Robur K18 Hybrigas, Installation, Use And Maintenance Manual, Page: 33 / 60

Heating engineer
Installation, use and maintenance manual – K18 Hybrigas
33
3
1.3
p. 10).
Boiler module:
▶
Ø 80 mm (with gasket), on the rear, at the top (detail K Figure
1.3 p. 10).
The appliance is supplied with 2 flue gas exhaust kits, to be fitted
by the installer.
How to install the flue gas exhaust kit
1. Remove the cover applied to the flue gas exhaust.
2. Fit the terminal onto the collar on the flue gas exhaust.
The cover prevents water and/or foreign bodies en-
tering the appliance before the exhaust kit is installed.
The cover should thus be removed only when actually
installing the exhaust kit on the appliance.
Possible flue
The fumes exhaust may be wall-mounted , but it can also be easi-
ly conveyed over the ridge of the roof because the residual head
allows the ducts to be extended by some tens meters, if the local
regulations require this.
The two distinct flue gas exhaust ducts can be conveyed sepa-
rately or via a unified flue.
Table 3.4
p. 33 below shows the characteristics of the fume
outlet of the K18 Hybrigas unit.
Table 3.4
Characteristics of K18 Hybrigas flue gas exhaust
K18 Hybrigas
37/2
Installation data
Type of installation
(heat pump)
type of installation - B23P, B53P
Fume outlet
diameter (Ø) mm 80
residual head Pa 70
Type of installation
(boiler)
type of installation - B23P, B33
Boiler fume outlet
diameter (Ø) mm 80
residual head Pa 100
Table 3.5
p. 33 below shows the characteristics of the combus-
tion products of the heat pump module.
Table 3.5
Characteristics of K18 Simplygas combustion products
K18
Percentage CO
2
in fumes
Nominal thermal
capacity
G20 % 9,00 (1)
G30 % 10,50 (2)
G31 % 10,00 (3)
Flue temperature
Nominal thermal
capacity
G20 °C 60,0
G30 °C 60,0
G31 °C 60,0
FUMES FLOW RATE
Nominal thermal
capacity
G20 kg/h 19
G30 kg/h 19
G31 kg/h 21
Installation data
type of installation - B23P, B53P
Fume outlet
diameter (Ø) mm 80
residual head Pa 70
(1) 8,8 ÷ 9,2.
(2) 10,3 ÷ 10,7.
(3) 9,8 ÷ 10,2.
Table 3.6 p. 33 below shows the characteristics of the combus-
tion products of the condensing boiler module.
Table 3.6
Characteristics of K18 Hybrigas boiler combustion products
K18
Hybrigas
Boiler
Installation data
Percentage CO
2
in
fumes
Nominal thermal
capacity
G20 % 9,44
G30 % 11,10
G31 % 10,20
Minimal thermal
capacity
G20 % 9,04
G30 % 10,50
G31 % 10,05
Flue temperature
Nominal thermal
capacity
G20 °C 73,7
FUMES FLOW RATE
Nominal thermal
capacity
G20 kg/h 28
Minimal thermal
capacity
G20 kg/h 5
For each of the flue gas exhausts to be realized:
▶
The flue must be designed, sized, tested and constructed by
a skilled form, with materials and components complying
with the regulations in force in the country of installation.
▶
For the heat pump module, always provide a socket for flue
gas analysis, in an accessible position. The condensing boiler
module already has it (detail C Figure 1.9 p. 16).
For the design of any unified flue for the modules of K18 Hybrigas
unit, in addition to what previously stated, you must consider
that:
▶
it is mandatory to install a flap valve on the exhaust of each
module (heat pump and boiler);
▶
in case the flap valves are installed outside, an appropriate
UV ray protection must be assured (if the valve is construct-
ed in plastic material) as well as protection from potential
winter freezing of stagnant condensate backflow.
In case of flue gas discharge to the roof, use a Tee at the
base of the vertical pipe, with proper condensate drain,
provided with siphon, to be connected to a suitable dis-
charge manifold.
3.11
FLUE GAS CONDENSATE DISCHARGE
The K18 Hybrigas unit is a condensing appliance and therefore
produces condensation water from combustion flue gases.
Condensate acidity and exhaust regulations
The flue gas condensate contains aggressive acid sub-
stances. Refer to applicable regulations in force for con-
densate exhaust and disposal.
▶
If required, install an acidity neutraliser of adequate capacity.
Do not use gutters to discharge the condensate
Do not discharge the fume condensate in gutters, due to
the risk of materials corrosion and ice formation.
Flue gas condensate connection
The connection for flue gas condensate discharge is located on
the rear of the appliance (reference E in Figure 1.3
p. 10).
▶
The condensate discharge pipe must be connected to a suit-
able discharge manifold.
▶
The junction between the pipe and the manifold must re-
main visible.
▶
If the condensate drain is routed indoor, a suitable siphon
needs to be installed on the pipe.