035-17473-000-B-1101
Unitary Products Group
7
The flue pipe must not be routed through concealed
space, because it must be visually checked for signs of
deterioration during the annual inspection and servic-
ing. The flue pipe must not pass through any floor or
ceiling, but may pass through a wall where suitable fire
protection provisions have been installed. Refer to the
latest edition of CAN/CSA B-139 for rules governing
the installation of oil burning equipment. In the United
States, refer to the latest edition of NFPA 31 for regula-
tions governing the installation of oil burning equip-
ment.
BAROMETRIC DAMPER CONTROL
This device is used in conjunction with conventional
chimney venting. This control (or draft regulator) auto-
matically maintains a constant negative pressure in the
furnace to obtain maximum efficiency. It ensures that
proper pressures are not exceeded. If the chimney
does not develop sufficient draft, the draft control can-
not function properly. The draft regulator, must be
installed within the same room or enclosure as the fur-
nace, and should not interfere with the combustion air
supplied to the burner. The control should be located a
minimum of 3 flue pipe diameters (18”) from the fur-
nace breaching and installed in accordance to the
instructions supplied with the regulator. The flue outlet
pressure (measured between the furnace and draft
regulator) should be set to - 0.02 in. w.c.
FURNACE CONTROLS
The furnace is controlled by the ST9103 ELECTRONIC
FAN TIMER (EFT) combined with an R7184 Oil Pri-
mary Control.
These controls provide for add-on air conditioning. The
ST9103 EFT is located in a control box mounted to the
blower support rails. The R7184 primary control
mounts to a 4x4 junction box connected to the oil
burner, contains the safety circuits and provides input
voltage for the separately mounted ignition transformer
on top of the oil burner.
The circulating fan is controlled by the ST9103 EFT.
The heat delay-on time is fixed at 30 seconds. This
provides a delay between the start of the burner and
the start of the circulating fan to reduce the amount of
ambient unheated air flowing through the ductwork.
The end of the circulating fan cycle is also delayed to
remove residual heat from the furnace. There are four
delay-off choices, 60, 90, 120 and 150 seconds, which
are field adjustable by manipulating the DIP switches
on the ST9103 EFT Board.
The cooling delay-on and delay-off times are fixed at
30 seconds each.
The furnace is protected against over-heating by fixed
high temperature limits. These controls are factory set
and are not field adjustable. If an over temperature
condition is detected, one or both limit switches will
interrupt power to the oil primary control, which will shut
off the oil burner. The circulating fan will continue to
operate. The high limit switches will automatically reset
when the furnace returns to a safe temperature.
The furnace must be connected to a flue having suffi-
cient draft at all times to ensure safe and proper oper-
ation of the appliance.
CAUTION
FIGURE 3 : R7184 OIL PRIMARY CONTROL
FIGURE 4 :
ST9103 EFT
