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1.9.2
Humidifier
Terminals are provided to direct 115 volts @ 1.0 Amp maximum
to the transformer powering the humidifier. The humidifier will be
energised anytime the blower is operating in the "Heating Mode".
Wire the 115-volt power as indicated in Figure 6.
1.9.3
Air conditioning
An air conditioning coil may be installed on the supply air side
only. Also, notwithstanding the evaporator coil manufacturer's
instructions, a minimum of 15 cm (6") clearance must be allowed
between the bottom of the coil drain pan and the top of the heat
exchanger. Wire the thermostat and condensing unit contactor as
indicated in Figure 6.
1.9.4
Ductwork and Filter
Installation
Design and install the air distribution system to comply with Air
Conditioning Contractors of America manuals or other approved
methods that conform to local and/or national codes and good
trade practices.
When furnace supply ducts carry air outside furnace area, seal
return air duct to furnace casing and terminate duct outside
furnace space.
Install air conditioning cooling coil (evaporator) on downstream
side from the supply air plenum of the furnace. If a separate
evaporator and blower unit is used, install appropriate sealing
dampers for air flow control. Cold air from the evaporator coil
going through the furnace could cause condensation and shorten
furnace life.
2.1
MANUAL OPERATION SWITCHES
FIGURE 3
DNS-0574 Rev. C
Dampers (purchased locally) MUST be automatic.
Poisonous carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or utility
room. Return air duct MUST be sealed to furnace
casing.
Failure to properly seal duct can result in death,
personal injury and/or property damage.
Poisonous carbon monoxide gas hazard.
Install evaporator coil on the supply side of the furnace
ducting.
Evaporator coil installed in return side ducting can
cause condensation to form inside heat exchanger
resulting in heat exchanger failure. This could result in
death, personal injury and/or property damage.
PART 2
OPERATION
2.2
SEQUENCE OF OPERATION
2.2.1
Sequence of operation - Beckett AFII
Side-wall venting
1.
On the Beckett AFII burner, the T-T terminals have to be
jumpered on the primary control of the burner;
2.
Normally open contact (W-R) on SPDT relay closes when
thermostat calls for heat;
3.
Burner motor starts and spark is established. The burner motor
fan pre-purges the combustion chamber and vent for 15 to 20
seconds, establishing the combustion air pattern;
4.
After the pre-purge period, solenoid valve opens allowing oil to
flow through nozzle;
5.
The ignition transformer spark ignites oil spray;
6.
Cad cell senses flame and burner continues to fire;
7.
After Fan-Limit Control heats up to the factory set point, the
circulating air blower starts;
8.
The circulating air blower, burner motor and ignition transformer
remain on until the thermostat is satisfied. Also, the solenoid
valve remains open;
Thermostat is satisfied:
9.
SPDT relay contacts open, solenoid valve closes, burner fan
motor post-purges the combustion chamber and vent for a pre-
set time (30 sec. to 4 min.). The ignition transformer also
continues to spark for this time period;
10. During the post-purge cycle, the Fan-Limit Control cools down to
the factory set point of 32°C (90°F) and the circulating air blower
turns off.
CAUTION
WARNING
WARNING
15
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