5. TYPICAL INSTALLATIONS
(CONT’D)
5.5
R
ETURN
-
TO
-R
ETURN
I
NSTALLATION
(Connection to a Forced Air System)
5.5.1 C
RAWL
S
PACE
• 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.
I
NSTALLATION 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 6.11 (Low Temperature Applications) for instructions on drain line protection (GSHH3K only) and other cold
environment installation details.
VH004
3
GSVH1K, GSHH3K and GSEH3K
that use fresh outside air.
Drain required only for the GSHH3K.
- 13 -
5.5.2 A
TTIC
• 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 6.11 (Low Temperature Applications) for instructions on drain line protection (GSHH3K only) and other cold
environment installation details.
VH0051
Drain required only for the GSHH3K.
CAUTION
When the ambient temperature for the unit
location is below freezing (32°F - 0°C), the unit
must run continuously to prevent condensation.
CAUTION
When the ambient temperature for the unit
location is below freezing (32°F - 0°C), the unit
must run continuously to prevent condensation.
