addison instalation operation and maintenance

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    WARNING: READ SAFE OPERATION RULES AND MANUAL CAREFULLY

    INSTALLATION OPERATION and MAINTENANCE MANUAL 100% Outside Air Cooling/Dehumidifying Units High Efficiency Split Systems

    CONTENTS PAGE

    Product Description ................................................3-5 Unit Location...........................................................5, 6 Pre-Installation and Code Requirements..................6 Blower Performance ...................................................7 Condensing Unit Dimensions................................8, 9 Air Handler Unit Dimensions .............................10, 11 Electrical Data ...........................................................12 Low Voltage Wiring ..................................................13 Typical Wiring Diagram .......................................14,15 Piping/Diagram ................................................... 16-18 Leak Testing and Evaluation ...................................17 Preparing Equipment for Operation/Start-Up .........19 Capacity Control .......................................................20 Sequence of Operation.............................................20 Service ..................................................................21-24 Check, Test and Start Form .....................................25

    APPLICATION RCA split cooling/dehumidifying systems are designed to cool and dehumidify 100% outside air for those applications requiring make up air cooling. These units should not be used as the primary source of cooling or heating the conditioned space. Cond. Unit Air Handler Nominal

    Model Model MBH EER* RCA051 V/HCA051 49.4 10.7 RCA061 V/HCA071 61.6 10.3 RCA071 V/HCA071 69.5 10.1 RCA101 V/HCA101 101.4 10.1 RCA141 V/HCA141 127.6 9.9 RCA201 V/HCA201 201.9 11.0 RCA271 V/HCA271 271.9 9.3 RCA361 V/HCA361 339.8 9.9

    * @ 95F DB, 80F WB Air Entering Evaporator and Condenser. Table 1

    Safe Operation Rules Please take a few minutes to read our instructions before you install and use your air conditioner. This will help you obtain the full value from your air conditioner. It will also help you avoid any needless service costs that result from causes we cannot control and cannot cover in our warranty. Follow these rules and the instructions carefully. Failure to do so could cause a malfunction of the air conditioner, resulting in injury, death and/or property damage. Check local codes and utility standards. The installation must comply with their rules. Always shut off electric power before making unit connections or removing any panels. During installation or servicing, be extremely careful to avoid injury. Components may have sharp edges or protrusions which can cut you. Tubing and compressor contain high pressure refrigerantthey must not be exposed to high temperature or be punctured.

    Form # 0527N-0598 Rev. B (0897)

    !

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    SAFETY LABELING AND SIGNAL WORDS Danger, Warning and Caution The signal words DANGER, WARNING and CAUTION are used to identify levels of hazard seriousness. The signal word DANGER is only used on product labels to signify an immediate hazard. The signal words WARNING and CAUTION will be used on product labels and throughout this manual and other manuals that may apply to the product. Signal Words DANGER Immediate hazards which WILL result in severe personal injury or death. WARNING Hazards or unsafe practices which COULD result in severe personal injury or death. CAUTION Hazards or unsafe practices which COULD result in minor personal injury or product or property damage. Signal Words in Manuals The signal word WARNING is used throughout this manual in the following manner: The signal word CAUTION is used throughout this manual in the following manner: CAUTION Product Labeling Signal words are used in combination with colors and/or pictures on product labels. Following are examples of product labels with explanations of the colors used.

    Operational failure of this unit for any reason, including but not limited to mechanical or electrical failure of devices internal or external to the unit, loss of fuel such as natural or LP gas, or interruption of electric power may result in the introduction of large volumes of air into the conditioned space that could cause freeze or other damage to property. It is the responsibility of the installer and/or user of this unit to provide equipment such as a source of emergency heat, alarm systems, or supervisory systems to warn of such failures.

    Electric Shock Hazard. Turn Off All Power Before Servicing.

    Fire Hazard. Use copper wire only. Failure to observe could result in property damage, bodily injury or death.

    WARNING !

    Danger Label White lettering on a black background except the word DANGER which is white with a red background.

    Warning Label White lettering on a black background except the word WARNING which is white with an orange background.

    DANGER !

    Cuts and Abrasion Hazard. Wear gloves and handle with care. Failure to observe could result in bodily injury.

    CAUTION !

    Caution Label White lettering on a black background except the word CAUTION which is white with a yellow background.

    WARNING !

    CAUTION

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    PRODUCT DESCRIPTION THE CONDENSING UNIT CONSISTS OF THE FOLLOWING COMPONENTS: Compressor: A welded hermetic compressor used in model sizes 051 through 141 and a serviceable semi-hermetic compressor in model sizes 201 and larger. All compressors have crankcase heaters and the motors are equipped with internal-overload protection (4D compressors use solid state module).The serviceable semi-hermetic compressors are also equipped with isolation valves and oil pressure failure protection. Condenser: The condenser coils are aluminum plate finned formed on multiple rows of seamless copper tubing arranged in a staggered tube configuration. Condenser Air Fan(s): Each condenser air fan is a propeller type, electronically balanced and direct-driven. Condenser air is drawn through the coil(s) horizontally and discharged vertically. Therefore, heated air can not be recirculated. A vinyl coated fan guard is provided. Condenser Fan Motor(s): On standard RCA units the fan motors are single phase and are controlled by a low ambient head pressure control, which cycles the fan, or fans to maintain high side pressure. Units with optional hot gas reheat are different. One condenser fan is direct-driven by a 1075 rpm single phase PSC fan motor, and it is controlled by a variable speed head pressure control. This electronic device is factory set for proper operation. The inherently protected motor has sealed ball bearings that do not require lubrication. On dual and multiple fan units, the other condenser fan motor(s) are three phase and are controlled by a separate low ambient control. REFRIGERANT CIRCUIT COMPONENTS Accumulator: A storage tank located in the suction line of the system. It separates the liquid refrigerant to protect the compressor from liquid slugging by allowing small amount of liquid refrigerant to boil away before entering the compressor. Filter-Drier (liquid): A filter used in the refrigerant line to remove moisture and small particles. High Pressure Safety Control: A manual-reset high pressure control switch will stop the compressor if the system pressure exceeds 400 PSIG. This protects the compressor in case of blockage in the high side of the system. Low Pressure Control/Loss of Charge Protector: An automatic-reset low pressure control switch will stop the compressor if the low side of the system pressure drops below 30 PSIG. This is to protect the compressor in case of blockage in the low side of the system or loss of charge. This control is also used as an operating control-recycling pumpdown. Dual Service Connections: Used for high and low pressure readings. 24 Volt Pump Down Solenoid Valve: Shipped loose with the condensing unit and is to be field installed in the liquid line as close to the evaporator, at the air handling unit, as

    possible. The liquid line solenoid is factory installed on units with hot gas reheat. Hot Gas Bypass Circuit: Provided for capacity control by maintaining a constant suction pressure at the compressor. Consists of an adjustable pressure regulator which introduces compressor discharge gas into the evaporator, providing a false load. ELECTRIC CONTROLS Internally wired controls include; Compressor Anti-Short Cycle Timer: Prevents the compressor from rapid starting and stopping due to power interruptions. Fan and Compressor Motor Contactors or Starters: These controls are rated for the connected load. 24 Volt Transformer: Mounted in the sheet metal control panel. The 24 Volt control circuit includes a low voltage terminal board. Condenser Fan Cycling Head Pressure Control: The standard RCA unit utilizes this control to assure adequate head pressure control during low ambient conditions. This head pressure control system cycles the condenser fans off at 180 PSIG and on at 250 PSIG. This setting will be adequate for most systems. If trim adjustment is made, maintain wide differential to prevent rapid cycling of the fan motor. On systems with optional hot gas reheat this low ambient control is only used for the additional fan motor(s). The recommended settings are as follows; cut-off at 230 PSIG, and cut in at 280 PSIG. Variable Speed Condenser Head Pressure Control: (furnished with hot gas reheat) Condenser head pressure is controlled by a variable speed control located in the compressor section. Through sensing of compressor discharge pressure, the voltage to the fan motor is adjusted to speed up or slow down the condenser fan speed. This action produces relatively constant discharge pressure at varying load and ambient conditions. The control is factory set to ensure consisten