Carrier 50FC Installation, Operation And Maintenance Instructions page 41

12 - FACTORY OPTIONS AND ACCESSORIES
Connections at the fl ue
Important: The fl ue of the gas burner is not supplied with
the unit. Its design and installation is the responsibility of
the installer and must comply with all the directives and
regulations in force in the installation location.
PCH080
Fumes exhaust: internal ∅ 80mm
This PCH burner module is fi tted with a watertight combustion
circuit and with the burner fan located upstream of the heat
exchanger.
Connection to the fl ue, according to how the heater is installed,
can be made as "C" type, with combustion air being drawn from
outside, or as "B" type with combustion air being drawn from the
heater installation site.
If the heater is installed outdoor, a "B" type installation is also a
"C" type.
More specifi cally, the heater is certifi ed for the following exhausts:
B23P-C13-C33-C43-C53-C63; for more information on the fl ue
types, please refer to current regulations.
To fi t the fume exhausts, certifi ed pipes and terminals must be
used, taking into account that the modules are of a condensing
type; the following material must be used:
• aluminium with a thickness of at least 1.5 mm;
• stainless steel with a thickness of at least 0.6 mm; the steel must
have a carbon content of at least 0,2 %.
Use sealed pipe to prevent condensation from leaking from the
pipes; the seal must be adequate to withstand a fume temperature
ranging between 25°C and 120°C.
The fl ue does not need to be insulated to prevent the build-up of
water in the pipes, as this does is not detrimental to the heater,
which is fi tted with a water trap. Insulate the pipe if required to
protect the fl ue from accidental contact.
For the air intake, use:
• aluminium with a thickness of at least 1.0 mm;
• stainless steel with a thickness of at least 0.4 mm;
Important: The horizontal sections of fl ue, which make up the
fume exhaust, must be installed with a slightly incline (1°- 3°)
towards the heater, in order to prevent the build of condensation
in the exhaust.
Common exhausts (PCH130, PCH160 and PCH210)
Where possible, it is always preferable to use independent
exhausts; PCH module exhausts are pressurised, therefore in
this way it is possible to prevent incorrect sizing from causing a
system malfunction.
When common exhausts are fi tted, they must be designed by
providing some anti-refl ux valves at the outlet of each fl ue, before
the connection with the common fl ue, preventing a module from
discharging it own combustion gases inside another module.
Terminal confi guration
■ Type B23P
Open combustion circuit: the gases produced by the
combustion are discharged outside, on a wall or on the roof,
and the combustion air is directly drawn from the site where
the equipment is installed.
PCH130, PCH160 & PCH210
In this case, the standards UNI-CIG 7129 and UNI-CIG 7131
require the provision of suitable vents on the walls.
Note: It is compulsory to fi t an IP20 safety mesh to prevent
solids with a diameter higher than 12mm from entering the
combustion air intake; at the same time, the mesh opening
must not be lager than 8mm.
■ Type C13
Sealed combustion circuit (type "C") connected to a horizontal
terminal on the wall by means of its own ducting.
■ Type C33
Sealed combustion circuit (type "C") connected to a vertically
installed terminal (on the roof) by means of its own ducting.
■ Type C53
Sealed combustion circuit (type "C") connected by means of its
own ducting split in two terminals which could end up in areas
with diff erent pressure (such as a ducting connected to the roof
and a second one connected to the wall).
■ Type C63
Sealed combustion circuit (type "C") connected to an approved
and separately sold combustion air supply and combustion
products exhaust system.
Selection Guide
If the terminal is not directly connected to the heater and, therefore,
extra routing is required, according to the length of the ducting,
the diameter of the selected terminals, extensions and bends
must be checked.
After establishing the routing, the pressure drop must be calculated
for each component; each component has a diff erent pressure
drop value as the glue gases fl ow rate is diff erent.
The pressure drops of each component identifi ed must be added,
checking that the result is no higher than the value available for
the PCH heater module used; if a combustion air supply pipe is
fi tted, the pressure losses must be added to the fume exhaust
pressure drop.
If the sum of pressure drops caused by the fi ttings are higher than
the pressure available at the exhaust, ducting with higher diameter
must be used, rechecking the calculation; a pressure drop higher
than the pressure available at the fume exhaust reduces the heater
module thermal output.
If the duct routing requires the use of bends, the length required
must be subtracted from the available length:
• Ø 80 wide radius bend at 90° EqL = 2.1m
• Ø 80 wide radius bend at 45° EqL = 1.1m
• Ø 100 wide radius bend at 90° EqL = 3.5m
• Ø 100 wide radius bend at 45° EqL = 1.6m
Pressure drop for terminals and exhaust ducting:
PCH model
Pressure avail. at the exhaust
(Pa)
Component
Ø 80 pipe (1 metre)
Ø 100 pipe (1 metre)
Ø 80 wide radius bend at 90°
Ø 100 wide radius bend at 90°
Ø 80 wide radius bend at 45°
Ø 100 wide radius bend at 45°
Ø 80 - 100 adaptor
Ø 80 hooded terminal
Ø 100 hooded terminal
130 160
080 105
(2 x 065) (2 x 080) (2 x 105)
120 120 120 120
Pressure drop (Pa)
7,3 11,0 4,6 7,3
2,2 3,5 1,3 2,2
15,0 22,2 9,5 15,0
8,2 12,0 5,1 8,2
7,3 11,0 4,6 7,3
3,5 5,5 2,2 3,5
1,8 2,7 1,2 1,8
16,0 20,0 14,0 16,0
12,0 15,0 10,5 12,0
210
120
11,0
3,5
22,2
12,0
11,0
5,5
2,7
20,0
15,0
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