Hydraulic Connections - AERMEC RTE240 Installation And Maintenance Manual

Norms covering the use
of R410A gas
Rooftop units functioning with refrigerating
R410A gas require particular attention at
the assembly stage and during maintenance
so as to keep them from malfunctioning.
It is therefore necessary:
- To avoid refilling with oil different
from the one specified which is
already pre-charge in the compressor.
- If there are gas leaks implying that
the Rooftop units are even partially
empty, do not refill the refrigerant
partly but completely drain the
machine and after evacuating it
completely fill it again with the
amount required.
- In the event of replacement of one of
the refrigerating circuit parts, do not
leave the circuit open for more than
15 minutes.
- I n p a r t i c u l a r , i n t h e c a s e o f
substitution of the compressor,
complete the installation within
the above mentioned times after
removing the rubber caps.
- Do not power up the compressor if it
is empty; do not compress air inside
the compressor.
- If you use R410A gas tanks, please pay
attention to the maximum number of
withdrawals you can make in order to
ensure the correct ratio of the components
in the R410A gas mixture.

Hydraulic connections

Condensate drain pain
The condensate drain pan has a
threaded drain pipe 1" G UNI 338.
The drainage system should feature an
adequately sized siphon to:
• allow the free drainage of the
condensate;
• prevent the undesired inlet of air in
the vacuum systems;
• prevent the undesired air leakage
from pressure systems;
• prevent bad smells or insects from
infiltrating.
Here below you will find rules to adopt
for the dimensioning and creation of
syphons in the case of pressure and
vacuum tanks fig.06.
Manual selection, installation and maintenance
Negative pressure:
H1 = 2P
H2= H1 / 2
Positive pressure:
H1 = 2P
H2= H1 / 2
P
neg.
H3
H1
H2
G072, G92, G150 gas
supply system
For this system, use CE-approved and
certified components only.
G072, G105, G150 modules are sup-
plied with:
- a double gas valve;
- a gas filter and stabiliser;
already installed.
All components are assembled into the
burner housing.
To complete installation in compliance
with the law, the following components
have to be installed:
40
Roof-top units - RTE series-
where P is the internal pressure expressed
as mm of a water column (approx. 1 mm
= 9.81 Pa), This pressure is indicated in the
relevant label near the condensate drainage
point. The syphon must be equipped
with a plug for the cleaning at the
bottom or must anyway allow for fast
dismantling for cleaning purposes.
P
pos.
H3
H1
H2
- vibration damping joint;
- gas cock.
We recommend installing a gas filter
with a high flow rate and no pressure sta-
biliser. In fact, the standard filter installed
before the gas valve has a limited surfa-
ce.
To assure efficient maintenance, use a
gasket and a swivel joint to connect the
G072, G92, G150 module.
Do not directly use threaded joints on
gas fitting.
The law allows a maximum pressure
of 40 mbar inside the building or ther-
mal plant. Higher pressure values shall
be reduced before the room where the
G072, G105, G150 module is installed.
fig.06