551B,C

EconoMi$er IV Control Modes

 

 

 

 

 

 

Outdoor Dry Bulb Changeover

Determine the EconoMi$er IV control mode before set up of the

The standard controller is shipped from the factory configured for

control. Some modes of operation may require different

outdoor dry bulb changeover control. The outdoor-air and

sensors. (See Table 6.) The EconoMi$er IV is supplied from the

supply-air temperature sensors are included as standard. For this

factory with a supply-air temperature sensor and an outdoor- air

control mode, the outdoor temperature is compared to an

temperature sensor. This allows for operation of the EconoMi$er

adjustable set point selected on the control. If the outdoor-air

IV with outdoor air dry bulb changeover control. Additional

temperature is above the set point, the EconoMi$er IV will adjust

accessories can be added to allow for different types of

the outdoor-air dampers to minimum position. If the outdoor air

changeover control and operation of the EconoMi$er IV and unit.

temperature is below the set point, the position of the outdoor air

 

 

 

 

 

 

 

 

 

dampers will be controlled to provide free cooling using outdoor

Table 6—EconoMi$er IV Sensor Usage

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

 

ECONOMI$ER IV WITH OUTDOOR AIR

 

 

 

 

the control. (See Fig. 33.) The scale on the potentiometer is A, B,

APPLICATION

 

DRY BULB SENSOR

 

 

 

Accessories Required

 

 

C, and D. See Fig. 34 for the corresponding temperature

Outdoor Air

None. The outdoor air dry bulb sensor

 

 

changeover values.

Dry Bulb

 

is factory installed.

 

Differential Dry Bulb Control

Differential

 

CRTEMPSN002A00*

 

 

 

 

 

 

Dry Bulb

 

 

For differential dry bulb control the standard outdoor dry bulb

 

 

 

 

 

 

 

 

Single Enthalpy

 

 

HH57AC078

 

 

sensor is used in conjunction with an additional accessory dry

 

 

 

HH57AC078

 

 

Differential

 

 

 

bulb sensor (part number CRTEMPSN002A00). The accessory

 

 

 

 

and

 

 

Enthalpy

 

 

 

 

 

sensor must be mounted in the return airstream. (See Fig. 35.)

 

CRENTDIF004A00*

 

 

 

 

 

Wiring is provided in the EconoMi$er IV wiring harness. (See

CO2 for DCV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 27.)

Control using a

 

33ZCSENCO2

 

 

Wall-Mounted

 

 

In this mode of operation, the outdoor-air temperature is

 

 

 

 

 

 

 

 

CO2 Sensor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

compared to the return-air temperature and the lower temperature

CO2 for DCV

33ZCSENCO2†

 

O

 

 

 

 

Control using a

and

 

 

 

CRCBDIOX005A00††

 

 

airstream is used for cooling. When using this mode of

 

 

 

 

 

Duct-Mounted

33ZCASPCO2**

 

R

 

 

 

 

changeover control, turn the enthalpy setpoint potentiometer fully

CO2 Sensor

 

 

 

 

 

 

 

 

 

 

 

clockwise to the D setting. (See Fig. 33.)

 

 

 

 

 

 

 

 

 

*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.

2sensor.

**33ZCASPCO2 is an accessory aspirator box required for duct-mounted applications.† 33ZCSENCO2 is an accessory CO

††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 and 33ZCASPCO2 accessories.

FOR OCCUPANCY CONTROL

REPLACE JUMPER WITH

FIELD-SUPPLIED TIME CLOCK

8

7

LEGEND

Potentiometer Defaults Settings:

DCV— Demand Controlled Ventilation

Power Exhaust

Middle

Minimum Pos.

Fully Closed

IAQ — Indoor Air Quality

DCV Max.

Middle

LA — Low Ambient Lockout Device

DCV Set

Middle

OAT — Outdoor-Air Temperature

Enthalpy

C Setting

POT — Potentiometer

 

 

RAT — Return-Air Temperature

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.

C06028

Fig. 27 ---EconoMi$er IV Wiring

26

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Image 26
Bryant 551B, 551C EconoMi$er IV Control Modes Outdoor Dry Bulb Changeover, EconoMi$er IV Sensor Usage
Page 25 Page 27

551C, 551B specifications

The Bryant 551B and 551C are two highly efficient air conditioning units designed to provide optimal comfort in residential settings. Known for their reliability and performance, these models are part of Bryant's esteemed line of heating and cooling solutions.

One of the standout features of the Bryant 551B is its two-stage cooling system, which allows for better humidity control and increased comfort. This ensures that homeowners can enjoy consistent temperatures while reducing energy consumption. The unit operates quietly, thanks to its noise-reducing technology, making it an ideal choice for bedrooms and living spaces.

On the other hand, the Bryant 551C builds upon this foundation with its variable-speed compressor. This technology allows the unit to adjust its cooling output according to the specific needs of the home. This results in seamless operation and even greater energy efficiency. Both models also incorporate Bryant's advanced control capabilities, which allow users to monitor and adjust settings remotely via smart devices, adding a layer of convenience and modernity to home climate control.

With an emphasis on durability, both the 551B and 551C feature a galvanized steel cabinet that protects against weather-related damage. The powder coat finish further enhances their resistance to rust and corrosion, ensuring a long lifespan and minimal maintenance.

Another significant characteristic of these units is their excellent Seasonal Energy Efficiency Ratio (SEER) ratings. The 551B boasts a SEER rating of up to 16, while the 551C takes it even further with ratings exceeding 20. This efficiency not only translates to lower energy bills for homeowners but also contributes to a reduced carbon footprint, making these units environmentally friendly options.

Both models are also designed to operate with eco-friendly refrigerants, aligning with modern energy standards and regulations aimed at reducing greenhouse gas emissions.

In summary, the Bryant 551B and 551C are exemplary choices for homeowners looking for reliable, efficient, and high-performing air conditioning solutions. With features such as two-stage and variable-speed compressors, advanced smart technology, and robust construction, these models stand out in the competitive HVAC market. They promise a comfortable indoor environment along with significant energy savings, making them a wise investment for the future.
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