Aprilaire 1953 & 1972 - Manual (Page 11)

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VI. TROUBLESHOOTING
If the Lamp does not operate, check the following:
1. Electrical Connections – Verify that the Lamp has been wired correctly. The power to lamp must be always ‘on’ during normal
operation. On External Mount Units, verify that safety switch inside the cover of Unit Base has not been damaged. The voltage into
the units should be in the range of 120 - 277 VAC / 60 Hz / single phase. If it is not in that range, re-check the wiring or contact
an electrician.
2. Fuse – If the lamp is still not illuminated, turn off power to the rooftop unit, and check the Fuse. Look to see if Fuse is darkened or
visibly blown (i.e., wire broken) or check fuse continuity with multi-meter.
3. Lamp – Verify that Lamp is not broken and is properly seated into Lamp Socket. To check this, shut off power to the rooftop unit
and wait several minutes for lamp to cool before proceeding. Then remove access panels in order to look at Lamp. Verify that lamp
tube is not broken and that it is firmly pushed into its’ Lamp Socket. If necessary, use alcohol to remove any dirt and/or fingerprints
from the lamp. If the lamp is broken read the ‘Lamp Disposal’ section of this manual for proper disposal.
4. Ballast – If all of the above is okay, but the light still does not illuminate, the starter in the Ballast is likely shorted out and the
Ballast must be replaced.
V. LAMP DISPOSAL
As with a fluorescent light bulb, the UV lamp contains mercury and must be disposed of properly. Do not throw old lamps into the
trash. Many communities have agencies that take in mercury along with other materials – such as old paints, solvents, etc. – that
require special disposal. Please contact your municipal or county waste collection agency for proper disposal procedures.
If a lamp is broken, do not use a vacuum cleaner to pick up the waste. Instead, sweep up the waste into a plastic bag and seal.
Contact your municipal or county waste collection agency for proper disposal procedures.
LIST OF REPLACEMENT PARTS
Model 1952 Replacement Lamp #94
Model 1953 Replacement Lamp #96
Model 1972 Replacement Lamp #90
Multi-Voltage High Output Ballast
(for 1952, 1953, and 1972)
#4466
Fuse (3 Amp, slow burn) #4412
Fuse Cap #4413
Lamp Socket #4414
VII. LAMP REPLACEMENT RECORD
Date Dealer Name Date Dealer Name