Carrier GH5S Single-Stage Heat Pump

Product Overview

This unit is designed utilizing Carrier's non-ozone depleting Puron® refrigerant. Heat pumps with Puron® refrigerant provide a collection of features unmatched by any other family of equipment.

Note: Ratings contained in this document are subject to change at any time. Always refer to the AHRI directory (www.ahridirectory.org) for the most up-to-date ratings information.

Industry Leading Features / Benefits

Efficiency

• 14.3 - 15.2 SEER2 / 11.0 - 12.5 EER2 / 7.5 - 8.1 HSPF2 (depending on unit size and indoor combination installed)
• Microtube technology refrigeration system
• Indoor air quality accessories available

Sound

• Sound levels as low as 69 dBA with accessory sound blanket

Comfort

• System supports programmable or standard thermostat controls

Reliability

• Non-ozone depleting Puron® refrigerant
• Scroll compressor
• Internal pressure relief valve
• Internal thermal overload
• Loss of charge switch
• Filter drier
• Balanced refrigeration system for maximum reliability

Durability

• Protection Package: Solid, durable sheet metal construction
• Dense wire coil guard

Applications

• Long-line: up to 250 feet (76.20 m) total equivalent length, up to 200 feet (60.96 m) condenser above evaporator, or up to 80 ft. (24.38 m) evaporator above condenser (See Longline Guide for more information.)
• Low ambient cooling (down to 0°F/-17.8°C) with approved low ambient accessory kits

Model Number Nomenclature & Ordering

Model Number Nomenclature

The model number is structured to indicate various features and specifications. Key components include:

• Brand Type: G (Entry), H (HP)
• OD Type: SEER2 rating
• OD Design Type: S (Single-Stage)
• Major Series: A-Z
• Voltage: N (208-230-1), P (208-230-3), E (460-3)
• Refrigerant: 4 (R410A)
• Nominal Capacity: e.g., 18 (18,000 BTUH / 1.5 Tons)
• Feature: Standard (0)
• Special Feature: Standard (0)
• Region: A (Standard HP)

Catalog Ordering Numbers

Standard Features

X = Standard

Tested AHRI Combination Ratings: Ratings are subject to change; refer to AHRI directory (www.ahridirectory.org) and MyCarrierRatings.com for details.

Physical Data

Vapor Line Sizing and Cooling Capacity Loss

Acceptable vapor line diameters provide adequate oil return to the compressor while avoiding excessive capacity loss. The suction line diameters shown in the chart below are acceptable for HP systems with Puron® refrigerant.

Standard Length = 80 ft. (24.4 m) or less total equivalent length.

Applications in this area are long line. Accessories are required as shown recommended on Long Line Application Guidelines.

Applications in this area may have height restrictions that limit allowable total equivalent length, when outdoor unit is below indoor unit. See Long Line Application Guidelines.

Refrigerant Piping Length Limitations

The maximum allowable total equivalent length for heat pumps varies depending on the vertical separation. Tables provide allowable lengths based on unit level, outdoor unit above, or outdoor unit below indoor unit.

Maximum Line Lengths for Heat Pump Applications

* Maximum actual length not to exceed 200 ft (61 m).

Maximum Total Equivalent Length* { - Outdoor Unit BELOW Indoor Unit

HP with Puron® Refrigerant - Maximum Total Equivalent Length

*.Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details. -- = outside acceptable range

Long Line Applications

An application is considered Long Line when the refrigerant level in the system requires the use of accessories to maintain acceptable refrigerant management for systems reliability. Defining a system as long line depends on the liquid line diameter, actual length of the tubing, and vertical separation between the indoor and outdoor units.

For Heat Pump systems, the chart below shows when an application is considered Long Line. Beyond these lengths, long line accessories are required:

Note: See Long Line Guideline for details.

Accessories

The following accessories are available for the GH5S unit, indicated by 'X' for availability by unit size:

X = Accessory, S = Standard

Accessory Usage Guideline

This table outlines accessory requirements for Low-Ambient Cooling, Long Line Applications, and Sea Coast Applications.

* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Split-System Longline Application Guideline.

† Standard on 3 phase units only.

Accessory Description and Usage

1. Ball-Bearing Fan Motor

A fan motor with ball bearings which permits speed reduction while maintaining bearing lubrication.

2. Compressor Start Assist - Capacitor and Relay

Start capacitor and relay gives a "hard" boost to compressor motor at each start up. Usage Guideline: Required for single-phase scroll compressors in the following applications: Long line, Low ambient cooling. Suggested for all compressors in areas with a history of low voltage problems.

3. Crankcase Heater

An electric resistance heater which mounts to the base of the compressor to keep the lubricant warm during off cycles. Improves compressor lubrication on restart and minimizes the chance of liquid slugging. Usage Guideline: Required in low ambient cooling applications. Required in long line applications. Suggested in all commercial applications.

4. Cycle Protector

The cycle protector is designed to prevent compressor short cycling. This control provides an approximate 5-minute delay after power to the compressor has been interrupted for any reason, including power outage, protector control trip, thermostat jiggling, or normal cycling.

5. Evaporator Freeze Thermostat

An SPST temperature-actuated switch that stops unit operation when evaporator reaches freeze-up conditions. Usage Guideline: Required when low ambient kit has been added.

6. Low-Ambient Pressure Switch Kit

A long life pressure switch which is mounted to outdoor unit service valve. It is designed to cycle the outdoor fan motor in order to maintain head pressure within normal operating limits (approximately 100 psig to 225 psig). The control will maintain working head pressure at low-ambient temperatures down to 0°F (-18°C) when properly installed and also using wind baffles. Usage Guideline: A Low-Ambient Pressure Switch must be used when cooling operation is used at outdoor temperatures below 55°F (12.8°C).

7. MotorMaster® Low-Ambient Controller

A fan-speed control device activated by a temperature sensor, designed to control condenser fan motor speed in response to the saturated, condensing temperature during operation in cooling mode only. For outdoor temperatures down to 0°F/–17.8°C), it maintains condensing temperature at 100°F ±10°F (37.8°C ±5.5°C). Usage Guideline: A MotorMaster® Low Ambient Controller or Low-Ambient Pressure Switch must be used when cooling operation is used at outdoor temperatures below 55°F (12.8°C).

8. Outdoor Air Temperature Sensor

This device enables the thermostat to display the outdoor temperature. This device is also required to enable special thermostat features such as auxiliary heat lock out. Usage Guideline: Suggested for use with compatible thermostats.

9. Sound Hood

Wraparound sound reducing cover for the compressor. Reduces the sound level of the compressor. Usage Guideline: Suggested when unit is installed closer than 15 ft (4.57 m) to quiet areas, bedrooms, etc. Suggested when unit is installed between two houses less than 10 ft (3 m) apart.

10. Support Feet

Four or five stick-on plastic feet that raise the unit 4 in. (101.6 mm) above the mounting pad. This allows sand, dirt, and other debris to be flushed from the unit base, minimizing corrosion. Usage Guideline: Suggested in the following applications: Coastal installations, Windy areas or where debris is normally circulating, Rooftop installations, For improved sound ratings.

11. Thermostatic Expansion Valve (TXV)

A modulating flow-control valve which meters refrigerant liquid flow rate into the evaporator in response to the superheat of the refrigerant gas leaving the evaporator. Kit includes valve, adapter tubes, and external equalizer tube. Hard shut off types are available. Usage Guideline: Required to achieve AHRI ratings in certain equipment combinations. Refer to combination ratings. Hard shut off TXV or LLS required in air conditioner long line applications. Required for use on all zoning systems.

12. Time-Delay Relay

An SPST delay relay which briefly continues operation of indoor blower motor to provide additional cooling after the compressor cycles off. NOTE: Most indoor unit controls include this feature. For those that do not, use the guideline below. Usage Guideline: For improved efficiency ratings for certain combinations of indoor and outdoor units. Refer to AHRI Directory of Certified Product Performance (AHRI Directory). When a Time-Delay Relay (TDR) is called for in the AHRI Directory, use a 30 second TDR for MicroChannel Indoor units and use a 90 second TDR for Round Tube Plate Fin Indoor units.

13. Winter Start Control

This control is designed to alleviate nuisance opening of the low-pressure switch by bypassing it for the first 3 minutes of operation.

Electrical Data

* Permissible limits of the voltage range at which the unit will operate satisfactorily. † Time-Delay fuse. FLA=Full Load Amps, LRA=Locked Rotor Amps, MCA=Minimum Circuit Amps, RLA=Rated Load Amps.

NOTE: Control circuit is 24-V on all units and requires external power source. Copper wire must be used from service disconnect to unit. All motors/compressors contain internal overload protection. Complies with requirements of ASHRAE Standards 90.1. Short Circuit Current Rating (SCCR): 5kA rms.

Sound Power Level Without Sound Hood

NOTE: Tested in compliance with AHRI 270 but not listed with AHRI.

Sound Power Level With Sound Hood

NOTE: Tested in compliance with AHRI 270 but not listed with AHRI.

Charging Subcooling (TXV-Type Expansion Device)

HP Only Replacement with Piston Indoors

This heat pump may only be installed with piston metered indoor units as replacement components in a piston system. When installing a non-rated heat pump with a piston indoor unit, the correct piston must be installed, which should be listed in the indoor unit Installation Instructions or Product Data. Replacement pistons can be ordered from Replacement Components (RC).

Dimensions

Detailed dimensions for various GH5S models are provided in the table below. These include measurements for A through K, operating weight, and shipping weight.

Diagram Description: The diagram illustrates the unit's dimensions and key reference points (A-K) for measurements, along with connection types and locations.

Pad Application Dimensions: Tables specify minimum ground and roof-top mounting pad dimensions based on unit size.

Clearances

Clearance requirements are illustrated with various examples for wall installations. Recommended clearances include:

• 6" (152.4 mm) from walls for service access.
• 12" (304.8 mm) from walls for general clearance.
• 24" (609.6 mm) from walls for service access.
• 18" (457.2 mm) from walls for service access.
• Allow 48" above the unit.

Important Note: When installing multiple units in an alcove, roof well, or partially enclosed area, ensure there is adequate ventilation to prevent re-circulation of discharge air.

Balance Point Worksheet

This graph illustrates the relationship between outdoor temperature (°F) and the unit's integrated heating capacity (MBTUH and kW). It helps determine the balance point where heating needs match the unit's output, based on indoor air at 70°F and rated CFM.

The graph displays multiple lines, each representing a different model combination (e.g., GH5SAN418**A FJ4DNXA18L*).

Detailed Cooling Capacities & Heat Pump Heating Performance

The document includes extensive tables detailing the cooling capacities and heat pump heating performance across a range of operating conditions. These tables provide data for various:

• Evaporator Airflow (CFM)
• Entering Air Temperatures (°F / °C) for both Evaporator and Condenser
• Cooling Capacities in MBtuh (Total System and Sensible) and kW
• Heating Capacities in MBtuh (Total Integrated and Total System) and kW
• Data is presented for different unit sizes and indoor unit combinations.

These tables are crucial for selecting the appropriate unit and verifying performance under specific environmental conditions.

Guide Specifications

General

System Description

An outdoor-mounted, air-cooled, split-system heat pump unit suitable for ground or rooftop installation. It comprises a hermetic compressor, an air-cooled coil, a propeller-type condenser fan, and a control box. The unit discharges supply air upward and is designed for integration with packaged fan coil or coil units.

Quality Assurance

• Rated according to the latest AHRI Standard 210/240.
• Certified for capacity and efficiency, listed in the latest AHRI directory.
• Construction complies with latest ANSI/ASHRAE and NEC standards.
• Constructed to UL standards, carrying UL and C-UL approval labels.
• Cabinet withstands Federal Test Method Standard No. 141 (Method 6061) 500-hr salt spray test.
• Air-cooled condenser coils are pressure tested; outdoor unit is leak tested.
• Constructed in an ISO9001 approved facility.

Delivery, Storage, and Handling

Shipped as a single package; storage and handling follow manufacturer's recommendations.

Warranty

U.S. and Canada only (for inclusion by specifying engineer).

PRODUCTS

Equipment

Factory-assembled, single-piece, air-cooled heat pump unit containing all factory wiring, piping, controls, compressor, refrigerant charge (Puron®), and special features required for field start-up.

Unit Cabinet

Constructed of galvanized steel, coated with pre-paint. Available with dense grille only.

Fans

Direct-drive propeller type condenser fan discharging air upward. Motors are totally enclosed, 1-phase, class B insulated, permanently lubricated, with corrosion-resistant shafts. Fan blades are statically and dynamically balanced. Openings have steel wire safety guards.

Compressor

Hermetically sealed, mounted on rubber vibration isolators.

Condenser Coil

Air-cooled; constructed of aluminum fins mechanically bonded to copper or aluminum tubes, then cleaned, dehydrated, and sealed.

Refrigeration Components

Include liquid-line and vapor-line shutoff valves (sweat connections), Puron® refrigerant charge, POE compressor oil, accumulator, and reversing valve.

Operating Characteristics

Details on unit capacity, power consumption, and system performance (SEER) under various conditions are specified (blanks indicate values to be filled in by engineer).

Electrical Requirements

Nominal unit electrical characteristics (voltage, phase, Hz) are specified, with acceptable voltage limits. Unit power is single-point connection; control circuit is 24v.

Special Features

Refer to literature for descriptions of specific features and available enhancements.

System Design Summary

1. Intended for outdoor installation with free air inlet and outlet; outdoor fan external static pressure < 0.01-in. wc.
2. Minimum outdoor operating air temperature without low-ambient accessory: 55°F (12.8°C).
3. Maximum outdoor operating air temperature for cooling: 125°F (51.7°C).
4. Minimum outdoor operating air temperature for heating: -10°F (-23.3°C).
5. Maximum outdoor operating air temperature for heating: 66°F (18.9°C).
6. Unit must be level in all horizontal planes for reliable operation.
7. For tubing lengths > 80 ft (23.4 m) and/or elevation differences > 20 ft (6.1 m), consult Residential Piping and Longline Guideline and Service Manual.
8. If refrigerant tubing is buried, provide a 6 in. (152.4 mm) vertical rise to valve connections. Buried lines up to 36 in. (914.4 mm) are permissible.
9. Use only copper wire for electric connections; aluminum and clad aluminum are not acceptable.
10. Do not apply capillary tube indoor coils to these units.
11. Factory-supplied filter drier must be installed.