Delta PG PLUS-25 - Manual (Page 38)

32
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.
Vent Appliance Adapters
- The PERFORMANCE requires the use of
an appliance adapter as approved by the one
of vent manufacturers listed on page 27.
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.
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.
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)
NOTICE
WARNING
WARNING