Troubleshooting - Carrier HRVCCLHA Installation Instructions Manual

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
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

WARNING
!
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.
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 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: 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, 3, or 4 to determine if wall control is operating correctly. Use
Fig. 13to check control wire connections.
NOTE: The electronic control board and wall control operate on
12vdc.
Control Board
Electronic control board must have wall control attached before
unit will function properly (except for units equipped with manual
switch such as the new horizontal units). Also, configuration
jumpers located on control board must match configuration setup
shown on Fig. 20 under Jumper Table. In addition, outside air
thermistor must be connected to control board for it to operate
properly. See Table 7, 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 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 3 pin jumpers.
13