Connecting The Room Thermostat - Munters GFn Manual De Uso Y Mantenimiento

the fuel lines. The fuel line connections and settings
must comply with the requirements of local and
national laws in force.
The GFn air heater burner and fuel pump was
calibrated by test firing for correct operation and
combustion at Munters factory. Detailed information
about factory settings see Appendix. There is no
need to make any adjustments on site (moved from
the end of the paragraph).
The following safety guidelines should be observed
closely when connecting the diesel (oil) line to the
air heater:
• the diesel (oil) connection and circuit must comply
with local and national regulations;
• the diesel (oil) connection and circuit must adhere
to all fire prevention regulations;
• it is mandatory to provide diesel (oil) fuel to the air
heater by means of diesel filter, suction pipe with
foot valve and backflow (return) pipe from
external certified fuel tank;
• the diesel piping system and fittings must have
the proper diameter designed proportional to the
length of the pipe and the fuel pressure;
• each time the air supply or fuel pump are
adjusted, the exhaust emissions values must be
properly checked;
• the oil in the supply line must not be under
pressure (maximum permissible pressure on
suction/return line 2 bar). Do not insert any
additional devices such as pumps, etc. in the fuel
supply circuit.
Before connecting the diesel (oil) line to the air
heater it is recommended to:
• clean thoroughly all fuel line pipes and fittings to
remove any residues which can compromise the
correct functioning of the burner;
• check that the local condition (distribution, nature
and fuel pressure values) of the fuel line is
compatible with the present state of the air
heaters settings
settings);
• make sure that air inside the diesel (oil) line is
completely removed;
precautions to prevent presence of air inside
diesel line including bleeding air from fuel line,
constant monitoring and proper maintenance of
the diesel line.
All GFn air heaters are fitted with fuel filter as
standard, and double (inflow and return) fuel supply
line. Connect the inlet pipe from the fuel line to the
3/8" inlet fitting and the return hose to the fuel line to
the 3/8'' outlet fitting as shown (see fig. 6).
NOTE Diesel fuel filter assures that no particle that
might be present into the fuel could reach the
burner. This is vital for proper working of the burner.
Fuel filter has to be maintained by cleaning it
regularly and under no circumstance should be
removed or by-passed.
(fuel type and calibration
take the necessary
When using the air heater, make sure that diesel
filter doesn't present leakage. The user must adopt
the necessary safety precautions in case suspect
diesel leakage. The user must clean up the fuel
leakage immediately and repair the fault that causes
the leakage.
NOTE Diesel piping, hydraulic components and
fittings are not included with the air heater package
and must be provided by the user.
WARNING
grounding connection.

5.6 Connecting the room thermostat

WARNING
technician is allowed to perform all the operations
described in this chapter.
The room thermostat is an optional accessory
typically placed in the application area and allows
the user to remotely set the target temperature. The
room thermostat is not supplied with the air heater;
it is available only on request.
The GFn air heater is designed to operate only in
automatic mode with room thermostat or external
controller (farm controller).
The GFn air heaters are delivered as standard with
a 5 poles plug socket (without internal jumper), for
making the necessary electrical connection:
NOTE The air heater will start only if the thermostat
plug with internal jumper is connected or the room
thermostat or external controller (farm controller) is
connected.
• operation with external controller: make the
necessary electrical connection as indicated in
the wiring diagram below (fig. 7). Make sure the
thermostat plug supplied with the unit is properly
wired, connected and locked to the appropriate
socket on the electrical control box.
NOTE
supplied by Munters.
• operation with room thermostat: use a room
thermostat with a hysteresis of ±1°C, 230V type 4
poles and grounding socket (fig. 7/8). Place the
room thermostat plug in the appropriate location
on the electrical control box.
WARNING
points:
• all electric equipment connections must be
performed in accordance with local regulations;
• all electric equipment connections must be
performed only by qualified personnel;
• before using the air heater, it is mandatory to
check that it is properly connected to the room
thermostat;
• do not use undersized electric cables;
10 | © Munters AB, 2019
Do not use the fuel line pipes as
Electric shock hazard. Only qualified
Not needed for wired room thermostats
Carefully observe the following