About AHRI/ISO/ASHRAE | Bryant GT-PG (50YE) specification

Bryant Geothermal Heat Pump Systems

About AHRI/ISO/ASHRAE 13256-1

AHRI/ASHRAE/ISO 13256-1 (Air-Conditioning and Refrigeration Institute/American Society of Heating, Refrigerating and Air Conditioning Engineers/International Standards Organization) is a certiﬁcation standard for water-source heat pumps used in the following applications:

•WLHP (Water Loop Heat Pump – Boiler/Tower)

•GWHP (Ground Water Heat Pump – Open Loop)

•GLHP (Ground Loop Heat Pump – Geothermal)

The directory at http://www.ahrinet.org/ is constantly being updated and immediately available on the Internet. All ratings are submitted by the manufacturer for certiﬁcation, and must be approved by AHRI.Therefore, there is a signiﬁcant difference between AHRI “certiﬁed” and AHRI “rated.”Thirty percent of a manufacturer’s basic models must be tested each year. AHRI selects models at random from stock for testing on the basis of its evaluation of a participant’s certiﬁcation data.

Units that fail one or more certiﬁed test (90% of declared performance or lower) may be declared defective. If the initial failure is a performance test, the manufacturer must obsolete all units within the same basic model group or elect to have a second sample tested. If the second unit fails a performance test, it must be obsoleted, together with all units within the same basic model group. Bryant Geothermal takes certiﬁcation seriously. We were recently awarded a certiﬁcate for consecutive years of no AHRI failures.

Temperatures used in AHRI certiﬁcation standards are S.I. (Système International – metric) based. For example, typical catalog data for cooling is shown at 80°F DB/67°F WB [26.7°C DB/19.4°C] entering air temperature, but the AHRI standard for cooling is 80.6°F DB/66.2°F WB [27°C DB/19°C], since it is based upon whole numbers in degrees Celsius.Water and air temperatures for the standard are shown below.

Test Condition Comparison Table

	WLHP	GWHP	GLHP
Cooling	80.6/66.2 [27/19]	80.6/66.2 [27/19]	80.6/66.2 [27/19]
Entering Air Temperature - DB/WB °F [°C]	80.6/66.2 [27/19]	80.6/66.2 [27/19]	80.6/66.2 [27/19]
Entering Water Temperature - °F [°C]	86 [30]	59 [15]	77 [25]
Fluid Flow Rate	*	*	*
Heating	68 [20]	68 [20]	68 [20]
Entering Air Temperature - DB/WB °F [°C]	68 [20]	68 [20]	68 [20]
Entering Water Temperature - °F [°C]	68 [20]	50 [10]	32 [0]
Fluid Flow Rate	*	*	*

*Flow rate is speciﬁed by the manufacturer

Data certiﬁed by AHRI include heating/cooling capacities, EER (Energy Efﬁciency Ratio – Btuh per Watt) and COP (Btuh per Btuh) at the various conditions shown above. Pump power correction is calculated to adjust efﬁciencies for pumping Watts.Within each model, only one water ﬂow rate is speciﬁed for all three groups, and pumping Watts are calculated using the formula below.This additional power is added onto the existing power consumption.

• Pump power correction = (gpm x 0.0631) x (Press Drop x 2990)/300

Fan power is corrected to zero external static pressure using the equation below.The nominal airﬂow is rated at a speciﬁc external static pressure.This effectively reduces the power consumption of the unit and increases cooling capacity but decreases heating capacity.

• Fan Power Correction = (cfm x 0.472) x (esp x 249)/300

Capacities and efﬁciencies are calculated using the following equations:

•ISO Cooling Capacity = Cooling Capacity (Btuh) + [Fan Power Correction (Watts) x 3.412]

•ISO EER Efﬁciency (Btuh/W) =

ISO Cooling Capacity (Btuh)/[Power Input (Watts) – Fan Power Correction (Watts) + Pump Power Correction (Watts)]

•ISO Heating Capacity = Heating Capacity (Btuh) – [Fan Power Correction (Watts) x 3.412]

•ISO COP Efﬁciency (Btuh/Btuh) =

ISO Heating Capacity (Btuh) x 3.412/[Power Input (Watts) - Fan Power Correction (Watts) + Pump Power Correction (Watts)]

	Residential Products Technical Guide	GT-PG
	Residential Products Technical Guide	7
		7

GT-PG (50YE) specifications

The Bryant GT-PG (50YE) is a state-of-the-art gas-fired packaged unit ideal for both commercial and residential applications. Renowned for its efficiency and reliability, this model stands out in the competitive HVAC market. With its sleek design and advanced features, it promises optimal performance while maintaining energy efficiency, making it a favorite among building owners and contractors alike.

One of the most remarkable features of the Bryant GT-PG (50YE) is its high-efficiency gas heat exchanger. This component enhances energy transfer, ensuring that maximum heat is produced with minimal energy consumption. With an Annual Fuel Utilization Efficiency (AFUE) rating that meets and exceeds industry standards, users can count on significant savings in energy bills over time. Additionally, the unit is equipped with a multi-speed blower that further enhances its efficiency by providing a consistent flow of air while reducing noise levels.

Another significant characteristic of the GT-PG (50YE) is its advanced control system. Featuring a user-friendly interface, this system allows for precise temperature control and integration with smart home technologies. The modulating gas valve optimizes performance based on heating demand, providing customized comfort for any environment.

Reliability is key with the Bryant GT-PG (50YE). It is built with sturdy materials designed to withstand the elements, enhancing its lifespan and reducing maintenance needs. The inclusion of a robust stainless steel heat exchanger aids in preventing corrosion, ensuring durability in various climates.

Moreover, safety features are paramount in the design of the GT-PG (50YE). It includes integrated safety controls, such as a flame rollout switch and limit control, providing peace of mind for users.

Installation and maintenance are made easy with this model, which includes a compact design allowing for versatile placement options. Service access has been thoughtfully designed, ensuring technicians can perform routine maintenance without hassle.

In conclusion, the Bryant GT-PG (50YE) is a powerhouse of an HVAC solution, blending efficiency, reliability, and advanced technology. With its exceptional heating capabilities, user-friendly controls, and durable construction, this model is perfect for anyone looking to invest in long-term comfort and performance. Whether for residential or commercial use, the GT-PG reflects Bryant's commitment to quality and customer satisfaction.