Bryant GT-PG (50YE) manual GT-PG ECM Control Features

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Bryant Geothermal Heat Pump Systems

GT-PG ECM Control Features

The ECM fan is controlled by an interface board that converts thermostat inputs and field selectable CFM settings to signals used by the ECM motor controller.

Units manufactured before July 2005 have version I (P/N 69243707). Units manufactured between July 2005 and May 11, 2009 have version II (P/N 17B0019N01). Fan speeds are selected with jumpers for version I or via a nine position DIP switch for version II and III. To take full advantage of the ECM motor features, a multi-stage thermostat should be used (2-stage heat/2-stage cool or 3-stage heat/2-stage cool).

HFC-410A packaged units built after May 11, 2009 have a ECM controllers version III (P/N 17B0034N01). This controller includes logic and a relay to control the HWG functions.

Note: Power must be off to the unit for at least three seconds before the ECM motor will recognize a speed change. The motor will recognize a change in the CFM Adjust or dehumidification mode settings while the unit is powered.

There are four different airflow settings from lowest airflow rate (speed tap 1) to the highest airflow rate (speed tap 4). The charts below indicate settings for both versions of the ECM interface board, followed by detailed information for each setting.

Cooling Settings: The cooling setting determines the cooling (normal) CFM for all units with ECM motor. Cooling (normal) setting is used when the unit is not in dehumidification mode. This setting also determines the heating CFM for GT-G (50YC) units. Tap 1 is the lowest CFM setting, while tap 4 is the highest CFM setting. To avoid air coil freeze-up, tap 1 may not be used if the dehumidification mode is selected. Consult submittal data or specifications catalog for the specific unit series and model to correlate speed tap setting to airflow in CFM.

Heating Settings: The heating setting determines the heating CFM for GT-PX (50YD) and GT-PG (50YE) units. This setting is not used for GT-G (50YC) units. Tap 1 is the lowest CFM setting, while tap 4 is the highest CFM setting. Consult submittal data or specifications catalog for the specific unit series and model to correlate speed tap setting to airflow in CFM.

Auxiliary/Emergency Heat Settings: The auxiliary/ emergency heat setting determines the CFM when the unit is in auxiliary heat or emergency heat mode. This setting is used for residential units with internal electric heat. When auxiliary electric heat is energized (i.e. compressor and electric heat), the greater of the auxiliary/emergency

or heating setting will be used. A “G” (fan) signal must be present from the thermostat for electric heat to operate. Consult the submittal data or specifications catalog for the specific unit series and model to correlate speed tap setting to airflow in CFM.

CFM Adjust Settings: The CFM adjust setting allows four selections. The NORM setting is the factory default position. The + or – settings adjust the airflow by +/- 15%. The +/- settings are used to “fine tune” airflow adjustments. The TEST setting runs the ECM motor at 70% torque, which causes the motor to operate like a standard PSC motor, and disables the CFM counter.

Dehumidification Mode Settings: The dehumidification mode setting provides field selection of humidity control. When operating in the normal mode, the cooling airflow settings are determined by the cooling tap setting above. When dehumidification is enabled there is a reduction in airflow in cooling to increase the moisture removal of the heat pump. Consult submittal data or specifications catalog for the specific unit series and model to correlate speed tap to airflow in CFM. The dehumidification mode can be enabled in two ways.

1.Constant Dehumidification Mode: When the dehumidification mode is selected (via DIP switch or jumper setting), the ECM motor will operate with a multiplier applied to the cooling CFM settings (approx. 20-25% lower airflow). Any time the unit is running in the cooling mode, it will operate at the lower airflow to improve latent capacity. The “DEHUM” LED will be illuminated at all times. Heating airflow is not affected. NOTE: Do not select dehumidification mode if cooling setting is tap 1.

2.Automatic (Humidistat-controlled) Dehumidification Mode: When the dehumidification mode is selected (via DIP switch or jumper setting) AND a humidistat is connected to terminal DH (version II) or HUM (version I), the cooling airflow will only be reduced when the humidistat senses that additional dehumidification is required. The DH (or HUM) terminal is reverse logic. Therefore, a humidistat (not dehumidistat) is required. The “DEHUM” LED will be illuminated only when the humidistat is calling for dehumidification mode. Heating airflow is not affected. NOTE: Do not select dehumidification mode if cooling setting is tap 1.

Residential Products Technical Guide

GT-PG

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Contents GT-PG 50YE Packaged Series GT-PG 50YE Series Table of ContentsTin-Coated Air Coil Other New FeaturesWhats New with Bryant Geothermals GT-PG? Puron RefrigerantGT-PG Design Features Options & Accessories Series Revision Level Unit Model KeyAbout AHRI/ISO/ASHRAE About AHRI/ISO/ASHRAETest Condition Comparison Table Btuh AHRI/ISO/ASHRAE/ANSI 13256-1 PerformanceGround Water Heat Pump Ground Loop Heat Pump Btuh/WCooling Reference Calculations & Legend75% PowerSensible Power Air Flow Correction FactorsEntering Air Correction Factors Air DBFAir WBF Performance Data Selection Notes This is due to the potential of the refrigerant temperaturePSI EER LAT Performance Data GT-PG Model 018 PSC BlowerPerformance Data GT-PG Model 018 ECM Blower PSI Performance Data GT-PG Model 024 PSC BlowerOperation Not recommended Performance Data GT-PG Model 024 ECM BlowerPerformance Data GT-PG Model 030 PSC Blower AOperation Performance Data GT-PG Model 030 ECM BlowerPerformance Data GT-PG Model 036 PSC Blower Performance Data GT-PG Model 036 ECM Blower 110 Performance Data GT-PG Model 042 PSC BlowerPerformance Data GT-PG Model 042 ECM Blower Performance Data GT-PG Model 048 PSC Blower Operation Performance Data GT-PG Model 048 ECM BlowerPerformance Data GT-PG Model 060 PSC Blower Performance Data GT-PG Model 060 ECM Blower Performance Data GT-PG Model 070 ECM Blower Physical Data Dimensions Vertical Upflow GT-PG 50YE Series Return Discharge Connection Return ConnectionDimensions Vertical Downflow GT-PG 50YE Series Floor Foot Print Dimensions Horizontal GT-PG 50YE Series +/- 0.20 in, +/- 5.1mm Model 1Discharge Connection Return ConnectionElectrical Data GT-PG ECM Electrical Wiring Diagram 96B0005N37 GT-PG PSC Electrical Wiring Diagram 96B0005N36 Bryant Whatever it Takes GT-PG ECM Control Features ECM Board Tap Settings 640 800 400 500 620 ECM Blower Performance DataAux In. wgAirflow cfm at External Static Pressure in. wg PSC Blower Performance DataKW Rating Btuh Rating Minimum Auxiliary Electric Heat Auxiliary Heat RatingsAuxiliary Heat Electrical Data AuxiliaryEngineering Guide Specifications Accessories & Warranty Warranty Information Accessories & OptionsGT-PG 50YE Series Bryant Geothermal Heat Pump Systems Revision History ECM Electrical Data Updated

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.
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