Lennox LGT Series Unit Information page 47

6 - Allow 10 minutes before touching the lamps. Then,
carefully remove the old lamp from the lamp holder
clips.
7 - Wear cotton gloves or use a cotton cloth when
handling the new lamp. Place the new lamp in the
holder clips of the UVC assembly. Verify that the
lamp flange at the connector end is sandwiched
between the lamp holder clip and the sheet-metal
end stop (see figure 38).
INSTALL LAMP IN HOLDER CLIPS
BANDS (see
Note below)
DETAIL A
LAMP
NOTE - The bands around the lamp should be evenly spaced
as shown in the diagram.
FIGURE 38
8 - Carefully place the UVC assembly on the blower
deck. Line up the mounting holes on the UVC
assembly with the mounting holes on the blower
deck See figure 37. Use the retained screws
provided to attach the UVC assembly in place.
9 - Close the blower access door.
10 - Reconnect power to the rooftop unit.
11 - Open the filter access door and look through the
view port in the triangular sheet-metal panel to
verify that the UVC light is on.
If UVC lamp does not come on:
1 - Check Power Wiring: Disconnect 1/4" QC (quick
connects) of the UVC cable near the UVC assembly.
With Power ON, use multimeter to test 110-230V at
the 1/4"QC quick connects from the control panel.
UVC
Sub-Assembly
SHEET METAL
END STOP
LAMP
FLANGE
4-PIN
CONNECTOR
HOLDER
CLIPS (2)
2 - Check Lamp: Carefully remove the UVC assembly
out of the rooftop unit. Use multimeter to test for
continuity across each pair of pins at each end of
the lamp.
3 - Check Lamp Installation: Make sure that lamp's
pins snap properly into the lamp holder.
LED(s) not illuminated
Power status LED not lit—Check that the lamp unit is con-
nected to the proper power source and is wired correctly.
Lamp status LED(s) not lit—
1 - Check that lamp 4-pin connectors are properly
engaged.
2 - Ohm-check across the lamp pins to check for
continuity of lamp filaments (see figure 40).
Troubleshooting charts are provided to aid in determining
the cause of any problems encountered (figures 39 and
40).
Hg-LAMP Contains Mercury.—Manage in accordance
with local, state and federal disposal laws. Refer to www.
lamprecycle.org or call 800-953-6669.
Proper Clean-up Technique in Case of Lamp Breakage
Wear protective gloves, eye wear and mask.
Sweep the broken glass and debris into a plastic bag, seal
the bag, and dispose of properly. Contact your local waste
management office for proper disposal.
Do not use a vacuum cleaner. Do not incinerate.
• For all maintenance, contact a qualified HVAC tech-
nician.
• Read the maintenance instructions before opening
unit panels.
• Unintended use of the unit or damage to the unit
housing may result in the escape of dangerous
UVC radiation. UVC radiation may, even in small
doses, cause harm to the eyes and skin.
• Do not operate units that are obviously damaged.
• Do not discard the triangular UVC light shield or any
barriers with an ultraviolet radiation symbol.
• Do not override the door interlock switch that inter-
rupts power to the UVC light.
• Do not operate the UVC light outside of the unit.
Page 47
Lamp Disposal
Maintenance