Goodman Mfg GHS8 XIII. Operational Checks, Temperature Rise Measurement, Adjustment Switches

Page 25

TEMPERATURE RISE

Air temperature rise is the temperature difference between supply and return air. The proper amount of temperature rise is usually obtained when the unit is operated at the rated input with the “as shipped” blower speed. If the correct amount of temperature rise is not obtained, it may be necessary to change the blower speed.

An incorrect temperature rise can cause condensing in or overheating of the heat exchanger. Determine and adjust the temperature rise as follows. The temperature rise must be within the range specified on the rating plate or Product Data Book applicable to your model*.

HEAT EXCHANGER

RADIATION "LINE OF SIGHT"

SUPPLY

AIR

TSUPPLY

RISE = TSUPPLY - TRETURN

TRETURN

RETURN

AIR

Temperature Rise Measurement

1.

Operate furnace with burners firing approximately 15

 

minutes. Ensure all registers are open and all duct dampers

 

are in their final (fully or partially open) position.

2.

Place thermometers in the return and supply ducts as

To adjust the circulator blower speed, proceed as follows:

1.Turn OFF power to the furnace.

2.Select the heating and cooling blower speeds that match the installation requirements from the airflow table in the Product Data Book applicable to your model.

3.Relocate desired motor leads to the circulator blower heat and cool speed terminals on the integrated control module. (Terminals are identified as HEAT and COOL (hot)). If heating and cooling blower speeds are the same, a jumper wire must be used between the heat and cool terminals. This wire is provided in the literature package.

4.Connect all unused blower motor leads to the “PARK” terminals on the integrated control module. Any leads not connected to the “PARK” terminals must be taped.

5.Turn ON power to furnace.

6.Verify proper temperature rise as outlined in Temperature Rise section.

CIRCULATOR BLOWER FAN TIMING ADJUSTMENT

NOTE: Items in this section refer to the air circulator blower fan, NOT to the induced draft blower. The induced draft blower timing sequence is not adjustable. The circulator blower fan timing is adjustable only on models with optional “heating fan OFF delay” adjustment pins or switches. It is NOT adjustable in any other circumstances.

As shipped, the circulator blower fan will remain on for 90 seconds after the gas valve closes. When a call for cooling occurs, the circulator fan comes on and remains on for 45 seconds after the call for cooling ends. During normal heating operation, the circulator fan will come on approximately 37 seconds after the gas valve opens.

 

close to the furnace as possible. Thermometers must not

 

be influenced by radiant heat by being able to “see” the

 

heat exchanger.

3.

Subtract the return air temperature from the supply air

 

temperature to determine the air temperature rise. Allow

 

adequate time for thermometer readings to stabilize.

4.

Adjust temperature rise by adjusting the circulator blower

 

speed. Increase blower speed to reduce temperature rise.

90

SECOND

DELAY

150

SECOND DELAY

2

 

 

1

 

 

 

 

 

 

 

2

 

 

 

 

1

 

 

 

 

 

 

 

120

SECOND DELAY

180

SECOND DELAY

2

 

 

 

1

 

 

 

 

 

 

NO

 

 

 

 

 

2

 

 

 

 

 

 

1

 

 

 

 

 

 

NO

 

 

 

 

 

Decrease blower speed to increase temperature rise.

Refer to the following section for speed changing details.

CIRCULATOR BLOWER SPEED ADJUSTMENT

WARNING

TO AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, TURN OFF POWER TO THE FURNACE BEFORE CHANGING SPEED TAPS.

This furnace is equipped with a PSC circulator blower motor. This blower provides ease in adjusting blower speeds. The Product Data Book applicable to your model provides an airflow table showing the relationship between airflow (CFM) and external static pressure (E.S.P.) and a table for the proper selection of heating and cooling speeds. The cooling blower speed is shipped set on HIGH, and the heating blower speed is set as indicated in the Product Data Book. These blower speeds should be adjusted by the installer to match the installation requirements so as to provide the correct heating temperature rise and the correct cooling CFM.

Switches viewed in an upflow installation.

Adjustment Switches

XIII. OPERATIONAL CHECKS

WARNING

TO AVOID PERSONAL INJURY OR DEATH, DO NOT REMOVE ANY INTERNAL COMPARTMENT COVERS OR ATTEMPT ANY ADJUSTMENT. ELECTRICAL COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS. CONTACT A QUALIFIED SERVICE AGENT AT ONCE IF AN ABNORMAL FLAME APPEARANCE SHOULD DEVELOP.

BURNER FLAME

The burner flames should be inspected with the burner compartment door installed. Flames should be stable, quiet, soft, and blue (dust may cause orange tips but they must not be yellow). Flames should extend directly outward from the burners without curling, floating, or lifting off. Flames must not impinge on the sides of the heat exchanger firing tubes.

IO-242C

25

05/05

 

 

Page 24 Page 26
Image 25
Page 24 Page 26
Contents Installation & Operating Table of Contents XIV. Safety Circuit Description XII. Start-up Procedure and AdjustmentXV. Troubleshooting XVI. MaintenanceTo the Installer II. SafetyHomeowner Notice To the OwnerAmerican National Standards Institute III. Product ApplicationNational Fire Protection Association CSA InternationalNational Fire Protection Association, Inc IV. Location Requirements and ConsiderationsGeneral Horizontal Installation Clearances and AccessibilitySuspended Furnace Existing Furnace RemovalThermostat Influences Z223.1 Section GeneralEquipment Located in Unconfined Spaces Equipment Located in Confined Spaces Space, UnconfinedVI. Category I Venting Vertical Venting Specially Engineered InstallationsLouvers and Grilles Model Minimum VentVII. Exterior Masonry Chimneys Category I Furnaces only Checklist SummaryUpflow Rotated Induced Draft Blower Typical Multiple Flue Clay Tile ChimneyTermination More Than 10 Feet From Ridge, Wall or Parapet Termination 10 Feet Or Less From Ridge, Wall or ParapetCheck 1 Proper Chimney Termination Check 7 Complete the Installation Check 4 Debris in CleanoutCheck 3 Chimney Crown Condition Check 5 Liner ConditionFIX 2 -CHANGE Venting Arrangements VIII. Electrical ConnectionsFIX 3 Rebuild the Crown FIX 4 ReliningIntegrated Ignition Control Wiring HarnessVolt Line Connections Fossil Fuiel ApplicationsVolt Thermostat Wiring Typical Field Wiring 24 VAC Control CircuitSetting the Heat Anticipator Heating Heating/Cooling Room ThermostatTwinning IX. GAS Supply and PipingHigh Altitude Derate 904BNA does not require a switch change Pressure Switch Changes Furnace input Kbtu/hrFiring Rate Propane GAS ConversionGeneral Furnace Layout Upflow InstallationsGAS Piping Connections General Counterflow Installations Propane Gas Installation TypPropane GAS Piping Charts GAS Piping ChecksXI. Sequence of Operation Integrated Ignition Control Circulating AIR and FiltersDuctwork Air White-Rodgers Model 36F22 XII. START-UP Procedure and AdjustmentWhite-Rodgers Model 36G22 Measuring Inlet Gas Pressure Alternate Method White-Rodgers Model 36G22GAS Supply Pressure Measurement WHITE-RODGERS 36F22 GAS ValveGAS Input Rate Measurement Natural GAS only GAS Manifold Pressure Measurement and AdjustmentAdjustment Switches Temperature Rise MeasurementXIII. Operational Checks XV. Troubleshooting XIV. Safety Circuit DescriptionBurner Flame XVI. Maintenance Igniter Qualified Servicer only Flame Sensor Qualified Servicer onlyUpright Filter Removal Induced Draft and Circulator Blower MotorsTroubleshooting Chart Continuously Wiring Diagram for GMS8/GDS8/GHS8 Are Subject to Change Without Notice
Related manuals
Manual 16 pages 38.83 Kb

GMS8, GHS8, GDS8 specifications

Goodman Manufacturing, a well-reputed name in the HVAC industry, offers a comprehensive range of heating and cooling solutions. Among their notable products are the GDS8, GHS8, and GMS8 series, each designed to meet diverse customer needs while providing exceptional performance and energy efficiency.

The Goodman GDS8 gas furnace is known for its remarkable efficiency and reliability. Boasting an AFUE (Annual Fuel Utilization Efficiency) rating of up to 80%, the GDS8 converts a significant portion of fuel into usable heat, ensuring lower energy bills for homeowners. This model features a multi-speed blower motor that optimizes airflow, enhancing temperature consistency throughout the home, and reducing noise levels during operation. The GDS8 comes equipped with a durable heat exchanger crafted from high-quality steel, ensuring longevity and optimal heat transfer.

On the other hand, the GHS8 series represents Goodman’s commitment to high-efficiency heating. With an AFUE rating of up to 96%, the GHS8 is engineered for maximum performance. Its two-stage heating system allows for better temperature control, enabling the furnace to operate quietly and efficiently. Another standout feature is the ComfortBridge technology, which enhances the system’s ability to communicate and adapt to the home’s specific heating needs. This feature optimizes energy usage and increases comfort levels in any environment.

The Goodman GMS8 model is an exceptional choice for homeowners looking for a reliable gas furnace with a focus on energy efficiency. Similar to its counterparts, the GMS8 also delivers an AFUE of up to 96.5%. This unit features an advanced modulating gas valve that adjusts heating output based on the temperature requirements, creating a consistent and comfortable indoor climate. The GMS8 is also equipped with a high-efficiency ECM blower motor, which reduces energy consumption while improving airflow.

All three models feature Goodman’s quality construction, including a heavy-gauge cabinet that minimizes noise and enhances durability. They also are backed by Goodman’s limited lifetime warranty on the heat exchanger and a 10-year limited warranty on parts, providing customers with peace of mind regarding their investment. These furnaces are designed with efficiency and comfort in mind, making the GDS8, GHS8, and GMS8 ideal choices for homeowners looking to enhance their indoor environment while keeping energy costs in check.
Top Page Image Contents