COOLING CYCLE

 

 

REVERSING VALVE

 

 

(ENERGIZED)

 

OUTDOOR FAN

 

INDOOR

INDOOR COIL

 

FAN

 

 

 

ACCUMULATOR

 

 

SUCTION SERVICE

 

 

PORT AT SERVICE

 

 

VALVE (CLG CYCLE)

COMP

 

 

 

 

STRAINER

STRAINER

 

OUTDOOR

 

COIL

 

 

(METERING)

SUCTION

LIQUID LINE

SERVICE

PRESSURE SWITCH

 

 

PORT

HEAT PUMP

(BYPASSING)

 

ACCESSORY

LIQUID LINE SERVICE PORT

FILTER DRIER

AT SERVICE VALVE (CLG CYCLE)

(DUAL FLOW)

 

A88400

Fig. 42—Heat Pump Refrigerant-Flow Diagrams

CAUTION: Due to the high pressure of nitrogen, it should never be used without a pressure regulator on the tank.

Leaks in a system pressurized with refrigerant can be spotted with a leak detector that detects extremely small refrigerant leaks. This discussion assumes that system is pressurized with either all refrigerant or a mixture of nitrogen and refrigerant.

If system has been operating for some time, make first check for a leak visually. Since refrigerant carries a small quantity of oil, traces of oil at any joint or connection are an indication that refrigerant is leaking at that point.

A simple and inexpensive method of testing for leaks is to use soap bubbles. Any solution of water and soap may be used. Soap solution is applied to all joints and connections in system. A small pinhole leak is located by tracing bubbles in soap solution around leak.

Use electronic leak detector to check for leaks. This unquestion- ably is the most efficient and easiest method for checking leaks. There are various types of electronic leak detectors. Generally speaking, they are all portable, and most are lightweight, consist- ing of a box with several switches and a probe or sniffer. Detector is turned on and probe is passed around all fittings and connections in system. Leak is detected by either a movement of a pointer on detector dial, by a buzzing sound, or a light.

In all instances, when a leak is found, system charge must be bled down and leak repaired before final charging and operation. After leak testing or leak is repaired, evacuate system, and recharge with correct refrigerant charge.

A88401

Fig. 43—Leak Detector

III. BRAZING

When brazing is required in the refrigeration system, certain basics should be followed:

1.Clean joints make the best joints. To clean:

a.Remove all oxidation from surfaces to a shiny finish before brazing.

TABLE 19—24V PIN CONNECTION TROUBLESHOOTING

MODE OF OPERATION

TERMINAL

LOCATION ON

VOLTAGE

VOLTAGE

POSSIBLE SOURCE

18-PIN CONNECTOR

DESIGNATION

CONTROL BOARD

PATH

REQUIRED

OF PROBLEM

All

R-C

2-1

Input

24

Check transformer (secondary)

Low-speed Cooling

Y1,0-C

8,6-1

Input

24

Check thermostat

High-speed Cooling

Y1, Y2, 0-C

8,7,6-1

Input

24

Check thermostat

Low-speed Heating

Y1-C

8-1

Input

24

Check thermostat

 

Y1-C

8-1

Input

24

Check thermostat

High-speed Heating

 

 

 

 

 

Y2-C

7-1

Output

24

Outdoor temperature below

 

speed; change temperature

 

 

 

 

 

 

Y1-C

8-1

Input

24

Check thermostat

Defrost

 

 

 

 

 

Y2, W2, 0-C

7,5,6-1

Output

24

Outdoor temperature below 50°F;

 

Coil temperature less than 30°F

 

 

 

 

 

Second Stage of

Y1, W2-C

7,5-1

Input

24

Check thermostat

Auxiliary Heat

W3, Y2-C

9,8-1

Output

24

Check balance-point setting

 

 

 

 

 

 

Cooling Second-

Y1, Y2, 0-C

8,7,6-1

Input

24

Ambient thermistor failure;

stage Latching

Check second-stage POT

 

 

 

 

—37—

Page 37
Image 37
Bryant R-22 service manual III. Brazing, 24V PIN Connection Troubleshooting, Cooling Cycle, All, Auxiliary Heat

R-22 specifications

The Bryant R-22 stands out in the landscape of residential heating and cooling systems with its combination of efficiency, durability, and modern technology. Designed primarily for homeowners seeking comfortable climate control solutions, the R-22 model delivers consistent performance throughout varying seasonal extremes.

One of the main features of the Bryant R-22 is its high energy efficiency. Rated with a SEER (Seasonal Energy Efficiency Ratio) that meets or exceeds industry standards, this air conditioning unit is designed to reduce energy consumption while providing optimal cooling. This not only helps in lowering monthly utility bills but also promotes environmentally responsible usage.

Another notable characteristic is the unit's durability. Constructed with a robust cabinet and high-quality components, the R-22 is built to withstand the rigors of daily use, with protective features that enhance its longevity. The cabinet comes with a powder-coated finish that resists corrosion and harsh weather conditions, ensuring that the unit stays functional and aesthetically pleasing for years.

The Bryant R-22 also incorporates advanced technology to improve user experience. One such innovation is the SmartSet technology, which allows homeowners to program their unit to optimize comfort levels according to their specific needs. This programmable capability enhances energy savings and ensures that the home remains at the desired temperature when residents are present.

Moreover, the unit features a Quiet Operating System that significantly reduces noise levels, making it suitable for residential areas where noise might be a concern. The design minimizes vibrations and optimizes airflow, creating a comfortable environment without disruptive sounds.

For added convenience, the Bryant R-22 is compatible with various thermostat options, including Wi-Fi-enabled models. This allows users to control their home's climate from anywhere using a smartphone app, facilitating effortless adjustments and monitoring of energy usage.

Finally, the Bryant R-22 is backed by a solid warranty, providing peace of mind for homeowners. This commitment to quality and customer satisfaction is a testament to Bryant’s dedication to producing reliable and efficient HVAC solutions. Overall, the Bryant R-22 is an exemplary choice for those looking to enhance their home comfort with the latest in HVAC technology.