Specifications

IM 685-2 7
accessible from outside the unit, that valve must be relocated
or an additional valve added. In locating such a valve, it is to
be readily accessible and located such that no obstructions
interfere with operation of the handle.
Condensate Drain
All units are equipped with a 3/4" I.P. condensate drain pipe
projecting from the back side of the furnace section (see Figure
13 and Figure 14) and the flue box corners (see Figure 1). If
applicable codes or regulations require, this can be routed to a
drain. A trap is not recommended and heat tape or some other
method of freeze protection is required.
Vestibule (Models 150 thru 200)
These two furnace sizes exceed the allowable shipping width
and for this reason the burner is disconnected and removed for
shipment. A sheet metal vestibule weather enclosure is also
disassembled for shipment. At installation the burner must be
re-mounted, the tagged electrical connections re-attached, and
the vestibule re-assembled and mounted as shown in Figure 5.
These items are packed in a crate and shipped as a separate
item.
Gas Piping (Models 150 thru 200)
The gas piping cannot be routed up to the burner from
within the curb on Models 150 through 200. Gas piping
must be routed across the roof to under the burner vesti-
bule, or a pitch pocket can be provided there. The installer
must cut a hole in the bottom panel of the overhanging
burner vestibule through which to route the gas line up to
the burner gas train. The bottom panel of the vestibule is
at approximately the same elevation as the top of the curb.
Gas Piping within the Vestibule
The gas piping layout within the vestibule will vary
according to the complexity and size of the gas train rela-
tive to the available room within the vestibule. As an
example, a gas train with a high pressure regulator and an
extra safety shutoff valve (when required for IRI, etc.) will
require careful use of the available space. The examples
shown in Figure 4 indicate typical piping layouts.
Field Gas Piping Required
The gas train components have all been factory installed
and require only a connection to the supply gas line. The
manual shutoff valve is located within the burner vesti-
bule. If local codes require a manual shutoff valve that is
Figure 5. Vestibule
Cut Gas Line Opening
Hinge
Side Panel
Door
Top Panel
Side Panel,
With Latch
Bottom Panel
#10 Screw
Door
Fasten Wind Deflector
To Door With #10 Screws,
(Door & Wind Defletor
Part of Vestibule Kit)