0503RHC8RJLGBEN
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Table 5 :
Models High/Low burner gas pressures and low rate consumption values
1
Natural gas G20 gross calorific value 10.48 kWh/m³ at 15°C & 1013 mbar
Propane gas G31 gross calorific value 14.0 kWh/kg
Low fire rate must not be reduced below the values stated above for 30% rating.
Note
:
Burner pressures for butane/propane gasses are approximate based on regulated supply pressure :
Calculation burner pressure : burner pressure at 100% input x (load)²
Example 1: type 8100 12, 50%, nat. gas G20: 6,9mbar x 0,5² = 1,72mbar
≈
1,7mbar
Example 2: type 8050 06, 75%, prop.gas G31: 35,5 mbar x 0,75² = 19,97mbar
≈
20mbar
P.S. : for the 8000M models the gas pressures for high/low rates are given for individual units each. In some cases it is possible to obtain 2 stage
operation by switching on and of the top unit of these 8100M models.
5.7.2 Modureg V7335A 2000 series modulation system
The Modureg V7335A 2000 Series Modulating gas pressure
regulators are an optional addition which can be used on
"Honeywell" Multifunctional gas controls for modulating the
burner gas pressure for firing over the range 50% to 100% of
the nominal high fire burner rate. Two model types are used
dependant on the gas type. They are identified Grey cover =
Natural gas, outlet pressure range 1,5 - 20,0 mbar. Yellow
cover = Propane/Butane gas, outlet pressure range 4,0 -
37,0 mbar
Caution:
Reznor air heaters must be controlled so that burner start-up
takes place in the high fire (100%) mode.
Modureg gas pressure regulators require to be powered by a
maximum 24 V DC voltage over the range 15 - 165 mA
maximum. Maximum outlet pressure occurs at the high set
point value (high fire). Minimum outlet pressure occurs at low
set point value (low fire). The power signal may be obtained
from a system amplifier which may be an integral control
within the appliance or from a remote control system
designed to provide the required controlling voltages.
Adjusting the V7335A Regulator
Refer to figure 9.
To check the minimum or low fire and maximum or high fire
pressures for limits of modulation use the following
procedures.
Fit a manometer to appliance burner pressure test point.
Important
:
Allow time for gas pressure to stabilise before making
adjustments.
8030 06 8045 09 8050 06 8060 12 8075 09 8075 15
8090 18
8100 12
8125M ,15
8150M ,18
8175M ,21 8200M ,24
nat gas
G20
mbar
6,90
6,90
6,90
6,90
6,90
6,77
7,26
6,90
7,10
7,30
7,70
7,70
prop
G31
mbar
36,50
35,70
34,90
35,50
34,50
35,20
33,30
33,30
35,40
34,80
34,70
33,70
nat gas
G20
mbar
1,70
1,70
1,70
1,70
1,70
1,69
1,82
1,70
1,78
1,83
1,93
1,93
prop
G31
mbar
8,90
8,90
8,90
8,90
8,70
8,88
8,65
8,30
8,85
8,70
8,68
8,43
nat gas
G20
mbar
0,62
0,62
0,62
0,62
0,62
0,62
prop
G31
mbar
3,20
3,20
3,20
3,20
3,14
3,00
nat gas
G20
m3/h
1,76
2,67
3,95
3,55
4,41
8,72
10,48
5,72
NA
NA
NA
NA
prop
G31
kg/h
1,32
2,00
2,21
2,66
3,30
6,43
7,72
4,28
NA
NA
NA
NA
Gas
consumption
at 50% (1)
Ref. 15°C,
1013mb
RHC 8000 DJL
Burner
pressure
at 100%
Burner
pressure
at 50%
Burner
pressure
at 30%