User's
Intbrmation
Manual
for the Operation
and
Maintenance
of Heat Recovery
Ventilators
OFF LO,_ XlGH
P.RRET
BAS_
HAUIE
% O HU_,_IIDIIE RE_I1V£
HUMIOW¢
% HUM RE_I1VI:
HLIM
EX_ Ti_
EXT
©
©
AIA EXCHANG£
ON
ECHANGE O AIR
MARCHE
OFF
LOW
_NTERMITrENT
% D'HUMIDmE
RELATIVE H UMIOI'P¢
Basic Control
Standard
Control
Automatic
Control
Fig. 1 -- Controls
AO0030
OPERATING
YOUR HEAT RECOVERY
VENTILATOR
(HRV)
Your HRV is designed
to operate
as an integral
part of your total heating
and cooling
system. With the exception
of high capacity
models,
which are available
with standard
controls
only, all HRVs offer 3 control options
(See Fig. 1 .):
• Basic Controls:
Allow the user to manually
set the unit to low- or high-fan
speed as required
to maximize
comfort.
Controls
may
be unit mounted.
• Standard
Controls: Offer automatic
dehumidistat
control and the option to select low speed or intermittent
fan during heating season.
• Automatic
Controls:
In addition
to the operational
features
found with standard
controls,
automatic
controls
feature
a recircula-
tion mode. Not for use with forced-air
HVAC systems.
Fan Speed Control--Enables
user to modulate
fan speed from low to high.
Dehumidistat
Control--Allows
the user to select the relative
humidity
level at which the unit would change fan speed to avoid
condensation
problems
while heating
during the winter months.
TABLE 1 -- HUMIDITY
SETTINGS
*C
10
0
-10
-20
-30
OUTSIDE TEMPERATURE
*F
50
32
14
-4
-22
DOUBLE-PANE
WINDOWS
(PERCENTAGE)
55
45
35
30
25
TRIPLE-PANE WINDOWS
(PERCENTAGE)
65
55
45
40
35
Continuous
Mode--If
the relative
humidity
inside the building
is lower than selected,
air exchange
would occur with the outside
at low speed. If the relative
humidity
level inside the building
is higher
than selected,
air exchange
would occur outside
at high
speed. This ensures continuous
air exchange
for constant
air quality.
Intermittent
Mode--If
the relative humidity
inside the building
is lower than selected,
no air exchange
would occur, and the sys-
tem would turn off. If the relative
humidity
inside the building
is higher
than selected,
air exchange
would occur with outside
at
high speed. This ensures
minimum
air exchange
level when the building
is unoccupied
to minimize
operating
cost.
Reeirculation
Mode---If
the relative humidity
inside the building is lower than selected,
indoor air would be circulated
and filtered
at high speed. If the relative humidity
inside the house is higher than selected,
air exchange
would occur with outside
at high speed.
This ensures
continuous
movement
and filtration
of air for maximum
comfort.
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