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Installer Selectable High Speed Settings
The circuit board on this unit has adjustable DIP switches
to select the maximum air flow at high speed. Adjusting
high speed can be useful to accurately satisfy the calcu-
lated ventilation rate. The chart below indicates how to ad-
just high speed to High Speed 4 and High Speed 3. Refer to
the specification pages in the manual for the air flow rates
for Speeds 5, 4 and 3. The factory setting is High Speed 5.
NOTE − Low speed is not adjustable.
Description
Switch
Position 1
Switch
Position 2
Switch
Position 3
Switch
Position 4
High Speed 5
factory setting
Factory
setting ON
Leave on
factory set-
ting
ON
ON
High Speed 4
OFF
ON
High Speed 3
ON
OFF
The orientation of the circuit board in the electrical
box may differ from this illustration
DIP switches 3 and
4 in ON position
(factory setting)
Functionality of DIP switches 1 and 2
DIP 1 ON
R2000 defrost cycle disabled
(factory setting)
DIP 1 OFF
R2000 defrost cycle enabled
DIP 2 ON
Recirculating Defrost models
DIP 2 OFF
Damper defrost and fan de-
frost models
Figure 28. Speed Settings
Airflow Balancing Using Pitot Tube
It is necessary to have balanced airflow in HRV/ERV units.
The volume of air brought in from the outside must equal
the volume of air exhausted by the unit if the airflow is not
properly balanced, then:
1. The HRV/ERV unit may not operate at its maximum
efficiency.
2. A negative or positive air pressure may occur in the
house.
3. The (HRV) unit may not defrost properly.
4. Failure to balance HRV/ERV units properly may void
warranty.
DANGER
Risk of Carbon Monoxide Poisoning and/or Explo-
sion.
Can cause injury or death.
Combustion and flue gases from heating ap-
pliances must never be allowed to enter living
spaces.
HRV/ERV unit must be properly balanced (see page
28 or 31) to prevent negative pressure in structure.
Negative pressure can cause back−drafting of com-
bustion gases in other household appliances such
as Gas Furnaces, Oil Furnaces, Hot Water Heaters,
Wood Stoves, Fireplaces, etc.
(5-Port HRV models only) Defrost cycles will cause
negative pressure in equipment room. Install duct-
work and route to areas that do not contain ap-
pliances with vented combusted gases.
Never connect a return or supply duct to other heat-
ing units such as fireplaces, wood stoves.
CAUTION
Potential Condensation Damage.
Condensation can cause damage to building struc-
tures.
Ensure proper HRV/ERV balancing. Excessive posi-
tive pressure in a home can force warm/moist in-
door air through wall insulation towards external
walls. In cold weather, this may cause unseen con-
densation to collect on the interior surfaces of exter-
nal walls.
