York GF9S*DH Section VII Combustion AIR and Vent System, Staging, Combustion AIR and Vent Safety

Page 14

268890-UIM-B-0607

Single-Wire Twinning Instructions

Connect the control wiring as shown in the Figure 14.

1.Connect the low voltage wiring from the wall thermostat to the ter- minal strip on the control board of Furnace #1.

2.Connect a wire from the TWIN terminal of Furnace #1 to the TWIN terminal of Furnace #2.

3.Install a separate 24V relay as shown in the diagram below. Use of this relay is required, as it ensures that the transformers of the two furnaces are isolated, thus preventing the possibility of any safety devices being bypassed.

Single-Wire Twinning Operation

Heating - On a call for heat (W signal) from the wall thermostat, both furnaces will start the ignition sequence and the burners on both fur- naces will light. About thirty seconds after the burners light, the blowers on both furnaces will come on in heating speed. When the thermostat is satisfied, the burners will all shut off and, after the selected blower off delay time, both blowers will shut off at the same time. The twinning control ensures that both blowers come on and shut off at the same time.

Cooling - On a call for cooling (Y signal) from the wall thermostat, both furnace blowers will come on at the same time in cooling speed. When the thermostat is satisfied, both blowers will stay on for 60 seconds, then will shut off at the same time.

Single-Wire Staging Instructions

Connect the control wiring as shown in the Figure 15.

1.Connect the low voltage wiring from the wall thermostat to the ter- minal strip on the control board of Furnace #1. For staging applica- tions, the wire from thermostat W1 is connected to the W connection on the board on Furnace #1. The wire from thermostat W2 is connected to Furnace #2 through a separate relay, as described below.

2.Connect a wire from the TWIN terminal of Furnace #1 to the TWIN terminal of Furnace #2.

3.Install a separate 24V relay as shown in the diagram below. Use of this relay is required, as it ensures that the transformers of the two furnaces are isolated, thus preventing the possibility of any safety devices being bypassed.

Single-Wire Staging Operation

Heating - On a call for first-stage heat (W1 signal) from the wall thermo- stat, Furnace #1 will start the ignition sequence and the burners will light. About thirty seconds after the burners light, the blowers on both furnaces will come on in heating speed. When the thermostat is satis- fied, the burners will shut off and, after the selected blower off delay time, both blowers will shut off at the same time. On a call for second stage of heat, the burners of Furnace #2 will also light and both blowers will run. The twinning control ensures that both blowers come on and shut off at the same time.

Continuous Fan - On a thermostat call for continuous fan (G signal), both furnace blowers will come on at the same time in cooling speed and will stay on until the G signal is removed.

FURNACE 1 CONTROL BOARD

 

FURNACE 2 CONTROL BOARD

W

 

 

 

 

W

 

G

 

 

 

 

G

 

C

 

 

 

 

C

 

R

TWIN

 

 

 

R

TWIN

Y

 

 

ISOLATION

Y

 

 

 

 

 

 

 

 

 

 

RELAY

 

 

TO A/C

W

G

R

Y

 

 

 

WALL THERMOSTAT

 

 

FIGURE 14: Single Stage Twinning Wiring Diagram

STAGING

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. This control can also be used along with a two-stage wall thermostat to stage two twinned furnaces, making them operate like a single two-stage furnace. This allows only one furnace to supply heat during times when the heat output from one furnace is sufficient to satisfy the demand. When one duct system is used for two furnaces, it is necessary that the two blowers operate in unison. The twinning func- tion of this board ensures that both blowers turn on and off simulta- neously, and operate on the same blower speed. Even when only one furnace is supplying heat, both furnace blowers must run.

Single-Wire Staging

The single-wire twinning feature of this board can also be used for stag- ing of two furnaces. 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 communica- tion makes the second furnace blower come on at the same time, and on the same speed, as the first furnace blower.

Cooling - On a call for cooling (Y signal) from the wall thermostat, both furnace blowers will come on at the same time. When the thermostat is satisfied, both blowers will stay on for 60 seconds, then will shut off at the same time.

Continuous Fan - On a thermostat call for continuous fan (G signal), both furnace blowers will come on at the same time in cooling speed and will stay on until the G signal is removed.

FURNACE 1 CONTROL BOARD

 

 

 

FURNACE 2 CONTROL BOARD

W

 

 

 

 

W

 

G

 

 

 

 

G

 

C

 

 

 

 

C

 

R

TWIN

 

 

 

R

TWIN

Y

 

 

ISOLATION

Y

 

 

 

 

 

 

 

 

 

RELAY

 

 

TO A/C

W1 G

R

Y

W2

 

 

 

WALL THERMOSTAT

 

 

FIGURE 15: Two-Stage Twinning Wiring Diagram

SECTION VII: COMBUSTION AIR AND VENT SYSTEM

COMBUSTION AIR AND VENT SAFETY

This Category IV, dual certified direct vent furnace is designed for resi- dential application. It may be installed without modification to the con- densate system in a basement, garage, equipment room, alcove, attic or any other indoor location provided the space temperature is 32 °F (0°C) or higher and where all required clearance to combustibles and other restrictions are met. The combustion air and the venting system must be installed in accordance with Section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas Code Z223.1/NFPA 54 (latest edition), or Sections 7.2, 7.3 or 7.4 of CSA B149.1, National Gas and Propane Codes (latest edition) or applicable provisions of the local building code and these instructions.

IMPORTANT: The “VENT SYSTEM” must be installed as specified in these instructions for Residential and Non HUD Modular Homes. The sealed combustion air / vent system is the only configuration that can be installed in a Non HUD Modular Home.

14

Unitary Products Group

Page 13 Page 15
Image 14
Page 13 Page 15
Contents List of Figures Section I SafetyList of Sections List of TablesAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Specific Safety Rules and PrecautionsSafety Requirements Combustion AIR Quality List of ContaminantsDirectly BELOW. Keep Clear of ALL OBSTRUC- Tions InspectionFurnace Location and Clearances Section II Ductwork Floor Base and Ductwork InstallationDuctwork Installation Ductwork General InformationRound Duct Size InputReturn1 Rectangular2 Round2 Supply3 Downflow Air Conditioning Coil Cabinet Horizontal Installations With a Cooling Coil CabinetHorizontal Installations Without a Cooling Coil Cabinet Horizontal ModelsCFM Filter InstallationSection III Filters Downflow Filters Attic InstallationSuspended Furnace / Crawl Space Installation Horizontal ApplicationSection IV GAS Piping Afue Section V Electrical PowerElectrical Power Connections LOW Voltage Control Wiring Connections Supply Voltage ConnectionsAC1 Section VI Twinning and Staging Staging Combustion AIR and Vent SafetySection VII Combustion AIR and Vent System Combustion AIR/VENT Pipe Sizing Model Input Pipe Size MaximumCombustion AIR / Vent Clearances Combustion AIR and Vent Piping AssemblyElbow Dimension Furnace Vent Connection SizesVent Clearances Home LayoutVent System Downflow Vent AssemblyHorizontal Vent Assembly Horizontal Vent Applications and TerminationCombustion AIR Supply Vertical Vent Applications TerminationVenting Multiple Units Outdoor Combustion AirDampers, Louvers and Grilles Canada Only Ambient Combustion Air SupplyCombustion Air Source From Outdoors BtuhVentilated Combustion Air Termination Vent and Supply Outside Air Safety Check ProcedureVentilated Combustion Air Condensate Drain Trap and Drain Freeze Protection Section Viii Condensate PipingCondensate Drain Condensate Drain Hose Part NumbersHose #5 Hose #1 Horizontal Left Air Flow Inducer Low Refer to Figures 31Hose #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 IX Safety Controls Section X START-UP AdjustmentsIgnition System Sequence Calculating the Furnace Input Natural GASUSA use the following formula to calculate the furnace input Nominal Manifold Pressure Adjustment of Manifold GAS PressureInlet GAS Pressure Range Reading the gas pressure with the burner box cover in placeWith Burner BOX Cover in Place Adjustment of Temperature RiseAdjustment of FAN Control Settings With Burner BOX Cover RemovedSlow Green Flash Normal operation Furnace Control DiagnosticsDiagnostic Fault Code Storage and Retrieval Ignition ControlAirflow Range Minimum Filter Type Opening Size Disposable Filter PerformanceModels PleatedModel no Description Used with Field Installed Accessories NON-ELECTRICALApplying Filter Pressure Drop to Determine System Airflow 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.
Top Page Image Contents