Trane Voyager Commercial - Exhaust Fan and Economizer Damper Operation; Exhaust Fan Operation and Adjustments

RT-SVX34R-EN
83
Exhaust Fan Operation
To start the optional power exhaust fans, use the
economizer test procedures in , p. 68 - Table 46, p. 74
to drive the economizer dampers to the open position.
The exhaust fans will start when the damper position is
equal to or greater than the exhaust fan setpoint. If
optional power exhaust is selected, an access door
must be field-installed on the horizontal return
ductwork to provide access to exhaust fan motors.
The exhaust fan will start anytime the economizer
damper position is equal to or greater than the exhaust
fan setpoint.
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Verify that the fans are operating properly and the CFM
is within the job specifications. Refer to power exhaust
fan performance tables beginning with Table 53, p. 83
for the exhaust fan performance characteristics.
Available power adjustments:
• The power exhaust fan(s) comes on based on the
position of the of the exhaust fan setpoint
potentiometer on the RTOM (Reliatel Options
Module). The setpoint is factory set at 25%. The
exhaust fan(s) will come on anytime the
economizer damper position is equal to or greater
than the active exhaust fan setpoint.
• Physical damper blade stops limit the amount of
exhaust airflow by limiting the maximum opening
of the damper blades. These stops (sliding brackets
secured with wing-nuts) are present under the rain
hood on the non-modulating power exhaust option.
There is one stop on each side of each damper. The
practical range of blade position control is between
1.5" and 4.0" blade opening. The damper is wide-
open at 4.0". The stops on each side of a damper
must be in the same position, such that the damper
blade connecting member contacts the stops at the
same time.
• The modulating power exhaust actuator tracks the
position of the economizer damper actuator such
that the power exhaust dampers proportionally
follow or track the fresh air damper position.
• When the Statitrac option is selected, the exhaust
actuator will operate independently of the
economizer in order to relieve positive building
pressure. If a Space Pressure Transducer failure
occurs, the unit will revert back to fresh air tracking
control.
• The proportional offset between the dampers is
adjustable. With direct-drive ultra-low-leak exhaust
options, actuator stroke can be adjusted as
described in “Economizer (O/A) Dampers,” p. 84.
The stroke limit can be set between 33% and 100%
of full stroke.
NNoottee:: The barometric damper continues to function as
a pressure relief damper up to the maximum
stop position.
To adjust the damper blade stops, refer to figure
, p. 83 to Figure 57, p. 84.
If the fan speed needs to be changed from the current
operating speed, refer to the unit wiring diagram and
the XTB1 and XTB2 terminal strip located in the
economizer section.
Table 53. Power exhaust fan performance— 27.5-35
Ton — 60 Hz
Return
Duct Static
(in. wc)
Power Exhaust Selection
50% (min) 100% (max)
Damper Blade Open Distance (in.)
(min) (max) (min) (max)
CFM
0.0 3812 6866 7624 13742
0.1 3497 5296 6995 10591
0.2 3190 4458 6325 9000
0.3 2884 3812 5768 7635
0.4 2621 3359 5241 6719
0.5 2342 2885 4683 5771
Table 54. Power exhaust fan performance — 40-50
Ton — 60 Hz
Return Duct
Static (in.
wc)
Power Exhaust Selection
50% (min) 100% (max)
Damper Blade Open Distance (in.)
(min) (max) (min) (max)
CFM
0.0 4854 8035 9708 16069
0.1 4575 7410 9151 14820
0.2 4262 6450 8552 13496
0.3 4011 6027 8021 12054
0.4 3718 5526 7436 11051
0.5 3467 5186 6933 10373
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