CARRIER TRANSICOLD AIRV 68RV11122A (01) PDF Document

Always adhere to the following operating precautions for your CARRIER TRANSICOLD AIRV 68RV11122A:

• Always wear safety glasses.

• Keep hands clear of the evaporator blower and condenser fan.

• No work should be performed on the unit until all circuit breakers and start-stop switches are turned off, and the power supply is disconnected.

• Always work in pairs. Never work alone.

• In case of severe vibration or unusual noise, stop the unit and investigate.

When performing maintenance on your CARRIER TRANSICOLD AIRV 68RV11122A, follow these precautions:

• Beware of unannounced starting of the evaporator blower & condenser fan. Do not remove the ceiling grill assembly or the upper unit cover assembly before turning the power off and disconnecting the power supply. Before disconnecting, discharge capacitors by shorting across the capacitor’s terminals.

• When disassembling wiring, use numbered stickers to identify wire leads and terminals. This aids in quick, accurate reassembly.

• Be sure power is turned off before working on motors, controllers, or electrical control switches. Tag any circuit breakers and power supply to prevent accidental energizing of circuits.

• Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires. Problems with the system should be diagnosed and any necessary repairs must be performed by qualified service personnel.

• In case of an electrical fire, open the circuit switch and extinguish with CO2 (never use water).

• Use dry nitrogen to pressurize the system for leak checking. Be careful not to exceed 150 psig test pressure in the hermetic compressor.

• Coil fins are sharp. Use care when removing the cover from the base pan to avoid personal injury.

• Oil vapor in piping stubs can ignite from torch flame and cause serious injury. Exercise extreme care when brazing, and keep brazing cloth and a fire extinguisher handy for emergency use.

• Disconnect power to the AirV unit before checking the capacitor.

Before working on the CARRIER TRANSICOLD AIRV 68RV11122A, be sure to first disconnect all electric power to the unit to avoid the possibility of electrical shock and personal injury. Before disconnecting, discharge capacitors by shorting across the capacitor terminals.

The serial number on your CARRIER TRANSICOLD AIRV 68RV11122A provides manufacturing information:

• The first two numbers indicate the week the unit was manufactured (e.g., 01 for the first week, 52 for the last week).

• The third and fourth numbers designate the year of manufacture (e.g., 99 for 1999, 00 for 2000).

• The letter Y and the subsequent numbers represent the unique unit serial number.

For example, a serial number of 1303Y12345 means the unit was manufactured in the 13th week of 2003, and its serial number is Y12345.

The Dry Mode function on the CARRIER TRANSICOLD AIRV 68RV11122A effectively eliminates moisture by operating the compressor and fan motor intermittently, maintaining the room temperature at the set point. The compressor will be “on” for 5 minutes, then “off” for 5 minutes. The system fan motor will operate on low speed. The unit determines Dry Mode by sensing the room temperature every 5 minutes.

No. The addition of a heat strip to a cool-only CARRIER TRANSICOLD AIRV 68RV11122A requires a new ceiling assembly (Part # 99-00469-02). The Master Switch and Thermostat have additional functions to accommodate heat. The Thermostat is a dual position (SPDT) contact as opposed to a single position (SPST).

The heat strip on the CARRIER TRANSICOLD AIRV 68RV11122A is secured for shipping purposes. To resolve this, remove the heat strip, flip it over, and mount it in the airflow. When properly installed in this manner, the interface cable will reach the connector.

This indicates the system on your CARRIER TRANSICOLD AIRV 68RV11122A has locked out due to the “Compressor Circuit” being interrupted for an abnormal reason during operation, such as a power interruption or voltage drop (Brown-Out). The electronics monitor the voltage and will lock out for safety. To ‘re-set’, disconnect the 12 VDC from the electronic controls for 15 seconds and then reconnect. If the alarm returns, check the 115 VAC with an amp meter to determine if the unit amp draw (with compressor and fan running) is within specifications according to the unit model.

First, check to see if the filters on your CARRIER TRANSICOLD AIRV 68RV11122A are clean. Once cleaned, take the temperature of the air going into the filters and compare it to the air temperature coming out of the unit. For ducted units, take the reading as close as possible to the unit air outlet. The temperature difference (Delta-T) should be 20 to 25 degrees. This test requires the interior temperature to be warm enough to provide a good heat load to the system. If the interior temperature is cold, the temperature drop may not be as high as 20 to 25 degrees. If the temperature drop is not as described, take an amp draw on the unit’s 115 VAC and compare it to the correct model specifications.

Your CARRIER TRANSICOLD AIRV 68RV11122A has a temperature sensor probe that should be inserted into the indoor (evaporator) coil during installation. It needs to detect a temperature drop within 5 minutes of compressor start-up to confirm proper operation. Check to see if the probe has been inserted into the coil correctly. The probe is 2.5 to 3 inches in length with 2 brown wires.

The remote control for the CARRIER TRANSICOLD AIRV 68RV11122A was developed using the Celsius scale. When converted to Fahrenheit, it stages in 2-degree (F) increments most of the time, and occasionally a 1-degree increment. This is normal and cannot be changed.

The manual control Thermostat on a Free-blow ceiling unit of the CARRIER TRANSICOLD AIRV 68RV11122A has a temperature range of 61 to 89 degrees F.

Yes, the Free-blow unit of the CARRIER TRANSICOLD AIRV 68RV11122A is designed to have the fan run continuously.

The blinking red light on your CARRIER TRANSICOLD AIRV 68RV11122A indicates that 12 VDC is installed and powered to the unit controls. If there is no light blinking, the unit controls will not operate the 115 VAC equipment.

Each CARRIER TRANSICOLD AIRV 68RV11122A unit should have a dedicated 20 Amp (12 gauge wire with ground) protected circuit.

Not necessarily a new one is needed. For CARRIER TRANSICOLD AIRV 68RV11122A units with heat strips manufactured after serial number 3507Y, they are equipped with a manual reset overload protector. Access the electrical connections at the heat strip assembly. On the back of the overload protector, there is a “RED” reset button. Push the button in until it clicks to reset. If no reset button is present, check the element for an open circuit or a resistance value of 9 Ohms.

The temperature for the CARRIER TRANSICOLD AIRV 68RV11122A is sensed at the ceiling unit, not at the remote control. The temperature offset can be even more in RVs with higher ceilings. This is more common in heat mode, as warm air rises.

For ducted CARRIER TRANSICOLD AIRV 68RV11122A units, the GREEN operation indicator LED will flash if there is a problem. Use this table to diagnose and resolve issues:

When a repair has been accomplished due to a corresponding alarm on your CARRIER TRANSICOLD AIRV 68RV11122A, the alarm must be cleared. This is done by disconnecting the 12 VDC power to the ducted ceiling assembly for one or two seconds. Once the 12 VDC power is reconnected, the alarm should have been cleared.

The flashing green LED on your ducted CARRIER TRANSICOLD AIRV 68RV11122A indicates a specific error. If more than two errors occur, the highest ranked code is displayed. If the highest ranked error is cleared, the next highest ranked error code is displayed.

Follow these steps for preventative maintenance on your CARRIER TRANSICOLD AIRV 68RV11122A:

Cleaning: Clean the evaporator and condenser coils. Use a flashlight to check for clear spaces. Dust accumulation reduces airflow and cooling capacity. Coils can be vacuumed when dry or brushed with a stiff brush and blown out with compressed air. Thoroughly clean the base pan, motors, fan wheels, and other components. Clean the cover and ceiling grill with mild detergents. Do not use carbon tetrachloride, solvents, or waxes containing solvents on plastic sections.

Painting: Paint any parts showing rust with a good rust-prevention paint.

Wiring: Check all wiring for deterioration and all electrical contacts for tightness or corrosion.

Mounting: Ensure the unit is secure on the roof according to installation instructions. Check that fans are correctly positioned in the center of the orifice and tight on the shaft.

Leaks: Check any connections for oil or leaks. Check gaskets for possible air leakage.

Controls: Check the unit to ensure all controls are functioning correctly and operation is normal. Vibrations can cause unwanted noise. Ensure that piping is not vibrating against the side of the unit.

To remove the filter on the Free Blow ceiling unit of your CARRIER TRANSICOLD AIRV 68RV11122A, follow these steps:

Step 1. Grasp the edge of the filter at the recess in the end of the ceiling grill.

Step 2. Pull the filter completely out of the filter slot.

Step 3. Vacuum the filter or wash it in lukewarm water. Shake off excess water and dry thoroughly.

Step 4. Replace the filter by sliding it back into the filter slot until the filter frame is flush with the interior grill.

To remove the ceiling grill on the Free Blow system of your CARRIER TRANSICOLD AIRV 68RV11122A, do the following:

Step 1. Before working on the unit, place the master switch in the OFF position and disconnect all electrical power.

Step 2. Remove the 4 screws located on the ceiling grill, making sure to support the weight of the grill.

Step 3. Lower the ceiling grill from the ceiling panel.

Step 4. To replace the grill, place it up against the ceiling panel, align the screw holes, and replace the 4 screws.

Capacitors must be discharged properly before testing. WARNING: Do not touch the metal of the screwdriver when discharging the capacitor. You could receive a shock.

Step 1. Place a 20,000 ohm, 2-watt resistor across the terminals of the capacitor for approximately 30 seconds to discharge it.

Step 2. After the capacitor has been discharged and all wires are removed, use an ohmmeter to test its resistance.

Step 3. Set the ohmmeter scale to R x 1K or 10K ohm and place the leads across the capacitor terminals.

Step 4. If the ohmmeter first reads 0, then rises toward infinity or some higher resistance, the capacitor is good.

Step 5. If the ohmmeter goes to 0 or a low resistance and stays there, the capacitor is shorted and needs to be replaced.

Step 6. If the ohmmeter reads infinity (OL), the capacitor is open and needs to be replaced.

To troubleshoot the PTC (Start Thermistor) on your CARRIER TRANSICOLD AIRV 68RV11122A, follow these steps:

Step 1. Disconnect power from the AirV unit.

Step 2. Disconnect the wires to the PTC.

Step 3. Using an ohm meter, check for continuity across the PTC. If there is no continuity, it must be replaced. If continuity exists, reconnect the wires.

Step 4. Reconnect power to the AirV unit.

Step 5. Turn on the AirV unit to start.

Step 6. Use a clamp-on amp probe to monitor the amp draw of the compressor during its start-up. When the compressor starts, an amp draw will be indicated for almost a second. If no amp draw is indicated or if the amp draw occurs for much longer than a second, the PTC is defective and must be replaced.

CAUTION: The change from Fahrenheit to Celsius will be permanent. It cannot be changed back to Fahrenheit.

To change the remote control display on your CARRIER TRANSICOLD AIRV 68RV11122A, follow these steps:

Step 1. Remove the batteries from the remote control.

Step 2. Carefully remove the remote cover by inserting a narrow flat object between the cover and remote body and prying it apart.

Step 3. Remove the brass screw holding the PCB in place.

Step 4. Carefully remove the PCB board from the remote body, ensuring the battery springs release from their holders.

Step 5. Locate FR9 on the PCB board.

Step 6. Carefully cut the FR9 jumper wire.

Step 7. Reverse the above procedure for reassembly. CAUTION: When re-assembling, ensure the battery springs are correctly placed in the battery spring holders.

WARNING: Before installing the thermostat, turn off all power to the unit. There may be more than one power disconnect. Electrical shock can cause personal injury or death.

Thermostat Location:

• Mount approximately 5 feet (1.5m) from the floor, on an inside partitioning wall without pipes or duct work, and close to a frequently used room.

• DO NOT mount close to a window, outside wall, or door; in direct light/heat from lamps or the sun; in direct airflow from registers; or in areas with poor air circulation.

Installation Steps:

Step 1. Turn off all power to the unit.

Step 2. If replacing an old thermostat, remove it and disconnect wires one at a time, recording the wire color and terminal marking for each.

Step 3. Separate the front and back pieces of the new thermostat plastic case.

Step 4. Route thermostat wires through the hole in the back piece. Level it against the wall and mark the two mounting holes.

Step 5. Drill two 3/16 inch mounting holes where marked.

Step 6. Secure the back piece to the wall with the provided anchors and screws.

Step 7. Connect the wires to the proper terminals on the connector block in the front piece of plastic.

Step 8. Push any excess wire back into the wall and seal the hole to prevent air leaks.

Step 9. Snap the front and back pieces together.

Step 10. Turn on power to the unit.

To enter configuration mode on your CARRIER TRANSICOLD AIRV 68RV11122A thermostat, press and hold the FAN button for approximately 10 seconds until the room temperature disappears and the display reads ‘A’. While in configuration mode, you can adjust the following:

A – Anticipator Value Adjustment: Controls sensitivity and cycle rate (1-3, default 2). Higher numbers slow the cycle rate.

• Use UP & DOWN buttons to display ‘A’.

• Press MODE once to display the current value.

• Use UP & DOWN buttons to change the value.

• Press MODE to return to ‘A’.

d – Fahrenheit/Celsius Selection:

• Use UP & DOWN buttons to display ‘d’.

• Press MODE once to display ‘F’ or ‘C’.

• Use UP & DOWN buttons to change between F & C.

• Press MODE to return to ‘d’.

oF – Room Temperature Offset Adjust: Adjusts the temperature reading from -5 to +5 degrees (default 0).

• Use UP & DOWN buttons to display ‘oF’.

• Press MODE button once to display the offset value.

• Use UP & DOWN buttons to select a value between -5 and 5.

• Press MODE to return to ‘oF’.

To exit configuration mode, press the FAN button or wait two minutes.