Monthly inspection and maintenance
DANGER
Electrical shock hazard
— disconnect power to the
RetroAire replacement PTAC/PTHP before servicing or ac-
cessing the control compartment. Failure to do so could result
in severe personal injury or death.
WARNING
It is illegal to discharge refrigerant into the atmosphere. Use
proper reclaiming methods and equipment when servicing a
RetroAire replacement PTAC/PTHP.
For optimum performance and reliability of your RetroAire replace-
ment PTAC/PTHP, ECR International recommends performing the
following inspections and maintenance on a monthly basis. Units that
are installed in harsh or dirty environments will require more frequent
inspections and maintenance.
Disconnect power to unit
and remove necessary access panels.
Clean or replace the indoor air filter.
☐
Vacuum return air grille surface.
☐
Inspect & clean the chassis interior for rodent or insect infestation.
☐
Clean & flush condensate drain pan and chassis base pan.
☐
If applicable, ensure the condensate drain is functioning properly.
☐
Inspect refrigeration tubing, especially braze joints, for signs of
☐
refrigerant leaks
(oil residue)
. Repair if necessary.
Inspect indoor and outdoor coils. Ensure dirt or debris have not col-
☐
lected on the fins. Clean if necessary. Be careful not to damage coil
fins when cleaning. Use a fin comb to straighten any bent fins.
Examine control box. Ensure all wire connections are secure.
☐
Ensure indoor blower wheels and outdoor fan blades are secured
☐
to their motor shafts.
Ensure dirt or debris have not collected on the indoor blower
☐
wheels and outdoor fan blades. Use a vacuum and soft brush to
clean if necessary.
If the unit has a hydronic option installed, inspect piping, espe-
☐
cially braze joints, for signs of water leaks. Repair if necessary.
Clean the exterior of the cabinet as desired with a mild soap or
☐
household cleaner.
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 manu-
ally reset.
To reset switch:
Remove the control box cover.
•
Locate the limit switch.
•
Push in the reset button on the face of the switch (see
•
Figure 38).
Maintenance & Troubleshooting
Figure 38
Manual Reset Limit Switch
Reset Button
*Note:
Button will pop
out when limit
switch opens. Push
in to reset.
WARNING
Clean or replace the return air filter as needed. Allowing dust
to collect on the filter will cause the unit to lose efficiency and
eventually malfunction. Check the filter at least once a month.
Some environments may require more frequent replacement,
depending on particulate in the air stream.
NOTICE
If a new air filter is needed for your RetroAire replacement PTAC/
PTHP, consult factory for availability and/or proper sizing.
Seasonal start-up and maintenance
At the beginning of the cooling and heating seasons, a complete me-
chanical check should be performed and maintenance/inspections
performed as described below.
Disconnect power to unit
and remove necessary access panels.
Performing the inspections and maintenance defined in
1.
"Monthly start-up and maintenance."
Do a visual check of the equipment. Look for obvious changes in
2.
the unit such as damaged coils or evidence of extended wear on
any moving parts.
Check for unusual odors, oil leaks, or stains on or around the
3.
coil and refrigerant lines. The presence of oil here may indicate
a potentially serious problem such as a refrigerant leak
(example
— burned motor windings, water, or refrigerant).
Make sure the base pan is clean.
4.
Inspect all electrical connections.
5.
Look for frayed wires and poor
connections. Terminal ends that are loose will eventually fail, caus-
ing a loss of performance or worse.
Check fan motors and blower assemblies. Some units may require
6.
a drop of light oil to motors and/or bearing assemblies (
look for oil
cups
). Ensure setscrews and motor mounting hardware are tight.
Brush and/or vacuum the centrifugal fan blades and blower cage
7.
assemblies, as they must be clean to operate efficiently.
Inspect both indoor and outdoor coils. Use a fin comb to straighten out
8.
any damaged fins. These coils must be clean for proper operation.
WARNING
Do not use a solvent-based cleaner to clean coils, as some solvents
will produce a noxious odor when the unit is in operation.
Replacement Packaged Terminal Air-Conditioning / Heat Pump
• Installation, Operation, and Maintenance Manual •
The Right Fit for Comfort
32
P/N 240008034, Rev. D [7/29/2011]
