A. Base Unit: Commercial Packaged Air-Handling Unit 1. Cabinet shall be constructed of mill-HVAC Guide Specifications galvanized steel. Size Range: 2,400 to 6,000 Cfm (1150 to 2830 L/s), 2. Cabinet panels shall be fully insulated Nominal Airflow, 6 to 15 Tons (21 to 52 kW), Nominal with ?-in. (12.7-mm) fire-retardant Cooling material. Insulation shall contain an EPA-Carrier Model Nos: 40RUA (Direct-Expansion Coil) registered immobilized antimicrobial 40RUS (Chilled Water Coil) agent to effectively resist the growth of Part 1 — GENERAL bacteria and fungi as proven by tests in 1.01 SYSTEM DESCRIPTION accordance with ASTM standards G21 A. Indoor, packaged air-handling unit for use in and 22 (U.S.A.). commercial split systems. Unit shall have a 3. Unit shall contain non-corroding multi-position design and shall be capable of condensate drain pans for both vertical horizontal or vertical installation on a floor or and horizontal applications. Drain pans in a ceiling, with or without ductwork. (Only shall have connections on right and left vertical units are to be applied without sides of unit to facilitate field connection. ductwork.) Drain pans shall have the ability to be B. Unit with direct-expansion coil shall be used sloped toward the right or left side of the in a refrigerant circuit with a matching air-unit to prevent standing water from cooled condensing unit. Unit with chilled accumulating in pans. water coil shall be used in a chilled water 4. Unit shall have factory-supplied 2-in. (51 circuit. mm) throwaway-type filters installed 1.02 QUALITY ASSURANCE upstream from the cooling coil. Filter A. Coils shall be designed and tested in access shall be from either the right or left accordance with ASHRAE 15 Safety Code for side of the unit. Mechanical Refrigeration (U.S.A.), latest B. Coils: edition. DX coil is 4-row and consists of copper tubes B. Unit shall be constructed in accordance with with sine-wave aluminum fins bonded to the ETL (U.S.A.) and ETL, Canada, standards and tubes by mechanical expansion. Suction and shall carry the ETL and ETL, Canada, labels. liquid line connections or supply and discharge C. Unit insulation and adhesive shall comply with connections shall be made on the same side of NFPA-90A (U.S.A.) requirements for flame the coil. spread and smoke generation. Insulation shall 1. Direct-expansion coils shall feature contain an EPA-registered immobilized factory installed thermostatic expansion antimicrobial agent to effectively resist the valves (TXVs) for refrigerant control. The growth of bacteria and fungi as proven by tests TXVs shall be Puron? R-410A in accordance with ASTM standards G21 and compatible and capable of external 22 (U.S.A.). adjustment. Direct-expansion heat pump D. Unit shall be manufactured in a facility coils shall have a factory-installed bypass registered to the ISO 9001:2000 line and check valve assembly around the manufacturing quality standard. TXVs to allow liquid flow from the coil to E. Direct-expansion and chilled water coils shall the outdoor unit during the heating mode. be burst and leak tested at 435 psi (2999 kPa). Coil tubing shall be internally rifled to 1.03 DELIVERY AND STORAGE maximize heat transfer. Units shall be stored and handled per 2. Chilled water coils shall be rated for an manufacturer's recommendations. operating pressure of not less than 300 Part 2 — Products psig (2069 kPag). 2.01 EQUIPMENT C. Operating Characteristics: Indoor mounted, draw-thru, packaged air-handling Unit shall be capable of providing cfm (L/s) unit that can be used in a suspended horizontal airflow at an external static pressure of in. wg configuration or a vertical configuration. Unit shall (kPag). consist of forward-curved belt-driven centrifugal D. Motor: fan(s), motor and drive assembly, pre-wired fan 1. Fan motor of the size and electrical motor contactor, factory-installed refrigerant characteristics specified on the equipment metering devices (direct-expansion coil units), schedule shall be factory supplied and cooling coil, 2-in. (51-mm) disposable air filters, installed. and condensate drain pans for vertical or horizontal
2. Motors rated at 1.3 through 3.7 hp (0.97 5. Electric Heaters:
through 2.76 kW) shall have internal Heaters for nominal 240, 480, or 575-volt,
thermal overload protection. Motors rated 3-phase, 60 Hz shall be factory-supplied
at 5 hp (3.73 kW) shall be protected by a for field installation as shown on the
circuit breaker. equipment drawings. Electric heat
3. Evaporator-fan motor shall have assembly shall be ETL (U.S.A.) and ETL,
permanently lubricated, sealed bearings Canada, agency approved, and shall have
and inherent automatic-reset thermal single-point power wiring. Heater
overload protection or manual reset assembly shall include contactors with 24-
calibrated circuit breakers. Evaporator v coils, power wiring, 24-v control wiring
motors are designed specifically for terminal blocks, and a hinged access panel.
Carrier and do not have conventional Electric heaters shall not be used with air
horsepower (hp) ratings listed on the discharge plenum.
motor nameplate. Motors are designed 6. Air Discharge Plenum:
and qualified in the “air-over" location Plenum shall be factory-supplied to
downstream of the cooling coil and carry provide free-blow air distribution for
a maximum continuous bhp rating that is vertical floor-mounted units. A grille with
the maximum application bhp rating for moveable vanes for horizontal or vertical
the motor; no “safety factors" above that airflow adjustment shall be included.
rating may be applied. Plenum shall be field-assembled and field-
4. All evaporator-fan motors 5 hp and larger installed on the unit's fan deck for blow-
shall meet the minimum efficiency thru air distribution. Plenum shall not be
requirements as established by the Energy used with electric heaters.
Policy Act of 1992 (EPACT), effective 7. Return-Air Grille:
October 24, 1997. Grille shall be factory-supplied for field
E. Special Features: installation on the unit's return air opening.
1. Alternate Motor and Drive: 8. Unit Subbase:
An alternate motor and/or medium-static Subbase assembly shall be factory-
or high-static drive shall be available to supplied for field installation. Subbase
meet the airflow and external static shall elevate floor-mounted vertical units
pressure requirements specified on the to provide access for correct condensate
equipment schedule. drain connection.
2. External Paint: 9. Economizer:
Where conditions require, units shall be Economizer for ventilation or “free"
painted with an American Sterling Gray cooling shall be factory provided for field
finish. installation on either return air opening of
3. Hot Water Coil: air handler. For free cooling applications,
Coil shall be 2-row, U-bend coil with economizer shall be compatible with
copper tubes and aluminum plate fins separate thermostat; economizer dampers
bonded to the tubes by mechanical shall open when outdoor air enthalpy is
expansion. Coil shall be mounted in a suitable for free cooling. Economizer shall
galvanized steel housing that shall be be compatible with separate CO sensor 2
fastened to the unit's fan deck for blow-accessory; economizer dampers shall open
thru heating operation. Coil shall have when indoor CO2 level rises above
maximum working pressure of 150 psig predetermined set point. Economizer shall
(1034 kPag). include enthalpy control and damper
4. Steam Distributing Coil: actuator.
Coil shall consist of one row of copper 10. Thermostat Controls:
tubes with aluminum plate fins, and shall a. TEMP System programmable
have inner steam distributing tubes. Coil communicating multi-stage
shall be mounted in a galvanized steel thermostat with fan switch, time
housing and shall be fastened to the unit's clock, LCD display, ?F/?C capability,
fan deck for blow-thru heating operation. and CCN (Carrier Comfort
Coil shall have maximum working Network?) compatibility.
pressure of 20 psig at 260?F (138 kPag at
b. Commercial Electronic Thermostat 14. UV-C Germicidal Lamps:
with 7-day time clock, auto- a. UV-C emitters and fixtures shall be
changeover, multi-stage capability, specifically designed for use inside an
and large LCD temperature display. HVAC system. An ASME nozzled
11. Overhead Suspension Package: test apparatus using a 45?F (7.2?C)
Package shall include necessary brackets airstream moving at not less than 400
to support units in a horizontal ceiling fpm (189 liters/sec.) shall measure
installation. individual lamp output. Lamp output
12. CO Sensor: at 253.7 nm shall not be less than 2
Sensor shall provide the ability to signal 10μW/cm2 per inch of arc length
the economizer to open when the space measured at a distance of one meter.
CO level exceeds the predetermined b. UV-C power supplies shall be high 2
setpoint. Sensor shall have the capability efficiency, electric type which are
of being connected to Comfort System matched to the emitters and are
relay pack or to economizer using field-capable of producing the specified
supplied and field-installed Honeywell dc output intensity with an input power
adapter no. Q769C1004. no more than 80 watts.
13. Condensate Drain Trap: c. Emitters and fixtures shall be
Trap shall have transparent, serviceable installed in sufficient quantity and
design for easy cleaning. Kit shall include arranged so as to provide an equal
overflow shutoff switch and wiring distribution of UV-C energy on the
harness for connection to an alarm if coil and drain pan.
desired. d. The minimum UV-C energy striking
the leading edge of the coil fins shall
be not less than 820 μW/cm2 at the
closest point and through placement,
not less than 60% of that value at the
farthest point. Equal amounts are to
strike the drain pan, either directly or
indirectly through reflection.