ECR RetroAire R90C Installation, operation & maintenance manual - page 22
MAINTENANCE
Monthly Inspection And Maintenance
WARNING
Electrical shock hazard
— disconnect power to
replacement PTAC/PTHP before servicing or
accessing control compartment. Failure to do so
could result in severe personal injury or death.
!
NOTICE
It is illegal to discharge refrigerant into atmosphere.
Use proper reclaiming methods and equipment when
servicing RetroAire replacement PTAC/PTHP.
For optimum performance and reliability of your RetroAire
replacement PTAC/PTHP, manufacturer 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 access panels.
☐
Clean or replace indoor air filter.
☐
Vacuum return air grille surface.
☐
Inspect & clean chassis interior for rodent or insect
infestation.
☐
Clean & flush condensate drain pan and chassis
base pan.
☐
Verify condensate drain is functioning properly, if
applicable.
☐
Inspect refrigeration tubing, braze joints, for
signs of refrigerant leaks
(oil residue)
. Repair if
necessary.
☐
Inspect indoor and outdoor coils. Verify dirt
or debris have not collected on fins. Clean if
necessary. Take care not to damage coil fins when
cleaning. Use fin comb to straighten any bent
fins.
☐
Examine control box. Verify all wire connections
are secure.
☐
Verify indoor blower wheels and outdoor fan
blades are secured to their motor shafts.
☐
Verify dirt or debris have not collected on indoor
blower wheels and outdoor fan blades. Use
vacuum and soft brush to clean if necessary.
☐
Units with hydronic option installed, inspect
piping, braze joints, for signs of water leaks.
Repair if necessary.
☐
Clean exterior cabinet as desired with mild soap
or household cleaner.
☐
5 kW heat models only
— in event limit switch
opens and de-energizes electric heat, manually reset
limit switch.
To manually reset limit switch;
–
Remove control box cover.
–
Locate limit switch.
–
Push reset button in. See Figure 12.
Figure 12
Manual Reset Limit Switch
Reset Button
*Note:
Button will pop
out when limit
switch opens.
Push in to reset.
NOTICE
Clean or replace return air filter as needed. Allowing
dust to collect on filter will cause unit to lose
efficiency and eventually malfunction. Check filter
at least once month. Some environments may
require more frequent replacement, depending on
particulate in air stream.
If new air filter is needed for your RetroAire
replacement PTAC/PTHP, consult manufacturer for
availability and/or proper sizing.
Seasonal Start-Up And Maintenance
Perform complete mechanical check and maintenance
inspections at beginning of cooling and heating season.
Disconnect power to unit
and remove access
panels.
• Perform inspections and maintenance defined in
"Monthly Start-Up And Maintenance."
• Visually check equipment. Look for changes in 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 coil and refrigerant lines. Presence of oil may
indicate potentially serious problem such as refrigerant
leak
(example — burned motor windings, water, or
refrigerant).
• Verify base pan is clean.
• Inspect all electrical connections. Look for frayed wires
and poor connections. Terminal ends that are loose will
eventually fail, causing loss of performance or worse.
The Right Fit for Comfort
22
P/N 240010330, Rev. A [10/15/2013]