Once the filter drier core has been replaced, the
filter drier section should be evacuated via the
Schrader® access valve located next to the filter/
drier prior to opening the ball valves and restoring
the unit to normal operation.
WARNING
Never shut the discharge valve while the unit is
running. Doing so could rupture the discharge line or
components, resulting in death or serious injury.
CAUTION
Never close the suction line ball valve with the
compressor running. Doing so will cause the
compressor to pump down into a vacuum an damage
the compressor due to internal arcing.
Energy recovery wheel
Inspect the ERW at yearly intervals to verify that
the wheel, motor, belt, and segments are in good
working order.
Clean the segments at the manufacturer
recommended frequency specified in Table 61.
Table 61: Cleaning Frequency
Air class
1
Frequency
Class 1 - Clean air
Every 8–10 years
Class 2 - Moderately
clean air
Every 4–6 years
Class 3 - Dirty air
Every 1–2 years
Class 4 - Contaminated
air
NA
2
Note:
1. Air class is based on ASHRAE 62.1-2016
classifications.
2. For Class 4, the manufacturer
recommends inspecting and cleaning
once or twice per year to maintain
optimal performance.
CAUTION
Do not use acid based cleaners, aromatic solvents,
temperatures in excess of 170.0°F (76.6°C), or steam
to clean the ERW segments.
Follow these recommended cleaning procedures
when cleaning is required:
•
For a buildup of dry contaminants, brush
or vacuum both sides of each segment to
remove debris.
•
For other contaminant buildup:
- Soak the segment overnight in a
5% solution of a non-acid based
coil cleaner. After soaking, rinse the
segments until the water runs clear,
and drain any excess water before
reinstallation (highly recommended
option).
- Run water from a hose through the
removed segment while brushing it.
-
Note:
Slight discoloration of
the ERW segments that remains
after cleaning does not affect the
performance of the wheel.
Remove the wheel holder supports
Unscrew two bolts at the bottom (Figure 67) and
one bolt at the top (Figure 68) to remove the
supports on either side (Figure 69).
Figure 67: Bottom wheel holder support bolts
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
101
Tempmaster
