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ZILMET USA
INSTRUCTIONS FOR INSTALLATION AND OPERATION OF ZILMET USA EXPANSION TANKS
INSTALLATION IN PUMP SYSTEMS FOR STORAGE AND LIFTING OF POTABLE WATER
After the back-flow preventer at the exit of the pump, as shown in the picture.
Note: pre-charge of the tank must be set 3 psi lower than the minimum pressure switch setting at which the pump starts.
INSTALLATION IN SOLAR SYSTEMS
For installation and operation review the system norms. Solar vessel must be installed in the supply line of the solar collector through use of a
suitable temperature-resistant solar ball valve with a shut off to the system. The maximum working temperature in the membrane may not exceed
212 °F. This can be achieved by installing a temperature control system or using a vessel for compensating temperatures (type ZILMET VSG). The
solar vessel must be installed in frost-free areas and have no direct heat. During the start-up, the pre-charge of the vessel must be adjusted
according to the system data and must be written on the label. When checking the systems pressure, the maximum working pressure of the solar
vessel must be considered and, if necessary, the solar vessel must be separated from the system. The solar vessel is resistant to 70% antifreeze.
The use of proper anti-scale and corrosion inhibitors additives is required in solar systems.
PROFESSIONAL INSTALLATION REQUIRED
400 Frenchtown Road - East Greenwich, RI 02818 – phone 401 884 4943
A = Manometer
C = Globe valve
E = Safety valve
G = Switch board
I = Interchangeable membrane pressure tank
Do not insulate the connecting pipe or the solar expansion vessel.
Beware: this can get hot. Therefore, precautions should be taken
to ensure that access to this equipment is restricted. Do not install
where children are present or may be present.
Maintenance notes for solar vessels
When solar expansion vessel is connected to the system using a
butterfly solar valve, please follow these instructions before
performing gas pre-charge checks: 1) close the knob and open the
drain nipple to completely drain the tank, then check the pre-
charge pressure; 2) after checking the pre-charge pressure, close
the drain nipple and open the knob. When opening the drain
nipple of the butterfly valve to drain the solar expansion
vessel, please note that the solar fluid coming out from the
butterfly valve may be hot: therefore precautions must be
taken to avoid property damage, scalding and/or bodily injury.
When rinsing the solar system, the solar vessel must be separated
from the system by closing the ball valve outlet, thereby preventing
dirt particles from entering the solar vessel. Dirt particles may
cause damage to the membrane or corrosion.
Pay particular attention to the fact that the solar fluids may
undergo to chemical degradation (pH lowering) due to thermal
effect, causing corrosion of the tank and of other parts of the
system. This may happen also when the system is not working,
due to the stagnation of the fluid in the solar panels. The personnel
in charge of installation, commissioning and maintenance must
take into account this possibility and must follow the instructions of
the supplier of the solar fluid regarding periodical substitution of
the fluid itself and/or adding proper additives to the system.
rev. Sep2020
B = Backflow preventer
D = Pressure switch
F = Basin with submerged pump/
H = Water system
page 4 / 7
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