minutesduration.Theexhaustwillhavea pungentodor
andproduceawhitecloudofsteam.
3.4) Perform the smoke / CO2 test:
For chimney installations, pierce a test hole in the
smoke pipe near the furnace breech. For side-wall
vented installations, remove the threaded cap from
the extended test pipe that is welded into 4-bolt
breech plate. Insert the smoke test instrument
probe into the open hole.
2. Starting with a zero smoke reading, gradually
reduce the burner air setting until just a trace (#1 on
Bacharach Scale) of smoke results.
3. Take a CO2 sample at the same test location
where the smoke sample was taken. Note the CO2
reading associated with the #1 smoke condition.
4. For chimney vented installations, adjust the burner
air setting to obtain a CO2 reading 1% lower than
the reading associated with the #1 smoke.
5. For side-wall vented installations, adjust the burner
air setting to obtain a CO2 reading 1.5% lower than
the reading associated with the #1 smoke.
This method of adjusting the CO2 will allow
adequate excess air to ensure that the burner will
burn clean for the entire heating season, and will
ensure proper calibration of the DV-2000 TM blocked
intake/ vent safety shutdown system used in side-
wall venting applications.
3.5) Perform the supply air temperature
rise test:
1. Operate the burner for at least 10 minutes.
2. Measure the temperature of the air in the return air
plenum.
.
Measure the temperature of the air in the largest
trunk coming off the supply air plenum, just "out of
the line of sight" of the radiation coming off the heat
exchanger; 12" away from the plenum on the main
take-off usually satisfies this objective.
4. The temperature rise is calculated by subtracting
the return air temperature from the supply air
temperature.
.
22
If the temperature rise exceeds the temperature
specified in table #4.1 to #4.3, 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.
3.6) Fan limit adjustment:
FIGURE # 4
DNS-0355 Rev.B
1 Limit"FAN OFF" I 90OF
2 Limit"FAN ON"
Model : OLR160 110°F
Model : OUF105, OLF105, OLR105, 130UF
OUF160, NOUF105, NOLF105 &
NOUF160
3 Limit "HI"
Model: OLR160 170UF
Model: OUF105, OLF105, OLR105, 180OF
NOUF105 & NOLF105
Model: OUF160 & NOUF160 220UF
3.7) Vent temperature test:
1. Place a thermometer in the test hole located in the
breech pipe.
.
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.
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