OPERATIONAL CHECKS & SAFETY CIRCUIT DESCRIPTION

•Gas valve opens at end of igniter warm up period, delivering gas to burners and establishing flame.

•Integrated control module monitors flame presence. Gas valve will remain open only if flame is detected.

•If the thermostat call is for low heat, gas valve and induced draft blower will continue on low stage. If the call is for high heat, the gas valve and induced draft blower will change to high stage.

•Circulator blower is energized on heat speed following a thirty (30) second blower on delay. The circulator blower requires thirty seconds to ramp up to full speed. Electronic air cleaner terminal is energized with circulator blower.

•Furnace is now operating on the specified stage called for by the two-stage thermostat.

•Furnace runs, integrated control module monitors safety circuits continuously.

•If the two-stage thermostat changes the call from low heat to high heat, the integrated control module will immediately switch the induced draft blower, gas valve, and circulator blower to their high stage settings.

•If the two-stage thermostat changes the call from high heat to low heat, the control will immediately switch the induced draft blower and gas valve to their low stage settings. The circulator blower will remain on high heating speed for thirty (30) seconds before switching to the low heat circulating speed.

•R and W1 (or R and W1/W2) thermostat contacts open, completing the call for heat.

•Gas valve closes, extinguishing flame.

•Induced draft blower is de-energized following a fifteen second post purge. Humidifier terminals are de-energized.

•Circulator blower continues running for the selected heat off delay period (90, 120, 150 or 180 seconds). The speed run during this period depends on the last heat call provided by the thermostat.

If the last call for heat was a call for low heat, the air circulator motor will run on low heat speed for the duration of the heat off delay period (90, 120, 150 or 180 seconds). If the last call for heat was a call for high heat, the air circulating motor will run on the high heating speed for thirty (30) seconds and then switch to the low heating speed for the balance of the heat off delay period (60, 90, 120 or 150 seconds).

•Circulator blower and electronic air cleaner terminal is de-energized.

•Circulator blower ramps down to OFF during the 30 seconds following the heat off delay period.

•Furnace awaits next call from thermostat.

COOLING MODE

The normal operational sequence in cooling mode is as fol- lows:

•R and Y1/G or Y2/G thermostat contacts close, initiating a call for cool.

•Integrated control module performs safety circuit checks.

•Outdoor fan and compressor are energized to their appropriate speed.

•Circulator blower is energized on the appropriate cool speed at the level and time determined by the selected ramping profile. Electronic air cleaner terminal is energized with circulator blower.

•Furnace circulator blower and outdoor cooling unit run their appropriate speeds, integrated control module monitors safety circuits continuously.

•R and Y1/G or Y2/G thermostat contacts open, completing the call for cool.

•Outdoor fan and compressor are de-energized.

•Circulator blower continues running during a cool off delay period. The OFF delay time and airflow level are determined by the selected ramping profile.

•Electronic air cleaner terminal and circulator blower are de-energized.

•Furnace awaits next call from thermostat.

FAN ONLY MODE

The normal operational sequence in fan only mode is as fol- lows:

•R and G thermostat contacts close, initiating a call for fan.

•Integrated control module performs safety circuit checks.

•Circulator blower is energized on continuous fan speed (30% of the furnace’s maximum airflow capability) following a five (5) second delay. Electronic air cleaner terminal is energized.

•Circulator blower runs, integrated control module monitors safety circuits continuously.

•R and G thermostat contacts open, completing the call for fan.

•Circulator blower is de-energized. Electronic air cleaner terminal is de-energized.

•Furnace awaits next call from thermostat.

OPERATIONAL CHECKS

The burner flames should be inspected with the burner com- partment 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 burn- ers without curling, floating, or lifting off. Flames must not impinge on the sides of the heat exchanger firing tubes.

35

Page 34 Page 36
Page 35
Image 35
Goodman Mfg VC8 instruction manual Operational Checks
Page 34 Page 36

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.

The Goodman VC8 is known for its superior energy efficiency, featuring a SEER (Seasonal Energy Efficiency Ratio) rating higher than 20. This means that it operates efficiently across various climatic conditions, ensuring optimal cooling with minimal energy consumption. The high SEER rating not only translates to lower energy bills but also contributes to a reduced environmental footprint, making it a smart choice for eco-conscious consumers.

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.

Additionally, the VC8 incorporates smart technology features, including compatibility with Wi-Fi-enabled thermostats. Homeowners can easily monitor and control their system remotely, providing convenience and peace of mind.

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.
Top Page Image Contents