HVAC Guide Specifications
Packaged Rooftop Air-to-Air Heat Pump with Electric Heat Option — Constant Volume Application
3 to 10 Tons, Nominal Cooling
Carrier Model Number:
Part 1 — General
1.01 SYSTEM DESCRIPTION
Outdoor rooftop- or slab-mounted, electrically controlled air-to-air heat pump utilizing a hermetic
compressor for heating and cooling duty. Unit shall discharge supply air vertically or horizontally as
shown on contract drawings.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/240 and 270.
B. Unit shall be designed to conform to ASHRAE 15, latest revision, and in accordance with UL
C. Unit shall be UL tested and certified in accordance with ANSI Z21.47 Standard and UL listed and
certified under Canadian Standards as a total package for safety requirements.
D. Roof curb shall be designed to conform to NRCA Standards.
E. Insulation and adhesive shall meet NFPA 90A requirements for flame spread and smoke
F. Unit casing shall be capable of withstanding Federal Test Method Standard No. 141 (Method
6061) 500-hour salt spray test.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit(s) shall be stored and handled per manufacturer’s recommendations.
Part 2 — Products
2.01 EQUIPMENT (STANDARD)
Factory-assembled, single-piece air-to-air heat pump. Contained within the unit enclosure shall
be all factory wiring, piping, controls, refrigerant charge (R-22), and special features required prior
to field start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized steel, bonderized and coated with a baked
enamel finish on all externally exposed surfaces with primer coated internal panels. 12. Indoor fan cabinet interior shall be insulated with a minimum /-in. thick flexible fiberglass 2insulation coated on the air side.
3. Cabinet panels shall be easily removable for servicing.
4. Holes shall be provided in the base rails for rigging shackles to facilitate overhead rigging,
and forklift slots shall be provided to facilitate maneuvering.
5. Unit shall have a factory-installed, sloped condensate drain pan made of a non-corrosive 3material, providing a minimum /-in. connection with both vertical and horizontal drains and 4shall comply with ASHRAE 62.
6. Unit shall have factory-installed filter access panel to provide filter access with tool-less
7. Unit shall have standard thru-the-bottom power connection capability.
1. Indoor blower shall be of the direct- or belt-driven, double inlet, forward-curved centrifugal
type. Belt drive shall include an adjustable-pitch motor pulley.
2. Indoor blower shall be made from steel with a corrosion-resistant finish and shall be
3. Bearings shall be of the sealed, permanently lubricated, ball-bearing type for longer life and
4. Outdoor fan shall be of the direct-driven propeller type and shall discharge air vertically.
5. Outdoor fan shall have aluminum blades riveted to corrosion-resistant steel spiders and shall
be dynamically balanced.
1. Fully hermetic type, internally protected.
2. Factory rubber shock-mounted and internally spring mounted for vibration isolation.
1. Outdoor and indoor coils shall have aluminum plate fins mechanically bonded to enhanced
copper tubes with all joints brazed.
2. Tube sheet openings shall be belled to prevent tube wear.
3. Indoor coil shall be of the face split design.
a. Copper-fin coils shall be constructed of copper fins mechanically bonded to copper tubes
and copper tube sheets. Galvanized steel tube sheets shall not be acceptable. A polymer
strip shall prevent coil assembly from contacting the sheet metal coil pan to minimize
potential for galvanic corrosion between coil and pan. All copper construction shall
provide protection in moderate coastal environments.
b. E-Coated aluminum-fin coils shall have a flexible epoxy polymer coating uniformly
applied to all coil surface areas without material bridging between fins. Coating process
shall ensure complete coil encapsulation. Color shall be high gloss black with gloss — 60
deg of 65 to 90% per ASTM D523-89. Uniform dry film thickness from 0.8 to 1.2 mil on all
surface areas including fin edges. Superior hardness characteristics of 2H per ASTM
D3363-92A and cross-hatch adhesion of 4B-5B per ASTM D3359-93. Impact resistance
shall be up to 160 in./lb (ASTM D2794-93). Humidity and water immersion resistance
shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM
D870-92). Corrosion durability shall be confirmed through testing to be no less than 1000
hours salt spray per ASTM B117-90. Coil construction shall be aluminum fins
mechanically bonded to copper tubes.
c. E-Coated copper-fin coils shall have a flexible epoxy polymer coating uniformly applied to
all coil surface areas without material bridging between fins. Coating process shall ensure
complete coil encapsulation. Color shall be high gloss black with gloss — 60 deg of 65 to
90% per ASTM D523-89. Uniform dry film thickness from 0.8 to 1.2 mil on all surface
areas including fin edges. Superior hardness characteristics of 2H per ASTM D3363-92A
and cross-hatch adhesion of 4B-5B per ASTM D3359-93. Impact resistance shall be up
to 160 in./lb (ASTM D2794-93). Humidity and water immersion resistance shall be up to
minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92).
Corrosion durability shall be confirmed through testing to be no less than 1000 hours salt
spray per ASTM B117-90. Coil construction shall be copper fins mechanically bonded to
copper tubes with copper tube sheets. Galvanized steel tube sheets shall not be
acceptable. A polymer strip shall prevent coil assembly from contacting sheet metal coil
pan to maintain coating integrity and minimize corrosion potential between coil and pan.
d. Optional precoated aluminum-fin coils shall have a durable epoxy-phenolic coating to
provide protection in mildly corrosive coastal environments. Coating shall be applied to
the aluminum fin stock prior to the fin stamping process to create an inert barrier between
the aluminum fin and copper tube. Epoxy-phenolic barrier shall minimize galvanic action
between dissimilar metals.
F. Refrigerant Components: Refrigerant circuit components shall include:
1. Acutrol? multiple independent circuit metering system.
2. Service gage connections on suction, discharge, and liquid line to charge, evacuate, and
4. Reversing valve.
G. Filter Section:
1. Standard filter section shall consist of factory-installed low-velocity, throwaway 2-in. thick
fiberglass filters of commercially available sizes.
2. Filter face velocity shall not exceed 300 fpm at nominal airflows.
3. Filter section shall use only one size filter.
4. Filters shall be accessible through an access panel with ‘‘no-tool’’ removal.
H. Controls and Safeties:
1. Unit Controls:
a. Unit shall be complete with self-contained low-voltage control circuit.
b. Unit shall incorporate an outdoor coil defrost system to prevent excessive frost
accumulation during heating duty, and shall be controlled as follows:
1) Defrost shall be initiated on the basis of time and coil temperature.
2) A 30/50/90-minute timer shall activate defrost cycle only if coil temperature is low
enough to indicate a heavy frost condition.
3) Defrost cycle shall terminate when defrost thermostat is satisfied and shall have a
positive termination time of 10 minutes.
c. Unit shall contain high-pressure, loss-of-charge/low-pressure, and freeze protection
switches. It shall mount on factory-installed Schrader fittings.
2. Standard Safeties:
Unit shall incorporate compressor overtemperature and overcurrent safety devices to shut off
I. Operating Characteristics:
1. Unit shall be capable of starting and running in cooling at 125 F ambient outdoor temperature,
meeting maximum load criteria of ARI Standard 210/240 at ?10% voltage. 2. Compressor with standard controls shall be capable of cooling operation down to 25 F
ambient outdoor temperature.
3. Compressor shall be capable of operation in heating duty down to –10 F ambient outdoor-air
4. Unit shall be capable of simultaneous heating duty and defrost cycle operation when using
electric heaters indicated in Section L, Special Features.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single factory-predrilled location.
1. Compressor motors shall be cooled by refrigerant passing through motor windings and shall
have line break thermal and current overload protection.
2. Indoor blower motor shall have permanently lubricated bearings and inherent automatic-reset
thermal overload protection.
3. Totally enclosed outdoor-fan motor shall have permanently lubricated bearings, and inherent
automatic-reset thermal overload protection.
L. Special Features:
Certain features are not applicable when the features designated by * are specified. For assistance in amending the specifications, your local Carrier Sales Office should be contacted. * 1. Carrier PremierLink? Controls:
a. Shall be available as a factory-installed or as a field-installed accessory.
b. Shall work with CCN and ComfortVIEW? software.
c. Shall be compatible with ComfortLink? controllers.
d. Shall be ASHRAE 62-99 compliant.
e. Shall accept a CO sensor in the conditioned space — Demand Control Ventilation 2(DCV) Ready.
f. Shall have baud communication rate of 38.4K or faster.
g. Shall be Internet Ready.
h. Shall include an integrated economizer controller.
2. Apollo Control:
a. Shall serve as interface between thermostat, Carrier rooftop unit, and any external
b. Shall be powered by 24 vac/10 va, supplies thermostat with 10 vdc. This power is
supplied by the Carrier rooftop unit, and is factory wired.
3. Roof Curbs:
a. Formed galvanized steel with wood nailer strip and capable of supporting entire unit
b. Allows for installing and securing ductwork to curb prior to mounting unit on the curb. * 4. Integrated Economizers:
a. Integrated integral-modulating type capable of simultaneous economizer and
b. Includes all hardware and controls to provide cooling with outdoor air.
c. Equipped with low-leakage dampers not to exceed 3% leakage at 1 in. wg pressure
differential (Durablade economizer).
d. Capable of introducing up to 100% outdoor air in both minimum and fully open
e. Equipped with a gravity relief sliding plate damper (Durablade economizer). Damper
shall close upon unit shutoff.
f. EconoMi$er shall be equipped with a barometric relief damper with up to 100% of
return air (004-007) or 90% of return air (008-012) relief. The Durablade economizer is
equipped with 30% of return-air relief (004-012).
g. Designed to close damper during loss-of-power situations with emergency power
supply (Durablade economizer) or spring return built into motor (EconoMi$er).
h. Dry bulb outdoor-air temperature sensor shall be provided as standard. Enthalpy
control shall be provided as an option.
i. Durablade economizer is a guillotine-style damper, and the EconoMi$er is a gear-
driven, parallel blade design.
NOTE: EconoMi$er shall also be available with field-installed two-stage power exhaust
accessory for vertical or horizontal duct applications.
5. 25% Manual Outdoor-Air Damper:
Manual damper package shall consist of damper, birdscreen, and rainhood which can be
preset to admit up to 25% outdoor air for year-round ventilation.
6. 50% Manual Outdoor-Air Damper:
Manual damper package shall consist of damper birdscreen, and rainhood which can be
preset to admit up to 50% outdoor air for year-round ventilation.
* 7. 100% Two-Position Damper:
a. Two-position damper package shall include single blade damper. Admits up to 100%
b. Damper shall close upon indoor fan shutoff.
c. Designed to close damper during loss of power situations.
d. Equipped with barometric relief damper.
* 8. 25% Two-Position Damper:
a. Two-position damper package shall include single blade damper and motor. Admits up
to 25% outdoor air.
b. Damper shall close upon indoor fan shutoff.
* 9. Solid-State Enthalpy Control:
a. For use with Durablade economizer package only.
b. Capable of sensing outdoor-air enthalpy content (temperature and humidity) and
controlling economizer cut-in point to have minimum heat content air passing over the
indoor coil for most efficient system operation.
* 10. Differential Enthalpy Sensor:
a. For use with economizer only.
b. Capable of comparing enthalpy content (temperature and humidity) of outdoor and
indoor air and controlling economizer cut-in point at the most economical level. * 11. Electric Resistance Heaters:
a. Open wire nichrome elements with all necessary safety operating controls.
b. UL listed and indicated on basic unit informative plate.
c. Available in multiples to match heating requirements.
d. Single point kits available for each heater when required.
* 12. Head Pressure Control Packages:
Consists of solid-state control and outdoor-coil temperature sensor to maintain condensing
temperature between 90 F and 110 F at outdoor ambient temperatures down to –20 F by
outdoor fan speed modulation or outdoor fan cycling.
* 13. Thermostat and Subbase:
Provides staged cooling and heating automatic (or manual) changeover, fan control, and
14. Thru-The-Bottom Service Connections:
Kit shall provide connectors to permit electrical connections to be brought to the unit
through the basepan.
* 15. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic thermostat. Shall use built-in compressor
cycle delay control for both heating and cooling duty. Capable of working with Carrier direct
The package shall be an outdoor rooftop or surface mounted, electronically controlled, air-
to-air heat pump unit utilizing a hermetic compressor for cooling and heating duty.
The Energy$Recycler shall recover energy from building exhaust air and pre-condition
ventilation air to allow higher ventilation requirements and minimizing energy cost.
This option shall be available with the following:
a. A mounting kit for the Energy$Recycler for cantilever mounting off of the rooftop unit
with out the use of a slab or a roof curb.
b. A supplementary supply air fan kit to provide increased air movement into the 62AQ
c. A field-installed 460v to 308/230v transformer to provide power when the
Energy$Recycler is used with a 460V rooftop unit.
17. EconoMi$er and Power Exhaust:
Package shall provide control of internal building pressure. The two-stage system shall
exhaust up to 100% of return air (vertical only).
18. Two-Stage Power Exhaust Accessory for EconoMi$er:
Power exhaust shall be used in conjunction with EconoMi$er to provide system exhaust of
up to 100% of return air. The power exhaust is a field-installed accessory (vertical and
The individual fans are energized through the end switches located in the actuator, which
will open as the outdoor-air damper opens. These end switches are factory set for 30 and
70% of outdoor-air, and can be set to meet specific job requirements.
19. Outdoor Air Enthalpy Sensor:
The outdoor air enthalpy sensor shall be used with the EconoMi$er device to provide single
enthalpy control. When used in conjunction with a return air enthalpy sensor, the
EconoMi$er device will provide differential enthalpy control. The sensor allows the
EconoMi$er controller to determine if outside air is suitable for free cooling.
20. Return Air Enthalpy Sensor:
The return air enthalpy sensor shall be used with the EconoMi$er device. When used in
conjunction with an outdoor air enthalpy sensor, the EconoMi$er device will provide
differential enthalpy control.
21. Return Air Temperature Sensor:
The return air temperature sensor shall be used with the EconoMi$er device. When used in
conjunction with the standard outdoor air temperature sensor, the EconoMi$er device will
provide differential temperature control.
22. Indoor Air Quality (CO) Sensor: 2a. Shall have the ability to provide demand ventilation indoor air quality (IAQ) control
through the economizer with an IAQ sensor.
b. The IAQ sensor shall be available in duct mount, wall mount, and wall mount with LED
display. The set point shall have adjustment capability.
23. Power Exhaust Auxiliary Transformer:
Field-installed 460v or 575 v to 230 v transformer to provide power to the 230 v power
exhaust when attached to a 460 v or 575 v rooftop unit.
24. Outdoor Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail and flying debris.
25. Alternate Motors and/or Drives (004-006, 008, 012):
Alternate motors and drives shall be factory-installed to provide additional performance
26. High-Static Motor(s) and Drive(s) (50TFQ004-012):
High-static motor(s) and drive(s) shall be factory-installed to provide an additional
27. Outdoor Coil Grille:
The grille protects the outdoor coil from damage by large objects without increasing unit
28. Compressor Cycle Delay:
Unit shall be prevented from restarting for a minimum of 5 min. after shutdown.
29. Salt Spray Protection Package (008-012):
Coil guard protects coil from corrosion in coastal areas and in areas with high sulfur
30. Fan/Filter Status Switch:
Provides status of evaporator fan (ON/OFF) or filter (CLEAN/DIRTY). Status shall be
displayed over communication bus when used with direct digital controls or with an
indicator light at the thermostat.
31. Unit Mounted Disconnect Switch:
Shall be factory-installed. Internally mounted, NEC and UL approved non-fused switch
provides unit power shutoff. Shall be accessible from outside the unit.
32. Convenience Outlet:
Shall be factory-installed and internally mounted with easily accessible 115-v female
receptacle. Shall include 15 amp GFI receptacle with independent fuse protection. Voltage
required to operate convenience outlet shall be provided by a factory-installed step-down
transformer. Shall be accessible from outside the unit.
33. Emergency Heat Package:
When mechanical heating is locked out, auxiliary heat shall be activated when necessary.
34. Ultra-Violet Germicidal Lamps:
Ultra-violet germicidal lamps are designed to eliminate odor causing mold and fungus that
may develop in the wet area of the evaporator section of the unit. The high output, low
temperature germicidal lamps are field installed in the evaporator section of the unit, aimed
at the evaporator coil and condensate pan. The short wave-length ultra-violet light inhibits
and kills mold, fungus and microbial growth. The lamps have an output rating at 45 F in 400 2fpm airflow of 120 microwatts/cm at 1 meter.