Water Connections - Riello Condexa PRO NA 75P Installation, Operation And Service Manual

INSTALLATION

2.7 Water connections

The dimensions and position of boiler's hydraulic connections are shown in the table below.
RI
DESCRIPTION
A
B
C
D
E
F
MI (system supply)
RI (system return)
SC (condensate drain)
G (gas inlet)
9
NOTE: Before connecting the boiler the protection plugs must
be removed from the supply, return and condensate drain
pipes.
9
CAUTION: Before connecting the boiler, it is necessary to clean
the system. This step is required when the appliance replaces
another one on pre-existing systems.
In order to carry out this cleaning activity, if the old boiler is still
installed on the system, it is advisable to:
− add a de-scaling additive.
− Operate the system with the boiler on for around 7 days.
− Discharge the dirty system water and flush the system one
or more times with clean water.
If the system is very dirty, repeat the last procedure one more time.
If the old boiler is not present or available, use a pump to circulate
the water + additive through the system for about 10 days and
perform a final washing as described in the previous paragraph.
Once the cleaning has been completed, it is recommended to add
a suitable protective fluid to the system's water before installing
the boiler.
Front view
MI
Condexa PRO NA 75 P
15 3/16" (386mm)
5 5/8" (142mm)
2 1/2" (64mm)
11 1/8" (282mm)
3 15/16" (99mm)
3 5/8" (91mm)
NPT 1" 1/2 M
NPT 1" 1/2 M
1"
NPT 1" 1/4 M
In order to clean the heat exchanger's built-in water system,
please contact your local
tance.
0
CAUTION: Do not use incompatible liquid detergents, including
acids (for instance, chloridric acid and similar) in any concen-
tration.
0
CAUTION: Do not subject the heat exchanger to cyclical pres-
sure changes because fatigue stress is very dangerous for the
integrity of system components.
The boiler, when used in connection with a refrigeration system,
must be installed so the chilled medium is piped in parallel with
the boiler with appropriate valves to prevent the chilled medium
from entering the boiler.
The boiler piping system of a hot water boiler connected to heat-
ing coils located in air handling units where they may be exposed
to refrigerated air circulation must be equipped with flow control
valves or other automatic means to prevent gravity circulation of
the boiler water during the cooling cycle.
18
Bottom view
A
B
C
D
E
F
Condexa PRO NA 117 P
15 3/16" (386mm)
5 5/8" (142mm)
2 1/2" (64mm)
11 1/8" (282mm)
3 15/16" (99mm)
3 5/8" (91mm)
NPT 1" 1/2 M
NPT 1" 1/2 M
1"
NPT 1" 1/4 M
R boiler distributor for further assis-
Ø / inch
Ø / inch
Ø / inch
Ø / inch