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2 − Install condensate trap onto the condensate collar.
Use provided HI/LO screws to secure two upper
flanges of the trap to the collar. Use provided sheet
metal screw to secure bottom trap flange to side of
unit. See figure 24.
NOTE − Make sure that O−rings are properly posi
tioned between trap and cabinet. O−rings provide
a seal between the trap and the condensate collar.
It is not necessary to apply glue or sealant.
NOTE − Condensate trap must be installed on the
same side as exhaust piping.
CAUTION
DO NOT use a power driver to tighten screws which
secure condensate trap to cabinet. Screws should
be hand−tightened using a screw driver to avoid the
possibility of damage to the trap assembly.
CONDENSATE ASSEMBLY
(For left or right installation −− Right side shown)
FIGURE 24
COUPLING
CAP
CONDENSATE TRAP
NIPPLE
NIPPLE
TEE
VENT
CLEAN−OUT ACCESS
(both sides)
HI/LO SCREWS
(DO NOT use power
driver. Hand−tighten
using screw driver.)
SCREW
O−RINGS
3 − Glue the field−provided coupling or pipe to the trap.
Install a tee and vent pipe near the trap.
NOTE − The condensate trap drain stubs (both sides)
have an outer diamer which will accept a standard 3/4"
PVC coupling. The inner diameter of each stub will ac
cept standard 1/2" diameter PVC pipe.
NOTE − Vinyl tubing may be used for condensate
drain. Tubing must be 1−1/4" OD X 1" ID and should be
attached using a hose clamp.
4 − Glue the field−provided drain line to the tee. Route the
drain line to an open drain. As an alternate, clear vinyl
tubing may be used to drain condensate away from
the trap. Secure the vinyl tubing to the trap using a
worm clamp. Do not overtighten the worm clamp.
Condensate line must be sloped downward away from
condensate trap to drain. If drain level is above con
densate trap, condensate pump must be used. Con
densate drain line should be routed within the condi
tioned space to avoid freezing of condensate and
blockage of drain line. If this is not possible, a heat
cable kit may be used on the condensate trap and line.
Heating cable kit is available from Lennox in various
lengths; 6 ft. (1.8m) − kit no. 18K48; 24 ft. (7.3m) − kit
no. 18K49; and 50 ft. (15.2m) − kit no. 18K50.
CAUTION
Do
not use copper tubing or existing copper
condensate lines for drain line.
5 − Glue the provided cap onto the unused condensate
drain line stub.
III−STARTUP
A−Preliminary and Seasonal Checks
1 − Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
2 − Check voltage at disconnect switch. Voltage must be with
in range listed on the nameplate. If not, consult the power
company and have voltage condition corrected be
fore starting unit.
3 − Inspect condition of condensate traps and drain as
sembly. Disassemble and clean seasonally.
B−Heating StartUp
BEFORE LIGHTING
the unit, smell all around the fur
nace area for gas. Be sure to smell next to the floor be
cause some gas is heavier than air and will settle on the
floor.
The gas valve on the G41UF may be equipped with either
a gas control knob or gas control lever. Use only your
hand to push the lever or turn the gas control knob. Never
use tools. If the lever will not move or the knob will not
push in or turn by hand, do not try to repair it. Call a quali
fied service technician. Force or attempted repair may
result in a fire or explosion.
Placing the furnace into operation:
G41UF units are equipped with a SureLight
t
ignition
system. Do not attempt to manually light burners on this
furnace. Each time the thermostat calls for heat, the
burners will automatically light. The ignitor does not get
hot when there is no call for heat on units with SureLight
t
ignition system.
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
Gas Valve Operation
1 −
STOP
! Read the safety information at the beginning of
this section.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do
not
try to light the
burners by hand.
5 − Remove the upper access panel.
