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9
INSTALLATION INSTRUCTIONS FOR GAS INSTALLER
9.1 Gas connection
The Gas 610 is suitable for use with natural gas only.
The gas connection is at the top of the boiler module
(see fig. 02). The boiler module is fitted with a gas filter
as standard to prevent dirt from contaminating the gas
valve or burner assembly. An isolating main gas cock
must be installed in the vicinity of the boiler module.
9.2 Gas pressures
The boiler main gas valve can accept an inlet pressure
up to 100 mbars, but MUST have a minimum of 17 mbar
at the gas filter inlet test point when the boiler module
is operating at maximum output. Pressures below this
level can result in lockouts (for multi gas appliance
installations this minimum pressure must be available
at each boiler module with all gas appliances firing on
maximum output).
10
COMMISSIONING
g
Important!!
The operating procedure
described in this chapter applies to each boiler module.
10.1 Initial lighting per module
w
1.
Isolate main power supply of the boiler
module that is going to be put into operation.
g
Important!!
boiler module is out of operation.
2.
Remove the casings on the inspection side.
3.
Check the electrical connections including earth.
4.
Fill the boiler and the system with water
(approximate 1.0 bar).
5.
Vent the system.
6.
Fill the siphon with water.
7.
Check the flue gas discharge connection and air
inlet duct or air supply connection.
8.
Open the main gas valve.
9.
Vent the gas pipe.
10.
Open the gas cock in the gas pipe to the boiler
module and vent the gas pipe.
11.
Check the inlet gas pressure PI (see fig. 22).
12.
Check the gas connection for gas tightness.
13.
Switch on the mains supply to the boiler module.
14.
Switch on the boiler module operating switch.
15.
Switch on the heating pump (if this heating
pump is connected to the boiler module, it starts
automatically
in case of heat demand) and check the installa-
tion position and direction of rotation.
16.
Adjust the boiler controls to heat demand.
17.
The boiler module should start with the run
sequence indicated in the code-display:
See to it that the other
30
Remeha Gas 610 ECO
9.3 Gas/ air ratio control
Each boiler module has a pressure differential gas/ air
ratio control. This gas/ air ratio control maintains the cor-
rect balance of gas and air quantities to the burner at a
constant level under variable loads. This ensures clean
and reliable combustion and high part load efficiency
across the entire load range.
Minimum airflow is monitored before a start by an air
pressure differential sensor.
0 =
Boiler module neutral position.
5 =
Butterfly valve opens, if connected;
Wait for minimum gas pressure switch to close;
Neutral position check of air pressure differential sensor;
Flue gas damper opens (if applicable) as soon as the
fan turns 150 rpm;
The fan runs and the boiler module waits until sufficient
air transport is established; the air pressure differential
sensor must switch to guarantee sufficient airflow.
t =
Gas valve leak proving system (if applicable).
1 =
Pre-purging.
2 =
Heating pump starts running; Ignition of the gas/
air mixture.
3 =
The burner is firing.
17.a
Check and correct, if necessary, the boiler mod-
ule for correct gas/air ratio set-up. Checking
takes place on full and part load, adjustment
takes place only on the gas valve multiblock.
For checking and adjusting are required: an
electronical CO
-gauge (on the basis of O
2
a gas pressure gauge.
Note that the opening (see fig. 23) around the
measuring probe is sealed properly during
measurement.
Note also that measuring the O
flue gas is necessary, because direct measure-
ment of CO
can lead to inaccuracies due to
2
varying CO
levels in the natural gas.
2
Connect the gas pressure meter between meas-
uring point PG on the underside of the gas valve
multiblock and measuring point PL on the ven-
turi (see fig. 22), ensuring the connections are
gas tight.
) and
2
levels in the
2
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