Dettson LOW-BOY AMT Serie Guide D'installation Et Manuel Du Propriétaire page 34

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2.12.3
IR ONDITIONER
An air conditioning coil may be installed on the supply air side
ONLY.
WARNING
Poisonous carbon monoxide gas hazard.
Install the evaporator coil on the supply side of the
furnace ducting ONLY.
An evaporator coil installed on the return air side of the
ducting can cause condensation to form inside the heat
exchanger, resulting in heat exchanger failure. This in
turn, can result in death, bodily injury and/or property
damage.
A clearance of 15 cm (6") is required between the bottom of
the coil drain pan and the top of the heat exchanger. If a heat
pump is installed, a "dual-energy" thermostat, or other control
is recommended, in order to prevent the simultaneous
operation of the furnace and the heat pump. It also prevents a
direct transition from heating by way of the heat pump to
heating with oil. Refer to the thermostat instructions or those of
another control used for the proper wiring.
If a coil blower compartment is used, install air tight, motorized
and automatic air dampers. Cold air coming from the coil and
passing across the furnace can cause condensation and
shorten the life of the heat exchanger.
3 OPERATION
3.1 START-UP
Before starting up the unit, be sure to check that the following
items are in compliance:
The electrical installation, the oil supply system, the
1.
venting system, combustion air supply and ventilation;
The blower access door is in place and the blower rail
2.
locking screws are well tightened;
The Blocked Vent Shut-Off (BVSO) is installed according
3.
to instructions (for chimney venting);
The oil supply valve is open;
4.
The burner ''Reset'' button is well pushed in or re-armed;
5.
The preliminary air adjustments on the burner comply with
6.
the technical specifications in this manual;
The blower speed adjustments for heating and air
7.
conditioning are appropriate and according to the
specifications in this manual;
The blower start/stop delays are satisfactory;
8.
The thermostat of the room is in the heating mode and is
9.
set higher than the ambient temperature.
To start the unit, turn the main electrical switch on. operating
sequence oil heating mode
3.2 OPERATING SEQUENCE OIL HEATING
MODE
1. The W-R contact closes;
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2. The burner motor starts up to pre-purge the
combustion chamber for a period of 10 to 15
seconds. During that time a spark is established on
the electrodes;
3. The solenoid valve opens and a flame is established.
Shortly after, the electrodes cease to spark;
4. Then the blower runs up to full speed. The delay
depends on the adjustments that were made on the
electronic board, which controls the blower motor.
Refer to Sections 2.11 and 2.12, as well as the CFM
table for more details.
5. When the call for heat is satisfied, the solenoid valve
closes, the flame goes out and the burner motor
stops (after post purge delay, if applicable).
6. The blower stops shortly after the burner. The delay
depends on the adjustments that were made on the
electronic board that controls the blower. Refer to
Sections 2.11 and 2.12, as well as the CFM table for
more details.
Note: A detailed operating sequence of the oil burner is
outlined in the instructions provided with the burner.
3.3 CHECKS AND ADJUSTMENTS
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3.3.1
URGING THE OIL LINE
Open the bleed port screw and start the burner. Allow the
oil to drain into a container for at least 10 seconds. The oil
should flow absolutely free of white streaks or air bubbles
to indicate that no air is being drawn into the suction side
of the oil piping and pump. Slowly close and tighten the
bleed screw. Once closed, the flame will light up.
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3.3.2
RESSURE ADJUSTMENT
The oil pressure must be adjusted according to the
Technical Specifications of this manual. An adjustment
screw and a connection for a pressure gauge are located
on the oil pump for that purpose. Also refer to the burner
instruction manual.
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3.3.3
OMBUSTION
IMPORTANT
The heat exchanger metal surfaces may have oil and the
baffle insulation also contains binders. These products will
burn or evaporate when the unit operates for the first time.
Because of that, the smoke reading may be skewed
during the first minutes of operation. Therefore, the unit
must operate during at least 60 minutes before taking any
readings to adjust the combustion quality. Let the unit cool
down before making any adjustments.
IMPORTANT
The combustion check verification MUST be performed
after the nozzle replacement or the burner cleaning. After
these manipulations, the combustion parameters are
necessarily modified. Refer also to the burner instruction
manual.
Pierce a test hole in the flue pipe, approximately 18
1.
inches from the furnace breech. Insert the smoke test
probe into the hole. For installation using a sidewall
venting, use the orifice provided on the breech plate;
9
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HECK