27
Air Handling Units
Gas Heater Section (CRVBG)
Component
Place of installation
Pt100 – flue-gas tempe
-
rature sensor
to the flue-gas exhaust(
-
flue-gas duct)
it must be installed du-
ring device assembly
ESD3G – triple ther-
mostat
gas heater section (be-
hind the heat exchanger,
following the airflow
direction)
installed by the ma-
nufacturer
TH 167 – emergency
thermostat
just preceding the gas
heater section
it must be installed du-
ring device assembly
NS 120 – inlet air tem-
perature sensor
behind the gas heater
section, e.g. in the
ducting 3 m behind
XPTG section, to allow
the air to be mixed
it must be installed du-
ring device assembly
NS 120 – flue-gas tem
-
perature sensor
behind the gas heater
section, e.g. in the
ducting 3 m behind
XPTG section, to allow
the air to be mixed
it must be installed du-
ring device assembly
Section description
The casing of the section is made of aluminium frame sec-
tions and 50 mm thick thermally insulated panels.
The air is heated by flowing around the combustion cham
-
ber and its tube plate.
A flange for the burner mounting is situated on the front
(service) side of the heat exchanger. The flue gases are
drawn off via the chimney outlet (optionally on the rear side
of the section). Sections are manufactured in two versions
- either with or without the bypass. The bypass version is
equipped with a damper to regulate air flow. Furthermore,
the gas heater section is provided with a condensate drain
outlet (1/2“ pipe).
Connection of Gas Heater
The XPTG gas heater section must be connected to the
air duct via a dilatation insert heat resistant up to 200 °C.
The gas-flue ducting must comply with all applicable di
-
rectives and standards of the state of installation (for CZ
- ČSN 73 4201 and ČSN 73 4210), and must be performed
by a specialized provider. For information on installation,
commissioning and inspections of the gas indirect heater
and burner, refer to the special Installation and Operating
Instructions which are included in the accompanying docu-
mentation of the air-handling unit.
Safety and control elements delivered with the section
must be connected to ensure proper, reliable and safe
operation.
Table 1
–
included M&C components
Never start up the gas heater section if the air-han-
dling unit is stopped, otherwise the hazard of local
overheating of the air-handling unit will occur, which
can damage some components (e.g. drop eliminator).
Gas Heater Section Start-Up
The gas heater is a special gas device which is characte-
rizer by a special activation procedure (commissioning).
After completing the air-handling unit installation, it is
necessary to place a separate order for the gas burner
activation with the gas heater manufacturer or their re-
presentative. In addition to the gas burner adjustment,
the interconnection of safety thermostats and the control
circuits of the gas burner and air-handling unit (fans) must
be checked during the gas heater commissioning. A com-
missioning report, which also includes settings of the gas
heater temperatures and the results of testing of emergen-
cy and safety components, must be drawn up upon putting
the gas heater into operation.
Separate documentation from the combustion chamber
manufacturer is delivered with this section.
This section can be delivered for indoor as well as for out-
door use. The burner and triple safety thermostat of the
outdoor version are protected by covers.
A burner operated in an outdoor environment up to -20°C
must be provided with a heating cable switched by the
thermostat. As standard, this set is included in deliveries
marked as TKW 53 for burners WG 10, WG 20, or as TKW
88 for burners WG 30, WG 40.
A burner operated in an outdoor environment from -20°C
to -40°C must be equipped with a special heated cover of
the burner and a burner flange for the external air inlet
Burner closed heated cover installation
The external air inlet to the burner's extension is made
from a Spyro hose. An aperture in the burner cover for the
hose must be created in the appropriate location; the hose
must be sealed in this aperture. Inlet air must come from
the heated room.
The SK 3102.000 300W heating equipment will be atta-
ched on the heater panel under the burner valve block
using a holder (enclosed, including 4 screws). Electrical
connection will be made using a seven-pin connector at
the burner. The heating power supply is ensured directly
from the burner; therefore, the burner's "L" terminal must
always be under voltage.
The thermostat of the burner cover is set to 5°C. If the co-
ver's temperature drops below the pre-set temperature, the
heating is switched on.
