Lennox LGT092H - Page 48

Page 48
3- Open the blower access door.
4- Remove the screw in wire tie from the UVC assembly
and disconnect the 4-pin connector from the lamp end.
5- Remove and retain the (3) screws securing the UVC
assembly. Carefully slide the complete UVC assembly
out through the blower access door. See figure 37.
FIGURE 38
LAMP
FLANGE
4-PIN
CONNECTOR
HOLDER
CLIPS (2)
SHEET METAL
END STOP
DETAIL A
BANDS (see
Note below)
UVC
Sub-Assembly
LAMP
NOTE - The bands around the lamp should be evenly spaced
as shown in the diagram.
INSTALL LAMP IN HOLDER CLIPS
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).
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 con
nects) 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.
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 en
gaged.
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).
Lamp Disposal
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 Break
age
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.
Maintenance
S For all maintenance, contact a qualified HVAC techni
cian.
S Read the maintenance instructions before opening unit
panels.
S Unintended use of the unit or damage to the unit hous
ing may result in the escape of dangerous UVC radia
tion. UVC radiation may, even in small doses, cause
harm to the eyes and skin.
S Do not operate units that are obviously damaged.
S Do not discard the triangular UVC light shield or any
barriers with an ultraviolet radiation symbol.
S Do not override the door interlock switch that interrupts
power to the UVC light.
S Do not operate the UVC light outside of the unit.