Maintenance
46
RRU-SVX01E-EN
7. Replace all access panels which have been removed
and operate the unit for a test period.
8. Check all gas piping for possible leaks using a soap
bubble solution.
9. Place the system back into operation and view burner
while cycling through full firing range. This will give a
visual check for blocked burner spots.
10. Check for normal response and function of all controls.
11. Confirm air pressure drop across burner profile plate is
within design see
12. Clean the burner plates.
13. Clear the burner gas and air ports.
14. Inspect the spark rod igniter and replace if required.
15. Ensure the flame sensor is in good condition.
Coil Cleaning
Units with Formed Coil Bends
The outdoor coils on all air conditioning equipment will
need periodic cleaning. The construction of the outdoor
coils of the units is somewhat different than normally
anticipated. On multi-row coils, starting from the coil
manifold end, construction consists of a section (slab) of
multi-row fins up to the coil bend and a section of single
row fins in and after the bend. The single row fins are held
apart by a piece of formed sheet metal acting as the end
support. This construction was adopted to make it
possible to clean the outdoor coil without removing the
roof of the unit. To thoroughly clean these coils the
following procedure can be used:
1. Ensure that power to the unit is turned “OFF”.
2. Remove the outdoor section access panel.
3. Remove small access panel on top of outdoor coil
section to expose the separated coils.
4. Straighten coil fins with fin rake if necessary.
5. Use a soft brush to remove base debris from both sides
of the coil.
6. The coil is now ready for the cleaning application: The
wash solution is best applied first in reverse direction
of the airflow by back flushing in a downward direction
and then in the direction of the airflow in a downflow
direction.
7. Washing the coil in a downward fashion through the
outdoor coil access panel opening located over the
separated coil fins will flush any debris from between
the rows of fin.
8. Turn power back on to the unit.
This procedure can be followed annually if needed to
maintain adequate condenser airflow. Chemicals
Required: High Quality Detergent.
Note:
If the detergent is strongly alkaline (more than
8.5 pH) after mixing, it must contain an inhibitor.
Suggested detergent brand is “COILOX” (part
number CHM00051).
Figure 25.
Gas port inspection
WARNING
Hazardous Chemicals!
Failure to follow this safety precaution could result in
death or serious injury. Coil cleaning agents can be
either acidic or highly alkaline and can burn severely if
contact with skin or eyes occurs. Handle chemical
carefully and avoid contact with skin. ALWAYS wear
Personal Protective Equipment (PPE) including goggles
or face shield, chemical resistant gloves, boots, apron
or suit as required. For personal safety refer to the
cleaning agent manufacturer’s Materials Safety Data
Sheet and follow all recommended safe handling
practices.
Pin Vise
#45 Drill
1“
Gas Manifold
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.
