Lennox EL195UHNE Series Manual page 47

Winterizing and Condensate Trap Care
1 - Turn off power to the unit.
2 - Have a shallow pan ready to empty condensate
water.
3 - Remove the drain plug from the condensate trap
and empty water. Inspect the trap then reinstall the
drain plug and refill trap with water.
Condensate Hose Screens (Figure 61)
Check the condensate hose screens for blockage and
clean if necessary.
1 - Turn off power to the unit.
2 - Remove hoses from cold end header box. Twist
and pull screens to remove.
3 - Inspect screens and rinse with tap water if needed.
4 - Reinstall screens, reconnect hoses and turn on
power to unit.
Condensate Hose Screens
Hose
FIGURE 61
Heat Exchanger and Burners
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to figures 1 and 62 when
disassembling unit. Use papers or protective covering in
front of furnace while removing heat exchanger assembly.
1 - Turn off both electrical and gas power supplies to
furnace.
2 - Remove exhaust pipe from appliance adaptor
but leave adaptor connected to exhaust coupling.
Remove top cap and intake air pipe from side of
unit.
3 - Label the wires from gas valve, thermal switch,
primary limit switch and make-up box then
disconnect them.
4 - Label then disconnect the wires from gas valve,
thermal switch, primary limit switch and make-up
box.
5 - Disconnect gas supply piping. Remove the screw
securing the air fuel plenum and remove along with
the air inake assembly as one component.
6 - Remove screws from both sides, top and bottom of
vestibule panel.
7 - Remove heat exchanger. It may be necessary to
spread cabinet side to allow more room.
8 - Back wash using steam. Begin from the burner
opening on each tube. Steam must not exceed
275°F.
9 - Run a vacuum cleaner over the face of burner.
Visually inspect inside the burner. Remove any
blockage. Replace gasket between burner plate
and air fuel plenum then re-install burner plate.
10 - To clean the combustion air inducer visually inspect
and using a wire brush clean where necessary. Use
compressed air to clean off debris and any rust.
11 - 1 Reinstall heat exchanger in vestibule.
12 - Reinstall the air fuel plenum and air intake assembly.
13 - Re-install the combustion air inducer assembly.
Make note to re-install all screws. Failure to replace
all screws may cause leaks. Reconnect all wires.
14 - Reconnect top cap and exhaust pipe to combustion
air inducer outlet. Reconnect intake air pipe.
Hose
15 - Reconnect gas supply piping.
16 - Turn on power and gas supply to unit.
17 - Set thermostat and check for proper operation.
18 - Check all piping connections, factory and field, for
gas leaks. Use a leak detecting solution or other
preferred means.
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or other sources of ignition
to check for gas leaks.
19 - If a leak is detected, shut gas and electricity off and
repair leak.
20 - Repeat steps 18 and 19 until no leaks are detected.
21 - Replace access panel.
Page 47
CAUTION