Technical data

5. TYPICAL INSTALLATIONS (CONT’D)
5.5 RETURN-TO-RETURN INSTALLATION
(Connection to a Forced Air System)
5.5.1 CRAWL SPACE
• Simplify the installation by using
the existing ductwork.
• Non-visible ducts.
• The HEPA Filtration model GSFH1K
has no connection to outside, so all
parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• Installing the unit near an exterior wall
will shorten the length of the insulated
ducts (not necessary for HEPA Filtration
model GSFH1K).
• If a HEPA Filtration Fresh Air & Heat Recovery Ventilation model GSHH3K is installed, a water drain must be close to collect
the run-off.
• To avoid the cross-contamination and achieve highest efficiencies, the furnace / air handler blower must always be ON (or
the efficiency will be affected).
• The HEPA Filtration Fresh Air Ventilation model GSVH1K needs to be ON all the time, since it doesn’t have motorized
dampers. If this unit is OFF, then the furnace / air handler will draw cold outdoor air inside.
• All ducts must be insulated.
• For the HEPA Filtration, Fresh Air & Heat Recovery Ventilation (GSHH3K) and the HEPA Filtration, Fresh Air & Energy
Recovery Ventilation (GSEH3K) models only, if the ambient temperature around the unit drops below freezing (32°F - 0°C),
go to Section 6.12 (Low Temperature Applications) for instructions on drain line protection (GSHH3K only) and other cold
environment installation details.
VH0043
GSVH1K, GSHH3K and GSEH3K
that use fresh outside air.
CAUTION
When the ambient temperature for the unit
location is below freezing (32°F - 0°C), the
unit must run continuously to prevent
condensation.
Drain required only for the GSHH3K.
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5.5.2 ATTIC
• Simplify the installation by using
the existing ductwork.
• Non-visible ducts.
• The HEPA Filtration model GSFH1K
has no connection to outside, so all
parts encircled are not required.
INSTALLATION CONSIDERATIONS:
• If a HEPA Filtration Fresh Air & Heat
Recovery Ventilation model GSHH3K
is installed, a water drain must be
close to collect the run-off.
• All ducts must be insulated.
• For the HEPA Filtration, Fresh Air & Heat Recovery Ventilation (GSHH3K) and the HEPA Filtration, Fresh Air & Energy
Recovery Ventilation (GSEH3K) models only, if the ambient temperature around the unit drops below freezing (32°F - 0°C),
go to Section 6.12 (Low Temperature Applications) for instructions on drain line protection (GSHH3K only) and other cold
environment installation details.
VH0050
CAUTION
When the ambient temperature for the unit
location is below freezing (32°F - 0°C), the
unit must run continuously to prevent
condensation.
Optional Breidert caps (such as
Air-X-Hauster relief ventilator) can be
used to pick up fresh outside air and
evacuate stale air. See Section 6.9
for more installation details.
Drain required only for the GSHH3K.