TROUBLESHOOTING & MAINTENANCE

OPERATIONAL CHECKS

The burner flames should be inspected with the burner compart- ment 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.

Burner Flame

SAFETY CIRCUIT DESCRIPTION

A number of safety circuits are employed to ensure safe and proper furnace operation. These circuits serve to control any potential safety hazards and serve as inputs in the monitoring and diagno- sis of abnormal function. These circuits are continuously moni- tored during furnace operation by the integrated control module.

INTEGRATEDCONTROLMODULE

The integrated control module is an electronic device which, if a potential safety concern is detected, will take the necessary pre- cautions and provide diagnostic information through an LED.

PRIMARY LIMIT

The primary limit control is located on the partition panel and moni- tors heat exchanger compartment temperatures. It is a normally- closed (electrically), automatic reset, temperature-activated sen- sor. The limit guards against overheating as a result of insufficient conditioned air passing over the heat exchanger.

AUXILIARYLIMIT

The auxiliary limit controls are located on or near the circulator blower and monitors blower compartment temperatures. They are a normally-closed (electrically), manual-reset sensors. These lim- its guard against overheating as a result of insufficient conditioned air passing over the heat exchanger.

ROLLOUT LIMIT

The rollout limit controls are mounted on the burner/manifold as- sembly and monitor the burner flame. They are normally-closed (electrically), manual-reset sensors. These limits guard against burner flames not being properly drawn into the heat exchanger.

PRESSURESWITCHES

The pressure switches are normally-open (closed during opera- tion) negative air pressure-activated switches. They monitor the airflow (combustion air and flue products) through the heat ex- changer via pressure taps located on the induced draft blower and

the coil front cover. These switches guard against insufficient air- flow (combustion air and flue products) through the heat exchanger and/or blocked condensate drain conditions.

FLAMESENSOR

The flame sensor is a probe mounted to the burner/manifold as- sembly which uses the principle of flame rectification to determine the presence or absence of flame.

TROUBLESHOOTING

ELECTROSTATICDISCHARGE(ESD)PRECAUTIONS

NOTE: Discharge body’s static electricity before touching unit. An electrostatic discharge can adversely affect electrical components.

Use the following precautions during furnace installation and ser- vicing to protect the integrated control module from damage. By putting the furnace, the control, and the person at the same elec- trostatic potential, these steps will help avoid exposing the inte- grated control module to electrostatic discharge. This procedure is applicable to both installed and uninstalled (ungrounded) fur- naces.

1.Disconnect all power to the furnace. Do not touch the integrated control module or any wire connected to the control prior to discharging your body’s electrostatic charge to ground.

2.Firmly touch a clean, unpainted, metal surface of the furnace away from the control. Any tools held in a person’s hand during grounding will be discharged.

3.Service integrated control module or connecting wiring following the discharge process in step 2. Use caution not to recharge your body with static electricity; (i.e., do not move or shuffle your feet, do not touch ungrounded objects, etc.). If you come in contact with an ungrounded object, repeat step 2 before touching control or wires.

4.Discharge your body to ground before removing a new control from its container. Follow steps 1 through 3 if installing the control on a furnace. Return any old or new controls to their containers before touching any ungrounded object.

DIAGNOSTICCHART

WARNING

HIGH VOLTAGE !

TO AVOID PERSONAL INJURY OR DEATH DUE TO

ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER

BEFORE PERFORMING ANY SERVICE OR MAINTENANCE.

Refer to the Troubleshooting Chart in theAppendix for assistance in determining the source of unit operational problems. The dual 7- segment LED display will display an error code that may contain a letter and number. The error code may be used to assist in trouble- shooting the unit.

49

Page 48 Page 50
Page 49
Image 49
Goodman Mfg CVC9/95, MVC95 Troubleshooting & Maintenance Operational Checks, Safety Circuit Description
Page 48 Page 50

MVC95, CVC9/95 specifications

Goodman Manufacturing has established itself as a leader in the HVAC industry, and among its stellar lineup, the Goodman CVC9/95 and MVC95 stand out for their remarkable features, technologies, and efficiency.

The Goodman CVC9/95 is a high-performance gas furnace, designed for homeowners seeking reliability and cost-effective heating solutions. It operates with an impressive 95% Annual Fuel Utilization Efficiency (AFUE), which means that a significant portion of the fuel it consumes is converted into heat. This level of efficiency not only contributes to lower energy bills but also reduces greenhouse gas emissions, making it an environmentally friendly choice.

One of the standout features of the CVC9/95 is its multi-speed ECM blower motor. This technology adjusts the airflow according to the heating demands of the home, ensuring consistent and comfortable temperatures. The ECM motor also operates quietly, enhancing the comfort of your living space without the disruptive noise often associated with traditional furnaces.

The MVC95, on the other hand, offers similar efficiency with its also 95% AFUE rating. This model is equipped with a patented ignition system that enhances reliability with minimal maintenance needs. Its durable construction includes a heavy-gauge steel cabinet and an insulated blower compartment that minimizes heat loss. This design not only supports optimal performance but also contributes to its longevity.

Both models come with a self-diagnostic control board that provides straightforward troubleshooting capabilities, making it easier for technicians to ensure that your system is operating at peak performance. This feature aids in timely maintenance, which is crucial for extending the lifespan of the unit.

Additionally, Goodman backs their products with a strong warranty, offering a lifetime limited warranty on the heat exchanger and a 10-year limited parts warranty. This assurance provides homeowners peace of mind regarding their investment.

In the landscape of HVAC solutions, the Goodman CVC9/95 and MVC95 models exemplify a commitment to quality, efficiency, and advanced technology. Whether for new constructions or replacements, these furnaces offer superior heating performance coupled with modern conveniences, making them an invaluable choice for homeowners seeking effective climate control solutions. With their low emissions and high efficiency, choosing Goodman means investing in both comfort and sustainability.
Top Page Image Contents