72
seal and wheel. Racking of the unit or
cassette during installation, and/or mounting
of the unit on a non-level support or in other
than the factory orientation can change seal
clearances. Tight seals will prevent rotation.
Figure 41 - Cross Section of Air Seal
Structure
Wheel to Air Seal Clearance
To check wheel to seal clearance; first
disconnect power to the unit, in some units
the energy recovery wheel assembly can be
pulled out from the cabinet to view the air
seals. On larger units, the energy recovery
wheel may be accessible inside the walk-in
cabinet.
A business card or two pieces of paper can
be used as a feller gauge, (typically each
.004” thick) by placing it between the face
of the wheel and pile seal.
Using the paper, determine if a loose slip fit
exist between the pile seal and wheel when
the wheel is rotated by hand.
To adjust air seal clearance, loosen all seal
plate retaining screws holding the separate
seal retaining plates to the bearing support
channels and slide the seals plates away
from the wheel. Using the paper feeler
gauge, readjust and retighten one seal plate
at a time to provide slip fit clearance when
the wheel is rotated by hand.
Confirm that the wheel rotates freely. Apply
power to the unit and confirm rotation.
Airflow Balancing and Checking
High performance systems commonly have
complex air distribution and fan systems.
Unqualified personnel should not attempt to
adjust fan operation, or air circulation, as all
systems
have
unique
operations
characteristics. Professional air balance
specialists should be employed to establish
actual operating conditions, and to configure
the air delivery system for optimal
performance.
Controls
A variety of controls and electrical
accessories may be provided with the
equipment. Identify the controls on each unit
by consulting appropriate submittal, or order
documents, and operate according to the
control manufacturer’s instructions. If you
cannot locate installation, operation, or
maintenance information for the specific
controls,
then
contact
your
sales
representative, or the control manufacturer
for assistance.
Routine Maintenance and Handling
Handle cassettes with care. All cassettes
should be lifted by the bearing support
beam. Holes are provided on both sides of
the bearing support beams to facilitate
Do not alter factory wiring. Deviation
from the supplied wiring diagram will
void all warranties, and may result in
equipment
damage
or
personal
injury. Contact the factory with wiring
discrepancies.
WARNING
Summary of Contents for M2 Series
Page 2: ......
Page 5: ...5 Split System Piping Diagrams 98 M2 Series Startup Form 115 Maintenance Log 121 ...
Page 35: ...35 Table 1 Electric and Gas Heating Capacities ...
Page 38: ...38 Figure 5 M2 Series Unit Four Point Lifting ...
Page 39: ...39 Figure 6 M2 Series Unit Eight Point Lifting ...
Page 58: ...58 Figure 32 Supply Fan Banding ...
Page 95: ...95 Figure 52 Filter Layout Viewed from the Upstream Side of the Cooling Coil ...
Page 98: ...98 Split System Piping Diagrams Figure 53 A C Split System Piping Suction Down ...
Page 99: ...99 Figure 54 A C Split System Piping Suction Up ...
Page 100: ...100 Figure 55 A C with LAC Split System Piping Suction Up ...
Page 101: ...101 Figure 56 A C with Modulating Hot Gas Reheat Split System Piping Suction Down ...
Page 102: ...102 Figure 57 A C with Modulating Hot Gas Reheat Split System Piping Suction Up ...
Page 103: ...103 Figure 58 A C with Hot Gas Bypass Split System Piping Suction Down ...
Page 104: ...104 Figure 59 A C with Hot Gas Bypass Split System Piping Suction Up ...
Page 107: ...107 Figure 62 Heat Pump Split System Piping Suction Down ...
Page 108: ...108 Figure 63 Heat Pump Split System Piping Suction Up ...
Page 109: ...109 Figure 64 Heat Pump with Modulating Hot Gas Reheat Split System Piping Suction Down ...
Page 110: ...110 Figure 65 Heat Pump with Modulating Hot Gas Reheat Split System Piping Suction Up ...
Page 111: ...111 Figure 66 Heat Pump with Hot Gas Bypass Split System Piping Suction Down ...
Page 112: ...112 Figure 67 Heat Pump with Hot Gas Bypass Split System Piping Suction Up ...