DF Series installation manual
17
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PILOT ADJUSTMENT
a.
The pilot is adjusted at the factory. It can also be adjusted on site by a qualified
technician following start-up instructions.
b.
When adjusting the pilot gas pressure with the regulator, the main burner
should not be in operation (close the main burner gas manual valve).
c.
Adjust the pilot regulator to obtain a good reading of the flame signal on the
flame safeguard control (5-10 VDC for FIREYE and 3-5 VDC for HONEYWELL).
•
BURNER ADJUSTMENT: « HIGH FIRE »
a.
Set the maximum capacity of the burner according to the desired maximum
temperature rise required.
Example of calculation of the maximum temperature rise:
Minimum outside temperature: -20°F (-29°C)
Desired final temperature: 70°F (21°C)
Temperature rise
(ΔT): 90
°F (50°C)
b.
When the outside temperature does not allow for the simulation of the
specified temperature rise across the burner, adjust its maximum capacity
according to the required gas pressure indicated on the name plate of the unit.
Readjustment will be required when outside air temperature permits full fire.
c.
The adjustment is made using the main burner pressure regulator (Figure 3).
For units with a capacity over 1000 MBH, use the regulator included in the
MAXITROL modulating valve (see MAXITROL service manual) (Figure 4).
NOTE:
Turn the adjustment screw clockwise to increase the gas pressure to the
burner.
Turn the adjustment screw counter clockwise to reduce the gas pressure to
the burner.
With the Maxitrol series 14 device, simply disconnect terminal 4 to obtain
the maximum burner capacity.
Figure 3
Figure 4
Regulator
