Installation / Operation Instruction Manual

Page 74
8.J Adjusting CO
2
These units use 3 di󰀨erent gas valves depending
on the the size of the model. All of them have
a Hi-Fire and Low-Fire adjustment.
See page 74 for models 150-285,
See page 75 for models 399-500, and
See page 76 for models 600-850.
The Gas Valve in the 150 thru 285 is at the front
of the unit and can be reached after the front
panel is pulled forward and then o󰀨.
Always be patient with your combustion analyzer
when making adjustments to the valve at both
Hi-Fire and Low-Fire.
Be sure to put the cap back onto the valve when
you are done making your adjustments at the
gas valve.
under
cap
Figure 45. Gas Valve 80 - 285 Mbtu
GAS TYPE HIGH FIRE, CO
2
LOW FIRE, CO
2
DIFFRNTL PRESSURE
(inches wc)
Natural 8.8 to 9.8% 0.5% lower than
3.6” to 3.9”
Propane 9.8 to 10.2%
high re setting
Table 18. Residential, sizes 150 - 285 Mbtu
CO
2
Range and Di󰀨erential Pressure
150–285
Gas Pressure Tap
B RADFORD W HITE