Roberts Gorden Combat HF 30 v4, Инструкция по установке, пусконаладке, обслуживанию и эксплуатации

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Page 43
CABINET HEATER
5.3.4 Fire the Burner for Dungs Combination Gas Valves
Open the gas isolating valve.
Connect a suitable pressure gauge to the burner pressure test point.
On models 040 or larger, to ensure that start gas only may pass to the burner, remove the gas valve electrical plug for
main gas valve. Reset the lockout button of the control box and carry out operation 5.3.4 again. The burner should now
fire. If lockout should occur when the start gas valve energises (or main gas valve for models up to 030), repeat 3 or 4
times.
If after several attempts, the burner does not fire then turn the start gas governor adjusting screw (or main gas governor
for models 015 to 030) 3 turns clockwise (see 5.3.6 below) and repeat until the burner fires.
5.3.5 Initial Setting
Note: Miss out this stage for models 015 to 030
Once firing, the start gas pressure should be set to the value given in the Data Tables for the burner type and the
model concerned (see burner reference letter on data plate). This is carried out by turning the governor adjusting screw
(accessed under the screw on cover) clockwise to increase pressure, or vice versa.
5.3.6 Set Gas Rate
Switch off and refit the main gas valve plug, removed earlier to allow the main gas valve to operate. Switch on again
and allow the burner fire and to settle for a few minutes. Adjust the main gas burner pressure to the value given in the
relevant Data Table for the model concerned using the Main Gas Regulator accessed under the swivel cover (see Figs
2.6 & 2.7).
The results of setting the gas flow rate by using burner pressure only can lead to quite wide variations in heat input due
to the nature of the burners used.
It is important to check that the gas rate set during the commissioning is within ± 5% of the required flow rate.
This may be achieved by wherever possible checking the gas flow to the heater by using the gas meter and timing the
flow through the meter. The results should be compared with the required flow rate for the model given in the Data
Tables, adjusting the burner pressure to correct for any error.
Note: This must be carried out with all other appliances turned off, including any pilots.
5.3.7 Set Combustion Air - All Gas Valve Types
The combustion air must now be set. This is carried out by measuring the emissions in the flue at a point within one
metre of the outlet from the heater and adjusting for the highest concentrations of carbon dioxide (CO
2
) obtainable,
usually 9.5% to 10% for natural gas and 11% for L.P.G. whilst making little or no carbon monoxide (CO); 10 parts per
million (0.001%) is the maximum recommended. These tests should be carried out with all covers and panels fitted.
To adjust for these results:
Closing the combustion air damper will increase these values.
Opening the damper will reduce these values.
Once adjusted to the optimum combustion setting ensure that the combustion air damper is locked into position (see
Burner Manufacturer's Instructions).
Due to the interaction between combustion air and burner gas pressure it is now advisable to repeat from 5.3.6.