14
CARE AND MAINTENANCE
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off, tag and
lockout main power to system. There may be more than 1
disconnect switch.
!
WARNING
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.
CAUTION
!
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.
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.
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.
CAUTION
!
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.
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.
TROUBLESHOOTING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off, tag and
lockout main power to system. There may be more than 1
disconnect switch.
!
WARNING
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.
CAUTION
!
NOTE
: Reference Table 7 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:
wall control, electronic control board and blower motor
.
Wall Control
Typically, the wall control is either good or it is bad. Use Table 1,
2, or 4 to determine if wall control is operating correctly. Use Fig.
28 to check control wire connections.
NOTE
: The electronic control board and wall control operate on
12vdc.
Control Board
In addition, outside air thermistor must be connected to control
board for it to operate properly. See Table 9, Temperature/Ohm
Relationship, for valid temperature range.
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
integrated control and initiate a low- speed blower (amber LED)
and high- speed blower operation (green LED).
NOTE
: If there is a short circuit or an open circuit at thermistor,
CPU will go into a 10 minute defrost cycle every 20 minutes.
