9
CONTROL BOARD OPERATION
1. Defrost
The ERV/HRV continually monitors the outside air temperature. If
theoutsideairis ator below 23°F(--5°C), the ERV/HRV will initiate
a defrost cycle by closing the outside air damper and recirculating
warm indoor airthrough the heat recovery core.This happensevery
32 min. with 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 min. 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.
2. Off and Intermittent/Off Mode
When ERV/HRV is Off, K1 relay is open, and K5 relay is ener gized
which closes outside air damper.
3. 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
isapplied between orange and gray wireson Molex plug (pins 1 and
6) and blower motor runs in high--speed operation.
4. 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. 120vacisapplied between Red
and Gray wires on Molex plug (pins1 and 4) and blower motor runs
in low--speed operation.
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.
!
WARNING
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
careand wearappropriateprotectiveclothing and gloves
when handling parts.
CAUTION
!
CARE AND MAINTENANCE
1. 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.
2. 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
excessivestrain on blowermotor. Neveroperate unitwithout afilter.
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
!
3. Blower Motor and Wheel
ERV/HRV blowermotors arefactory lubricated for life.Lubricating
bearings is not recommended. However , inspect and clean any
accumulated dirt and grease from blower motor and wheel annually.
4. 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. 16 and 17).
NOTE: The core should only be serviced when outdoor
temperature is between 60°F and 75°F and it is dry.
FRESH AIR
TO BUILDING
STALE AIR
FROM BUILDING
STALE AIR
TO OUTSIDE
FRESH AIR
FROM OUTSIDE
A05346
Fig. 14 -- ERV/HRV Airflow During Air Exchange
ERV/HRV
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