Rapid 7500 136, Инструкция по установке, эксплуатации и обслуживанию

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7500-S
ERIES
I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
110 of 143
9. Replace the w iring compartment co v er.
To adj u st lo w fire on a f u lly-mod u lating bu rner, the
bu tterfly metering v al v e controls the adj u stment
means. See Page 110, Figure 88 and Figure 89 .
There are t w o types of bu tterfly metering v al v es u sed
on these air t u rno v er u nits; the first determines the
lo w fire position b y linkage adj u stment only, the
second has an act u al stop scre w w hich controls the
flo w of gas for lo w fire. In each case, the lo w fire flo w
is adj u sted to the smallest flo w possi b le w hile still
achie v ing the b est com bu stion res u lts. See Page
112, Section 16.9 , Step 10 for adj u stment
information.
FIGURE 88 : Low Fire Adjustment for Fully-Modu-
latin g Burner with Linka g e Adjustment
FIGURE 8 9: Low Fire Adjustment for Fully-Modu-
latin g Burner with Stop Screw Adjustment
16. 8 Oil Pressure Adjustments
All adj u stments, for all bu rner types - on/off, high/lo w /
off and f u lly-mod u lating are accomplished b y
adj u sting the oil p u mp press u re settings. Refer to the
p u mp man u fact u rer's bu lletin packed w ith the bu rner.
16. 8 .1 Oil Pressure Adjustments for On/Off
Burner
The on-off system u ses a single stage, high s u ction
lift oil p u mp w ith a simplex oil nozzle. The nozzle oil
flo w rate is set b y adj u sting the oil p u mp press u re
reg u lating v al v e. T u rn clock w ise to increase the
press u re and co u nter-clock w ise to decrease the
press u re to the nozzle. Normal nozzle press u re w ill
b e 100 to 300 PSI (6894 - 20684 m b ar). Refer to the
bu rner's man u fact u rer's man u al packed w ith the
bu rner to determine specific nozzle press u res and
firing rates. Nozzle press u res are taken at the nozzle
press u re ga u ge port. The oil on-off flo w to the nozzle
is controlled b y the oil solenoid v al v e. The
com bu stion air dampers are adj u sted and locked in
place w ith the air damper arms. The bu rner operates
at one fixed firing rate.
FIGURE 90: Oil Pressure Adjustments for On/Off
Burner
16. 8 .2 Oil Pressure Adjustments for Hi g h/Low Off
Burner with Suntec Pump
This lo w -high-off system u ses a t w o-step oil p u mp
w ith a simplex oil nozzle in conj u nction w ith mo v a b le
com bu stion air dampers to pro v ide a lo w fire start
and a high fire r u n seq u ence. Nozzle flo w rate
press u re is taken at the 1/8" pl u gged p u mp press u re
ga u ge port. The lo w fire oil rate is set b y adj u sting the
oil p u mp lo w press u re reg u lator. The high fire oil flo w
rate is set b y adj u sting the oil p u mp high press u re
reg u lator. For b oth high and lo w fires, t u rn the
adj u stment scre w s clock w ise to increase the
press u re and co u nterclock w ise to decrease the
press u re to the nozzle. Approximate lo w fire oil
press u res are 100 to 125 psig (6894 - 8618 m b ar)
and high fire, 200 to 300 psig (13789 - 20684 m b ar).
Both settings w ill v ary depending u pon the specific
nozzle size selected and jo b conditions. Refer to the
bu rner's man u fact u rer's man u al packed w ith the