Bryant ERVBBSVA1100 Ventilation Evaluation, Control Board Operation, Care and Maintenance

ERV / HRV

VENTILATION EVALUATION

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in reduced unit efficiency, capacity or unit life.

DO NOT use HRV during construction of a house or when sanding drywall. This type of dust may damage system.

Ventilator Sizing

Tables 3 and 4 should be used to determine the required airflow for a home. These guidelines are taken from ASHRAE 62.2-2004.

Table 3 – Ventilation Air Requirements, cfm

FLOOR			BEDROOMS
AREA (ft2)
	0---1	2---3		4---5	6---7	>7
<1500	30	45		60	75	90
1501---3000	45	60		75	90	105
3001---4500	60	75		90	105	120
4501---6000	75	90		105	120	135
6001---7500	90	105		120	135	150
>7500	105	120		135	150	165

Table 4 – Ventilation Air Requirements, L/s

FLOOR			BEDROOMS
AREA (m2)
	0---1	2---3		4---5	6---7	>7
<139	14	21		28	35	42
139.1--- 279	21	28		35	42	50
279.1--- 418	28	35		42	50	57
418.1--- 557	35	42		50	57	64
557.1--- 697	42	50		57	64	71
>697	50	57		64	71	78

CONTROL BOARD OPERATION

Defrost

The ERV/HRV continually monitors the outside air temperature. If the outside air is at or below 23°F (-5°C), the ERV/HRV will initiate a defrost cycle by closing the outside air damper and recirculating warm indoor air through the heat recovery core. This happens every 32 minutes with a 6 minute defrost cycle. During this process, core is defrosted without the use of electric strip heat. At 5°F (-15°C), unit will defrost for 6 minutes every 32 minutes. At -17°F (-27°C), the unit will sense a need to defrost every 20 minutes with a 6 minute cycle. See the Troubleshooting section for a control logic explanation.

Off and Intermittent/Off Mode

When ERV/HRV is Off, K1 relay is open, and K5 relay is energized which closes outside air damper.

High-Speed Air Exchange

When high-speed air exchange occurs, K1 and K2 relays are energized and K5 relay is de-energized. This opens low-speed contacts, and closes high-speed contact on K2 relay. This also opens contact on K5 relay which opens outside air damper. Then, 115VAC is applied between orange and gray wires on Molex plug (pins 1 and 6) and blower motor runs in high-speed operation.

Low-Speed Air Exchange

When low-speed air exchange occurs, K1 Relay is energized which closes the contacts. K2 and K5 relays are de-energized. This keeps low-speed contacts closed and high-speed contacts open on K2 relay, and opens outdoor air damper. 120VAC is applied

between Red and Gray wires on Molex plug (pins 1 and 4) and blower motor runs in low-speed operation.

CARE AND MAINTENANCE

Door

ERV/HRV door can be removed by unlatching brief case style latches, then slide door to the right and remove it from hinges. Door must be in place and secured shut for proper operation.

Filter

Filters in ERV/HRV are washable and should be cleaned every 3 months. Use a vacuum cleaner to remove heaviest portion of accumulated dust, then wash in lukewarm water. Allow filter to completely dry before reinstalling. A dirty air filter will cause excessive strain on blower motor. Never operate unit without a filter. Vacuum out debris.

In addition, regularly check and clean screens on exterior intake and exhaust hoods when necessary.

!CAUTION

UNIT COMPONENT DAMAGE HAZARD

Failure to follow this caution may result in unit component damage.

DO NOT clean filters in a dishwasher and DO NOT dry them with a heating appliance or permanent damage will result.

Blower Motor and Wheel

ERV/HRV blower motors are factory lubricated for life. Lubricating bearings is not recommended. However, inspect and clean any accumulated dirt and grease from blower motor and wheel annually.

Cleaning the Core

ERV is equipped with a special energy recovery core which utilizes a special membrane and allows transfer of sensible and latent energy. The core should always be vacuumed only every 3 months to remove dust and dirt that could prevent transfer of energy. (See Fig. 15 and 16.)

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Fig. 15 - ERV Ports on Side (Bottom View)

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Fig. 16 - HRV Ports on Side (Bottom View)

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