Closed Expansion Vessel System - Nordica ITALY Termo - DSA Handbuch

ITALY Termo DSA
1. OPEN EXPANSION Tank: which has a capacity of 10% of total water content of thermo-product and of the
installation. This is installed at the highest point of the system, at least 2 m over the radiator that is at the highest
level.
2. SAFETY PIPE : that connects through the shortest way, without descending or siphoning parts, the delivery of
thermo-product to the upper side of open expansion tank. The minimum diameter of safety pipe is 1"gas.
3. LOAD PIPE : which connects the bottom of open expansion tank with the return pipe of installation. The
minimum diameter must be ¾" gas. All those parts must no have for any reason meditate intercept bodies that
could accidentally exclude them and must be placed in rooms which are protected from frost. On the contrary, if
they freeze, the boiler body could break or even explode. In case of frost placing it will be right to add a proper
percentage of antifreeze liquid to the water of installation in order to delete the whole problem. In no way there
must be water circulation in the open expansion tank between the safety and loading pipe. This would cause the
water oxygenation and the consequent corrosion of thermo-product and installation in a very short time.
4. THERMAL DISCHARGE VALVE which is a further positive safety that prevents the boiling even when electric
energy is missing. It is made by a valve cover like a pressure safety valve which differs from it as it opens by
reaching a pre-calibrated temperature (normally at 94 – 95° C) and unload hot water from the installati on
delivery. This will be replaced with as much cold water coming from the open expansion tank loading pipe of
open tank by draining away the excessive heat.
5. SAFETY VALVE FROM 1,5bar: maximum operation pressure allowed for the system is 1,5 bar (equal to 15m
of the water column). Higher pressures can cause deformation and breakage of the boiler body.
6. SAFETY DEVICES envisioned by Regulations in vigour.
7. CIRCULATION PUMP : . It would be better to install it on the return in order to avoid that it could disconnect
itself at very high water temperatures but checking that it does not drive water in the open expansion tank
otherwise it should cause a continuous water oxygenation with consequent, fast corrosion of boiler body. It must
be not to avoid a forced circulation in the open expansion tank. Furthermore it must be electrically connected to
a thermostat or a electronic control unit that can be purchased with the thermo-fireplace as OPTIONAL part.
8. AUTOMATIC THERMOSTATIC MIXING VALVE – (see chapter 3.3)
IMPORTANT: temperature safety sensors must be in place on the machine at a distance no greater than 30 cm from
the flow connection of the thermo-product.
Whenever the thermo products lack a device, those missing can be installed on the thermo product flow pipe, within a
distance no greater than 1m from the thermo product.
ATTENTION: For no reason must the fire be ignited before the system has been completely filled with water;
doing this would lead to serious damage of the entire structure. The system must be filled by
means of the loading pipe directly from the open vessel tank in a way to prevent an excessive water
pressure network deforming the body of the thermoheating stove.
The system must be kept constantly full of water even during the periods when the use of the thermoheating stove is
not requested. During the winter, inactivity must be faced with the addition of antifreeze.
3.2.

CLOSED expansion VESSEL system

It is COMPULSORY that the CLOSED expansion VESSEL system is provided with:
1. A 3 bar SAFETY VALVE:
water column). Higher pressures can cause deformation and breakage of the boiler body
2. AUTOMATIC THERMOSTATIC MIXING VALVE – (see chapter 3.3)
3. HEAT DISCHARGE VALVE or HEAT SAFETY DISCHARGE (positive safety, therefore, this continues
discharge, should the valve be damaged)
4. CLOSED EXPANSION VESSEL
5. PUMP CONTROL THERMOSTAT
6. NOISE ALARM ACTIVATION THERMOSTAT
7. NOISE ALARM
8. TEMPERATURE INDICATOR
9. PRESSURE INDICATOR
10. PUMP SYSTEM
7095802 Rev.01 – EN
maximum operation pressure allowed for the system is 3 bar (equal to 30m of the
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