Eternal GU145 Series, Installation And Operation Manual

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Direct And Power Venting
GU145(S) / GU195(S,M) is factory configured as sealed combustion unit with dedicated intake and exhaust
connections.
When installed as a Direct Vent appliance, all combustion air is drawn directly from outside.
Direct Vent configuration is suitable for indoor only.
Recommended for facilities with difficulty accessing combustion air.
When installed outdoors, outdoor venting cap should be used.
Can be installed indoors, if combustion air supply is sufficient.
Not sealed combustion if intake is not used to bring air directly from outside.
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Direct Vent
Power Vent
To configure the unit for power vent, insert a 6" section of 3" pvc and terminate the intake with a 90 ° elbow. Be sure
to insert the included mesh screen into the intake hole before the PVC pipe. Do Not glue the PVC to the intake
collar for future serviceability.
● Reduce the maximum allowable length for each elbow used as follows:
- 45 degree elbow : Deduct 2 ½ feet
- 90 degree elbow : Deduct 5 feet
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How To Con  gure Unit For Power-Vent
Maximum Allowable Vent and Combustion Air Piping Length
Minimum Required Air Volume
2 inch Piping 3 inch Piping
Feet Max # of Elbows Feet Max # of Elbows
35 3 100 6
Insuf  cient air supply used with Power Vent appliance may cause the building to experience negative pressure
inside. Negative pressure is not allowable by most building codes and can cause back drafting of cold air from
outside through the unit potentially freezing the heat exchanger.
WARNING
! !
The intake vent length can be of equal length or less; there is no balancing requirement between intake and exhaust.
2" PVC Tube
2" PVC Tube
3"x2" Reducer
3" PVC Tube
2" Elbow
2" PVC Tube Conversion
Mesh Screen
6"
3" Elbow
3" PVC Tube
For installation in altitude over 4,000 feet, Do Not connect this venting system with 2 ” piping.
WARNING
! !