Blocked Intake/Blocked Vent Test (Vtk); Bvso Performance Test; Maintenance; Preventive Maintenance - Dettson OLR105A12D Mode D'emploi

Figure 3 :
1 "FAN OFF" Limit
"FAN ON" Limit
Model : OLR160
2
Model : OUF105, OLF105, OLR105,
OUF160, NOUF105 &NOLF105
"HI'' Limit
Model : OLR160
3
Model : OUF105, OLF105, OLR105,
NOUF105 & NOLF105
Model : OUF160
3.3.10

Blocked intake/blocked vent test (VTK)

On side-wall vented furnaces, the VTK venting system
incorporates a safety shutdown system that will shut the
burner down before #1 smoke occurs due to the presence of
a blocked intake or blocked vent outlet. Test the system as
follows:
1. Ensure that the furnace has been running for at least 10
minutes;
2. Gradually block the intake. The burner flame should
shut down before a #1 smoke reading occurs;
3. Gradually block the vent outlet. The burner flame should
shut down before a #1 smoke reading occurs;
4. If the burner does not shut down before a #1 smoke
occurs, ensure that the burner is set up according to
Part 2, section 3.4 (2.3.4). Perform the CO
Test, and allow for the 1.5% CO
required by the instructions;
5. If the burner still does not shut down before a #1 smoke
occurs, check for a blockage of the pressure hose, or at
the hose connection points.
IMPORTANT
The VTK safety shutdown system will 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 Tables 3 or 5. Perform the CO
Test. For instance, if the burner is adjusted and final-set to a
#1 smoke condition during normal operation, the burner
flame cannot possibly shut down before #1 smoke occurs
during a blockage condition.
Fan-limit
DNS-0355 Rev.B
90°F
110°F
130°F
170°F
180°F
220°F
/ Smoke
2
operating play
2
/ Smoke
2
3.3.11

BVSO performance test

The purpose of the following test is to check that the
electrical outlet on the furnace, designated to the BVSO, is
functional.
1. Start up the burner;
2. Remove the three-pole plug from the BVSO outlet on
the furnace;
3. The burner must shut-off immediately, while the
blower continues to run to the end of the cool-down
cycle.
If the test is not in line with the above, call a QUALIFIED
SERVICE TECHNICIAN.
4.0

MAINTENANCE

4.1

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 technician.
A complete combustion test must be performed after each
annual service inspection of the unit, to maintain optimum
performance and reliability.
Do not tamper with the unit or controls. Call a qualified
service technician.
ELECTRICAL SHOCK HAZARD.
Turn OFF power to furnace before any disassembly or
servicing.
Failure to do so can result in bodily injury and/or death,
property damage.
Before calling for service, check the following :
a. Check oil tank gauge and check if the valve is open;
b. Check fuse or circuit breaker;
c. Check if shut-off switch is "ON";
d. Set thermostat above room temperature;
e. If ignition does not occur, turn off the disconnect switch
and call a qualified service technician.
Note: When ordering replacement parts, specify the
complete furnace model and serial number.
4.2

HEAT EXCHANGER

The entire heat exchanger should be inspected annually for
soot accumulation. If the burner is operating normally there
should be very little soot accumulation. If the heat
exchanger requires scale removal, use a wire brush first, to
loosen the scale and then vacuum the soot and scale that
has fallen into the secondary heat exchanger (radiator)
section. You will find that a 36" long flexible hose attachment
will be helpful to reach into the back of the radiator. A piece
of 1/2" flexible gas connector, or a piece of 1/2" liquid-tight
vinyl jacket metallic electrical conduit works well as a
makeshift device.
12
CAUTION
WARNING