RV Products 6700 Series Service Manual

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SERVICE MANUAL

FOR

6700, 7000, 8000 & 9000 SERIES

AIR CONDITIONERS

(MECHANICAL CONTROLS ONLY)

FOR WALL MOUNT THERMOSTATS AND LOW VOLTAGE CONTROL

CIRCUITS, REFER TO THEIR APPROPRIATE MANUALS

FOR ELECTRICAL CHECKOUTS ON DELTA T AND DELTA TX

AIR CONDITIONERS, REFER TO MANUAL R-332 (2-86)

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Summary of Contents for RV Products 6700 Series

Page 1: Service Manual
SERVICE MANUAL 6700, 7000, 8000 & 9000 SERIES AIR CONDITIONERS (MECHANICAL CONTROLS ONLY) FOR WALL MOUNT THERMOSTATS AND LOW VOLTAGE CONTROL CIRCUITS, REFER TO THEIR APPROPRIATE MANUALS FOR ELECTRICAL CHECKOUTS ON DELTA T AND DELTA TX AIR CONDITIONERS, REFER TO MANUAL R-332 (2-86)
Page 2 6757-7201 SERVICE TEST DEVICE This test device is an invaluable aid in quickly diagnosing repairs to all RV Products roof top air conditioners produced after 1979.
Page 3 TABLE OF CONTENTS Basic Components and Their Functions Refrigeration System Diagram Refrigeration Circuit ......... . Air Handling Circuits .
Page 4 BASIC COMPONENTS AND THEIR FUNCTIONS REFRIGERATION SYSTEM DIAGRAM DISCHARGE SUCTION LINE LINE COMP. CONDENSER EVAPORATOR MOTOR EVAPORATOR BLOWER CONDENSER COIL HIGH SIDE LOW SIDE...
Page 5 The purpose of this part of the Service Manual is to acquaint systems exists from the discharge port of the compressor to the Service Technician with the system components so that the cap tube. The low side is from the cap tube to the when he has a problem, he can intelligently analyze and compressor cylinders.
Page 6 saturation temperature, we call its condition sub-cooled Suction Line liquid. The suction line is the tube which carries the superheated vapor refrigerant from the evaporator to the compressor. During all of the three processes in the condenser (de- superheating, condensing, sub-cooling), the refrigerant gives Compressor up heat;...
Page 7 The power supply to the air conditioner must be wired an on-board motor generator, its wiring may be identical to through a circuit breaker or time delay fuse. The power the commercial power described above. supply must be 20 amperes and 12 AWG wire minimum. Any size There are, however, some motor generators on which both the current carrying leads are insulated from the ground.
Page 8 condition can be analyzed by using an ohm meter. Be sure to through the condenser coil. remove all the leads from the compressor terminals before making this check. * Some models use a squirrel cage on both ends of the motor. If the resistance between any two terminals is 0 An important step in installing a replacement fan motor is to ohms, the motor windings are shorted.
Page 9 Run Capacitors Good Capacitor The purpose of the run capacitors is to give the motors If the capacitor is good, the indicator will move from infinity starting torque and to maintain high power factor during (the left side), towards zero ohms and slowly return back to running.
Page 10 connected in series with the start winding and it gets Grounded Capacitor the generated voltage of the start winding portion of When testing for a grounded capacitor, perform a continuity the compressor motor. This generated voltage is check between each terminal on the capacitor and the bare much higher than line voltage and varies with the metal of the capacitor case.
Page 11 second) if there is one volt of pressure. Ammeter And Its Use An ammeter is an instrument for measuring electric current. An ohm meter is really a resistance meter that is calibrated in Current electricity is actually electrons moving from one atom ohms.
Page 12 terminals, but we know by referring to the wiring diagram, accurate to within a fraction of an ounce to prevent damage to that the black wire is the common terminal, the red wire is the compressor and insure proper performance. Systems must the start terminal and the white wire is the run terminal.
Page 13 Most all electronic leak detectors are very sensitive like, how hot was the weather, what time was it, etc. He is a and are field reliable. A word of warning – do not rich source of information. Listen to everything he says. You “give it a whiff of refrigerant”...
Page 14 “The selector switch could be open.” Rotate the “The ceiling assembly louvers could be completely selector switch and check for continuity between the closed.” appropriate terminals. This problem is easy to find and it is usually corrected Terminals Switch Position by opening the discharge louvers.
Page 15 Answer: “The voltage could be low – ” “The selector switch may be open to the Check the voltage between #1 on the compressor.” overload switch and the “R” terminal of the compressor while it is not humming. This Rotate the switch to the compressor position and voltage must be 115 volts domestic USA check the selector switch terminals (L to 4) with models or 240 volts export/overseas models.
Page 16 Answer: Problem Compressor trips breaker or thermal current “The power is getting to the compressor.” overload. “The start circuit is starting the compressor OK.” Compressor trips circuit breaker or thermal current overload immediately (no hum). Note that this problem is different “The capacitors and relay are providing the starting from the previous one in that in the previous problem, the torque.”...
Page 17 The customer turns the system to fan/low or fan/high and Problem nothing happens. When he turns the selector switch to “Cool”, the compressor starts but still no fan. Compressor cycling off and on. Question: “What could cause the fan to be dead?” The customer says he gets inadequate cooling even though he has several times set the thermostat down to call for a lower Answer:...
Page 18 Question: “What could cause the compressor to draw in coming to a conclusion. overcurrent or to overheat?” The indications of non-condensables in the system Answer: are: “Dirty condenser coil.” Overcurrent Check the appearance of the coil. If it is coated with Higher than normal discharge line lint, cottonwood fuzz, leaves, etc., it is insulated and temperature...
Page 19 “Plugged up cap tube.” entering the return air grille of the air conditioning unit. A cap tube can become stopped up by oil sludge or contaminants in the system. This will only occur if Subtract from this temperature the temperature of the the system has been open to allow moisture or other air immediately leaving the supply air louvers (if it is contaminants to enter the system or if the...
Page 20 TYPICAL WIRING DIAGRAMS 6700 SERIES AIR CONDITIONERS & CEILING ASSEMBLIES...
Page 21 6798-7XX, 6798A7XX SERIES 6799-7XX, 6799A7XX SERIES 6799-8XX SERIES AIR CONDITIONERS & CEILING ASSEMBLIES...
Page 22 7000 & 8000 SERIES 6799A8XX SERIES 6799B8XX SERIES AIR CONDITIONERS...
Page 23 CEILING ASSEMBLY WIRING DIAGRAMS 6759, 7000, 8000 SERIES COOL ONLY 6759, 7000, 8000 SERIES HEAT/COOL...
Page 24 WIRING DIAGRAM FOR 9000 SERIES ROOF MOUNT AIR CONDITIONERS WIRING DIAGRAM FOR 9330X715, 9330X716 HEAT/COOL CEILING ASSEMBLIES...
Page 25 WIRING DIAGRAM 9330X713, 9330X714 COOL ONLY CEILING ASSEMBLIES...
Page 26 RV Products A Division of Airxcel, Inc. P. O. Box 4020 Wichita, KS 67204 1976F141 (12-03)

This manual is also suitable for:

700 series 8000 series 9000 series