OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 28 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 2: INSTALLATION
2.11 Flue Gas Vent Installation
PVI
’s
Centurion Venting and Combustion Air Design Guide
should
be consulted before any flue
or combustion air venting is designed or installed. Suitable, U/L approved, positive pressure,
watertight vent materials MUST be used for safety and UL certification.
1. Go to:
Main Menu
→
Advanced Setup
→
Unit
→
Unit Settings.
Figure 2-16: Unit Settings Screen
2. Find the
Vent Type
parameter.
3. Set parameter to match your vent material: PVC, CPVC, Polypro or Stainless Steel. This
sets the exhaust temperature limits. Note, PVC is not allowed in Massachusetts.
Because the unit is capable of discharging low temperature exhaust gases,
the flue must be
pitched back towards the unit a minimum of 1/4" per foot (0.64 cm per 0.3 m)
to avoid any
condensate pooling and to allow for proper drainage.
While there is a positive flue pressure during operation, the combined pressure drop of vent and
combustion air systems
must not exceed 140 equivalent feet (42.7
m) or 0.8” W.C. (199 Pa)
.
Fittings as well as pipe lengths must be calculated as part of the equivalent length. For a natural
draft installation,
the draft
must not exceed -
0.25” W.C. (-62 Pa)
. These factors must be
planned into the vent installation. If the maximum allowable equivalent lengths of piping are
exceeded, the unit will not operate properly or reliably.
2.11.1 Installing the Exhaust Connection for PVC/CPVC (P/N 24786)
Align the 8” exhaust starter piece (P/N 24786) with the holes on the exhaust manifold of the unit.
Fasten the starter piece to the exhaust manifold using the four (4) washers and bolts supplied
with the unit. Insert the PVC stack into the starter piece and fasten with the three supplied
screws evenly spaced 120 degrees apart, as shown below. Apply a bead of high temperature
RTV around the top rim of the starter piece to create a seal between the starter piece and PVC.
