Care And Maintenance; Door; Filter; Blower Motor And Wheel - Bryant HRVBBLHU Installation, Start-Up, And Operating Instructions Manual

CARE AND MAINTENANCE

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.
I. 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.
II. 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 DAMAGE HAZ-
ARD
Failure to follow this caution may result in unit compo-
nent damage.
DO NOT clean filters in a dishwasher and DO NOT dry
them with a heating appliance or permanent damage will
result.
III. 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.
IV. 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 hr in a solution of warm
water and mild soap. Rinse under heavy stream of water. Hot water
and strong detergent will damage core and should NOT be used.

TROUBLESHOOTING

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.
NOTE: Reference Table 5 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

I. WALL CONTROL
Typically the wall control is either good, or it is bad. Use Table 1,
2, or 3 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.
II. CONTROL BOARD
Electronic control board must have wall control attached before
unit will function properly. Also, configuration jumpers located on
control board must match configuration setup shown on Fig. 28
under Jumper Table. In addition, outside air thermistor must be
connected to control board for it to operate properly. See Table 6,
Temperature -vs- Ohm Chart, for valid temperature range.
III. BLOWER MOTOR
The HRV blower motor operates on 115vac, with 2-speed opera-
tion.
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.
OVERRIDE TEST
To use override test function, a thermistor must be connected to the
control board. Unit must not be in defrost mode during an override
test.
A. High Speed
1. Disconnect HRV from 115vac.
2. Unplug wall control wires at control module terminal block
inside HRV.
3. Plug HRV back to 115vac.
4. Attach a wire across J3-8 and J3-9 (B and G) on control
module terminal block.
5. Push in door switch, this will initiate a high-speed ex-
change.
B. Low Speed
1. Unplug HRV from 115vac.
2. Disconnect wall control wires at control module terminal
block inside HRV.
3. Plug HRV back to 115vac.
4. Connect a 3.9 K ohm resistor between J3-8 and J3-9 (B and
G) on control module terminal block.
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