UV-PRC001-EN 5
Sampling Chamber (Option)
A sampling chamber is provided
for housing the room air sensor
whenever a unit mounted sensor
is specified for TUC or Tracer
ZN520 controls. The sampling
chamber is placed below the air-
coil where room air is continuous-
ly drawn into the chamber before
being tempered by the coil. This
ensures an accurate response to
temperature changes in the room.
See Figure 4 for sampling
chamber.
Filter
Standard units are equipped with
a single 1-inch thick filter that is ac-
cessible without removal of the
unit front panel. Units containing
dynamic air require front panel re-
moval for filter access. See Figure
5 for vertical filter removal. Fil-
ter options include throw-away
and permanent renewable.
OA/RA Dampers
Trane unit ventilators are
equipped with dual blade type
mixing dampers to ensure proper
modulation and mixing of return
and outdoor air designed in accor-
dance to ARI 840. A splitter is
placed between the damper
blades to separate the fresh-air
and return-air compartments to
prevent blow-thru.
An ultra low-leak damper seal is
applied on all vertical unit configu-
rations. The seal consist of a medi-
um density, closed-cell neoprene
material. The seal is fixed and not
part of the damper assembly. The
outside-air damper closes into the
closed cell neoprene material,
providing a positive pressure seal.
See Figure 6 for OA/RA damp-
er with splitter and seal.
OA/RA Actuator
(Option)
The OA/RA actuator provides true
spring return operation for posi-
tive close-off of the OA/RA damp-
ers. The spring return system of
the actuator closes the outside
damper if power is lost to the
building. When ordered with fac-
tory mounted controls, the actua-
tor is 3-point floating. A 2 to 10
VDC actuator is also available
when other than Trane controls is
required. Table 1 for technical
data of the OA/RA actuator.
See Page 7 for percentage of ven-
tilation on each system.
Table 1: Technical data for OA/RA
actuator
Power Supply
24 VAC ± 20% 50/60 HZ
24 VAC ± 10%
Power
Consumption
Running: 2.5 W
Holding: 1 W
Tranformer
Sizing
5 VA (class 2-power source)
Overload
Protection
Electronic throughout 0 to
95-degree rotation
Control Signal 2 to 10 VDC
3-point floating with Trane controls
Angle of
Rotation
Maximum 95-degree
Adjustable with mechanical stop
Torque 35-inch/lb
Direction of
Rotation
Spring return reversible with CW/
CCW mounting
Position
Indication
Visual indicator, 0 to 95-degrees
Run Time
(nominal)
90-second constant (independent
of load)
Noise Level Running: 30 dB
Features and
Benefits
Figure 4: Sampling chamber
Figure 5: Vertical filter removal
Figure 6: OA/RA splitter
and seal
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