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To control the minimum damper position remotely, remove the
Damper Movement
Damper movement from full open to full closed (or vice versa) takes 21/2 minutes.
Thermostats
The EconoMi$er IV control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.
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| 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 |
DEGREES FAHRENHEIT
C06035
Fig. 36 --- Outside Air Temperature
Changeover Set Points
Occupancy Control
The factory default configuration for the EconoMi$er IV control is occupied mode. Occupied mode is provided by the black jumper from terminal TR to terminal N. When unoccupied mode is desired, install a
Typically the maximum ventilation rate will be about 5 to 10% more than the typical cfm required per person, using normal outside air design criteria.
Demand Controlled Ventilation (DCV)
When using the EconoMi$er IV for demand controlled ventilation, there are 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 calculated to provide the desired fresh air.
A proportional anticipatory strategy should be taken with the following conditions: a zone with a large area, varied occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding the required ventilation rate means the equipment can condition air at a maximum ventilation rate that is greater than the required ventilation rate for maximum occupancy. A
In order to have the CO2 sensor control the economizer damper in this manner, first determine the damper voltage output for minimum or base ventilation. Base ventilation is the ventilation
581B,C
ECONOMI$ER IV |
ECONOMI$ER IV CONTROLLER
GROMMET
required to remove contaminants during unoccupied periods. The following equation may be used to determine the percent of
(TO x 100OA ) + (TR x 100RA ) =TM
RETURN AIR TEMPERATURE
SENSOR
RETURN DUCT
C06036
Fig. 37 --- Return Air Temperature or Enthalpy
Sensor Mounting Location
TO =
Once base ventilation has been determined, set the minimum damper position potentiometer to the correct position.
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