York GY9S*DH, GM9S*DH, GF9S*DH installation manual Section VI Twinning and Staging

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ACCESSORY CONNECTIONS

The furnace control will allow power-switching control of various acces- sories. Refer to Figure 12, for connection details.

HUM. HOT

115 VOLT

BLK

 

WHT

 

HUMIDIFER

 

 

 

 

 

 

 

EAC

SWITCHED

 

 

HUM

CIRCUITS

EAC HOT

 

 

 

115 VOLT

BLK

 

ELECTRONIC

WHT

 

AIR CLEANER

 

 

 

NEUTRALS

 

 

 

 

FIGURE 12: Accessory Connections

ELECTRONIC AIR CLEANER CONNECTION

Two 1/4” (0.64 cm) spade terminals (EAC and NEUTRAL) for electronic air cleaner connections are located on the control board. The terminals provide 115 VAC (1.0 amp maximum) during circulating blower opera- tion.

268890-UIM-B-0607

TWINNING DUCT SYSTEM

Twinned furnaces must only be applied on a common duct system. A single air supply plenum must be used for both furnaces and coil(s). Separate plenums and supply ducts systems cannot be utilized. A sin- gle return air plenum, common to both furnaces must be used.

Both furnaces must be identical models in both heating capacity and CFM capacity. Both furnaces must be operated on the same motor speed tap. See typical application, Figure 13.

If furnace staging is desired with two single stage furnaces on a com- mon duct, where the gas burner on the first furnace operates on W1 and the gas burner on the second furnace operates on W2, then the use of an air-mixing device in the plenum to mix the air from both fur- naces is strongly recommended. The mixing device must be installed before any ducts that supply air to occupied spaces. Twinning causes both indoor fans to operate simultaneously. If a mixing device is not used, any ducts that are connected down stream from the furnace that operates on W2, will be supplying cold air in the Heating mode to the occupied spaces unless W2 is energized.

VENT PIPE

HUMIDIFIER CONNECTION

Two 1/4” (0.64 cm) spade terminals (HUM and NEUTRAL) for humidi- fier connections are located on the control board. The terminals provide 115 VAC (1.0 amp maximum) during heating system operation.

SECTION VI: TWINNING AND STAGING

NOTE: You can twin two furnaces that have the same integrated control module. Check the part number on the integrated control module. You cannot twin two furnaces that have different integrated control module part numbers. If the part numbers of the two integrated control modules

ELECTRICAL

SUPPLY

SUPPLYCOMMON

PLENUM

GAS SUPPLY (BOTH SIDES)

1 COIL FOR EACH FURNACE

SUPPLY

AIR

are different they may not communicate with each other so they will not work in a twinning application.

In applications where more heating capacity or more airflow capacity is needed than what one furnace can deliver, twinning can be used to make two furnaces operate in tandem. When two furnaces are installed using the same duct system, it is very important that the two furnace cir- culating air blowers operate in unison. If one blower starts before the second blower, the duct system will become pressurized and the blower on the second furnace will turn backwards causing the second furnace to overheat, resulting in damage to the furnace. Twinning is used to make two furnaces operate in tandem, using one duct system, one room thermostat and causing both furnaces to turn on and off simulta- neously.

Before installing the relay and wiring, disconnect electrical power to both furnaces. Failure to cut power could result in electrical shock or equipment damage.

The relay must not be installed in any location where it could be exposed to water. If the relay has been exposed to water in any way, it must not be used.

FIGURE 13: Typical Twinned Furnace Application

IMPORTANT: When two furnaces are twinned, typical system total air- flow will be approximately 85% of additive individual furnaces, i.e., two 2000 CFM (56.6 m3/m) units will yield a total 3400 CFM (96.3 m3/m).

GAS PIPING

Furnace gas supplies must be provided as specified with these instruc- tions. Since the furnaces are side by side, with no space between, gas supplies must enter on the right and left respectively. All gas piping must be in accordance with the national fuel gas code, ANSI Z223.1, latest edition, and/or all local code or utility requirements.

TWINNING

In applications where more heating capacity or more airflow capacity is needed than what one furnace can deliver, twinning can be used to make two furnaces operate in tandem, using one duct system and one room thermostat. When one duct system is used for two furnaces, it is necessary that the two blowers operate in unison. The twinning function of the board in this furnace ensures that both blowers turn on and off simultaneously, and operate on the same blower speed.

Single-Wire Twinning

The control in the furnace has the single-wire twinning feature. With this feature, a single wire is connected between the TWIN terminal on one furnace board to the TWIN terminal on the second furnace board. The board then communicates the blower status from one furnace to the other along this wire. This communication makes the second furnace blower come on at the same time, and on the same speed, as the first furnace blower.

Unitary Products Group

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Contents List of Sections Section I SafetyList of Figures List of TablesSafety Requirements Specific Safety Rules and PrecautionsAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Combustion AIR Quality List of ContaminantsFurnace Location and Clearances InspectionDirectly BELOW. Keep Clear of ALL OBSTRUC- Tions Ductwork Installation Floor Base and Ductwork InstallationSection II Ductwork Ductwork General InformationReturn1 Rectangular2 Round2 Supply3 InputRound Duct Size Horizontal Installations Without a Cooling Coil Cabinet Horizontal Installations With a Cooling Coil CabinetDownflow Air Conditioning Coil Cabinet Horizontal ModelsSection III Filters Filter InstallationCFM Suspended Furnace / Crawl Space Installation Attic InstallationDownflow Filters Horizontal ApplicationSection IV GAS Piping Electrical Power Connections Section V Electrical PowerAfue Supply Voltage Connections LOW Voltage Control Wiring ConnectionsAC1 Section VI Twinning and Staging Section VII Combustion AIR and Vent System Combustion AIR and Vent SafetyStaging Model Input Pipe Size Maximum Combustion AIR/VENT Pipe SizingElbow Dimension Combustion AIR and Vent Piping AssemblyCombustion AIR / Vent Clearances Furnace Vent Connection SizesHome Layout Vent ClearancesHorizontal Vent Assembly Downflow Vent AssemblyVent System Horizontal Vent Applications and TerminationVenting Multiple Units Vertical Vent Applications TerminationCombustion AIR Supply Outdoor Combustion AirCombustion Air Source From Outdoors Ambient Combustion Air SupplyDampers, Louvers and Grilles Canada Only BtuhVentilated Combustion Air Vent and Supply Outside Air Safety Check ProcedureVentilated Combustion Air Termination Condensate Drain Section Viii Condensate PipingCondensate Drain Trap and Drain Freeze Protection Condensate Drain Hose Part NumbersHorizontal Left Air Flow Inducer Low Refer to Figures 31 Hose #5 Hose #1Hose #9 Hose #4 Hose #6 Horizontal Right Air Flow Inducer High Refer to Figures Unitary Products Group HOSE#1 Hose #2 Barbed TEE Hose #4 Hose #7 Hose #9 Section X START-UP Adjustments Section IX Safety ControlsCalculating the Furnace Input Natural GAS Ignition System SequenceUSA use the following formula to calculate the furnace input Inlet GAS Pressure Range Adjustment of Manifold GAS PressureNominal Manifold Pressure Reading the gas pressure with the burner box cover in placeAdjustment of FAN Control Settings Adjustment of Temperature RiseWith Burner BOX Cover in Place With Burner BOX Cover RemovedDiagnostic Fault Code Storage and Retrieval Furnace Control DiagnosticsSlow Green Flash Normal operation Ignition ControlModels Filter PerformanceAirflow Range Minimum Filter Type Opening Size Disposable PleatedApplying Filter Pressure Drop to Determine System Airflow Field Installed Accessories NON-ELECTRICALModel no Description Used with Section XI Wiring Diagram Unitary 5005 Norman Product York Group Drive 73069

GF9S*DH, GY9S*DH, GM9S*DH specifications

The York GM9S*DH, GF9S*DH, and GY9S*DH series air conditioning systems are known for their robust performance, reliability, and energy efficiency. These models are well-suited for both residential and light commercial applications, making them versatile options for a range of users.

One of the standout features of these systems is their high efficiency. The GM9S*DH is equipped with advanced heating and cooling technologies that allow it to achieve excellent SEER (Seasonal Energy Efficiency Ratio) ratings. This translates to lower energy consumption and reduced utility bills for homeowners and business operators alike. The GF9S*DH model further enhances this efficiency by incorporating variable-speed blowers that adjust airflow based on specific needs, ensuring that the system operates only as necessary.

Reliability is another key characteristic of the York GM9S*DH, GF9S*DH, and GY9S*DH series. These models are engineered with durable components and rigorous performance testing, which contributes to their long lifespan and minimizes the need for repairs. Moreover, they come with robust warranties that provide peace of mind for consumers.

In terms of technology, these units utilize a smart thermostat feature that allows for precise temperature control and programmable settings. This feature not only enhances comfort but also contributes to energy savings by allowing users to set optimal cooling or heating schedules. The systems are also designed with quiet operation in mind, employing sound-dampening features that minimize noise levels, which is particularly beneficial for residential installations.

The installation of the York GM9S*DH, GF9S*DH, and GY9S*DH systems is straightforward, offering flexibility in placement and integration with various home or office setups. Their compact design allows them to fit seamlessly into different environments without compromising on performance.

Additionally, the systems are equipped with advanced filtration options that improve indoor air quality by capturing allergens and pollutants. This is particularly beneficial for families with children or members who suffer from allergies.

Overall, the York GM9S*DH, GF9S*DH, and GY9S*DH series provide exceptional performance, energy efficiency, and reliability, making them an ideal choice for maintaining a comfortable indoor environment. With their cutting-edge technologies and user-friendly features, these systems represent an excellent investment for anyone looking to enhance their heating and cooling experience.
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