10
4. The temperature rise is calculated by subtracting the return air
temperature from the supply air temperature.
5. If the temperature rise exceeds the temperature specified in table
# 3.1 to # 3.5, change to the next higher blower speed tap until
the temperature rise falls to at this temperature or below. If the
excessive temperature rise cannot be reduced by increasing fan
speed, investigate for ductwork restriction(s), dirty or improper air
filter, or overfiring caused by excessive pump pressure, or
inproper nozzle sizing.
2.6) Vent temperature test:
1. Place a thermometer in the test hole located in the breech pipe.
2. The vent temperature should be between 400 and 575°F. If
not, check for improper air temperature rise, pump pressure,
nozzle size, or for a badly sooted heat exchanger.
2.7) Fan limit adjustment:
FIGURE # 2
MBO, MBOV
1 Limit “FAN OFF” 90
0
F
2 Limit “FAN ON” 110
0
F
3 Limit “HI” 200
0
F
LBO & OLR
1 Limit “FAN OFF” 90
0
F
2 Limit “FAN ON” 120
0
F
3 Limit “HI”
Model: LBO125 190
0
F
Model: LBO145-12 180
0
F
Models: LBO145-34 and OLR182 190
0
F
FLO & OLF
1 Limit “FAN OFF” 90
0
F
2 Limit “FAN ON” 110
0
F
3 Limit “HI” 150
0
F
PART 3
MAINTENANCE
1) GENERAL
Preventive Maintenance:
“Preventive maintenance” is the best way to avoid unnecessary
expense and inconvenience. Have your heating system and
burner inspected at regular intervals by a qualified service man.
After inspection, a complete combustion test must be performed after
each annual service of the unit to maintain optimum performance and
reliability.
WARNINGWARNING
Electrical shock hazard.
Turn OFF power to furnace before any disassembly
or servicing.
Failure to do so can result in property damage,
bodily injury and/or death.
DNS-0355 Rev.B
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