Johnson Controls MagnaDRY DK-15 Installation Manual
  1. Manuals
  2. Brands
  3. Johnson Controls Manuals
  4. Air Conditioner
  5. MagnaDRY DK-15
  6. Installation manual

Johnson Controls MagnaDRY DK-15 Installation Manual

Gas/electric single package air conditioners
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
INSTALLATION
MANUAL
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . .4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . . . .6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . . . . .63
START-UP (GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . .64
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . .66
See the following pages for a complete Table of Contents.
NOTES, CAUTIONS AND WARNINGS
The installer should pay particular attention to the words:
NOTE, CAUTION, and WARNING. Notes are intended to
clarify or make the installation easier. Cautions are given
to prevent equipment damage. Warnings are given to
alert installer that personal injury and/or equipment dam-
age may result if installation procedure is not handled
properly.
CAUTION: READ ALL SAFETY GUIDES BEFORE
YOU BEGIN TO INSTALL YOUR UNIT.
SAVE THIS MANUAL
MagnaDRY™
GAS/ELECTRIC SINGLE PACKAGE
AIR CONDITIONERS
MODELS: DK-15, -20 & -25
335226-BIM-B-1008

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MagnaDRY DK-15 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Johnson Controls MagnaDRY DK-15

Summary of Contents for Johnson Controls MagnaDRY DK-15

  • Page 1 INSTALLATION MagnaDRY™ MANUAL GAS/ELECTRIC SINGLE PACKAGE AIR CONDITIONERS CONTENTS MODELS: DK-15, -20 & -25 GENERAL ........4 SAFETY CONSIDERATIONS .

  • Page 2: Table Of Contents

    HEAT DELAY SETUP......76 ECONOMIZER WITH DUAL ENTHALPY SENSORS - ..53 OPTIONAL VAV CONTROL BOARD FLASH CODES ..76 Johnson Controls Unitary Products...
  • Page 3 37 HEAT DELAY ....... 76 38 VAV CONTROL BOARD FLASH CODES ..76 39 REHEAT CONTROL BOARD FLASH CODES ..76 Johnson Controls Unitary Products...

  • Page 4: General

    Wear safety glasses and work gloves, and follow all safety codes. Use a quenching cloth and have a fire • Technical Guide: 347129 extinguisher available for all brazing operations. • General Installation: 335226 Johnson Controls Unitary Products...

  • Page 5: Renewal Parts

    For use with natural gas or propane gas. This product must be installed in strict compli- ance with the enclosed installation instructions and any applicable local, state, and national codes including, but not limited to, building, electrical, and mechanical codes. Johnson Controls Unitary Products...

  • Page 6: Product Nomenclature

    M = Options 1, 2, 3, & 4 Z = Options 3, 4 & 5 Options 1 = Disconnect 4 = Smoke Detector R.A. 2 = Non-Pwr'd Conv. Outlet 5 = Pwr'd Conv. Outlet 3 = Smoke Detector S.A. Johnson Controls Unitary Products...

  • Page 7: Installation

    AE-011-07 or call the applications department for Unitary Products @ 1-877-UPG- SERV for guidance. Additional accessories may be needed for stable operation at temperatures below 30°F. Johnson Controls Unitary Products...

  • Page 8: Location

    (e.g. perchloro- ethylene), printing inks, paint removers, var- nishes, hydrochloric acid, cements and glues, 47.5" (15, 20, 25 TON) antistatic fabric softeners for clothes dryers, masonry acid washing materials. FIGURE 2 - CENTER OF GRAVITY Johnson Controls Unitary Products...

  • Page 9: Clearances

    18 inches wide in the ductwork to accommodate the waterproofed. damper. Using the holes in the hood flanges as a tem- plate, drill 9/64 inch dia. (#26 drill) holes into the duct- work and secure with the screws provided. Johnson Controls Unitary Products...

  • Page 10: Condensate Drain

    MUST be trapped to provide proper drain- panels. age. See Figure 4. Make sure that all screws and panel latches are replaced and properly positioned on the unit to maintain an airtight seal. FIGURE 4 - RECOMMENDED DRAIN PIPING Johnson Controls Unitary Products...

  • Page 11: Typical Field Wiring

    TYPICAL THERMOSTAT ( RCB ) REHEAT CONTROL BOARD TERMINAL BLOCK DEHUMIDISTAT Dehumidistat closes on rise in humidity. TERMINAL BLOCK TB1 FACTORY OR FIELD GROUND SUPPLIED DISCONNECT THREE PHASE POWER SUPPLY FIGURE 5 - TYPICAL FIELD WIRING Johnson Controls Unitary Products...

  • Page 12: Thermostat

    Fuses are supplied, where required, by the factory. required. Some KW sizes require fuses and others do not. Refer to Table 3 for minimum CFM limitations and to Tables 9 thru 14 for electrical data. Johnson Controls Unitary Products...

  • Page 13: Optional Gas Heat

    All units require a one-inch pipe connection at Maximum capacity of pipe in cubic feet of gas per hour. (Based upon the entrance fitting. a pressure drop of 0.3 inch water column and 0.6 specific gravity gas). Johnson Controls Unitary Products...

  • Page 14: Gas Connection

    Shellac base compounds nace. such as Gaskolac or Stalastic, and compounds such as Rectorseal #5, Clyde's or John Crane may be used. Johnson Controls Unitary Products...

  • Page 15: L.p. Units, Tanks And Piping

    The screen for the combustion air intake hood is ture of the liquid and (b) the "wetted surface" area secured to the inside of the access panel opening with of the container or containers. four fasteners and the screws used for mounting the Johnson Controls Unitary Products...

  • Page 16: Optional Economizer/Motorized Damper Rain

    For a dual enthalpy operation, carefully turn the and return air divider baffles, and all the control sen- setpoint adjusting screw fully clockwise past the sors are factory mounted as part of the "Factory "D" setting. installed" economizer option. Johnson Controls Unitary Products...

  • Page 17: Power Exhaust Damper Setpoint

    This modulating speed reference signal is generated damper position at which the power exhaust is needed. using an internal algorithm which continuously calcu- The adjustment screw can be set between 25 to 85 lates an output value. degrees open. Johnson Controls Unitary Products...
  • Page 18 LIMIT 2 - a 24 VAC binary input which either con- tube may not be located at the place of highest firms 2nd-stage gas heat operation or receives an pressure in the system). error signal from the variable frequency drive. Johnson Controls Unitary Products...

  • Page 19: Factory-Installed Vfd

    LINE (BYPASS) position and there are VAV boxes present in the duct sys- tem, then boxes must be driven to the full-open position using a customer-supplied power source to prevent over-pressurizing and possi- ble damage to the ductwork. Johnson Controls Unitary Products...

  • Page 20: Vfd-Ready' For Customer-Installation

    0 and 80 psig with a factory-setting nected after the drive is installed. of 60 psig. HGBP is standard on all units with VAV and optional with CV units. Johnson Controls Unitary Products...

  • Page 21: Enthalpy Setpoint Adjustment

    Damper Min. Position Screw Indoor Air Quality Max. Adjustment Screw Indoor Air Quality Indoor Air Quality Min. Adjustment Screw Free Cool Free Cooling LED Economizer Enthalpy Set Point Adjustment Screw FIGURE 10 - HONEYWELL ECONOMIZER CONTROL W7212 Johnson Controls Unitary Products...

  • Page 22: Four And Six Point Loads

    -20 Gas 3150 -25 Gas 3250 -15 Elec 2650 -20 Elec 2950 -25 Elec 3050 Weight includes unit, economizer, economizer rain hood and high option heat (gas or electric). FIGURE 11 - FOUR AND SIX POINT LOADS Johnson Controls Unitary Products...

  • Page 23: Physical Data

    WOOD SKID TABLE 8: SUPPLY FAN VFD WEIGHTS, IN LBS. SUPPLY FAN MOTOR 230V 460V 575V W/O MANUAL BYPASS 5.0 hp 7.5 hp 10.0 hp 15.0 hp W/MANUAL BYPASS 5.0 hp 7.5 hp 10.0 hp 15.0 hp Johnson Controls Unitary Products...

  • Page 24: Electrical Data - Standard Drive Motor W/O Powered Convenience

    NOTE 1: HACR Type per NEC. VOLTAGE LIMITATIONS ELECTRIC HEAT CORRECTION FACTORS VOLTAGE NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER POWER SUPPLY MIN. MAX. 1.00 VOLTAGE 208/230-3-60 0.92 460-3-60 0.92 LIMITATIONS 575-3-60 0.92 Utilization Range “A” in accordance with ARI Standard 110. Johnson Controls Unitary Products...

  • Page 25: Electrical Data - High Static Drive Motor W/O Powered Convenience

    NOTE 1: HACR Type per NEC. VOLTAGE LIMITATIONS ELECTRIC HEAT CORRECTION FACTORS VOLTAGE NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER POWER SUPPLY MIN. MAX. 1.00 VOLTAGE 208/230-3-60 0.92 460-3-60 0.92 LIMITATIONS 575-3-60 0.92 Utilization Range “A” in accordance with ARI Standard 110. Johnson Controls Unitary Products...

  • Page 26: Electrical Data - Low Static Drive Motor W/O Powered Convenience

    NOTE 1: HACR Type per NEC. VOLTAGE LIMITATIONS ELECTRIC HEAT CORRECTION FACTORS VOLTAGE NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER POWER SUPPLY MIN. MAX. 1.00 VOLTAGE 208/230-3-60 0.92 460-3-60 0.92 LIMITATIONS 575-3-60 0.92 Utilization Range “A” in accordance with ARI Standard 110. Johnson Controls Unitary Products...

  • Page 27: Electrical Data - Standard Drive Motor With Powered Convenience

    NOTE 1: HACR Type per NEC. VOLTAGE LIMITATIONS ELECTRIC HEAT CORRECTION FACTORS VOLTAGE NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER POWER SUPPLY MIN. MAX. 1.00 VOLTAGE 208/230-3-60 0.92 460-3-60 0.92 LIMITATIONS 575-3-60 0.92 Utilization Range “A” in accordance with ARI Standard 110. Johnson Controls Unitary Products...

  • Page 28: Electrical Data - High Static Drive Motor With Powered Convenience

    NOTE 1: HACR Type per NEC. VOLTAGE LIMITATIONS ELECTRIC HEAT CORRECTION FACTORS VOLTAGE NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER POWER SUPPLY MIN. MAX. 1.00 VOLTAGE 208/230-3-60 0.92 460-3-60 0.92 LIMITATIONS 575-3-60 0.92 Utilization Range “A” in accordance with ARI Standard 110. Johnson Controls Unitary Products...

  • Page 29: Electrical Data - Low Static Drive Motor With Powered Convenience

    NOTE 1: HACR Type per NEC. VOLTAGE LIMITATIONS ELECTRIC HEAT CORRECTION FACTORS VOLTAGE NOMINAL VOLTAGE VOLTAGE kW CAP. MULTIPLIER POWER SUPPLY MIN. MAX. 1.00 VOLTAGE 208/230-3-60 0.92 460-3-60 0.92 LIMITATIONS 575-3-60 0.92 Utilization Range “A” in accordance with ARI Standard 110. Johnson Controls Unitary Products...

  • Page 30: Dimensions

    Opening in the bottom of the unit can be located by the slice in the insulation. NOTE: All entry holes should be field sealed to prevent rain water entry into the building. FIGURE 12 - FRONT VIEW DIMENSIONS Johnson Controls Unitary Products...
  • Page 31 Remove and discard the bottom duct covers. Duct openings are closed with sheet metal covers except when the unit includes a power exhaust option. The covering consists of a heavy black paper composition. Replace the side supply and return air compartment panels. Johnson Controls Unitary Products...

  • Page 32: Unit Clearances And Rain Hood

    INTAKE HOOD (located on Return Air Compartment) 36-5/8” 1“ CONDENSATE DRAIN 16-1/8” (Must be trapped) 5” 28-3/16” 92” REAR VIEW LH VIEW DETAIL “Y” UNIT WITH RAIN HOODS FIGURE 14 - UNIT CLEARANCES AND RAIN HOOD DIMENSIONS Johnson Controls Unitary Products...

  • Page 33: Cfm, Static Pressure, And Power - Altitude And Temperature Corrections

    This value must be corrected for elevation. Example 2: A system, located at 5,000 feet of elevation, is to BHP at 5,000 ft = 3.2 x .832 = 2.66 deliver 6,000 CFM at a static pressure of 1.5". Use the unit Johnson Controls Unitary Products...
  • Page 34 335226-BIM-B-1008 ltitude/Temperature Conversion Factor SEA LEVEL TEMPER TURE (°F) FIGURE 15 - ALTITUDE/TEMPERATURE CONVERSION FACTOR Johnson Controls Unitary Products...
  • Page 35 6 turns 15-Ton Standard Drive, Cooling Only, Bottom Connection 1VP56 x BK105 7000 6500 1 Turn 2 Turns 6000 3 Turns 4 Turns 5500 5 Turns 5000 6 Turns 4500 4000 3500 3000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 36 15-Ton High Static Drive, Cooling Only, Bottom Connection 1VP60 x BK90H 8500 1 Turn 8000 2 Turns 7500 3 Turns 7000 4 Turns 5 Turns 6500 6 Turns 6000 5500 5000 4500 4000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 37 6 turns 15-Ton Standard Drive, Gas Heat, Bottom Connection 1VP56 x BK105 7000 6500 1 Turn 6000 2 Turns 3 Turns 5500 4 Turns 5 Turns 5000 6 Turns 4500 4000 3500 3000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 38 15-Ton High Static Drive, Gas Heat, Bottom Connection 1VP60 x BK90H 8500 8000 1 Turn 2 Turns 7500 3 Turns 7000 4 Turns 5 Turns 6500 6 Turns 6000 5500 5000 4500 4000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 39 5 HP motor 20-Ton Standard Drive, Cooling Only, Bottom Connection VP68 x BK110 10000 2 Turns 1 Turn 9000 3 Turns 4 Turns 8000 5 Turns 6 Turns 7000 6000 5000 4000 3000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 40 20-Ton High Static Drive, Cooling Only, Bottom Connection VP71 x BK110 11000 10500 2 Turns 10000 3 Turns 1 Turn 9500 4 Turns 5 Turns 9000 6 Turns 8500 8000 7500 7000 6500 6000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 41 5 HP motor 20-Ton Standard Drive, Gas Heat, Bottom Connection VP68 x BK110 10000 1 Turn 9000 2 Turns 3 Turns 8000 4 Turns 5 Turns 6 Turns 7000 6000 5000 4000 3000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 42 20-Ton High Static Drive, Gas Heat, Bottom Connection VP71 x BK110 11000 10500 10000 2 Turns 1 Turn 3 Turns 9500 4 Turns 9000 5 Turns 6 Turns 8500 8000 7500 7000 6500 6000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 43 7.5 HP motor 25-Ton Standard Drive, Cooling Only, Bottom Duct Connection 1VP60 & B5V94 11000 10000 1 Turn 2 Turns 9000 3 Turns 4 Turns 5 Turns 8000 6 Turns 7000 6000 5000 4000 3000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 44 7.5 HP motor 25-Ton High-Static Drive, Cooling Only, Bottom Duct Connection 1VP71 & 1B5V94 13000 12000 1 Turn 2 Turns 3 Turns 11000 4 Turns 5 Turns 10000 6 Turns 9000 8000 7000 6000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 45 7.5 HP motor 25-Ton Standard Drive, Gas Heat, Bottom Duct Connection 1VP60 & B5V94 11000 10000 1 Turn 2 Turns 9000 3 Turns 4 Turns 8000 5 Turns 6 Turns 7000 6000 5000 4000 3000 External Static ("WC) Johnson Controls Unitary Products...
  • Page 46 7.5 HP motor 25-Ton High-Static Drive, Gas Heat, Bottom Duct Connection 1VP71 & 1B5V94 13000 12000 1 Turn 2 Turns 11000 3 Turns 4 Turns 5 Turns 10000 6 Turns 9000 8000 7000 6000 External Static ("WC) Johnson Controls Unitary Products...

  • Page 47: Static Resistances

    All motors have a nominal speed of 1800 RPM, a 1.15 service factor and a solid base. They can operate to the limit of their service factor because they are located in the moving air, upstream of any heating device. Do NOT close this pulley below 1 turn open. Johnson Controls Unitary Products...

  • Page 48: Charging Chart - 20 Ton

    85º 75º 65º Suction Pressure (psi) Both fans must be running when charging the unit. One fan may switch off at low ambient temperatures making this chart inaccurate. FIGURE 17 - CHARGING CHART - 20 TON Johnson Controls Unitary Products...

  • Page 49: Charging Chart - 25 Ton

    85º 75º 65º Suction Pressure (psi) Both fans must be running when charging the unit. One fan may switch off at low ambient temperatures making this chart inaccurate. FIGURE 18 - CHARGING CHART - 25 TON Johnson Controls Unitary Products...

  • Page 50: Phasing

    CFM. Adjustments of the blower speed an belt tension are REQUIRED. Tighten blower pulley and motor sheave set screws after these adjustments. Re-checking set screws after 10-12 hrs. run time is recommended. Johnson Controls Unitary Products...

  • Page 51: Air Balance

    FORE TAKING ANY TEST MEASUREMENTS under field conditions would be inaccurate. To TO ASSURE A DRY INDOOR COIL. assure a dry coil, the compressors should be deac- tivated while the test is being run. Johnson Controls Unitary Products...

  • Page 52: Operation

    (if the fan switch on the room thermostat is set in static pressure reaches or exceeds the high-limit set- the "AUTO" position) and drives the economizer damp- point, then the supply fan motor will be shutdown. Johnson Controls Unitary Products...

  • Page 53: Economizer With Dual Enthalpy Sensors

    First-Stage SAT Control setpoint plus 5 °F, while the power exhaust is operating, the second stage of free-cooling is available, then a Y1 call will also initiate mechanical cooling will not operate. As always, the "R" 1st-stage mechanical cooling. Johnson Controls Unitary Products...

  • Page 54: Economizer With Optional Vav Blower With Power Exhaust

    ASCD, and, if the other compressor is idle, stop Each cooling system is monitored for operation outside the condenser fans. If the call for cooling is still present of the intended parameters. Errors are handled as Johnson Controls Unitary Products...

  • Page 55: Low Ambient Cooling

    (opens at 22 ± 5 psig and resets RHTB-2 and there is not a call for cooling, it energizes at 45 ± 5 psig). the hot gas relay (HGR), which energizes the 3-way valve (SOL 3), the condenser coil valve (SOL 2), and Johnson Controls Unitary Products...

  • Page 56: Alternate" Mode

    All safety devices function as previously described. All safety devices function as previously described. Johnson Controls Unitary Products...

  • Page 57: Reheat Control Board

    335226-BIM-B-1008 HGRR DEHUMIDISTAT MODE HARNESS SELECTION CONNECTION JUMPER FIGURE 21 - REHEAT CONTROL BOARD Johnson Controls Unitary Products...

  • Page 58: Unit Control Board

    HUMIDIFY TERMINAL REHEAT RELAY RHTB REHEAT TERMINAL BLOCK FIGURE 22 - REHEAT CONTROLS - PART 1 REHEAT SOLENOID REHEAT REHEAT SOLENOID SOLENOID UNIT CONTROL BOARD REHEAT CONTROL BOARD FIGURE 23 - REHEAT CONTROLS - PART 2 Johnson Controls Unitary Products...

  • Page 59: Electric Heating Sequence Of Operations

    (6M) (6M & 7M on 72 KW, 240V) position using a customer-supplied power will be energized. After completing the specified fan source to assure adequate airflow across the on delay for heating, the UCB will energize the heating elements. blower motor. Johnson Controls Unitary Products...

  • Page 60: Heating Operation Errors

    Refer to Table 32 for the required heat anticipator set- This control is located inside the heater compart- ting. ment and is set to open at the temperature indi- cated in the Limit Control Setting Table 31. It is a Johnson Controls Unitary Products...

  • Page 61: Gas Heating Sequence Of Operations

    The UCB will de-energize the "GV1" to allow a flow of gas to only the first stage carry- blower motor. Johnson Controls Unitary Products...

  • Page 62: Gas Heating Operation Errors

    (Table 36). When voltage is no longer sensed at the power is removed from the module either at the GV, the UCB will de-energize the indoor blower follow- unit or by resetting the room thermostat. ing the elapse of the fan off delay for heating. Johnson Controls Unitary Products...

  • Page 63: Flash Codes

    8. Set the room thermostat fan switch to off. FLASH CODES 9. Turn unit electrical power off. The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 36. Johnson Controls Unitary Products...

  • Page 64: Operating Instructions

    TO LIGHT PILOT AND MAIN BURNERS: operating pressure drop below 5.0" for natural gas 1. Turn “off” electric power to unit. units. If gas pressure is outside these limits, con- tact the local gas utility for corrective action. Johnson Controls Unitary Products...

  • Page 65: Manifold Gas Pressure Adjustment

    C A R R Y - O V E R T U B E rear of the heat exchanger. FIGURE 28 - PROPER FLAME ADJUSTMENT BURNER AIR SHUTTER ADJUSTMENT Adjust burner shutters so no yellow flame is observed in the heat exchanger tubes. Johnson Controls Unitary Products...

  • Page 66: Checking Gas Input

    The temperature rise (or temperature difference between the return air and the heated air from the fur- nace) must lie within the range shown on the rating plate and the data in the Gas Heat Application Table 4. Johnson Controls Unitary Products...
  • Page 67 For units with VFD, if there is line voltage supplied been disabled through computer communications. at M3, M3 is pulled in, and the blower motor does not operate, check all power & control wiring con- Johnson Controls Unitary Products...
  • Page 68 The UCB should be flashing an alarm fault in the economizer wiring or economizer con- code. If not, press and release the ALARMS button trol. on the UCB. The UCB will flash the last five alarms Johnson Controls Unitary Products...
  • Page 69 Cancel any calls for cooling and wait for the inter- an ASCD cycle. The ASCD should time out within nal overload to reset. Test again when cool. 5 minutes. Press and release the TEST button to reset all ASCDs. Johnson Controls Unitary Products...
  • Page 70 5. Failing the above, if voltage is supplied at M1, M1 present at the Y1 “OUT” terminal, the UCB must be is pulled in, and the compressor still does not oper- replaced. ate, replace the compressor. Johnson Controls Unitary Products...

  • Page 71: Gas Heat Troubleshooting Guide

    UCB energize the supply air blower motor until the high temperature limit has reset. Caution should be used at all times as the supply air blower may energize regardless of the room thermostat fan switch position. Johnson Controls Unitary Products...
  • Page 72 7. If 24 volts is not present at the UCB supply air rect, replace the relay board. blower motor terminal, check for 24 volts from the room thermostat. If 24 volts is not present from the room thermostat, check for the following: Johnson Controls Unitary Products...
  • Page 73 3. Make sure that the pilot burner is not bent or dam- not broken or cracked, if all are intact, replace the aged. ignition control IC1 or IC2. Johnson Controls Unitary Products...

  • Page 74: Unit Control Board Flash Codes

    11 Flashes Flashing Cooling 12 Flashes Unit Locked Out due to Fan Overload Switch Failure 13 Flashes Flashing Compressor Held Off due to Low Voltage 14 Flashes EEPROM Storage Failure No Power or Control Failure Non-alarm condition. Johnson Controls Unitary Products...

  • Page 75: Unit Control Board Option Setup

    4 labeled options ((8) Fan Off at Heat Start, (4) saves the parameters for the currently dis- Low Ambient Lockout, (2) Free Cooling Lock- played mode (Option Byte or Heat Delay). out, and (1) Lead / Lag). Johnson Controls Unitary Products...

  • Page 76: Heat Delay Setup

    Y1 and Humidistat. See alt operation No Power or Control Failure Non-std Non-std Subject to change without notice. Printed in U.S.A. 335226-BIM-B-1008 Copyright © 2008 by Johnson Controls, Inc. All rights reserved. Supersedes: 335226-BIM-A-0807 Johnson Controls Unitary Products 5005 York Drive Norman, OK 73069...

This manual is also suitable for:

Magnadry dk-20Magnadry dk-25

Table of Contents