FLOW IN CUBIC FEET PER MINUTE (cfm)
2500
2000
1500
1000
500
0
0.05 | 0.15 | 0.25 |
STATIC PRESSURE (in. wg)
7 1/2 - 12 1/2 Ton
Differential Dry Bulb Changeover
The control supports differential dry bulb changeover con- trol. This requires an accessory return air temperature sensor CRTEMPSN001A00 installed in the return air- stream. Refer to the
Outdoor Air Enthalpy Changeover
The control supports outdoor air enthalpy changeover control. This mode requires a
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| Fig. 23 — Barometric Flow Capacity | |||||||
(cfm) | 30 |
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MINUTE |
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25 |
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PER | 20 |
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15 |
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FEET |
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10 |
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CUBICIN |
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0 |
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| 5 |
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FLOW | 0.13 | 0.20 | 0.22 | 0.25 | 0.30 | 0.35 | 0.40 | 0.45 | 0.50 |
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| STATIC PRESSURE (in. wg) |
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Fig. 24 — Outdoor-Air Damper Leakage
sensor (OAT) and an accessory outdoor air humidity sensor (ORH) (part no. CRHUMDSN001B00). Refer to the
Differential Enthalpy Changeover
The control supports differential enthalpy changeover con- trol. This requires the
D. Damper Movement
(cfm) | 6000 |
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MINUTE | 5000 |
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4000 |
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PER |
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3000 |
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FEET |
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2000 |
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CUBIC |
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1000 |
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IN |
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FLOW | 0 |
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0.05 | 0.10 | 0.15 | 0.20 | 0.25 | 0.30 | 0.35 | |
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STATIC PRESSURE (in. wg)
7
When the EconoMi$er+ board receives initial power, it will take the damper up to 21/2 minutes before it begins to posi- tion itself. After the initial positioning, subsequent changes to damper position will take up to 30 seconds to initiate. Damper movement from full open to full closed (or vice versa) takes 21/2 minutes.
If the damper is in the process of changing positions (for example it is trying to open to 100%) and the fan signal is turned off, the damper will continue to its 100% open posi- tion before closing.
Fig. 25 — Return-Air Pressure Drop
C. EconoMi$er+ Control Mode
Determine the EconoMi$er+ control mode before installing sensors and accessories. Different sensors are required for different control modes, and a number of accessories are available. Refer to Tables 3 and 4.
Outdoor Dry Bulb Changeover
The standard control mode for the EconoMi$er+ is Outdoor Dry Bulb Changeover. The outdoor air and supply air tem- perature sensors are also included as standard. EconoMi$er+ control is based on the outdoor temperature relative to a set point in the software. If the
NOTE: Occupied minimum position can not be set lower than +1% higher than the value of IAQ minimum economizer posi- tion. Refer to the setup examples on page 56.
E. EconoMi$er+ Controller Wiring
The EconoMi$er+ is supplied from the factory with a supply air temperature sensor and an outside air temperature sensor. This allows for operation of the EconoMi$er+ with outdoor air dry bulb changeover control. Additional accesso- ries can be added to allow for different types of change over control and operation of the EconoMi$er+ and unit.
F. Thermostats
The EconoMi$er+ control works with conventional thermo- stats 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+ control does not support sensor thermostats like the T56 and T57. Connections are made at the thermostat terminal con- nection board located in the main control box.
