Specifications

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8 PLACES ON 020 0_
_9 PLACES O_ 628
_s Et_CHS_E
Fig. 10- Wind Baffle Dimensions
Indoor Air Quality (IAQ) -- The (7omfbrtLinkTM con-
trol has the capability for several methods of demand ventila-
tion control, hldoor air quality is typically measured using a
CO2 sensor whose measurelnents are displayed in parts per mil-
lion (ppm). Outdoor air quality may be measured with a CO2
sensor for indoor-outdoor differential demand ventilation
control, or with other sensor types for the outdoor air lockout
function. The factory-installed indoor air quality CO2 sensor is
mounted in the return section. A field-installed indoor air
quality CO2 sensor may be mounted in the retum or directly in
the occupied space, per job requirements. The indoor air quality
modes of operation can be afl_cted by configurations for iMoor
air quality sensor (Conftguration-+AIR. Q-+IA. CF), indoor air
quality switch ((bnfiguration-+AIR.Q-+IZCF), outdoor air
quality sensor (Configuration-+AIR.Q_OA.CF) and other
related fan madlimit configurations as described below.
IAQ (Analog Input) The ComfbrtLink TM control is config-
ured tbr indoor air quality sensors which provide 4 to
20 mA for 0 to 2000 ppm. If a sensor has a diflhent range,
the ppm display range must be reconfigured by entering new
values for (bnfiguration-+AIR.Q-+L4M and (bnfigura-
tion -+AIR. Q -+L2OM.
IA. (T = 0 (No IAQ) IA. (T = 0 signifies that there is
no IAQ sensor installed. The damper will operate at the
Configumtion-+AIR.Q-+ECMN position when the space is
occupied and the indoor t_aaais on.
1A. CF = 1 (DCV) When Lt.(T = 1, the IAQ algoritban is
set tbr Demand Control Ventilation (DCV). During DCV, the
damper modulates between two user confignrations depending
upon the relationship bewveen the IAQ and the Outdoor Air
Quality (OAQ). The lower of these two positions is referred to
as the Minimmn IAQ Damper Position (Configuration
-+AIR.Q-+AQ.MN) while the higher is referred to as Econo-
mizer Minhnum Position (ECMN). The AQ.MN should be set
to an economizer position that brings in enough fiesh air to
relnove contaminants and CO 2generated by sources other than
people. The ECMN should be set to an economizer position
that brings in enough flesh air to remove contaminants and
CO2 generated by all sources including people. The ECMN
value is the design value for maximum occupancy.
The ComJbrtLink control will begin to open the damper
tiom theAQ.MNposition when the IAQ level begins to exceed
the Outdoor Air Quality (OAQ) level by a configurable
mnount. This amount is referred to as AQ Differential Low
((bnfiguration-+AIR.Q-+AQD.L). When the differential
between IAQ and OAQ reaches AQ Differential High
((bnfiguration-+AIR.Q-+AQD.H), the economizer position
will be ECMN. When the IAQ/OAQ difl'erential is between
AQD.L and AQD.H, the control will modulate the damper
bewveen AQ.MN and EC.MN in a linear manner as shown in
Fig. 11. The damper position wilt never exceed the bounds
specified by AQ.MN and EC.MN during IAQ control.
IA.(T = 2 (Override IAQ) When IA.(T = 2, the IAQ
algorithm maintains the damper at (bnfiguration
-+AIR.Q-+ECMN until the override condition triggers. The
override triggers when the IAQ/OAQ differential is reeater
than Configumtion-+AIR.Q-+AQD.H. The override position
is Configuration-+AIR.Q_OVR.P (Economizer Override
Position). The economizer position will return to ECMN
when the IAQ/OAQ differential is less than (bnfiguration
-+AIR. Q-+A QD.L .
The Override algorithm will operate whenever the building
is occupied and the indoor tan is operating or whenever the
IAQ algoritban has caused the indoor tan to operate. The
configuration IA.FN determines whether or not the IAQ atgu-
rithm can turn on the indoor fan.
If the indoor tan is not operating, the economizer position
will be zero. If the oven-ide is not active and the building
is unoccupied, the economizer position will be zero.
The damper position may exceed (bnfigumtion-+AIR.Q
49