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11. Replace panels and reconnect electrical power.
12. Test unit operation.
CLEANING THE EXTERIOR
1. Clean the air filter at least once a month by removing
it from the unit and washing or vacuuming any dust
from its surface. Allowing dust to collect on the filter
will cause the PTAC to lose efficiency and eventually
malfunction.
2. When cleaning the filter, be sure to vacuum any dust
from the return air grille surface as well.
3. Clean exterior of the cabinet as desired with a mild soap
or household cleaner.
IMPORTANT:
If a new air filter is needed for your
RetroAire Dual Motor PTAC, consult factory for avail-
ability and/or proper sizing.
TROUBLESHOOTING
NO HEAT OR COOLING: Check to see if the unit has
power and if the thermostat is satisfied. If the thermostat is
not satisfied, refer to the wiring diagram and check control
components for continuity.
CLEANING THE INTERIOR OF THE UNIT
CLEANING AND MAINTENANCE
It is illegal to discharge refrigerant into the atmo-
sphere. Use proper reclaiming methods and equip
-
ment when servicing a RetroAire Dual Motor PTAC.
!
!
WARNING
Reset Button
*Note:
Button will pop
out when limit
switch opens.
Push in to reset.
Check The Manual Reset Limit Switch
(5 Kw heat models only)
In the event the limit switch
opens and de-energizes
the electric heat, the limit
switch will need to be man-
ually reset.
• To reset switch remove
the control box cover.
• Locate the limit switch.
• Push in the reset button
on the face of the switch. (Refer to illustration above)
1. Disconnect power from unit.
2. Remove access panels and do a visual inspection of
the unit, making sure to check for obvious problems
such as damaged coils or evidence of extended wear
on any moving part.
3. Check for unusual odors, oil leaks, or stains on or
around the coil and refrigerant lines. The presence of
oil here may indicate a potentially serious problem such
as a refrigerant leak.
4. Inspect all electrical connections. Look for frayed wires
and poor connections.
Terminal ends that are loose will
eventually fail, causing a loss of performance or worse.
5. Check fan motors and blower assemblies.
Some units
may require a drop of light oil to motors and/or bearing
assemblies (look for oil cups). Check setscrews and
motor mounting hardware, making sure they are tight.
6. Brush and/or vacuum the centrifugal fan blades and
blower cage assemblies. These parts must be clean to
operate efficiently.
7. Inspect and clean the indoor
and outdoor coils, using a
fin comb, if necessary, to straighten any damaged fins.
these coils must be clean for proper operation.
IMPORTANT: Do not use a solvent-based cleaner
on the indoor or outdoor coils.
Some solvents can
produce a noxious odor when starting the fan or
electric heat.
8. Inspect and clean the drain pan and drainline (if any).
Use of an anti-fungicide tablet is recommended to
keep the condensate system free from bacterial con
-
taminants.
9. Check weep holes along the rear flange of the base pan,
making sure they are open.
10. Check the pitch of the unit. Over time the building and
equipment may settle, causing a shift in the direction
of the condensate flows. Ideally the unit should pitch
a minimum of 5° (at least ½”) to the outside to allow for
proper drainage.
!
!
Before servicing the RetroAire Dual Motor PTAC, be
sure to turn off electrical power to the unit. Failure to
do so can result in a fire, explosion or electrical shock
causing property damage, personal injury or death.
DANGER