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increase the air adjustment to adjust the CO
down into the range. If the CO
combustion is fouling, possibly due to a bad
nozzle or other improper burner adjustments and
the cause must be determined before proceeding
any further.
1.5)
Perform the supply air temperature
rise test :
a. Operate the burner for at least 10 minutes.
b. Measure the temperature of the air in the return
air plenum.
c. 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.
d. The temperature rise is calculated by subtracting
the return air temperature from the supply air
temperature.
e. If the temperature rise exceeds the value
specified in table # 4, change to the next higher
blower speed tap until the temperature rise
corresponds to the specifications or below. If the
excessive temperature rise cannot be reduced by
increasing fan speed, investigate for ductwork
restrictions (the static pressure should be less than
0.50" WC), dirty or improper air filter, or overfiring
caused by excessive pump pressure, or improper
nozzle sizing.
1.6)
Vent temperature test :
a. Place a thermometer in the test hole located in the
breech pipe.
b. 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.
1.7)
DV-2000™ Blocked intake / Blocked
vebt test :
a. The DV-2000™ venting system incorporates a
safety shutdown system that will shut the burner
down before a #1 smoke occurs due to the
presence of a blocked intake or blocked vent
outlet. Test the system as follows:
b. Ensure that the furnace has been running for at
least 10 minutes.
c. Gradually block the intake. The burner flame
should shut down before a #1 smoke reading
occurs.
d. Gradually block the vent outlet. The burner flame
should shut down before a #1 smoke reading
occurs.
2
is below the range,
2
e. If the burner does not shut down before a #1
smoke occurs, ensure that the burner is set up
according to Section 9.,Starting the Burner.
Perform the CO
Smoke Test, and allow the 1.5%
2
CO
operating
headroom
2
instructions.
f.
If the burner still does not shut down before a #1
smoke occurs, check for blockage of the pressure
hose, or at the hose connection points.
IMPORTANT:
The
shutdown system will act to shut down the
burner flame during a blocked intake or
blocked vent condition if and only if the
burner has been set up and calibrated in
accordance with table # 4. Perform the CO
Smoke Test.
For instance, if the burner
adjusted and final-set to a #1 smoke
condition during normal operation, the burner
flame can't possibly shut down before a #1
smoke occurs during a blockage condition.
1.8)
Fan limit adjustment:
FIGURE # 4
DNS-0355 Rev.B
1 Limit "FAN OFF"
2 Limit "FAN ON"
3 Limit "HI"
required
by
the
DV-2000™
safety
2
90ºF
130ºF
200ºF
19
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