Goodman Mfg VC8 instruction manual Measuring Inlet Gas Pressure Alt. Method

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START-UP PROCEDURE AND ADJUSTMENT

Gas Line

Gas

Shutoff

Valve

Gas Line

To Furnace

Open To

Atmosphere

Drip Leg Cap

With Fitting

Manometer Hose

Manometer

Measuring Inlet Gas Pressure (Alt. Method)

GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT

CAUTION

TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE. ONLY MINOR ADJUSTMENTS SHOULD BE MADE BY ADJUSTING THE GAS VALVE PRESSURE REGULATOR.

Only small variations in gas pressure should be made by ad- justing the gas valve pressure regulator. The manifold pressure must be measured with the burners operating. To measure and adjust the manifold pressure, use the following procedure.

1.Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace.

2.Turn off all electrical power to the system.

3.Outlet pressure tap connections:

a.Honeywell VR9205 valve: Remove the outlet pressure boss plug. Install an 1/8" NPT hose barb fitting into the outlet pressure tap.

b.White-Rodgers 36G54 valve: Back outlet pressure test screw (inlet/outlet pressure boss) out one turn (counterclockwise, not more than one turn).

4.Attach a hose and manometer to the outlet pressure barb fitting (Honeywell valve) or outlet pressure boss (White-Rodgers valve).

5.Turn ON the gas supply.

6.Turn on power and close thermostat “R” and “W1” contacts to provide a call for low stage heat.

7.Measure the gas manifold pressure with burners firing. Adjust manifold pressure using the Manifold Gas Pressure table shown below.

8.Remove regulator cover screw from the low (LO) outlet pressure regulator adjust tower and turn screw clockwise to increase pressure or counterclockwise to decrease pressure. Replace regulator cover screw.

9.Close thermostat “R” and “W2” contacts to provide a call for high stage heat.

10.Remove regulator cover screw from the high (HI) outlet pressure regulator adjust tower and turn screw clockwise to increase pressure or counterclockwise to decrease pressure. Replace regulator cover screw.

11.Turn off all electrical power and gas supply to the system.

12.Remove the manometer hose from the hose barb fitting or outlet pressure boss.

13.Replace outlet pressure tap:

a.Honeywell VR9205 valve: Remove the 1/8" NPT hose barb fitting from the outlet pressure tap. Replace the outlet pressure boss plug and seal with a high quality thread sealer.

b.White-Rodgers 36G54 valve: Turn outlet pressure test screw in to seal pressure port (clockwise, 7 in-lb minimum).

14.Turn on electrical power and gas supply to the system.

15.Close thermostat contacts “R” and “W1/W2” to energize the valve.

Using a leak detection solution or soap suds, check for leaks at outlet pressure boss plug (Honeywell valve) or screw (White- Rodgers valve). Bubbles forming indicate a leak. SHUT OFF GAS AND REPAIR ALL LEAKS IMMEDIATELY!

NOTE: For gas to gas conversion, consult your dealer for appropriate conversion.

 

Manifold Gas Pressure

 

 

Gas

Range

Nom inal

Natural

Low Stage

1.6 - 2.2"

w .c.

1.9" w .c.

 

High Stage

3.2 - 3.8"

w .c.

3.5" w .c.

Propane

Low Stage

5.7 - 6.3"

w .c.

6.0" w .c.

 

High Stage

9.7 - 10.3" w .c.

10.0" w .c.

GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY)

The gas input rate to the furnace must never be greater than that specified on the unit rating plate. To measure natural gas input using the gas meter, use the following procedure.

1.Turn OFF the gas supply to all other gas-burning appliances except the furnace.

2.While the furnace is operating, time and record one complete revolution of the smallest gas meter dial.

3.Calculate the number of seconds per cubic foot (sec/ft3) of gas being delivered to the furnace. If the dial is a one cubic foot dial, divide the number of seconds recorded in step 2 by one. If the dial is a two cubic foot dial, divide the number of seconds recorded in step 2 by two.

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Contents Installation Instructions for *D, MVC8 GAS Furnace Upright Installations Table of Contents What to do if YOU Smell GAS Safety PrecautionsKeep this literature in a safe place for future reference Product ApplicationProduct Description Location Requirements and ConsiderationsNational Fire Protection Association, Inc CSA InternationalClearances and Accessibility Combustion & Ventilation Category Following vent testing procedure is reproduced fromCategory I Venting Vertical Venting Exterior Masonry Chimneys Category I Furnaces onlyExteriormasonrychimneyscategoryifurnacesonly Proper Chimney Termination? Check Check 3 Chimney Crown Condition Electrical Connections High Voltage Important Note Single Stage Heating with Single Stage Cooling Thermostat Wiring DiagramsGAS Supply and Piping Accessories WiringGas Altitude Kit Orifice Manifold Pressure Circulating AIR and FiltersGeneral Furnace Layout Propane Gas Installation Typ Checking Static Pressure 80% Furnace Shown, 90% Similar START-UP Procedure and AdjustmentUpright Installations Honeywell Model VR9205 Connected to Manometer White-Rodgers Model 36G54 Two-StageWhite-Rodgers Model 36G54 Connected to Manometer Honeywell Model VR9205 Two-StageMeasuring Inlet Gas Pressure Alt. Method Example Temperature Rise MeasurementSwitch Bank S4 Heat Off Delay Dipswitches Switch Bank S4Comfortnet System Comfortnet SystemCTK01AA System Wiring using Four-WiresTo step to the next item Configuration Cool Airflow CL CFM Normal Sequence of Operation Operational Checks & Safety Circuit DescriptionOperational Checks Safety Circuit Description Troubleshooting & MaintenanceTroubleshooting Miscellaneous MaintenanceRepair and Replacement Parts Before Leaving AN InstallationInternal Troubleshooting ChartLimit Message ChartInvalid Trips Status Codes AIR Flow Data DIP SwitchesRD WH MVC8AA Wiring DiagramMVC8AB, *DVC8AA Wiring Diagram

VC8 specifications

Goodman Manufacturing has established itself as a leading provider of quality heating, ventilation, and air conditioning (HVAC) systems. Among its impressive lineup is the Goodman VC8, a versatile and efficient variable-capacity air conditioner that stands out due to its innovative design and advanced technologies.

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One of the standout features of the VC8 is its variable-speed compressor, which allows the system to adjust its output based on the cooling needs of the space. This technology enables the unit to run at lower speeds for longer periods, maintaining a consistent temperature while reducing energy usage. The variable-speed operation also contributes to quieter operation compared to traditional air conditioning systems. Homeowners can enjoy a peaceful indoor environment without the disruptive noise commonly associated with air conditioning units.

In terms of comfort, the Goodman VC8 employs advanced humidity control features, ensuring that moisture is efficiently managed within the space. This not only enhances comfort levels but also helps to prevent issues related to excessive humidity, such as mold growth and structural damage.

The VC8 is designed for reliable performance and durability, with its robust construction and dependable components. Goodman manufactures its products with high-quality materials to withstand the rigors of daily use and various weather conditions, ensuring long-lasting operation.

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The Goodman VC8 is an exemplary solution for those looking for an energy-efficient, advanced air conditioning system. With its variable-speed compressor, excellent humidity control, durable construction, and smart features, it promises comfort and reliability suitable for any residential space. By choosing Goodman, homeowners can invest in a quality HVAC system designed to meet modern needs and preferences.
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