Care And Maintenance; Troubleshooting - Bryant HRVBBLHA Installation Instructions Manual

Step 5.—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.
WARNING: ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off
main power to system. There may be more than 1
disconnect switch.
CAUTION: CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs.
Use care and wear appropriate protective clothing
and gloves when handling parts.

CARE AND MAINTENANCE

Step 1.—Door
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.
Step 2.—Filter
Filters in 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
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.
Step 3.—Blower Motor and Wheel
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.
Step 4.—Cleaning the Core
HRV unit is equipped with special heat recovery core and
must be handled with care. We recommend that it be
washed once a year following the season of most intense
use. This will ensure maximum efficiency of the plastic
partitions within the core.
Allow heat recovery core to soak for 3 hours in a solution of
warm water and mild soap. Rinse under stream of water.
Hot water and strong detergent will damage core and
should NOT be used.
Note: Reference Table 6 Troubleshooting Chart
This can be a quick guide in resolving unit problems. It is
also recommended to review and understand Wall Control
Board Operation and Care and Maintenance sections
before continuing. There are 3 main parts to focus on when
troubleshooting HRV unit:
1. Wall Control
2. Electronic control board
3. Blower motor
1. Wall Control
Typically, the wall control is either good or it is bad. Use
Table 1, 2, 3, or 4 to determine if wall control is operating
correctly. Use Fig. 12 to check control wire connections.
Note: The electronic control board and wall control operate
on 12vdc.
2. Control Board
Electronic control board must have wall control attached
before unit will function properly (except for units equipped
DAMAGE
with manual switch such as the new horizontal units). Also,
configuration jumpers located on control board must match
configuration setup shown on Fig. 27 under Jumper Table.
In addition, outside air thermistor must be connected to
control board for it to operate properly. See Table 7,
Temperature ---vs--- Ohm Chart, for valid temperature
range.
3. Blower Motor
The HRV blower motor operates on 115vac, with 2 ---speed
operation.
The easiest way to check blower speed operation is to use
the wall control and initiate a low ---speed blower and
high ---speed blower operation.
Note: If there is a short circuit or an open circuit at
thermistor, CPU will go into a 5 minute defrost cycle every
20 minutes. This feature is not there on older board
versions with 3pin jumpers.
14
WARNING: ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off
main power to system. There may be more than 1
disconnect switch.
CAUTION: CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs.
Use care and wear appropriate protective clothing
and gloves when handling parts.

TROUBLESHOOTING