GE Telaire Ventostat 8001, User Instructions

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Page 4 Telaire Ventostat™ 8000 Series
Setting 9 is intended for use in parking garages where
CO
2
can be used
as an indicator of the presence of combustion fumes. As part of most
types of combustion,
CO
2
is generated at a rate that is 50 times or more
than other, more harmful contaminants. This is particularly the case with
the extensive use of catalytic converters that tend to remove
most of the carbon monoxide from vehicle exhaust. The
700
ppm setting should maintain levels of other exhaust
contaminants well below levels of concern
.
Custom Settings
In addition to the nine standard settings programmed into the 8000 series
(see Table 2 above), users can also custom program the sensor for their
own application.
Outlined below is a brief description of each of the adjustable custom
settings:
Control Range - The range that will correspond to the analog signal
output range. The range consists of a low level and a high level in ppm .
Setting this range does not limit the actual measurement or display
range.
Analog Output Range - Can be expressed in V or mA. This range
will correspond to the range of CO
2
concentrations established in the
measurement range. The output in V or mA is selected based on the wir-
ing terminals. It is possible to simultaneously connect to both the V and
mA outputs.
Proportional or Exponential Control - Proportional (linear) control
increases the signal output in proportion to the increase in CO
2
concen-
trations for the measurement range and analog output range selected.
Exponential control provides an output function that is exponential over
the selected range of the sensor. The effect of the exponential output is to
initially introduce more ventilation to the space as concentrations are at
the lower level of the control range. The exponential output is particu-
larly useful for areas of potential high occupancy and high air volume
where significant time may be required for CO
2
levels to build up.
Potential applications include arenas, gyms, auditoriums and large con-
ference areas. Examples of both types of outputs appear in Figure 9 on
the next page
.
Relay Set Point - Establishes the level at which the on-board relay
will activate. The relay is a double pole single throw (DPST) relay that
allows the user to operate the relay normally open or normally closed
based on the selection of wiring terminals connected on the sub-base
.
Relay Hysteresis (Deadband) - Is the point at which the relay will
deactivate. It is entered as a ppm value below the setpoint. A sensor with
a relay setting of 1000 and a hysteresis of 50 would activate at
1000
ppm and deactivate at 950 ppm .
Table 2: Standard Settings Adjustable via Keypad UIP Interface
Setting
No.
Type of
Equipment
Type of
Output
Ventilation
Rate (cfm/
Person)
Analog
Output
CO2
Control
Range
(ppm)
Optional
Relay
Setpoint
(ppm)
Relay
Hysteresis
(ppm)
1 Interface w/Standard
Building Control
System
Proportional Any 0 - 10V
4 - 20 mA
0 - 2000 1000 50
2 Interface w/Standard
Building Control
System
Proportional Any 2 - 10V
7 - 20 mA
0 - 2000 1000 50
3 Interface w/Standard
Building Control
System
Exponential Any 0 - 10V
4 - 20 mA
0 - 2000 1100 50
4 Economizer (Hvac) Proportional 15 0 - 10V
4 - 20 mA
0 - 1100 1100 50
5 Economizer (Hvac) Proportional 20 0 - 10V
4 - 20 mA
0 - 900 900 50
6 Economizer (Hvac) Exponential 15 0 - 10V
4 - 20 mA
0 - 1100 1100 50
7 Economizer (Hvac) Exponential 20 0 - 10V
4 - 20 mA
0 - 900 900 50
8 Health & Safety Proportional NA 0 - 10V
4 - 20 mA
0 - 9999 5000 500
9 Parking/Air Intakes/
Loading Docks
Proportional NA 0 - 10V
4 - 20 mA
0 - 2000 700 50