2.Make sure that thermistor leads are connected to the proper pin terminals at the J5 connector on EXV board and that thermistor probes are located in proper position in the refrigerant circuit.

When these checks have been completed, the actual opera- tion of the EXV can be checked by using the procedures out- lined in Step 5 — Check Operation of the EXV section below.

STEP 5 — CHECK OPERATION OF THE EXV — Use the following procedure to check the actual operation of the EXVs. The ENABLE/OFF/REMOTE contact switch must be in the OFF position.

1.Close the liquid line service valve for the circuit to be checked and run through the appropriate service test to pump down the low side of the system. Run lead com- pressor for at least 30 seconds to ensure all refrigerant has been pumped from the low side and that the EXV has been driven fully open (1500 steps).

NOTE: Do not use the Emergency ON-OFF switch to recycle the control during this step.

2.Turn off the compressor circuit breaker(s) and the control circuit power and then turn the Emergency ON/OFF switch to the OFF position. Close compressor service valves and remove any remaining refrigerant from the low side of the system.

3.Carefully loosen the 2-1/8in. nut. Do not twist the valve. Remove the motor canister from the valve body using caution to avoid damage to the o-ring seal. If the EXV plug was disconnected during this process reconnect it after the motor canister is removed.

4.Note position of lead screw (see Fig. 15). If valve has re- sponded properly to processor signals in Step 5.1 above, the lead screw should be fully retracted.

5.Recycle the control by turning the Emergency ON-OFF switch to the ON position. This puts the control in initial- ization mode. During the first 60 seconds of the initializa- tion mode, each valve is driven to the fully closed posi- tion (1500 steps) by the processor. Observe the move- ment of the lead screw. It should be smooth and uniform from the fully retracted (open) to the fully extended (closed) position.

6.When the test has been completed, carefully reassemble expansion valve. Apply a small amount of O-ring grease to the housing seal O-ring before installing the motor can- ister. Be careful not to damage the O-ring. Tighten the motor nut to 15 to 25 lb-ft (20 to 34 N-m). Evacuate the low side of the open refrigerant circuit. Open compressor service valves and close compressor circuit breakers.

Open liquid line service valve. Check for any refrigerant leaks. Turn the ENABLE/OFF/REMOTE switch back to ENABLE or REMOTE and allow the unit to operate. Verify proper unit operation.

NOTE: The EXV orifice is a screw-in type and may be removed for inspection and cleaning. Once the motor canister is removed the orifice can be removed by using the orifice removal tool (part no. TS429). A slot has been cut in the top of the orifice to facilitate removal. Turn orifice counterclockwise to remove. A large screwdriver may also be used.

When cleaning or reinstalling orifice assembly be careful not to damage orifice assembly seals. The bottom seal acts as a liquid shut-off, replacing a liquid line solenoid valve. If the bot- tom seal should become damaged it can be replaced. Remove the orifice. Remove the old seal. Using the orifice as a guide, add a small amount of O-ring grease, to the underside of the or- ifice. Be careful not to plug the vent holes. Carefully set the seal with the O-ring into the orifice. The O-ring grease will hold the seal in place. If the O-ring grease is not used, the seal O-ring will twist and bind when the orifice is screwed into the EXV base. Install the orifice and seal assembly. Remove the orifice to verify that the seal is properly positioned. Clean any O-ring grease from the bottom of the orifice. Reinstall the ori- fice and tighten to 100 in.-lb (11 N-m). Apply a small amount of O-ring grease to the housing seal O-ring before installing the motor canister. Reinstall the motor canister assembly. Tighten the motor nut to 15 to 25 ft-lb (20 to 34 N-m).

Alarms and Alerts — These are warnings of abnormal or fault conditions, and may cause either one circuit or the whole unit to shut down. They are assigned code numbers as described in Table 29.

Automatic alarms will reset without operator intervention if the condition corrects itself. The following method must be used to reset manual alarms:

Before resetting any alarm, first determine the cause of the alarm and correct it. Enter the Alarms mode indicated by the LED on the side of the Scrolling Marquee Display. Press

ENTER and until the sub-menu item RCRN “RESET

ALL CURRENT ALARMS” is displayed. Press ENTER .

The control will prompt the user for a password, by displaying

PASS and WORD. Press ENTER to display the default pass-

word, 1111. Press ENTER for each character. If the password

has been changed, use the arrow keys to change each individu-

al character. Toggle the display to “YES” and press ENTER . The alarms will be reset.

48

Page 47 Page 49
Page 48
Image 48
Carrier Air Conditioner specifications
Page 47 Page 49

Air Conditioner specifications

Carrier Air Conditioners have long been synonymous with reliability and innovation in climate control. Founded by Willis Carrier, the inventor of modern air conditioning, the brand has continuously set industry standards through state-of-the-art technologies and features designed to enhance indoor comfort.

One of the standout features of Carrier air conditioners is their energy efficiency. Many models are equipped with advanced inverter technology, allowing the compressor to adjust its speed based on the cooling demand. This results in decreased energy consumption, which not only reduces utility bills but also lessens the environmental impact. Recognizing the importance of sustainable practices, Carrier has integrated eco-friendly refrigerants into their systems, further promoting energy-efficient operations.

Carrier also emphasizes user comfort through its variable speed systems. These systems maintain consistent temperatures while minimizing temperature fluctuations, ensuring an even distribution of cool air throughout the home. Additionally, many Carrier models come with advanced air filtration systems, designed to capture allergens, dust, and other particulates, thereby improving indoor air quality.

The smart technology featured in Carrier air conditioners plays a key role in modern convenience. Many units are compatible with smart home systems, allowing users to control settings remotely via smartphones or voice-activated devices. With features like programmable thermostats, users can easily set cooling schedules to match their lifestyle, ensuring comfort while maximizing energy savings.

Durability and noise reduction are also central to the Carrier brand. Many models are designed with sound-dampening features, making them some of the quietest units on the market. This is particularly advantageous for residential use, where noise can disrupt daily activities and sleep.

In terms of design, Carrier air conditioners come in various styles and capacities to suit a wide range of spaces, from compact apartment units to large central systems for sprawling homes. Their extensive warranty and service offerings further reinforce Carrier’s commitment to customer satisfaction.

In conclusion, Carrier air conditioners represent a perfect blend of cutting-edge technology, energy efficiency, and user comfort. Their emphasis on sustainability and smart features positions them as a leading choice for homeowners seeking reliable and innovative climate control solutions. Whether for cooling a small room or an entire house, Carrier remains a trusted name in air conditioning.
Top Page Image Contents