Install Instructions

40
WARNING
Failure to properly adjust gas input rate will result
        
Improper and unsafe boiler operation may result.
4. Determine Input Rate. Multiply gas ow rate by gas
heating value.
5. Compare measured input rate to input rate stated on
rating plate.
a. Boiler must not be over red. Reduce input rate
by decreasing manifold pressure. Do not reduce
more than 0.3 inch w.c. If boiler is still overred,
contact your U.S. Boiler distributor or Regional
Ofce for replacement Gas Orice.
b. Increase input rate if less than 98% of rating
plate input. Increase manifold gas pressure no
more than 0.3 inch w.c. If measured input rate is
still less than 98% of rated input:
 (continued)
i. Remove Main Burners per procedure in
Section XI: Service.
ii. Remove gas orices. Drill one (1) drill size
larger (drill size is stamped on orice, or see
Section XII: Repair Parts).
iii. Reinstall gas orices and main burners.
Measure input rate.
6. Recheck Main Burner Flame.
7. Return other gas-red appliances to previous
conditions of use.
O. Review User’s Information Manual and system
operation with owner or operator.