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11
For the Installer
5.3.4 SIMPLIFIED INSTALLATION - RETURN/SUPPLY
CAUTION
When performing duct connections to the furnace supply duct, use metal ducts appropriately sized to support
the additional airflow produced by the unit.
Stale air from building ductwork:
• Cut an opening into the furnace return duct at least 10 feet (3.1 m) (A + B) away from the furnace.
• Connect this opening to the stale air from building port of the unit (as illustrated).
Fresh air to building ductwork:
• Cut an opening into the furnace supply duct at least 18 inches (0.5 m) away from the furnace.
• Connect this opening to the fresh air to building port of the unit (use metal ducts, see illustration at right).
• Make sure that the unit duct forms an elbow inside the furnace ductwork.
NOTE: For this type of installation, it is recommended, however, not essential, that the furnace blower be synchronized with the unit.
5.3.5 SIMPLIFIED INSTALLATION - RETURN/RETURN
For the following units only:
S10 ERVplus 70E+
Fresh air to building ductwork:
• Cut an opening into the furnace return duct at least 10 feet (3 m) away from the furnace.
• Connect this opening to the fresh air to building port of the HRV/ERV (use metal ducts, see illustration at right).
Stale air from building ductwork:
• Cut an opening into the furnace return at least 3 feet (1 m) ahead of the fresh air to building ductwork connection to the furnace return.
• Connect this opening to the stale air from building port of the HRV/ERV.
• Make sure that both connections to the furnace return duct are at least 3 feet (1m) apart.
CAUTION
For this type of installation, the furnace must always be synchronized with the unit. See section 7.
VH0148
B
A
18” (0.5 M)
MINIMUM
A + B = AT LEAST
10’ (3.1 M)
VH0149
B
A
18” (0.5 M)
MINIMUM
VH0150
B
A
A + B = AT LEAST
10’ (3.1 M)
AT LEAST
3’ (1 M)
VH0150
B
A
AT LEAST
3’ (1 M)
Reverse units
Normal units
Reverse units
Normal units
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