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All installations and services must be performed by qualified service personnel.

The Field vent kit is set up with 4 inch diameter vent pipe with concentric through-the-wall vent termination/inlet air
vent hood. The combustion air inlet pipe diameter is also 4 inch diameter. For Beckett, the combustion air inlet pipe
will be reduced to 3” diameter with the Beckett side wall vent kit.

The side wall vent may be installed either through the upper knock-out on the left side casing of the unit or vertically
out the top opening of the vestibule. The 4” flexible vent pipe included w/ Field vent kit is able to be installed at 2”
clearance to combustibles.

The combustion air inlet can be installed through the either the lower left side casing knock-out or the lower right
side casing knock-out.

B. DRAFT REGULATORS:

A draft regulator is supplied with the furnace and should be installed according to the regulator manufacturers
recommendations. With the burner operating, use a draft gauge to adjust the regulator to the proper setting. (refer to
the instructions enclosed with draft regulator to adjust to the proper setting). When the burner air supply and draft are
properly adjusted, the overfire draft should be a negative (-).01" to (-).02" WC

, as measured at the 5/16" overfire

air tap (See Fig. 4). This tap is provided in the upper burner mounting plate. To measure the flue draft, punch a small
hole in the vent connector pipe as close to the furnace as possible and always before the draft regulator.

Note:

1. Draft overfire may be positive for high fire applications but not to exceed (+).02" WC.

C.  DUCT WORK/AIR CONDITIONING/SUPPLY/RETURN AIRFLOW AND AIR TEMPERATURE:

If the furnace is used in connection with summer air conditioning (cooling), the furnace should be installed parallel
with  or  on  the  upstream  side  of  the  evaporator  coil  to  avoid  condensation  in  the  furnace  heat  exchanger.  If  the
cooling unit is installed with a parallel flow arrangement, dampers or other means used to control flow of air should
be  provided  to  prevent  chilled  air  from  entering  the  furnace.  If  such  a  damper  is  manually  operated,  it  must  be
equipped with a means to prevent operation of either unit, unless the damper is in the full heat or cool position.

The  supply/return  airflow  shall  be  set  to  obtain  an  air  temperature  rise,  across  the  furnace,  in  the  range  of  55º  to
85ºF.  Since  the  flow  resistance  of  each  duct  system  is  slightly  different,  the  airflow  (fan  speed)  may  have  to  be
changed in the field to achieve a satisfactory temperature rise.

One  way  to  measure  the  temperature  rise  across  the  furnace  is  to  insert  temperature  measuring  devices  (e.g.
thermometers) into the return air duct and into the supply air duct about 12 inches from the furnace. After the furnace
has been firing continually for over 20 minutes, read the temperature difference between the two (2) thermometers.
The temperature difference should not exceed 85ºF, nor be less than 55ºF. A temperature rise of 70ºF is considered
to be optimum for comfort.

The  blower  (fan)  speed  fan  is  adjusted  by  changing  the  fan  motor  winding  energized  by  the  control  system.  The
furnace is set on fan speed, “ML”, at the factory, refer to page 13 of this manual. To adjust the fan speed, change
corresponding wire from the appropriate fan speed to the “HEAT” tap on the control.