Economi$Er Iv Control Modes - Bryant 551B Installation Instructions Manual

Single-package rooftop electric cooling units with optional electric heat
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EconoMi$er IV Control Modes

Determine the EconoMi$er IV control mode before set up of the
control. Some modes of operation may require different
sensors. (See Table 6.) The EconoMi$er IV is supplied from the
factory with a supply- -air temperature sensor and an outdoor- - air
temperature sensor. This allows for operation of the EconoMi$er
IV with outdoor air dry bulb changeover control. Additional
accessories can be added to allow for different types of
changeover control and operation of the EconoMi$er IV and unit.
Table 6—EconoMi$er IV Sensor Usage
ECONOMI$ER IV WITH OUTDOOR AIR
APPLICATION
APPLICATION
None. The outdoor air dry bulb sensor
Outdoor Air
Dry Bulb
Differential
Dry Bulb
Single Enthalpy
Differential
Enthalpy
CO
for DCV
2
Control using a
Wall-Mounted
CO
Sensor
2
CO
for DCV
33ZCSENCO2†
2
Control using a
and
Duct-Mounted
33ZCASPCO2**
CO
Sensor
2
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many
different base units. As such, these kits may contain parts that will not be
needed for installation.
† 33ZCSENCO2 is an accessory CO
** 33ZCASPCO2 is an accessory aspirator box required for duct-mounted
applications.
†† CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
8
7
LEGEND
DCV— Demand Controlled Ventilation
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
OAT — Outdoor-Air Temperature
POT — Potentiometer
RAT — Return-Air Temperature
DRY BULB SENSOR
Accessories Required
is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
33ZCSENCO2
O
CRCBDIOX005A00††
R
sensor.
2
FOR OCCUPANCY CONTROL
REPLACE JUMPER WITH
FIELD-SUPPLIED TIME CLOCK
Potentiometer Defaults Settings:
Power Exhaust
Middle
Minimum Pos.
Fully Closed
DCV Max.
Middle
DCV Set
Middle
Enthalpy
C Setting
Fig. 27 --- EconoMi$er IV Wiring
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory configured for
outdoor dry bulb changeover control. The outdoor- -air and
supply- -air temperature sensors are included as standard. For this
control mode, the outdoor temperature is compared to an
adjustable set point selected on the control. If the outdoor-air
temperature is above the set point, the EconoMi$er IV will adjust
the outdoor-air dampers to minimum position. If the outdoor air
temperature is below the set point, the position of the outdoor air
dampers will be controlled to provide free cooling using outdoor
air. When in this mode, the LED next to the free cooling set point
potentiometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located on
the control. (See Fig. 33.) The scale on the potentiometer is A, B,
C, and D. See Fig. 34 for the corresponding temperature
changeover values.
Differential Dry Bulb Control
For differential dry bulb control the standard outdoor dry bulb
sensor is used in conjunction with an additional accessory dry
bulb sensor (part number CRTEMPSN002A00). The accessory
sensor must be mounted in the return airstream. (See Fig. 35.)
Wiring is provided in the EconoMi$er IV wiring harness. (See
Fig. 27.)
In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower temperature
airstream is used for cooling. When using this mode of
changeover control, turn the enthalpy setpoint potentiometer fully
clockwise to the D setting. (See Fig. 33.)
NOTES:
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential
enthalpy or dry bulb.
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power
supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wire jumper
between P and P1 and set control minimum position POT to the minimum
position.
26
C06028

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