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An extension is included with the gravity vent cap with all PACK series 300, 350 and 400
units. Dimension
H is 12 inches (305mm) for propane gas series 300, 350 and 400 for
natural gas series 300 and 350. Dimension
H is 7 inches (184mm) for natural gas series
400. Contact factory if extension is increased above 12". Install the extension between the
gravity vent cap and furnace cabinet top as follows:
(a) Wrap the extension around the flange on the furnace top with
(9.53mm) centerline
at the bottom.
(b) Mark three mounting screw locations 120
o
apart on the (9.53mm) centerline,
center punch and drill with a #30 drill. Secure with No. 10 x
sheet metal screws.
(c) Push the cap all the way into the extension, keeping the solid side panel facing the
control access door.
(d) Mark, center punch and drill three mounting screw holes on the 2" (50.8mm)
centerline as described in b above.
GAS INSTALLATION:
Installation must be made in accordance with the requirements of the authorities having jurisdiction.
Pressure test gas supply piping before connecting furnaces. Each furnace will require a separate
piping connection. Where the PACK unit is installed with external vibration isolation, the gas supply
line(s) should be equipped with flexible gas connections, where permitted by local codes. Each
furnace is equipped with a manual shut valve factory installed inside the furnace access panel. An
addition manual shut off valve external to the furnace may be required by code. (See Fig. 3 and 4).
On all furnaces, install the gas supply pipe so that when the union is disconnected the burner tray
may be slid outward without interference.
External manual shut off valves, unions, nipples, elbows and pipe (shown shaded in Fig. 4) are by
installer.
A) NATURAL GAS (See Name Plate)
All furnaces of Engineered Air PACK units designed for natural gas are equipped with
appliance regulators. Manifold pressure is regulated by the combination valve to 3.5 W.C.
(.87 kPa). Line pressure upstream of the controls must be a minimum of 7" W.C. (1.74 kPa)
and a maximum of 14" W.C. (3.49 kPa).
(10 pages)
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