STOKVIS ENERGY SYSTEMS ECONOFLAME R30, Installation Operation & Maintenance, Page: 11 / 36

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Burner/heat exchanger package [15]
After the gas/air mixture has been correctly mixed, it fl ows into the burner via the inlet channel.
Due to the overpressure, the gas/air mixture is forced through the burner to the external surface
of the burner for combustion.
The heat exchanger is made of smooth stainless steel tubes in the form of coils. It essentially
consists of two parts; one part is located immediately next to the fl ame, where the major por-
tion of the heat transfer between the combustion gases and the water takes place. The other part
functions as a condenser for the fl ue gases, where the transfer of latent heat takes place.
Stainless steel water distribution manifolds ensure optimum water fl ow through the heat ex-
changer.
Water connections
These consist of a fl ow connection [4] and a return connection [7]. There is a water temperature
sensor [16] on the fl ow connection which, apart from controlling the burner load, also monitors
the water fl ow in the boiler. The latter is done in combination with the fl ue gas temperature sensor
[8].
Boiler pump [20]
The boiler pump of the types 45, 65 and 85 is located in the return connection of the boiler and
is electrically connected directly to the corresponding terminals in the control panel. The boiler
pump of the types 100 and 120 will be delivered separately and can be directly connected to the
return connection of the boiler. The capacity and the head of the pump are adequate to overcome
not only the boiler resistance but also some system resistance (see table 1). In the types 45, 65
and 85, the pump has three-stage modulation, depending on the load.
Condensate drain [13]
The boiler is equipped with a bottle trap. This bottle trap is located on the bottom side of the ap-
pliance and can be easily fi lled with water.
Frame [14]
The frame is the load bearing part of the boiler. All the components are installed on it.
Casing [6]
The casing can be removed easily as one unit. To do this, unscrew the 8 screws found on the top
and the bottom of the casing.
Electrical equipment
This comprises the control system and safety devices of the boiler. The connection terminals are
installed in a fully sealed enclosure behind the control panel [21]. This panel can be tilted through
90° after removing the control panel bolt. This provides access to all the electrical connections,
without the need to remove the casing.
2.3 Boiler control
If heat is required, the boiler will start, if all necessary conditions have been fulfi lled and no
safety devices have been triggered. This heat requirement will arise if:
- The
fl ow temperature of the boiler is less than the required fl ow temperature
- The manual option has been selected using selector switch set to:
W1
or
W2
.
- The frost protection has been triggered independently of the operating conditions (
K
,
q
,
t
,
W1
or
W2
).
The integrated temperature controller adjusts the heat input inside the boiler by changing the fan
speed so that the desired temperature is reached and kept at a constant level. Depending on the
quantity of air displaced by the fan, a specifi c quantity of gas will be added. As a result, the boiler
capacity can be modulated seamlessly and the heat requirement can be accurately monitored. If
the fl ow temperature rises above the desired level together with any hysteresis, the boiler will
switch off. The boiler will start again as soon as the fl ow temperature falls below the desired
level.