Gas Heat Exchanger Removal; Dx Cooling; Condenser Fans (6-25 And 30 Ton); Figure 23 - Gas Heat Exchanger - AAON RN SERIES Installation Operation & Maintenance

Gas Heat Exchanger Removal

WARNING
Electric shock hazard. Shut off all
electrical power to the unit to avoid
shock hazard or injury from rotating
parts.
DANGER
LEAK CHECK GAS PIPE
The gas pipe in the unit should be
checked for leaks before startup.
Leak checking is the responsibility of
the installing
connections should be checked for
leaks annually
Failure to leak check could result in
fire, explosion, or other hazardous
situations.
Removal
Disconnect all wiring on the heat exchanger.
Disconnect flex gas lines and pull out of the
way.
Remove screws around the perimeter of the
heat exchanger face plate that connect it to
the unit. Only the outermost screws should
be removed.
Pull the heat exchanger straight back and out
of the unit. It may be necessary to remove
some of the control door jambs.
Reinstallation
Ensure that the neoprene isolator is installed
around the perimeter of the heat exchanger.
Insert heat exchanger into opening so that
the back of the main plate is against the unit
bulkhead.
contractor. All
after installation.

Figure 23 - Gas Heat Exchanger

Attach the heat exchanger to the bulkhead
using the holes around the perimeter.
Connect flex gas lines to the piping on the
heat exchanger. If flexible gas piping in the
unit must be replaced connectors cannot be
reused, only new connectors must be used.
Connect wiring per the wiring diagram on
the controls compartment door.
Purge gas lines to the gas valves at the unit.

DX Cooling

Set unit controls to cooling mode of
operation with supply fans on. Check the fan
for correct operating direction, amperage
and voltage. Check compressor operation,
rotation, amperage and voltage to the unit
nameplate (check the amperage on the load
side of the compressor contactor).

Condenser Fans (6-25 and 30 ton)

Condenser fans and motors can be removed
and reinstalled as individual assemblies.
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