Roberts Gorden Combat MGB0100, Руководство по установке

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SECTION 10: C
OMMISSIONING
43 of 85
Fi g ure 1 8 : Gas-Fired Heater Control Box Se q uence
10.3 Commissionin g the Two-Sta g e (Hi g h/Low)
Burner ( g as heaters)
High/Lo w b u rners ha v e additional specific
req u irements. Follo w the b u rner man u fact u rer's
instr u ctions and the data pro v ided on Page 11,
Section 4.4 through Page 14, Section 4.8 .
10.3.1 Set Gas Rate
1. S w itch off and refit the main gas v al v e pl u g
(remo v ed earlier to allo w the main gas v al v e to
operate).
2. S w itch on again and allo w the b u rner to fire and
to settle for a fe w min u tes.
3. Adj u st the main gas b u rner press u re to the
v al u e gi v en in the rele v ant Data Table for the
model concerned u sing the Main Gas Reg u la-
tor (accessed u nder the s w i v el co v er).
The res u lts of setting the gas flo w rate by u sing
b u rner press u re only can lead to q u ite w ide
v ariations in heat inp u t d u e to the nat u re of the
b u rners u sed.
NOTE: If the correct b u rner press u re cannot be
reached, then check the inlet press u re to the v al v e,
w ith the b u rner firing. See Technical Data Tables on
Page 11, Section 4.5 for inlet press u re req u irements.
Do not continue to adjust the re g ulator if the
pressure is not chan g in g .
If the inlet press u re is too lo w to allo w the correct
b u rner press u re setting, then the gas inlet press u re
m u st be corrected before completing the
commissioning.
10.3.2 Check Gas Rate
It is important to check that the gas rate set d u ring
the commissioning is w ithin ± 5% of the req u ired
flo w rate.
This may be achie v ed by checking the gas flo w to
the heater w here v er possible by u sing the gas meter
and timing the flo w thro u gh the meter. The res u lts
sho u ld be compared w ith the req u ired flo w rate for
the model gi v en in the Data Tables, adj u sting the
b u rner press u re to correct for any error. Checking
the gas rate m u st be carried o u t w ith all other
appliances incl u ding any pilots, t u rned off.
1. After b u rner press u re adj u stment, allo w the
heater to operate for at least 15 min u tes and
then re-check settings.
2. Remo v e the manometer and refit all co v ers to
the v al v e and tighten the scre w of the o u tlet
press u re tap.
3. Check gas flo w rate at gas meter.
10.3.3 Control - Gas-Fired Heaters
For High/Lo w , follo w the general seq u ence as
described belo w and also ha v e extra f u nctional
stages related to air damper positions. Refer to the
b
u rner man u fact u rers instr u ctions for f u rther detail.
Gas b u rners ha v e t w o press u re s w itches; One is
config u red to co v er comb u stion air and reaction to
increases in comb u stion chamber press u re. The
second press u re s w itch is u sed for monitoring
incoming gas s u pply press u re.
10.3.4 Description of Gas-Fired Heater Control
The gas-fired b u rner fitted to all cabinet heaters is
controlled by a f u ll seq u ence pl u g-in control. This
Al w ays disconnect the po w er s u pply before installing or remo v ing the control u nit. Do not
attempt to open or carry o u t repairs on the control u nit.