GMES96-U Installation Manual

9
Figure 3
FRONT COVER PRESSURE SWITCH TUBE LOCATION
When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-located to
the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top collector box port.
3. Locate 24” x 1/4” tube in bag assembly.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and
cut off excess tubing.
DRAIN TRAP AND LINES
In horizontal applications the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A mini-
mum clearance of 5.5” below the furnace must be provided for
the drain trap. Additionally, the appropriate downward piping
slope must be maintained from the drain trap to the drain loca-
tion. Refer to Condensate Drain Trap and Lines for further de-
tails. If the drain trap and drain line will be exposed to tempera-
tures near or below freezing, adequate measures must be taken
to prevent condensate from freezing.
LEVELING
Leveling ensures proper condensate drainage from the heat ex-
changer. For proper flue pipe drainage, the furnace must be
level lengthwise from end to end. The furnace should have a
slight tilt from back to front with the access doors downhill
from the back panel approximately 1/2" to 3/4". The slight tilt
allows the heat exchanger condensate, generated in the
recuperator coil, to flow forward to the recuperator coil frontcover.
ALTERNATE VENT/FLUE AND COMBUSTION AIR CONNECTONS
In horizontial installations provisions for alternate flue and
combustion air piping are available for upflow furnaces with
left discharge. This configuration allows the flue and com-
bustion air piping to be run vertically through the side of the
furnace. Refer to the “Recommended Installation Positions”
figure for further detail. The standard piping connections
may also be used in these positions. Refer to Vent/Flue Pipe
and Combustion Air Pipe for details concerning the conver-
sion to the alternate vent/flue and combustion air connec-
tions.
When using the horizontal alternate vent configuration, you
must use the RF000142 vent drain kit. See Figure 9.
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS
This furnace has provisions allowing for electrical and gas line
connections through either side panel. In horizontal applications
the connections can be made either through the “top” or “bot-
tom” of the furnace.
DRAIN PAN
A drain pan must be provided if the furnace is installed above a
conditioned area. The drain pan must cover the entire area
under the furnace (and air conditioning coil if applicable).
FREEZE PROTECTION
Refer to Horizontal Applications and Conditions - Drain Trap and
Lines.
H IGH A LTITUDE I NSTALLATION
High Altitude Insallation Unit can be installed from 0-4500 ft
only. See table 2.
Natural 0-4500' None 3.0" WC None
Manifold
Pressure
Pressure
Switch
Change
Gas Altitude Kit
Table 2
V ENT /F LUE P IPE & C OMBUSTION A IR P IPE
This manual will refer to the pipe that discharges products
of combustion to the outdoors as the “vent” pipe or “flue”
pipe. The pipe that supplies air for combustion to the fur-
nace will be referred to as the “intake” pipe or “combustion
air” pipe. A condensing gas furnace achieves its high level of
efficiency by extracting almost all of the heat from the products
of combustion and cooling them to the point where condensation
takes place. Because of the relatively low flue gas temperature
and water condensation requirements, PVC or ABS pipe is typi-
cally used as venting and intake pipe materials.