Maintenance
44
RRU-SVX01E-EN
Monthly Maintenance
Before completing the following checks, turn the unit OFF
and lock the main power disconnect switch open.
Filters
Cooling Season
Note:
Do NOT release refrigerant to the atmosphere! If
adding or removing refrigerant is required, the
service technician must comply with all federal,
state and local laws.
Heating Season
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged.
Inspect the outdoor air filters. Clean or replace them
if necessary.
Check the unit’s drain pans and condensate piping to
ensure that there are no blockages.
WARNING
Hazardous Pressures!
Failure to follow safety instructions below could result
in coil bursting, which could result in death or serious
injury. Coils contain refrigerant under pressure. When
cleaning coils, maintain coil cleaning solution
temperature under 150°F to avoid excessive pressure in
the coil. Do not heat the detergent-and-water solution
above 150°F. Hot liquids sprayed on the exterior of the
coil will raise the coil’s internal pressure and could
cause it to burst.
Inspect the evaporator and condenser coils for dirt,
bent fins, etc. If the coils appear dirty, clean them
according to the instructions described in
.
Manually rotate the condenser fan(s) to ensure free
movement and check motor bearings for wear. Verify
that all of the fan mounting hardware is tight.
Inspect the Outdoor and Return Dampers (optional) to
ensure that all moving parts are securely mounted.
Keep the blades clean as necessary.
Verify that all damper linkages move freely; lubricate
with white grease, if necessary.
Check supply fan motor bearings; repair or replace
the motor as necessary.
Check the fan shaft bearings for wear. Replace the
bearings as necessary.
Check the supply fan belt. If the belt is frayed or worn,
replace it. Refer to
“Fan Belt Adjustment—Belt Drive
for belt replacement and adjustments.
Verify that all wire terminal connections are tight.
Remove any corrosion present on the exterior
surfaces of the unit and repaint these areas.
Generally inspect the unit for unusual conditions
(e.g., loose access panels, leaking piping connections,
etc).
Make sure that all retaining screws are reinstalled in
the unit access panels once these checks are
complete.
With the unit running, check and record the: ambient
temperature; compressor suction and discharge
pressures (each circuit); superheat (each circuit).
Record this data on an “operator’s maintenance log”
like the one shown in
. If the operating
pressures indicate a refrigerant shortage, measure
the system superheat. For guidelines, refer to
.
Inspect the unit’s outdoor air filters. If necessary,
clean or replace them.
Check supply fan motor bearings; repair or replace
the motor as necessary.
Inspect both the Main Unit Control Panel and Burner
Control Panel for loose electrical components and
terminal connections, as well as damaged wire
insulation. Make any necessary repairs.
