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III. HOW TO CHECK LAMP OPERATION
After your lamp has been installed by a qualified HVAC
Contractor, you may check its operation using the following
procedure. These instructions apply to Model 1910 and both
units that make up Model 1930. Read all WARNING
statements at the beginning of this manual. Failure to do so
could lead to personal injury and/or equipment damage.
IV. ANNUAL LAMP REPLACEMENT
Your Aprilaire Ultraviolet Germicidal Lamp is designed for the lamp to be on at all times. After 9,000 hours of operation – 1 year
of constant use – the effectiveness of the lamp inside the unit diminishes and needs to be replaced. Rarely will a lamp burn
out in one year of continuous use; replacement is necessary because the lamp's intensity decreases. Installation of the
replacement lamp (Aprilaire Service Part #90) is best handled by a qualified HVAC Service Contractor.
The steps for replacing the Lamp are the following (see Figures 1 - 3):
a. Switch ON/OFF SWITCH to 'Off' and unplug POWER
CORD. Wait several minutes for lamp to cool.
b. Loosen NUTS that secure UNIT HOUSING to BASE.
Remove UNIT HOUSING.
c. Loosen LAMP DOOR SCREW that secures LAMP DOOR to
BASE.
d. Carefully pull LAMP ASSEMBLY out of duct. This requires
that you slightly lift up and tilt forward the LAMP
ASSEMBLY while pulling out from the BASE.
e. Remove LAMP by pulling it out from LAMP SOCKET and
out from LAMP HOLDER.
f. Install new, replacement LAMP (Aprilaire Service Part #90)
into LAMP SOCKET and LAMP HOLDER. Be sure LAMP is
fully inserted into LAMP SOCKET.
Under normal conditions, your Aprilaire Ultraviolet Germicidal Lamp should not require any maintenance other than annual
lamp replacement.
1. Plug the lamp's POWER CORD into a standard 120 VAC
outlet that is always energized.
2. Turn the lamp's ON/OFF SWITCH to the 'On' position.
3. Look at the SIGHT GLASS located in the bottom center of
the UNIT HOUSING. See Figure 1. If the lamp is operating
correctly, the SIGHT GLASS will be illuminated by blue light.
If not, see the 'Troubleshooting' section for additional steps.
4. If any stray UV light can be seen, contact the HVAC
Contractor who installed the lamp to correct.
g. Use alcohol to remove any dirt and/or fingerprints from
the new LAMP.
h. Return LAMP ASSEMBLY to BASE and fasten LAMP
DOOR SCREW.
i. Put UNIT HOUSING back in place and fasten NUTS. Be
sure UNIT HOUSING rests completely on the BASE and
that all wiring is fully inside.
j. Plug in POWER CORD and turn ON/OFF SWITCH to 'On.' If
the lamp is operating correctly, the SIGHT GLASS will be
illuminated by blue light.
k. In the table provided on page 7, record the date LAMP
was replaced.
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