11
CONTINUOUS/VENTILATION MODE — In this mode of
operation, both fans are operating and exchanging air with the
outside. The heat recovery ventilator constantly exchanges the
air at the selected rate, either at low or medium speed, and
switches to high speed when activated by an accessory remote
control. The low and medium fan speed selection will cause the
unit to operate in continuous exchange mode at an exchange
rate of 35% and 50% maximum airflow rating respectively.
Continuous mode is recommended, since pollutants are slowly
but constantly being generated in the house. See Fig. 28.
INTERMITTENT/STANDBY MODE — The system is al-
ways on standby and operates at high speed when activated by
an accessory remote control. Standby should be selected if the
user wishes to stop the unit from continuous exchange. It is rec-
ommended that the Standby mode only be used if the system is
equipped with an accessory external control, in which case, the
unit would activate to High fan speed, until the control is satis-
fied and then return to standby (off). See Fig. 29.
DEFROST (FAN SHUTDOWN) — The automatic defrost
cycle consists of a fan shutdown. When the supply airstream
temperature goes below 23 F, the supply motor shuts down and
the exhaust motor goes in to high speed. Ambient air is passed
through the unit for a period of 5 minutes. The supply motor
will then restart and run at the preset speed. The exhaust motor
will also slow down to the preset speed, and the unit will oper-
ate in the run cycle for 25 minutes. This fan shutdown defrost
cycle continues until the supply airstream rises above 32 F. See
Fig. 30.
MAINTENANCE
A yearly inspection is recommended to ensure the efficien-
cy and trouble-free use of the HRV. Verify the different operat-
ing modes.
Motor —
The motors are factory balanced and lubricated for
life. They require no maintenance.
Chassis —
The inside of the unit should be vacuumed
yearly. Be careful not to damage any of the mechanical compo-
nents and electrical connections.
Condensation Panel —
The condensation panel should
be cleaned yearly.
Drain and Drain Line —
Units with drain lines should
have their line and connection checked regularly.
Outside Hoods —
The outside hoods need to be checked
every season to make sure there are no debris, leaves, or insects
blocking the airflow. Check regularly that there are no pollut-
ants near the intake hood. Make sure the hoods are clear of any
snow accumulation during the winter months.
Filters —
The filters need to be checked and cleaned every
three months or when they appear dirty. This unit has two
filters.
To clean, remove the filters and vacuum. If the filters still
appear dirty, they can be washed in warm water and mild
detergent. Replace the filters if they become too soft after
washing. The filters should be replaced yearly or when they
can no longer be cleaned properly. The metal electrostatic filter
may need to be changed after washing a few times.
Heat Recovery Core —
Clean
the
heat
recovery
polypropylene core annually or as needed with a vacuum
cleaner. Use a soft brush attachment. If the core still appears
dirty, it can be washed with warm water and mild detergent.
Make sure the filters on the unit are cleaned. Failure to clean or
use filters may damage the heat recovery core and void the
warranty.
NOTE: The use of the heat recovery core in adverse envi-
ronment conditions such as dust, oil mist, excessive kitchen
grease, corrosive fumes, organic solvents, paint or any other
harmful chemicals can damage the heat recovery core and
void the warranty.
Make sure HRV is unplugged before performing any main-
tenance. Injury from electric shock could result.
AIR FROM
HOUSE
AIR FROM
OUTSIDE
AIR TO
HOUSE
AIR TO
OUTSIDE
* NO EXCHANGE OF AIR
AIR FROM
HOUSE
AIR TO
OUTSIDE
Fig. 28 — Continuous Mode
Fig. 29 — Intermittent Mode
Fig. 30 — Defrost Mode
