CARRIER TRANSICOLD AIRV 68RV14113A (01) PDF Document

The following general safety notices are recommended precautions that must be understood and applied during operation and maintenance of the CARRIER TRANSICOLD AIRV 68RV14113A.

FIRST AID

An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention immediately.

OPERATING PRECAUTIONS

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 power supply is disconnected.

Always work in pairs. Never work alone.

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

MAINTENANCE 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 capacitors 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 electrical fire, open 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 form 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 fire extinguisher handy for emergency use.

Disconnect power to the AirV unit before checking the capacitor.

The serial number provides information about the manufacturing date of your CARRIER TRANSICOLD AIRV 68RV14113A.

The first two numbers of the serial number indicate the week the unit was manufactured. For example, 01 would designate the first week of the year and 52 would designate the last week of the year.

The third and fourth numbers designate the year in which the unit was manufactured. For example, 99 would represent the year 1999, 00 the year 2000, and so on.

The letter Y and all the numbers after it designate the unit serial number. Example: Y43210

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

The Dry Mode function on the CARRIER TRANSICOLD AIRV 68RV14113A effectively eliminates moisture by operating the compressor and fan motor intermittently, so that the room temperature is maintained at the set temperature. 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 Room Temperature every 5 minutes (a 3-minute minimum operation of the compressor is not applied).

The cooling cycle is energized when the thermostat calls for cooling. The main components are the compressor, air-cooled condenser coil, strainer, capillary tube, evaporator coil, and accumulator.

1. The compressor raises the pressure and temperature of the refrigerant and forces it through the discharge line into the condenser coil.

2. The condenser fan circulates surrounding air over the outside of the coil tubes. Heat transfers from the refrigerant to the air, causing the refrigerant to liquefy.

3. Liquid refrigerant flows through a strainer, which removes impurities, to the capillary tube.

4. The capillary tube meters the flow of liquid refrigerant to the evaporator coil, reducing its pressure and temperature.

5. The evaporator blower pulls vehicle air through filters and passes it over the evaporator coil.

6. The cold refrigerant inside the evaporator coil tubes absorbs heat from the vehicle air. The cooled air is then circulated back into the vehicle interior.

7. The heat absorption causes the liquid refrigerant to vaporize. This low-pressure vapor passes into the accumulator, which ensures only vapor refrigerant is returned to the compressor to repeat the cycle.

No. The addition of a heat strip requires a new ceiling assembly (Pt# 99-00469-02). The Master Switch and Thermostat have additional functions to accommodate heat. The Thermostat has dual position (SPDT) contacts as opposed to single position (SPST).

The heat strip is secured for shipping purposes. 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 system has locked out due to the “Compressor Circuit” being interrupted for an abnormal reason during operation. This can be caused by a power interruption or voltage drop (Brown-Out). The electronics monitor the voltage to the unit and will lock out for safety. To ‘re-set’, disconnect the 12 VDC from the electronic controls for 15 seconds and re-connect. 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 the specifications for the unit model.

First, check to see if the filters 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. If it’s a ducted unit, 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. 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.

There is a temperature sensor probe that should be inserted into the indoor (evaporator) coil at the time of installation. It needs to see 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 and if it is properly inserted. The probe is 2.5 to 3 inches in length with 2 brown wires.

When the remote control was developed, it was based on the Celsius scale. When converted to Fahrenheit, it stages in 2-degree (F) increments most times, and occasionally a 1-degree increment. This is normal and cannot be changed.

The manual control Thermostat on a freeblow ceiling unit is 61 to 89 degrees F.

Yes, the Freeblow unit is designed to have the fan run continuously.

The blinking red light 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 68RV14113A unit should have a dedicated 20 Amp (12 gauge wire with ground) protected circuit.

Not necessarily. Heat strips manufactured after 3507Y are equipped with a manual reset overload protector. Remove required components to 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 is sensed at the ceiling unit, not at the remote control. The temperature offset can be even more with RV’s with higher ceilings. This is more common in heat mode, as warm air rises.

If your unit has no power, perform the following checks:

1. Reset master switch.

2. Reset circuit breaker.

3. Replace wiring if defective.

4. Tighten any loose electrical connections.

5. Replace any faulty switches, thermostat, or fan.

6. For Ducted Systems, ensure the 12 VDC is connected.

7. For Ducted Systems, check and replace the 12 VDC in-line fuse if it is open.

If the display is not illuminated, check the 12 Volt DC in-line fuse.

If the display is illuminated, check the 115 Volt AC connections.

Perform the following troubleshooting steps:

1. Check the 115 volt AC power source.

2. Momentarily disconnect the 12 VDC power source.

3. Disable the compressor malfunction test switch.

4. Check the AMP draw.

5. Check the Delta T (temperature difference).

Perform the following troubleshooting steps:

1. Remove the grill and verify the evaporator coil probe is inserted into the coil.

2. Check the AMP draw.

3. Check the Delta T (temperature difference).

4. If the issue persists, replace the unit.

This could be caused by several issues. Here are the probable causes and remedies:

1. Loose lead at fan motor: Tighten the lead.

2. Defective or burned out motor: Replace the motor.

3. Outdoor air restricted or recirculating: Check for a dirty condenser coil, ensure proper clearance around the unit, and remove any obstructions.

4. Overcharge or noncondensables in system: Check the AMP draw.

5. Restricted discharge line: Check for an obstruction in the line. Check Delta T. If necessary, replace the unit.

6. Defective motor overload switch: Replace the switch.

Follow these steps to address insufficient cooling:

1. Dirty evaporator coil: Clean as required.

2. Iced evaporator coil, slightly low refrigerant charge: Defrost or recharge.

3. Improper fan operation: Verify fan rotation (refer to the wiring diagram).

4. Defective fan motor: Replace the fan motor.

5. Return air filter is dirty: Remove and clean filters.

If water is dripping from the ceiling unit, first verify that the vehicle is level. Then, tighten the unit mounting bolts evenly or replace the unit gasket.

When a repair has been accomplished due to a corresponding alarm, 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 system self-diagnostics function will display an error pattern if a malfunction is detected. 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.

Cleaning: Clean the evaporator and condenser coils. Hold a flashlight behind the coil to see if all spaces are clear. Dust accumulation obstructs airflow and reduces cooling capacity. Coils may be vacuumed when dry, brushed with a stiff brush, and then 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.

Painting: Paint any parts that show evidence of rust with a good rust-prevention paint.

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

Mounting: Make sure the unit is secure on the roof according to installation instructions. Check fans to ensure they are correctly positioned and tight on the shaft.

Leaks: Check any connections that show evidence of oil or leaks. Check gaskets for possible air leakage.

Controls: Check the unit to ensure all controls are functioning correctly and unit operation is normal.

The filters are located in the ceiling grill. To remove the filters, do the following:

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

b. Pull the filter completely out of the filter slot.

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

d. Replace the filter by sliding it into the filter slot in the ceiling grill until the filter frame is flush with the interior grill.

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

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

c. Lower the ceiling grill from the ceiling panel.

d. To replace the grill, place the grill up against the ceiling panel and align the screw holes in the grill with the ceiling panel.

e. Replace the 4 screws.

The filters are located in the ceiling grill. To remove the filters, do the following:

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

b. Pull the filter completely out of the filter slot.

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

d. Replace the filter by sliding it into the filter slot in the ceiling grill until the filter frame is flush with the interior grill.

Capacitors must be discharged properly before testing.

Discharging the Capacitor:

a. Place a 20,000 ohm, 2 watt resistor across the terminals of the capacitor for approximately 30 seconds. Do not touch the metal of the screwdriver when discharging the capacitor, as you could receive a shock.

Testing the Capacitor:

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

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

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

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

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

Capacitors showing signs of leaks or bulging should be replaced immediately.

a. Disconnect power from the AirV unit.

b. Disconnect the wires to the PTC.

c. Using an ohm meter, check for continuity across the PTC. If the PTC does not have continuity, it must be replaced. If continuity exists, reconnect the wires to the PTC.

d. Reconnect power to the AirV unit.

e. Turn on the AirV unit to start.

f. 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.

a. Remove the batteries from the remote control.

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

c. Remove the brass screw holding the PCB in place.

d. Carefully remove the PCB board from the remote body, making sure the battery springs release from their holders.

e. Locate FR9 on the PCB board.

f. Carefully cut the FR9 jumper wire.

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

Thermostat Location:

The thermostat should be mounted approximately 5 feet (1.5m) from the floor, on an inside partitioning wall in a frequently used room, and on a section of wall without pipes or duct work. It should NOT be mounted near a window, outside wall, direct heat sources, or in areas with poor air circulation.

Installation Steps:

a. Turn off all power to the unit.

b. If replacing an existing thermostat, remove it and record the wire color and terminal marking for each wire as you disconnect it.

c. Separate the front and back pieces of the new thermostat.

d. Route thermostat wires through the hole in the back piece. Level it against the wall and mark the wall through the 2 mounting holes.

e. Drill two 3/16 inch mounting holes in the wall where marked.

f. Secure the back piece to the wall with the 2 anchors and screws provided.

g. Connect the wires to the proper terminals on the front piece of the thermostat.

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

i. Snap the front and back pieces of the thermostat together.

j. Turn on power to the unit.

Temperature Display: The thermostat will display room temperature until the UP or DOWN button is pressed. The word SET appears when these buttons are pressed, and the current set point is displayed. If no buttons are pressed for 5 seconds, the display will change back to show room temperature.

Timeguard Timer: A 3-minute timeguard is built into the thermostat. Any time the compressor turns off, it will not turn back on until the timeguard has expired. Pressing UP and FAN buttons simultaneously will override the timeguard for 1 cycle.

Cycle Timer: In normal operation, the thermostat will not allow more than 4 equipment cycles per hour (1 cycle every 15 minutes).

Minimum On Timer: Once the equipment has turned on, it will remain on for a minimum of 2 minutes regardless of demand. It can turn off in less than 2 minutes if a change in set point or mode occurs.

Error Messages: “E4” will be displayed if the thermostat has an internal memory failure; replace the thermostat. “–” (two dashes) will be displayed if the thermostat cannot properly read the room temperature; replace the thermostat.