Lennox G61MPV Service Manual page 56

PLUG
(Must be
glued in
place)
1 − Use field−provided materials and the factory−provided
air intake screen to route the intake piping as shown in
figures 28 and 29. Maintain a minimum clearance of 3"
(76mm) around the air intake opening. The air intake
opening (with the protective screen) should always be
directed either downward or straight out. Use 2" pipe
and fittings only and make sure that the air intake does
not extend more than 6" beyond the G61MPV cabinet.
The air intake connector must not be located near
the floor. To avoid this complication in downflow
applications which do not include a downflow
evaporator coil, the intake air routing should be modi-
fied as shown in figure 29.
2 − Use a sheet metal screw to secure the intake pipe to the
connector, if desired. A pilot indentation is provided in the
slip connector to assist in locating and starting the fasten-
er.
3 − Glue the provided 2" plug into the unused air intake con-
nector on the opposite side of the cabinet.
Testing for Proper Venting and Sufficient Combustion Air
(Non−Direct Vent Applications Only)
WARNING
CARBON MONOXIDE POISONING HAZARD!
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monox-
ide poisoning or death.
The following steps shall be followed for each ap-
pliance connected to the venting system being
placed into operation, while all other appliances con-
nected to the venting system are not in operation.
TYPICAL AIR INTAKE PIPE CONNECTIONS
DOWNFLOW NON−DIRECT VENT APPLICATIONS
(Right−Hand Exit in Downflow Applications Shown)
6 in. Max.
INTAKE DEBRIS
SCREEN
(Provided)
Downflow
NOTE − Debris screen and sweep ell may be rotated, so that
Evaporator
screen may be positioned to face forward, backward or to the side.
Coil
FIGURE 29
Page 56
PLUG
(Must be
glued in
place)
After the G61MPV gas furnace has been started, the fol-
lowing test should be conducted to ensure proper venting
and sufficient combustion air has been provided to the
G61MPV, as well as to other gas-fired appliances which
are separately vented. The test should be conducted while
all appliances (both in operation and those not in operation)
are connected to the venting system being tested. If the
venting system has been installed improperly, or if provi-
sions have not been made for sufficient amounts of com-
bustion air, corrections must be made as outlined in the
previous section.
1 − Seal any unused openings in the venting system.
2 − Visually inspect the venting system for proper size and
horizontal pitch. Determine there is no blockage or re-
striction, leakage, corrosion, or other deficiencies
which could cause an unsafe condition.
3 − To the extent that it is practical, close all building doors
and windows and all doors between the space in which
the appliances connected to the venting system are lo-
cated and other spaces of the building.
4 − Close fireplace dampers.
5 − Turn on clothes dryers and any appliances not con-
nected to the venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they will operate at maximum speed. Do not operate a
summer exhaust fan.
6 − Follow the lighting instruction to place the appliance
being inspected into operation. Adjust thermostat so
appliance will operate continuously.
7 − Use the flame of a match or candle to test for spillage
of flue gases at the draft hood relief opening after 5
minutes of main burner operation.
8 − If improper venting is observed during any of the
above tests, the venting system must be corrected or
sufficient combustion/make-up air must be provided.
2" SWEEP
ELL
INTAKE
DEBRIS
SCREEN
(Provided)
2"
18 in.
2" SWEEP ELL
Downflow Additive Flloor Base