Tjernlund HST_HS115_HSUL-J, 1, 2 Series (Discontinued) 8504060 Rev A 11/99 - Manual (Page 6)

POWER VENTER INSTALLATION
VERIFY POWER VENTER MODEL SELECTION USING TABLES ON PAGE 1.
CODE REQUIREMENTS
The Power Venter installation must be done in accordance with the following requirements of the latest Edition of the National Fuel
Gas Code (NFPA #54):
• All portions of the vent system under positive pressure during operation (on the outlet side of Power Venter) shall be designed and
installed so as to prevent leakage of flue or vent gases into the building.
• All appliances must enter the vent system on the inlet side of the Power Venter.
• Provision shall be made to interlock the appliance(s) to prevent the flow of gas to the main burners when the draft system is not
performing so as to satisfy the operating requirements of the equipment for safe performance. See “Electrical Wiring” section of
this manual for details.
INSTALLATION RESTRICTIONS
1. Power Venter must be installed as close as possible to the termination of the vent system to obtain
optimal appliance efficiency and to prevent flue gas leakage, (See Diagram A).
2. The Power Venter may be mounted in any position as long as the shaft of the motor remains
horizontal, to prevent motor bearing wear and to ensure proper Fan Proving Switch operation,
(See Diagram B).
3. The Power Venter housing is single wall. A 6” clearance to
combustibles must be maintained for gas and 18” clearance for oil
applications, (See Diagram C). If the appliance nameplate specifies a
vent connector clearance greater than 6 inches, the greater clearance
must be used. Refer to NFPA # 31 for Oil Burning Equipment.
NOTE: Clearance to combustibles may be reduced. Please refer to
Clearance Table VI in NFPA #54 and your local code authority.
4. Vent pipe transitions, where necessary, must be gradually tapered,
(See Diagram D).
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DIAGRAM A
DIAGRAM D
DIAGRAM C
DIAGRAM B