Do Žlábku 733, 514 01 Jilemnice
Subject:
MTP Technical documentation
Page No./No. of pages:
6/20
1.
Heat exchanger
The heat exchanger used in the MTP, MTP-AL and MTP-V air heaters is a weldment
consisting of a cylindrical or a drop-shaped combustion chamber and a subsequent tube
heat exchanger. According to the size, heat exchanger is made as a three-tier (up to MTP
400) and four-tier for larger sizes. The combustion chamber is reversing, for the heat
exchangers of P1 and P2 type, it is a one-way chamber. The heat exchangers are
manufactured according to the thermal load and according to the customer requirements
from the materials of the class 11, stainless steel and refractory materials.
The heat exchanger is circled around and cooled down from outside by the air that is
thus heated.
2.
Heat exchanger unit
The heat exchanger is located in a cabinet that is made of frame structure and
casing, or can be made from components according to the customer requirements, but
must always be made of insulated sandwich panels with a minimum thickness of 20 mm.
Typically, the casing consists of a perimeter construction made from modular profiles
filled with panels, possibly also a frameless casing structure. The combustion chamber
is anchored in the casing by means of the heat exchanger legs, which are free due to
the dilatation, and by means of a burner flange for fixing the burner and the chimney.
The chimney serves for removing the spent fuel from the combustion chamber through
a chimney outlet, usually in the rear wall of the heater, the heater with the heat exchanger
525 and higher, on the burner wall, optionally on another side.
In most cases, the heater is equipped with a bypass, which is a separate part in the
casing outside the space that is occupied by the heat exchanger and is fitted with a valve.
A portion of the heated air can then flow through the bypass completely outside the heat
exchanger, however, in such a way that the amount of air passing through the heat
exchanger is not less than the amount of air required for maximum heating on the heat
exchanger (30-
55 °C unless otherwise specified).
Each heat exchanger unit of the heater is fitted with a triple thermostat (T1, T2, T3)
at the output of the heated air, which must be connected to the electrical control circuits of
the complete air heater and which ensures its safe operation mode (for more information
see instructions for installation/electrical installation).
The air is divided by the walls into the heat exchanger and bypass area. In the heat
exchanger area, there are also guide plates which direct the air between the heat exchanger
tubes and an aperture which provides air inlet for sufficient cooling of the combustion
chamber.
3.
MTP-V Specifications:
MTP-V are gas air heaters without their own fan that are designed for installation
into the air-conditioning unit or air-conditioning piping. They do not contain an air fan, but it
is always part of the system and the heater cannot be operated without it.
The MTP-V heaters cover the required dT heating range for air-conditioning heating
from the outside air heating to the required temperature to small air heating to e.g. heat
recovery.
