MODEL

PLUG

UTILITY RELAY *

UTILITY SIGNAL

OPEN RELAY

MODEL

PLUG

LLS

187B / 180B

* SUPPLIED BY UTILITY PROVIDER

Liquid Line Solenoid

A06526

Fig. 6 - 2-Stage Control Board

Evolution Controlled Low Ambient Cooling

This unit is capable of low ambient cooling down to 0_F (-17.78_C) without a kit - ONLY when using Evolution control. A low ambient kit is not required, and the outdoor fan motor does not need to be replaced for Evolution controlled low ambient operation.

The Evolution Control provides an automatic evaporator coil freeze protection algorithm that eliminates the need for an evaporator freeze thermostat. Low ambient cooling must be enabled in the User Interface set up. Fan may not begin to cycle until about 40_F (4.4_C) OAT. Fan will cycle based on coil and outdoor air temperature.

Evolution controlled low ambient mode operates as follows:

—Fan is OFF when outdoor coil temp is less than outdoor air temperature (+3_F / 1.67_C) or outdoor fan has been ON for 30 minutes. (Fan is turned off to allow refrigerant system to stabilize.)

—Fan is ON when outdoor coil temp is more than outdoor air temperature (+ 25_F / 13.89_C) or outdoor coil temp is more than 80_F (26.67_C) or if outdoor fan has been OFF for 30 minutes. (Fan is turned on to allow refrigerant system to stabilize.)

—Low pressure switch is ignored for first 3 minutes during low ambient start up. After 3 minutes, if LPS trips, then outdoor fan motor is turned off for 10 minutes with the compressor running. If LPS closes within 10 minutes, then cooling continues with the outdoor fan cycling per the coil temperature routine listed above for the remainder of the cooling cycle. If the LPS does not close within 10 minutes, then the normal LPS trip response (shut down cooling operation and generate LPS trip error) will occur.

—The PWM output for both high and low-stage equals the value for low-stage operation, below 55_F (12.8_C).

Check Charge

Models 180B / 187B should be charged in high stage compressor operation. Factory charge amount and desired subcooling are shown on unit rating plate. Charging method is shown on information plate inside unit. To properly check or adjust charge, conditions must be favorable for subcooling charging. Favorable conditions exist when the outdoor temperature is between 70_F and 100_F (21.11_C and 37.78_C), and the indoor temperature is between 70_F and 80_F (21.11_C and 26.67_C). Follow the procedure below:

Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge by adding or removing 0.6 oz/ft of 3/8 liquid line above or below 15ft (4.57 m) respectively.

For standard refrigerant line lengths (80 ft/24.38 m or less), allow system to operate in cooling mode at least 15 minutes. If conditions are favorable, check system charge by subcooling method. If any adjustment is necessary, adjust charge slowly and allow system to operate for 15 minutes to stabilize before declaring a properly charged system.

If the indoor temperature is above 80_F (26.67_C), and the outdoor temperature is in the favorable range, adjust system charge by weight based on line length and allow the indoor temperature to drop to 80_F (26.67_C) before attempting to check system charge by subcooling method as described above.

If the indoor temperature is below 70_F (21.11_C), or the outdoor temperature is not in the favorable range, adjust charge for line set length above or below 15ft (4.57 m) only. Charge level should then be appropriate for the system to achieve rated capacity. The charge level could then be checked at another time when the both indoor and outdoor temperatures are in a more favorable range.

NOTE: If line length is beyond 80 ft (24.38 m) or greater than 20 ft (6.10 m) vertical separation, See Long Line Guideline for special charging requirements.

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Bryant 187B installation instructions Evolution Controlled Low Ambient Cooling, Check Charge
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187B specifications

The Bryant 187B is a cutting-edge heating and cooling solution designed for efficiency and performance in residential and light commercial applications. This HVAC unit incorporates advanced technologies that prioritize energy savings, user comfort, and reliability.

One of the primary features of the Bryant 187B is its two-stage cooling and heating capability. This technology allows the system to operate at lower capacity most of the time, which not only saves energy but also enhances indoor comfort by minimizing temperature fluctuations. When the demand increases, the system automatically ramps up to meet the needs, providing a consistent and comfortable environment.

Efficiency is a hallmark of the Bryant 187B, boasting a SEER rating of up to 18.5 and an AFUE rating of 80%. These ratings signify that the unit exceeds minimum efficiency requirements, leading to lower energy bills and a reduced carbon footprint. The inclusion of environmentally friendly refrigerants, such as R-410A, further emphasizes its commitment to sustainable practices.

Another notable characteristic of the Bryant 187B is its Quiet Operation technology. The unit is designed with sound-dampening features that reduce operational noise, ensuring that the indoor environment remains peaceful. This is particularly valuable in residential areas where noise pollution can be a concern.

The Bryant 187B also comes equipped with advanced thermostat compatibility, allowing homeowners to integrate smart home technologies seamlessly. This feature enables remote temperature control and scheduling, leading to more efficient energy use and enhanced comfort. Users can easily adjust settings through mobile applications, ensuring that their home is always at the desired temperature upon arrival.

Reliability is a key aspect of the Bryant 187B, featuring a robust construction designed to withstand various environmental conditions. With a durable cabinet and high-quality components, this unit is built to last and requires minimal maintenance.

Overall, the Bryant 187B exemplifies modern HVAC technology, combining efficiency, comfort, and reliability into a single cohesive system. It remains an excellent choice for those seeking an effective solution for heating and cooling needs, ensuring that homes remain comfortable throughout the year while being mindful of energy consumption.
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