Service manual

6
FCX INSTALLATION AND SERVICE MANUAL
INSTALLATION
PP/PVC Concentric Elbow
- joint fitting -
Fig. 11
Reference No Bend I.D. O.D.
MPI Part 2204 45 deg 3.15” 4.92”
(N40.28395) (80mm) (125mm)
MPI Part 2205 90 deg 3.15” 4.92”
(N40.28396) (80mm) (125mm)
Fastening collar (option)
Fig. 12
Reference No Number Ø mm
MPI Part 2208 3 125
(B00.29727)
Collars are essential to bear the weight of the vertical
extensions so that the heating system does not bear the weight,
as well as horizontal runs preventing sagging and pooling of
condensate.
Polypropylene Roof Plate
Fig. 13
Reference No Color
MPI Part 2207 Black
(A90.12172)
45° bend 90° bend
TYPICAL INSTALLATION EXAMPLES:
The flue/combustion air system piping may be either horizontal
or vertical or a combination of both, observing the following:
• The maximum unrestricted horizontal or vertical flue length
shall not be more than 16.4 ft (5 m), if using the HeatWise
burner.
• For each 90-degree elbow used in the flue system, subtract
3.28 ft (1m) from the total allowable length.
• For each 45-degree elbow used in the flue systems,
subtract 1.64 ft (0.5m) from the total allowable length.
• Horizontal runs of the flue system must pitch back 3/4 inch
per yard (2 cm per m) of length towards the heating system
to ensure proper flue products condensate drainage.
• Termination of a horizontal flue system shall not be less
than 2 ft above grade or 1 ft above average snow level as
shown in fig. 15 and 16 or as dictated by local codes.
• Do not place the flue terminal less than 6.56 ft. (2 m) from
a ventilation hole or opening in a building. NOTE: This is an
important concideration if unit is used year round (domestic
hot water production) where windows may be open.
• Termination of a vertical flue must provide at least 12 inches
(30cm) above the roof jack to the combustion air intake
collar.
• If there are two units in the installation with vertical flue
systems, the termination of the systems must be separated
by 24 inches (60cm).
Fig. 14
All flue-piping components must be assembled and supported
to provide an airtight flue/ combustion air system.
Application of liquid soap over the flue pipes to be joined will
aid in assembly of the parts.
Typical installation examples appear in the illustration that
follow.
Straight Balanced Flue Configuration
Fig. 15
Option: Straight Horizontal Flue Kit
2 ft minimum