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RTAD-SVX01F-E4
Installation - Electrical
% = % ethylene glycol
°C = Brine temperature
1 = Liquid
2 = Freezing without burst effect
3 = Freezing with burst effect
%
°C
Leaving water temperature (°C)
Gly
col (%)
Using glycol with hydraulic module
If the glycol brine percentage is not at
the recommended percentage
(greyed area), corrosion inhibitor
present in the glycol may not be
efficient enough.
For instance, not only a glycol
protection of 15% will only provide
protection to the unit against freezing
down to -5°C but also it might
generate additional corrosion that
could damage the pumps mechanical
seals.
CAUTION!
Some corrosion inhibitors may be
harmful to the mechanical seal or to
the cast iron of the pump.
In case of application with negative
temperature at the evaporator or
usage of another type of fluid, please
contact your local Trane sales
engineer. A relief valve is located at
pump suction limiting water circuit
pressure at 4 bar. Nitrogen pressure
inside of the expansion tank must be
equal to the geometric height of the
instal 0.5 bar. In order to avoid
air entering in the water circuit,
expansion tank must be inflated with
nitrogen. Pressure must be checked
yearly. For a good pump operation,
pump suction pressure must be
between 0.5 and 3.5 bar when pump
runs.
Heat Recovery Units
The heat recovery condenser(s) is
(are) insulated and a heater is
factory-installed (only available on
Total Heat Recovery units) and will
protect from freezing in ambient
temperatures down to -18°C.
Note: The inlet and outlet tubes and
the optional 3-way valve (Total Heat
Recovery units) should be protected
against freezing by one of the
following methods:
-
install heat tape on all water piping
and around the 3-way valve
- add ethylene glycol or equivalent
anti-freeze fluid.
