Bryant 580F - Manual (Page 20)

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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 outdoor-air tem-
perature is above the set point then the EconoMi$er should
be in minimum position. If the outdoor-air temperature is
below the set point, the position should be controlled to
maintain the leaving air temperature set point. The set point
range is 45 to 70 F.
Differential Dry Bulb Changeover
The control supports differential dry bulb changeover con-
trol. This requires an accessory return air temperature
sensor CRTEMPSN001A00 installed in the return air-
stream. Refer to the Start-up section for details on how to
configure and enable the control mode. The user can check
the operation of the sensor using the Read function.
Outdoor Air Enthalpy Changeover
The control supports outdoor air enthalpy changeover control.
This mode requires a factory-supplied outdoor air temperature
sensor (OAT) and an accessory outdoor air humidity sensor
(ORH) (part no. CRHUMDSN001B00). Refer to the Start-Up
section for details on how to configure and enable the control
mode. The user can check the operation of the sensors using
the Read function.
Differential Enthalpy Changeover
The control supports differential enthalpy changeover con-
trol. This requires the factory-supplied outdoor air tempera-
ture sensor, an accessory outdoor air humidity sensor, an
accessory return air temperature sensor, and an accessory
indoor air humidity sensor. Refer to the Start-Up section for
details on how to configure and enable the control mode. The
user can check the operation of the sensors using the Read
function.
D. Damper Movement
When the EconoMi$er+ board receives initial power, it will
take the damper up to 2
1 /
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 2
1 /
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.
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.
0
500
1000
1500
2000
2500
0.05 0.15 0.25
STATIC PRESSURE (in. wg) FLOW
IN
CUBIC
FEET
PER
M
INUTE
(cfm)
7 1/2 - 12 1/2 Ton
0
5
10
15
20
25
30
0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50
7 1/2-12 1/2 Ton
STATIC PRESSURE (in. wg)
FLOW
IN
CUBIC
FEET
PER
MINUTE
(cfm)
0
1000
2000
3000
4000
5000
6000
0.05 0.10 0.15 0.20 0.25 0.30 0.35
7 1/2-12 1/2 Ton
STATIC PRESSURE (in. wg)
FLOW
IN
CUBIC
FEET
PER
MINUTE
(cfm)
Fig. 23 — Barometric Flow Capacity
Fig. 24 — Outdoor-Air Damper Leakage
Fig. 25 — Return-Air Pressure Drop