WIRING
The multivoltage ballast is self-adjusting and operates with voltages from 120 - 240 VAC. This unit must
cycle with the furnace blower. Install provided 120 VAC power cord and plug the unit into a 120 VAC outlet which is
interlocked with the furnace blower. If an EAC terminal is available, supply power to the outlet from the EAC terminal.
Connect in accordance with local wiring codes. If there is no EAC terminal, interlock the UV unit with the furnace blow-
er using an appropriate alternate. After installing verify voltage is operating between 120 - 240 VAC with air handler
operating. An optional 240 VAC power cord is available, Part #PC-240, for 240 VAC installations.
SETTING THE OZONE OUTPUT LEVEL
• The air purification process occurs only while air is circulating through the HVAC system.
• The ozone level can be easily adjusted as needed using the “Ozone Output” knob on the front cover of unit.
Start with the ozone setting in the normal range. Decrease the setting if ozone odor is detectible.
If household odors are noticeable after 24 hours, increase the setting.
MAINTENANCE
This maintenance schedule is only a guideline, determined by average conditions. Actual conditions will dictate
the frequency of cleaning and/or replacement of lamps. Do not touch the glass portion of the lamps with bare hands
because oils from the hands can cause “hot spots” which reduce lamp life. Handle either by the porcelain caps
or use a soft cloth. If you accidentally touch a lamp, wipe it off, using a soft cloth dampened with rubbing alcohol.
CLEANING THE LAMPS -
Recommended interval: 12 months (Follow procedure below)
Replacement lamps are available through your HVAC contractor.
REPLACING THE LAMPS -
Recommended interval: 24 months. (Follow procedure below excluding #6.)
1. Unplug the power cord from the outlet, or disconnect power to the unit.
2. Remove the cover from the unit by removing the top and bottom
retaining nuts using a 11/32 size nut driver. Do not remove the Ozone
Control knob.
(For easier installation rotate the ozone control knob to
the center position before removing cover.)
3. Unplug the lamp connector from the end of each lamp.
4. Remove lamp holders using a 11/32 size nut driver.
(Figure A)
5. Remove each lamp by grasping the porcelain cap and
extract carefully.
6. Using a soft cloth moistened with rubbing alcohol, wipe down
each lamp. If there is a large build-up of dust particles, you may
wish to use a can of air first. Always handle lamps by end caps.
7. Slide one lamp back into lamp opening. Reinstall lamp holder.
8. Repeat step 7 for second lamp.
9. Plug the lamp connector to the end of each lamp.
10. Replace cover and align the ozone control knob with ozone
adjustment linkage by gently turning the knob until linkage
clicks into place. Secure cover using the two retaining nuts.
11. Plug power cord back into outlet, or restore power to unit.
INSTALLATION:
Living space, 1,200 square feet minimum.
• Best results are achieved when the unit is installed where the HVAC system air temperature is most constant.
Therefore, the preferred installation is on the
return side
of the furnace. If return side installation is not possible,
install the unit on the supply side, keeping it as far from the heat/cooling source as possible, and in the main airstream.
Mount the GUV25403A upstream when installing in combination with a GeneralAire H.E.P.A. unit.
If there is an existing ozone producing device on the furnace, install one of our non-ozone producing models.
• Do not locate the unit within 20” of any plastic material that will be directly exposed to the UV light, such as
a return side humidifier or certain types of air filters. Check with the filter manufacturer to see if their material is
UV resistant. Over time, UV light will degrade many plastic materials.
• Do not touch the glass portion of the lamps with bare hands because oils from the hands can cause “hot spots”
which reduce lamp life. Handle either by the porcelain caps or use a soft cloth. If you accidentally touch a
lamp, wipe it off, using a soft cloth dampened with rubbing alcohol.
1. Cut out the shaded area of the installation template.
(See insert)
2. Center template on the longitudinal axis of the plenum using tape to hold it in place.
Trace the hole pattern for the unit and mark centers for mounting screws.
(Airflow direction is marked on the air purifier unit.)
3. Cut opening for the unit and drill 9/64” holes for sheet metal screws.
4. Remove the cover from the unit by removing the top and bottom retaining nuts using an 11/32 size
nut driver and set aside. Do not remove the ozone control knob.
(For easier installation rotate ozone control knob
to the center position before removing cover.)
5. Attach unit to air duct using the four
sheet metal screws provided.
6. Remove germicidal lamp holder
(Figure A)
using a 11/32 size nut driver.
7. Slide germicidal lamp into lamp opening.
8. Reinstall lamp holder.
9. Plug in lamp connector to the end of lamp.
10. Replace cover and align the ozone control
knob with ozone adjustment linkage by
gently turning the knob until linkage
clicks into place. Secure cover using
the two retaining nuts.
(Figure A)
Germicidal
Lamp
Holder
Ozone
Lamp
Holder
Ground
