Carlin 702GAS Inst Manual - Manual (Page 17)

Model 702GAS Advanced gas burners — Instruction manual
Carlin part number MN702G Rev. 03/14/11 – 17 –
Where appliance instructions differ from this manual, follow the appliance instructions.
Before firing the burner . . .
Set combustion head (Dimension “A”)
1. The combustion head adjusting screw is used to set the spacing between
the retention ring and throttle ring (or air cone), regulating how much air
passes around the retention ring.
2. See Figure 16. Loosen the two housing cover screws. Then rotate the head
adjusting screw until the distance from the housing detent to the beginning
of the scale equals the value given in Table 5 (Dimension “A” ). Tighten the
housing cover screws.
Set air damper (low fire position)
1. See Figure 17. Loosen the air damper adjusting screw and locknut. Rotate
the adjusting screw until the air opening between the damper and the
damper housing equals the initial low-fire opening in Table 5. Leave screw
and locknut loose until final adjustment.
Determining final adjustments
1. The burner is now adjusted to the approximate air settings for the fir-
ing rate used. Follow the procedures on the following pages to use test
instruments and make final burner adjustments.
Figure 17 Set initial low fire air damper setting
Figure 16 Set initial combustion head position
Table 5 Initial burner settings (see the pages 18 through 21 for final adjustments using test instruments)
Low-fire input High-fire input Combustion
head position
Dimension “A”
Air damper
low-fire
opening
Butterfly valve open –
low fire
(factory set) Natural gas Natural gas
MBH MBH
Inches
(approximately)
Inches
(approximately)
%
(approximately)
490 840 0 3/8 50
525 910 1/16 3/8 50
560 966 1/8 7/16 50
630 1092 3/16 7/16 50
700 1218 3/8 1/2 50
770 1330 5/8 1/2 50
840 1456 1-1/8 9/16 50
910 1600 1-3/8 9/16 50
6. Set burner initial head and damper positions
Follow the procedures given here and on the follow-
ing pages to ensure the burner is correctly adjusted.
Take your time and the adjustments given in the
following should result in good operation, and avoid
return service calls.
You must perform the adjustments in the sequence
given in this manual.
Failure to follow the correct procedures could result in
severe personal injury, death or substantial property
damage.