6
2. T
ECHNICAL
D
ATA
2.1 A
IR
D
ISTRIBUTION
The figure below shows the air flows inside the units.
E
XHAUST
AIR
TO
OUTSIDE
F
RESH
AIR
FROM
OUTSIDE
F
RESH
AIR
TO
BUILDING
E
XHAUST
AIR
FROM
BUILDING
VF0047
2.2 H
EAT
R
ECOVERY
This unit is equipped with a
heat recovery core
, specifically designed to reduce ventilation
costs by recovering the heat energy from the exhaust air, and using that same heat energy to
warm the fresh air being supplied. This heat recovery process is accomplished in such a way
that the stale air is never mixed with the fresh air.
Example (in winter):
VF0015
E
XHAUST
AIR
FROM
BUILDING
60°C/140°F
(
DURING
HEATING
MODE
)
F
RESH
AIR
TO
BUILDING
35°C/95°F
F
RESH
AIR
FROM
OUTSIDE
0°C/32°F
E
XHAUST
AIR
TO
OUTSIDE
25°C/77°F
2.3 D
URING
C
OLD
W
EATHER
When the outside temperature is below the freezing point, heat recovery creates frost in the
module. If the furnace blower is set to operate intermittently, the heat coming from the stale
air will prevent unit frosting.
CAUTION
When the outside temperature is under -7°C (19°F), the furnace must operate
intermittently in heating mode to prevent frost accumulation inside the unit.
