
25/29
INSTRUCTIONS— GAS AIR HEATER -
MINIGAZ Eco
MH Eco, MC Eco, MV Eco– NT09004I-GB – 29/11/2017
8– COMMISSIONING OF GAS AIR HEATERS
The sizing of the gas network has to be done according the length of the pipes and the type of gas that will be
distributed.
Pressures drop shall not exceed 5% of the network pressure.
Gas connections have to be done according local regulation.
7-1 Connection of Gas air heaters
Inlet pressure is 20 mbar for Natural Gas and 37 mbar for Propane.
1°/
If the network pressure is equal to the requested inlet pressure of gas air blowers :
:
-
in that case install an isolating valve (1) and a filter (2) for each Minigaz.
2°/
if the network pressure is higher than the requested inlet pressure of gas air blowers
:
-
in that case install a isolating valve (1), a filter (2) and a pressure reducer (3) for each Minigaz.
CAUTION: Any higher pressure could destroy the Minigaz gas valve.
To connect the Minigaz to the gas network, use connector (4) and gasket (5) provided with the Minigaz.
Screw the
connector on the network before connecting it to the Minigaz.
Check air tightness of the network till the Minigaz gas valve
(above drawing).
8-1 Working principle:
1– For the commissioning, thermostat shall be on.
The safety relay checks if the lack air pressure switch is on, and then allows the fan starting. The running of the fan is
monitored by this pressure switch. If any air lack occurs, it will stop the cycle of the safety relay.
2- After the pre-ventilation cycle, the light-up electrode is on and the gas valve is opened.
3- If there is no flame detected by the ionisation electrode, a new fire sequence will be done by the safety relay - if not
successful the burner is locked out and requires a manual reset.
4- Once the burner is going on, the fan is started as soon as air temperature reach the set point of the fan pressure
switch ( 30°C à 35°C).
5- In case of fan failure, the overheat pressure switch will switch off the burner if the temperature exceeds 90°C.
CAUTION :
Never switch off the gas air blower before the exhaust fan is stopped. It could damage the heat exchanger and
invalidate the warranty.
7– GAS CONNECTION
Check air tightness of the network till the Minigaz gas valve
4
5
1
2
3
Non fourni