Page 4 of 16
506941-01
Issue 1148
NOTE:
If a gas furnace that’s connected to a common
venting system is being removed when this package unit
is installed, then read and follow the instructions in the
“Removal of Unit from Common Venting System” section
that follows. Otherwise, you may skip this section.
Removal of Unit from Common Venting System
When an existing furnace is removed from a common venting
system serving other appliances, the venting system is likely
to be too large to properly vent the remaining attached
appliances. The following test should be conducted with
each appliance while the other appliances connected to the
common venting system are not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion, or other defi ciencies
which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows between the space in which the appliances
remaining connected to the common venting system
are located and other spaces in the building. Turn on
clothes dryers and any appliance not connected to the
common venting system. Turn on exhaust fans, such
as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer
exhaust fan. Close fi replace dampers.
4. Following the lighting instructions, place the unit being
inspected in operation. Adjust the thermostat so the
appliance will operate continuously.
5. Test for spillage at the draft control relief opening after
5 minutes of main burner operation. Use the fl ame of
a match or candle.
6. Follow the preceding steps for each appliance
connected to the common venting system.
7. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers,
and any other fuel burning appliance to their previous
condition of use.
8. If improper venting is observed during any of the above
tests, the common venting system must be corrected.
See National Fuel Gas Code, ANSI Z223.1 (latest
edition) or CAN/CGA B149.1 & .2 Canadian Installation
Codes
to correct improper operation of common venting
system.
Minimum horizontal clearance of 4’ (ft.) from electric meters,
gas meters, regulator, and relief equipment is required.
In addition to the above requirements, consideration must
be given to prevent unwanted ice buildup from the vent
condensate. The vent should not be located on the side of
a building where the prevailing winter winds could trap the
moisture, causing it to freeze on the walls or on overhangs
(under eaves). The vent location should not discharge over
a sidewalk, patio, or other walkway where the condensate
could cause the surface to become slippery.
The products of combustion must not be allowed to
accumulate within a confi ned space and recirculate.
Vent Cover
For shipping purposes, the unit is shipped with the vent cover
packaged in the unit supply air compartment. Retrieve the
vent cover from the supply air compartment.
To attach the vent cover to the unit:
1. Locate the vent screen. It is packed in the plastic bag
that contains these Installation Instructions.
2. Remove the two screws that will be used to attach the
screen to the unit (see Figure 4).
3. Center the screen over the hole and re-insert the screws
removed in Step 2.
4. Remove the 4 screws that will be used to attach the
vent cover (see Figure 4). Install the vent cover using
these screws. A properly installed vent cover will not
extend above the top of the unit.
Installing the Vent Cover
Figure 4
Screen
Screen attachment screws
Vent Cover
Vent Cover
Attachment
Screws
(Plus 2 on
other side)
