Maintenance - Lennox EL195UHE Unit Information

VI−MAINTENANCE
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result
in dangerous operation, serious injury, death or
property damage.
Improper servicing could result in dangerous opera-
tion, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace.
When servicing controls, label all wires prior to dis-
connecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
At the beginning of each heating season, system should be
checked as follows by a qualified service technician:
Blower
Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.
WARNING
The blower access panel must be securely in place
when the blower and burners are operating. Gas
fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal inju-
ry or death.
Filters
All air filters are installed external to the unit. Filters should
be inspected monthly. Clean or replace the filters when
necessary to ensure proper furnace operation. Table 21
lists recommended filter sizes.
TABLE 21
Furnace
Cabinet Width
Side Return
17−1/2" 16 X 25 X 1 (1)
21" 16 X 25 X 1 (1)
24−1/2" 16 X 25 X 1 (2)
Exhaust and air intake pipes
Check the exhaust and air intake pipes and all connections
for tightness and to make sure there is no blockage.
NOTE − After any heavy snow, ice or frozen fog event the
furnace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may be
obstructing the plastic intake or exhaust pipes.
Electrical
1 − Check all wiring for loose connections.
2 − Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC + 10%
Filter Size
Bottom Return
16 X 25 X 1 (1)
20 X 25 X 1 (1)
24 X 25 X 1 (1)
Page 47
3 − Check amp−draw using a true RMS meter on the blow-
er motor with blower access panel in place. See figure
62.
Unit Nameplate__________Actual__________
Check Motor Amp Draw
OFF
EX P
MR
W
3
2
1
kWh
kVAr
V1 V2 COM M
V3
True RMS Meter
FIGURE 62
Winterizing and Condensate Trap Care
1 − Turn off power to the furnace.
2 − Have a shallow pan ready to empty condensate water.
3 − Remove the clean out cap from the condensate trap
and empty water. Inspect the trap then reinstall the
clean out cap.
Cleaning Heat Exchanger
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to figure 1 when disassem-
bling unit. Use papers or protective covering in front of fur-
nace while removing heat exchanger assembly.
1 − Turn off electrical and gas supplies to the furnace.
2 − Remove the furnace access panels.
3 − Disconnect the 2 wires from the gas valve.
4 − Remove gas supply line connected to gas valve. Re-
move the burner box cover (if equipped) and remove
gas valve/manifold assembly.
5 − Remove sensor wire from sensor. Disconnect 2-pin
plug from the ignitor.
6 − Disconnect wires from flame roll−out switches.
7 − Disconnect combustion air intake pipe. It may be nec-
essary to cut the existing pipe to remove burner box
assembly.
8 − Remove four burner box screws at the vestibule panel
and remove burner box. Set burner box assembly
aside.
NOTE − If necessary, clean burners at this time. Follow
procedures outlined in Burner Cleaning section.
9 − Loosen the clamps to the flexible exhaust coupling.
10 − Disconnect condensate drain line from the cold end
header box.
11 − Disconnect condensate drain tubing from flue collar.
Remove screws that secures the flue collar into place.
Remove flue collar. It may be necessary to cut the exit-
ing exhaust pipe for removal of the fitting.