AAON RL-240 - Manual (Page 45)

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Figure 29 - Closed Back Draft Damper
The back draft damper will remain open
with no back pressure on the damper (see
Figure 30). The damper will close
completely when back pressure is applied.
Figure 30 - Open Back Draft Damper
Filters
Do not operate the unit without filters in
place. Unit should be checked for correct
filter placement during startup. Operation of
the equipment without filters will result in
clogged cooling and heating coils.
Cartridge Filter Installation
Cartridge filters may be held in their proper
orientation and placement with channels,
spring fasteners, or clips.
Figure 31 - Top Clip and Side Spring Fastener
Securing Filters in Place
Adjusting Refrigerant Charge
Adjusting the charge of a system in the field
must be based on determination of liquid
sub-cooling and evaporator superheat. On a
system with a TXV liquid sub-cooling is
more representative of the charge than
evaporator superheat but both measurements
must be taken.
Before Charging
Unit being charged must be at or near full
load conditions before adjusting the charge.
Units equipped with hot gas reheat must be
charged with the hot gas reheat valves
closed while the unit is in cooling mode to
Before completing startup and
leaving the unit a complete operating
cycle should be observed to verify
that all components are functioning
properly.
CAUTION
The Clean Air Act of 1990 bans the
intentional venting of refrigerant
(CFC’s and HCFC’s) as of July 1,
1992. Approved methods of recovery,
recycling or reclaiming must be
followed. Fines and/or incarceration
may be levied for non-compliance.
CAUTION