Addison DC Series Installation, Operation And Maintenance Manual
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Addison DC Series Installation, Operation And Maintenance Manual

High efficiency packaged air conditioning systems
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INSTALLATION OPERATION and MAINTENANCE MANUAL
High Efficiency Packaged Models DC Series B, Air Conditioning
General Description ..................................3
Unpacking, Inspection ........................3
Design Certification..............................3
Codes & Ordinances ............................3
Installation..............................................3- 6
Unit Location, Clearances ...................3
Curb Installation ...................................3
Rigging...................................................4
Electrical ................................................4
Ductwork ...............................................5
Condensate Piping ...............................5
Gas Piping and Venting ...................5- 6
Cooling System Options .......................6- 8
Hot Gas Bypass ....................................6
Head Pressure Control.........................6
Variable Speed Control ........................6
Hot Water Heat Recovery.................7, 8
Mechanical Adjustments ....................9, 10
Evaporator Blower Fan ..................9, 10
Electrical System Options ......................10
Air Flow Switch...................................10
!
WARNING: READ SAFE OPERATION RULES AND MANUAL CAREFULLY
1
Systems, Model Sizes 036 Thru 420
No Heat Recovery Cabinet
Extended Heat Recovery Cabinet

TABLE OF CONTENTS

Clogged Filter Indicator ..........................10
Convenience Outlet ............................10
Exhaust Fan Interlock ........................10
Power Through the Curb ...................10
Firestat.................................................10
TM
Sure-Trip
..........................................10
DDC controls.......................................10
Sequence of Operation ...........................11
Heating, Steam/Hydronic ...................11
Gas Heat ..............................................11
Electric Heat ........................................11
Trouble Shooting Guides...................13-18
Varispeed™ Condenser Control .......15
Hot Gas Bypass Regulator ................16
Gas Furnace ........................................17
R410A

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  • Page 1: Table Of Contents

    INSTALLATION OPERATION and MAINTENANCE MANUAL High Efficiency Packaged Models DC Series B, Air Conditioning Systems, Model Sizes 036 Thru 420 R410A No Heat Recovery Cabinet Extended Heat Recovery Cabinet TABLE OF CONTENTS Safety Labeling and Signal Words...2 Clogged Filter Indicator ......10 General Description ........3...
  • 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

    Form #527I-1053 (0703) SAFETY LABELING AND SIGNAL WORDS Danger, Warning and Caution Danger Label The signal words DANGER, WARNING and White lettering on a black background except the word CAUTION are used to identify levels of hazard DANGER which is white with a red background. seriousness.

  • Page 4: General Description

    Curb Installation, Protrusions structural design is governed by the type of soil and Proper installation for the DC series requires that the roof climatic conditions. The slab must not be in contact with mounting, field assembled curb be firmly and permanently any part of the building wall or foundation.

  • Page 5: Rigging

    (or other lifting device) capacity is adequate It is recommended that an independent 115-volt power for the unit weight. See Addison specification literature for source be brought to the vicinity of the rooftop unit for weights. The total unit weight calculated must include all portable lights and tools used by the service mechanic.

  • Page 6: Ductwork

    Ductwork Properly sized and installed ductwork is critical to reliable performance of the unit and system. The DC Series B is field convertible for down flow or left and right horizontal supply and return duct connections. The DC Series B is shipped from the factory with all duct connections capped off.

  • Page 7: Cooling System Options

    INSTALLATION CONTINUED Clearances All combustible materials must be kept out of the area. A Adequate clearance around the unit must be kept for safety, accessibility, service, and maintenance. 48 inches 48 inch clearance is also required on the front (outside air) clearance is required on the rear (furnace and electrical) end of the unit for blower removal and for adequate end of the unit.

  • Page 8: Adjustable High And Low Pressure

    50°F to 53°F, the variable speed fan will ramp between fan cycles. The start-stop cycle varies from 45 seconds to maximum and minimum speed while the constant speed 2½ minutes during this period. COOLING SYSTEMS OPTIONS At 53°F, both fans are operating; the variable speed at Adjustable High and Low Pressure Switches minimum RPM and the constant speed at full RPM.
  • Page 9 6. Turn the motor adjustment bolt counterclockwise until the belt is slack enough to come off easily. 7. Remove the belt. Do NOT pry off belt. 8. Loosen set screw(s) on the outer half of the adjustable pulley. DRIVE BELT TENSION AND ALIGNMENT 9.

  • Page 10: Electrical System Options

    Information can also be obtained thru Power Through the Curb. On curb mounted downflow the application department at Addison, See last page for units, a sleeve can be installed in the compressor section contact information.

  • Page 11: Sequence Of Operation

    SEQUENCE OF OPERATION Heating, Hydronic or Steam Both hydronic and steam heat require a one or two row Electric Heat coil generally located downstream of the evaporator coil. 1. DC units that use the down flow discharge. The Controls for hydronic heat will involve a 3 way motorized installer MUST use an “L”...

  • Page 12: Energy Conservation Wheel

    ENERGY CONSERVATION WHEEL bearing which should be greased annually. Use a Before starting up the unit, check the following: petroleum based lubricant. 1. Does the rotor rotate freely by hand? If not, recheck the seal to determine whether or not it is Drive Motor binding and if so adjust seals following the instructions The drive motors should require no maintenance.

  • Page 13: Trouble Shooting Guides

    TROUBLE SHOOTING GUIDES General Refrigeration Circuit SYMPTOM POSSIBLE CAUSE REMEDY 1. Power off, loose electrical connections or fuse open. 1. Check disconnect switch, fuses and wiring. Replace parts or repair as necessary. 2. Compressor contactor not closing. 2. Check voltage to contactor coil, transformer, slave relay, system. Replace parts as necessary. A.Compressor will not start 3.
  • Page 14 TROUBLE SHOOTING GUIDES CONTINUED General Refrigeration Circuit SYMPTOM POSSIBLE CAUSE REMEDY 1.Blower rotational noise. 1. Check blower, motor and drive for faulty adjustment or noisy bearings, loose parts, blower out of balance. 2.Air noise. 2. Check ductwork. Air velocity too high. G.Noisy unit operation.
  • Page 15 TROUBLE SHOOTING GUIDES CONTINUED General Refrigeration Circuit Continued SYMPTOM POSSIBLE CAUSE REMEDY 1. Refrigerant undercharge or leak in system. 1. Check subcooling and check for leaks. 2. Evaporator plugged with dirt or ice. 2. Check evaporator, airflow and filter. 3. Check superheat and adjust TXV, check bulb. 3.

  • Page 16: Hot Gas Bypass Regulator

    2. Worn or eroded seating surface on regulator. 2. Replace defective part. 1. Regulator is oversized. 1. Contact Addison manufacturer for correctly sized regulator. C. Regulator hunting 2. Regulator and liquid injection Thermo Valve 2. Increase superheat setting. Dampen bulb response by repositioning.

  • Page 17: Gas Furnace

    TROUBLE SHOOTING GUIDES CONTINUED General Gas Furnace See gas furnace Instruction Manual Included with gas furnace(s) for trouble shooting details. TROUBLE SHOOTING GUIDES CONTINUED Electronic-Regulator SYMPTOM POSSIBLE CAUSE FIELD TEST REMEDY 1. Faulty automatic control valve. 1. Remove wire from valve, if valve doesn’t close —valve is faulty. 1.
  • Page 18 If erratic or pulsating voltage continues, contact Addison. *Control circuits external to the Electronic-Regulator and Amplifier can cause burner malfunction. Always check gas valve to be certain it is turned on, and check limit controls for normal operation.

This manual is also suitable for:

Df seriesB

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