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INSTALLATION OPERATION and MAINTENANCE MANUAL
100% Outside Air Cooling/Dehumidifying Units
High Efficiency Packaged PCA/DCA Systems
!
WARNING: READ SAFE OPERATION RULES AND MANUAL CAREFULLY
APPLICATION
PCA Series endflow packaged and DCA Series Down
discharge air conditioners 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.
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.
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.
CONTENTS
Safety Labeling and Signal Words...................... 2
General Description ............................................ 3
Unit Location ...................................................... 3
Installation.................................................. 3, 4, 5
Sequences of Operation ................................ 5-10
Start-up Procedures.......................................... 10
Service.........................................................11, 12
Typical Wiring Diagrams...............................13-16
Adjustable Belt Drive Blower............................ 17
General Service Guide ..................................18-20
Check, Test and Start Form .............................. 21
CAUTION
PAGE
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
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
compressor(s) contain high pressure refrigerant-they
must not be exposed to high temperature or be
punctured.
utility
standards.
The
cut
you.
Tubing
and
Form #0527N-0831B (0609)

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Summary of Contents for Addison DCA Series

  • Page 1: Table Of Contents

    Follow these rules and the instructions carefully. APPLICATION Failure to do so could cause a malfunction of the air PCA Series endflow packaged and DCA Series Down conditioner, resulting in injury, death and/or property discharge air conditioners are designed to cool and damage.
  • Page 2 ® installation and service of equipment sold and supplied by Addison and conform to all requirements set forth in the ADDISON manuals and all applicable governmental authorities pertaining to the installation, service, operation and labeling of the equipment. To help facilitate optimum performance and ®...
  • Page 3: Safety Labeling And Signal Words

    SAFETY LABELING AND SIGNAL WORDS Danger, Warning and Caution Danger Label White lettering on a black background except the word signal words DANGER, WARNING DANGER which is white with a red background. CAUTION are used to identify levels of hazard seriousness.
  • Page 4: General Description

    GENERAL DESCRIPTION inspection by carrier’s agent should be made in writing at Model PCA and DCA. once. These cooling only 100% outside-air units may be roof mounted on a factory supplied roof curb, slab mounted, Codes and Ordinances or installed on post and rails. Air is drawn into the Local authorities having jurisdiction should be consulted outside air intake located on the end of the unit and before installations are made to verify local codes and...
  • Page 5 INSTALLATION Continued UNIT INSTALLATION Lower unit carefully onto roof mounting curb or mounting rails or ground level slab. While rigging unit, center of gravity will cause condenser end to be lower than supply/return air end. Bring condenser end of unit into alignment with curb.
  • Page 6: Sequences Of Operation

    INSTALLATION CONTINUED A means of disconnecting power from the unit must be Once it is established that supply voltage is within the placed adjacent to the unit in accordance with National utilization range; check and calculate if an unbalanced Electrical Code or local codes. Aluminum power wire is condition exists between phases.
  • Page 7 SEQUENCES OF OPERATION CONTINUED If the application calls for a closer setting between Optional Hot Gas Reheat maximum and minimum pressure settings on the Factory installed hot gas reheat circuit includes outlet constant speed fan, for example 275 psig on, 240 psig regulator valve, check valves, hot gas solenoid operated off, the effect will be t o lengthen the temperature span control valve, variable speed condenser head pressure...
  • Page 8 Addison’s patented Reheat Plus adds a subcooling increased evaporator capacity of 1⁄2%. Thus, a typical coil to the Addison Hot Gas Reheat System. Its use is 35°-40° of subcooling will result in increased unit especially applicable to 100% Outdoor Air systems, or to...
  • Page 9 SEQUENCES OF OPERATION CONTINUED stops. The Liquid Line Solenoid (LLS) opens when the Reheat Operation unit starts. If the system has a pumpdown circuit (larger The hot gas reheat option includes differential pressure units, reciprocating compressors), when there is no regulator, check valve, hot gas solenoid operated valve, longer a call for cooling, the LLS closes, the unit pumps VARISPEED variable speed condenser head pressure...
  • Page 10: Start-Up Procedures

    SEQUENCES OF OPERATION CONTINUED Hot Gas Bypass Optional Clogged Filter Indicator Hot gas bypass is a means of capacity control during Dirty or clogged filters are red flagged by an indicator lower ambient temperature conditions. when the preset pressure differential across the filters is reached.
  • Page 11: Preparing Equipment For Operation

    START-UP PROCEDURES CONTINUED CAUTION If blower rotation is incorrect, shut electric power instance, if the unit is manually shut off when the OFF at unit disconnect and reverse any two supply compressors are running and the unit i s turned back on wires at field connections ONLY.
  • Page 12: Service

    Retighten all electric connections. Bearings require no maintenance since sealed ball The Standard base pan of all Addison Products roof bearings are used in the blower motor and condenser mounted packaged heating and cooling products is fan motors. Lubrication is thus provided for the life of the equipped with a series of “weep”...
  • Page 13 The “weep” holes are not condensate drains, and need automatic drainage. not be trapped. They may be plugged or left open for SERVICE CONTINUED PROCEDURE FOR COMPRESSOR REPLACEMENT Isolate the compressor and remove t h e refrigerant from After two weeks, recheck oil acidity to see if another system.
  • Page 14 TYPICAL 208/230-1-60 WIRING DIAGRAM...
  • Page 15 TYPICAL 208/230-3-60 WIRING DIAGRAM...
  • Page 16 TYPICAL 460-3-60 WIRING DIAGRAM...
  • Page 17 TYPICAL 380/415-3-50 WIRING DIAGRAM...
  • Page 18: Adjustable Belt Drive Blower

    ADJUSTABLE BELT DRIVE BLOWER 9. The unit has one of two different types of Personal injury hazard. adjustable pulleys. Use extreme care during the following procedures 10. Remove key if unit has a keyway type pulley. and obey Safety Information. 11.
  • Page 22 NOTES...
  • Page 23 NOTES...
  • Page 24 All installations and service of ADDISON equipment must be performed by a contractor qualified in the installation and service of equipment sold and supplied by Addison and conform to all requirements set forth in the ADDISON manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help...

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