Lennox G1D93BC User Manual

# 45466K003 Page 11
Upflow Models G1D91BU, G1D93BU, & CG90UB
Non-Direct Vent Installation
An inlet air restrictor plate (see Figure 1 on page 5) is
supplied with this furnace and can be found in the plastic
bag containing these Installation Instructions and the
User’s Information Manual. This restrictor plate is to be
used only in non-direct vent applications. Attach a 90°
elbow (not supplied) to the inlet coupler and install the
restrictor plate inside the elbow in all non-direct vent
installations (see Figures 8 and 9).
The flue pipe screen (see Figure 1 on page 5) should be
installed at the termination of the flue pipe and is designed
to keep objects out of the flue pipe.
Prime the trap system by slowly pouring 1 cup of water
down the vent pipe.
For horizontal venting, refer to Figure 8. For vertical
venting, refer to Figure 9. The vent pipe on horizontal runs
must slope upward, away from the furnace, at a minimum
pitch of 1/4" per foot of run, to prevent accumulation of
condensate.
Figure 8
Upflow Non-Direct Vent
Horizontal Venting
(Models G1D91BU, G1D93BU,
& CG90UB Only)
(CLOSED) DRAINHOLE
THRU.
59.69/56.64
THE VENT SYSTEM OF
THE FURNACE MUST BE
SELF-SUPPORTING AND
MUST NOT APPLY ANY
WEIGHT LOAD TO THE
COMBUSTION BLOWER.
CAUTION
SEE TABLE FOR
PROPER PIPE SIZE.
RUN PITCH = 1/4
PER FOOT MIN.
"
HEIGHT TO PROVIDE
12 CLEARANCE TO
MAX. SNOW LEVEL.
"
6"
CONDENSATE
COLLAR
THE INLET AIR
RESTRICTOR PLATE
MUST BE INSTALLED
ON ALL NON-DIRECT
VENT INSTALLATIONS.
ATTACH A 90° ELBOW
TO THE INLET COUPLER
AND INSTALL THE INLET
AIR RESTRICTOR PLATE
INSIDE THE ELBOW.
INLET
COUPLER
Upflow Non-Direct Vent
Vertical Venting
(Models G1D91BU, G1D93BU,
& CG90UB Only)
Figure 9
On initial start-up of the unit, some of the water used to
prime the trap system may run down into the combustion
blower and cause noise.

Lennox G1D93BC Specifications

General

Brand	Lennox
Model	G1D93BC
Category	Furnace
Language	English