Venting and Combustion Air Installation
Excessive Horizontal Vent Runs
If maintaining the 1/4 inch per foot pitch requirement creates clearance problems with structural obstacles, i.e. low ceilings, the installer may opt to installing the vent in a manner that pitches up to a high point from the unit and then pitches away from the high point to the vent termination.
A condensate tee should be installed as close as possible to the unit when venting in this manner.
The vent run from the high point to the vent termination should be as minimal in length as possible to reduce the amount of potential con- densate that may form in the vent system.
The vent system must maintain the 1/4 inch per foot pitch to the high point and from the high point to the vent termination.
WARNING
Failure to provide a vent condensate tee close to the appliance could allow acidic flue gas condensate to enter into the appliance flue ways causing premature failure of the appliance.
Condensate Drain Tube
To prevent flue gases from entering into the building it is important the drain tube is fash- ioned into a “pigtail” trap as shown in Figs. 19 through 22B pages 33 and 34.
The drain tube must be filled with water to pre- vent flue gases from emitting into the building prior to operating the appliance.
NOTICE
Vent Appliance Adapters
-The PERFORMANCE requires the use of an appliance adapter as approved by the one of vent manufacturers listed on page 27.
WARNING
Failure to use an approved vent appli- ance adapter may create improper vent connection and potential flue gas leak- age. Do not mix the manufacturer appli- ance adapter with other manufacturers’ vent components, the vent system could fail or improperly seal, causing leakage of flue products into the building.
Vent Condensate Tee
A vent condensate tee and drain tube should be installed on a horizontal run of vent near the appliance to prevent any potential condensate from entering the flue ways on the unit. See Figs. 19 through 22B pages 33 and 34.
Periodically inspect the water level in the condensate drain tube. If low, add water as needed to maintain trap level.
If water in drain tube evaporates rapidly due to ambient conditions, propylene glycol may be added or substituted to reduce evaporation.
Pipe the condensate drain tube to a suitable place of drainage or to a condensate pump or sump. Consult local authorities regarding dis- posal of flue gas condensate into public waste water system.
Determining Piping Lengths
Once the venting method and location for the vent termination has been determined the installer must select the vent components required for the system.
The maximum combined equivalent lengths for venting and combustion air inlet are as follows:
-Delta PERFORMANCE PLUS - 200 feet (100 feet each)
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