Bryant ERVBBSVA1100 - User Manual

The ERV/HRV (Energy/Heat Recovery Ventilator) is a device designed to exchange indoor stale air with outside fresh air, while transferring both sensible and/or latent heat between the incoming fresh air and outgoing stale air. This cross-flow design core allows for heat and/or latent energy transfer without mixing the air streams. The unit operates at two airflows: 50 CFM (cubic feet per minute) in low speed and 100 CFM in high speed. It is available in both vertical and horizontal configurations.

Function Description:

The primary function of the ERV/HRV is to provide balanced ventilation, ensuring a continuous supply of fresh outdoor air while exhausting an equal amount of stale indoor air. This process helps maintain indoor air quality and comfort. The energy recovery core is a key component, transferring heat and/or latent energy between the two air streams. In heating mode, it recovers heat from the exhaust air to pre-warm the incoming fresh air. In cooling mode, it pre-cools and dehumidifies the incoming fresh air using the cooler, drier exhaust air. The unit also includes mechanical filters to trap dust and an electronic control circuit for proper operation.

Important Technical Specifications:

Airflow: 50 CFM (low speed), 100 CFM (high speed).
Configurations: Vertical and Horizontal.
Power Supply: 115VAC, 60Hz.
Control Board/Accessories Power: 12VDC.
Ducting: Insulated flexible ducts are required for connections to the exterior wall to prevent condensation. When connecting to a forced-air system, 18 inches (457mm) of flexible duct at ERV/HRV ports is recommended to act as a silencer.
Defrost Cycle: The unit continually monitors outside air temperature. If the outside air is at or below 23°F (-5°C), it initiates a defrost cycle by closing the outside air damper and recirculating warm indoor air through the heat recovery core. This process occurs every 32 minutes with a 6-minute defrost cycle. At 5°F (-15°C), it defrosts for 6 minutes every 32 minutes. At -17°F (-27°C), it defrosts for 6 minutes every 20 minutes.
Balancing: Airflow balancing is crucial for proper operation. This is achieved using a magnehelic gauge and balancing dampers at the fresh air intake and stale air exhaust ducts. The unit is considered balanced if there is a difference of ±10 CFM (or ±5 l/s or 17 m³/h) between the two airflows.

Usage Features:

Mounting: The unit can be suspended from floor joists using chains and springs, or installed on a shelf with an isolation pad to dampen vibration. It must always be installed as level as possible.
Application: Can be used as an independent or stand-alone unit, or in conjunction with a forced-air system. For forced-air applications, the fresh-air supply and stale-air return connect directly to the return-air duct system. The furnace or fan coil blower must be interlocked and operate continuously whenever the ERV/HRV is energized.
Wall Controls: Four remote wall control options are available: Basic Control, OneTouch Control, Standard Control (includes dehumidistat), and Latent Control (includes humidistat for ERVs only). These controls allow selection of various operating modes (Off, Low, High, Intermittent).
Integrated Control: All units have an integrated control located under the unit, in front of the electrical compartment. A push button on this control allows direct unit operation, overriding wall control functions. An LED indicates the current mode (Off, Intermittent, Low, High) and blinks to signal problems.
Timers: Optional push-button timers (20-minute) can override the wall control for high-speed operation in specific areas like bathrooms or kitchens. A 60-minute adjustable timer is also available for high-speed ventilation for a select amount of time.
Evolution Control System: The ERV/HRV can be controlled by the Evolution system control, which simultaneously manages the ERV/HRV and the indoor blower. It offers AUTO, LOW, and HIGH settings in both heating and cooling modes, and a DEHUM setting in heating mode.
Boot Sequence: After power loss or being unplugged, the unit performs a 30-second boot sequence, during which the integrated control LED lights GREEN or AMBER for 5 seconds, then shuts off for 2 seconds, and then lights RED while checking and resetting the motorized damper position.

Maintenance Features:

Filters: Washable filters should be cleaned every 3 months. Use a vacuum cleaner to remove heavy dust, then wash in lukewarm water and allow to dry completely before reinstalling. Do not clean filters in a dishwasher or dry them with a heating appliance.
Exterior Hoods: Regularly check and clean screens on exterior intake and exhaust hoods.
Blower Motor and Wheel: Blower motors are factory lubricated for life, so lubrication is not recommended. However, inspect and clean any accumulated dirt and grease annually.
Energy Recovery Core: The special energy recovery core should be vacuumed every 3 months to remove dust and dirt. The core should only be serviced when the outdoor temperature is 60°F to 75°F (16°C to 24°C) and it is dry. Do not use water to clean the core.
Door Removal: The ERV/HRV door can be removed by unlatching brief case style latches, then sliding it to the right and removing it from hinges. The door must be in place and secured shut for proper operation.
Troubleshooting: The manual provides a detailed troubleshooting guide based on integrated control LED flashes (GREEN for thermistor error, RED for open door/unplugged unit/exhaust motor error, AMBER for damper error) and common issues like unit not working, damper actuator failure, wall control issues, dehumidistat/timer problems, motor failures, and defrost cycle malfunctions. It also includes an override test function for high and low-speed operation.