpoint. The OA damper shall open to bring in the required amount of ventilation.

2. MORNING WARM-UP/PRE-COOL:

The RTU shall operate the supply fan and modulate (or cycle) compressors or modulate (or stage) heat to raise/lower zone temperature to its occupied setpoint. The OA damper shall remain closed, unless economizing.

D. CHANGEOVER BYPASS SYSTEM

1. OCCUPIED HEAT/COOL:

Each VAV terminal shall use pressure-independent control, with airflow measurement, to vary primary airflow to maintain zone temperature at its occupied setpoint. The RTU shall modulate the bypass damper to maintain duct static pressure at setpoint and modulate (or cycle) compressors, modulate (or stage) heat, and/or enable airside economizing based on current zone cooling/heating demands. The OA damper shall open to bring in the required amount of ventilation.

2. MORNING WARM-UP/PRE-COOL:

Each VAV terminal unit shall vary primary airflow to raise/lower zone temperature to its occupied setpoint. The RTU shall modulate the bypass damper to maintain duct static pressure at setpoint and modulate (or cycle) compressors or modulate (or stage) heat based on current zone cooling/heating demands. The OA damper shall remain closed, unless economizing.

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3. COOLING/HEATING CHANGEOVER LOGIC:

The System Controller shall determine the overall system cooling/heating mode based on "voting" from each zone. When the majority of zones require cooling, the RTU shall operate in cooling mode and any zone that requires heating shall reduce primary airflow to minimum. When the majority of zones require heating, the RTU shall operate in heating mode and any zone that requires cooling shall reduce primary airflow to minimum.

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