Trane RRU150F N Series Installation, Operation And Maintenance Manual page 43

9. If the coil remains dirty, repeat
10. Replace all panels and parts and restore electrical
power.
Microchannel Coil Cleaning
Note: For additional information on Microchannel coil
cleaning, refer to RT-SVB83*-EN (General Service
Bulletin: Microchannel Coil Servicing Guidelines).
Recommended Cleaning Procedures
Regular coil maintenance, including annual cleaning-
enhances the unit's operating efficiency by minimizing
compressor head pressure and amperage draw. The
condenser coil should be cleaned at least once each year
or more if the unit is located in a "dirty" or corrosive
environment. Cleaning with cleansers or detergents is
strongly discouraged due to the all aluminum
construction; straight water should prove sufficient.
Microchannel coils can be more susceptible to corrosion if
the cleanser or detergent used is not thoroughly washed
or rinsed off. Any breach in the tubes can result in
refrigerant leaks.
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.
1. Disconnect power to the unit.
CAUTION
Personal Protective Equipment (PPE)
Required!
Failure to follow all safety instructions below could
result in minor to moderate injury.
ALWAYS wear Personal Protective Equipment (PPE)
including goggles or face shield, chemical resistant
gloves, boots, apron or suit as required. If it becomes
necessary to use cleaning agent, refer to the
manufacturer's Materials Safety Data Sheet and follow
all recommended safe handling practices.
2. Wear proper personal protection equipment such as a
face shield, gloves and waterproof clothing.
3. Remove enough panels from the unit to gain safe
access to the microchannel coil.
4. Use a soft brush or vacuum to remove base debris or
surface loaded fibers from both sides of the coil.
5. Using a sprayer and water ONLY, clean the coil
following the guidelines below.
RRU-SVX02F-EN
Step 7 and Step 8. Note: It is better to clean the coil from the opposite
direction of normal air flow (inside of unit out)
because this allows the debris to be pushed out
rather than forced further into the coil.
WARNING
No Step Surface!
Failure to follow instruction below could result in death
or serious injury.
Do not walk on the sheet metal drain pan.Walking on
the drain pan could cause the supporting metal to
collapse and result in the operator/technician falling.
Important: Bridging between the main supports
required before attempting to enter the unit.
Bridging may consist of multiple 2 by 12
boards or sheet metal grating.
a. Sprayer nozzle pressure should not exceed 600 psi.
b. The maximum source angle should not exceed 25°
to the face of the coil (see
results, spray the microchannel perpendicular to
face of the coil.
c. Spray nozzle should be approximately 1–3 in. from
the coil surface.
d. Use at least a 15º fan type of spray nozzle.
Figure 19. Source angle
Maintenance
Figure 19). For best
Source Angle
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