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2. Disconnect the supply-air sensor from termimds T and
TI.
3. Ensure that file factory-installed jumper is in place across
terminals P and PI. If remote damper positioning is being
used, make sure that file tenninals are wired according to
Fig. 35 and that the minimum position potentiometer is
turned fully clockwise.
4. Connect 24 vac across terminals TR and TRI.
5. Carefiflly adjust the minimum position potentiometer
until the measured mixed-air temperature matches the
c_dculated value.
6. Reconnect the supply-air sensor to terminals T and TI.
Remote control of the EconoMiSerIV damper is desilable
when requiring additional tempormy ventilation. If a
field-supplied remote potentiometer (Honeywell part number
$963B1128) is wired to the EconoMiSerIV controllek the min-
imum position of the damper can be controlled from a remote
location.
To control the minimum damper position lemotely, remove
the factory-installed jumper on the P and Pl terminals on the
EconoMi$erIV controllec Wire the field-supplied potentiolne-
ter to the P and Pl terminals on the EconoMiSerIV controllec
See Fig. 41.
Damper Movement -- Damper movement from full open to
full closed (or vice velsa) takes 21/2 minutes.
Thermostats -- The EconoMiSerIV control works with con-
ventional thermostats that have a YI (cool stage 1), Y2 (cool
stage 2), WI (heat stage 1), W2 (heat stage 2), _mdG (fan). The
EconoMiSerIV control does not support space temperature
senso_.s. Connections are made at the thermostat terminal con-
nection board located in the main control box.
Occupancy Control -- The factory default configuration for
the EconoMiSerIV control is occupied mode. Occupied status
is provided by the red jumper from terminal 9 to terminal 10 on
TB2. When unoccupied mode is desired, install a field-
supplied timeclock fimction in place of the jumper between ter-
minals 9 and 10 on TB2. See Fig. 35. When the timeclock
contacts me closed, file EconoMiSer[V control will be in
occupied mode. When the timeclock contacts are open (remov-
ing the 24-v signal from termimd N), the EconoMiSerlV will
be in unoccupied mode.
Demand Controlled Ventilation (DCV) -- When using the
EconoMiSerlV for demand controlled ventilation, there me
some equipment selection criteria which should be considered.
When selecting the heat capacity and cool capacity of the
equipment, the maximum ventilation rate must be evaluated for
design conditions. The maximum damper position must be c_d-
culated to provide the desired fresh ail:
Typically file maximum ventilation rate will be about 5 to
10% more than the typical cfm required per pel.son, using
normal outside air design criteria.
A proportional anticipatory strategy should be taken with
the following conditions: a zone with a large area, varied occu-
pancy, and equipment that cannot exceed the required ventila-
tion rate at design conditions. Exceeding the required ventila-
tion rate means the equipment can condition air at a maximum
ventilation rate that is greater than the required ventilation rate
for maximum occupancy. A proportional-anticipatory strategy
will cause file fresh air supplied to increase as the room COz
level increases even though the CO2 set point has not been
reached. By the time the CO2 level reaches the set point, the
dmnper will be at maximum ventilation and should maintain
the set point.
In order to have the CO2 sensor control the economizer
dmnper in this manner, first determine the damper voltage out-
put for minimum or base ventilation. Base ventilation is the
ventilation required to remove contmninants during unoccu-
pied periods. Tile following equation may be used to determine
the percent of outside-air entering the building for a given
damper position. For best results there should be at least a
10 degree difference in outside and return-air temperatures.
OA RA
(To x l---ff_) + (TR x _ ) = TM
To = Outdoor-Air Temperature
OA = Percent of Outdoor Air
TR= Return-Air Telnperature
RA = Percent of Return Air
TM= Mixed-Air Temperature
Once base ventilation has been determined, set the mini-
mum damper position potentiometer to the correct position.
The same equation can be used to determine the occupied or
maximum ventilation rate to the building. For example, an out-
put of 3.6 volts to the actuator provides a base ventilation rate
of 5% and an output of 6.7 volts provides the maximum venti-
lation rate of 20% (or base plus 15 cfm per person). Use Fig. 42
to determine the maximum setting of file CO2 sensoc For ex-
ample, a 1100 ppm set point relates to a 15 cfm per person de-
sign. Use the 1100 ppm curve on Fig. 42 to find the point when
the CO2 sensor output will be 6.7 volts. Line up the point on the
graph with the left side of the chart to determine that the range
configuration for the CO2 sensor should be 1800 ppm. The
EconoMiSerIV controller will output the 6.7 volts fiom the
CO2 sensor to the actuator when the CO__concentration in the
space is at 1100ppm. The DCV set point may be left at 2 volts
since the CO2 sensor voltage will be ignored by the
EconoMiSerIV controller until it rises above the 3.6 volt setting
of the minimum position potentiomete_:
Once the fully occupied dmnper position has been deter-
mined, set file maximum dmnper demand control ventilation
potentiometer to this position. Do not set to the maximum posi-
tion as this can result in over-ventilation to the space and poten-
tial high-humidity levels.
CO2_Sensor Configuration -- The CO2 sensor has preset
standard voltage settings that can be selected anytime after the
sensor is powered up. See Table 13.
Use setting 1or 2 for Carrier equipment. See Table 13.
1. Press Clear and Mode buttons. Hold at least 5 seconds
until the sensor enters the Edit mode.
2. Press Mode twice. The STDSET Menu will appear
3. Use the Up/Down button to select the preset numbel: See
Table 13.
4. Press Enter to lock in file selection.
5. Press Mode to exit and resume norm_d operation.
The custom settings of the CO2 sensor can be changed any-
time after the sensor is energized. Follow the steps below to
change file non-stan&trd settings:
1. Press Clear and Mode buttons. Hold at least 5 seconds
until the sensor enters the Edit mode.
2. Press Mode twice. The STDSET Menu will appem:
3. Use the Up/Down button to toggle to the NONSTD menu
and press Entel:
4. Use the Up/Down button to toggle through each of the
nine variables, starting with Altitude, until file desired set-
ting is reached.
5. Press Mode to move through the variables.
6. Press Enter to lock in the selection, then press Mode to
continue to the next vmiable.
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