York WW-15 Installation Manual
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York WW-15 Installation Manual

York WW-15 Installation Manual

Gas/electric single package air conditioners
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INSTALLATION
MANUAL
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . .4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . . . .6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . . . . .53
START-UP (GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . .54
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . .56
See the following page 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
GAS/ELECTRIC SINGLE PACKAGE
AIR CONDITIONERS
MODELS: WW-15, -20 & -25
175244-BIM-A-0706

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  • Page 1 GENERAL ........4 MODELS: WW-15, -20 & -25 SAFETY CONSIDERATIONS .

  • Page 2: Table Of Contents

    175244-BIM-A-0706 TABLE OF CONTENTS GENERAL ........ECONOMIZER WITH SINGLE ENTHALPY SENSOR - .
  • Page 3 (COOLING ONLY)....... 39 17 CHARGING CHART - WW-15 ..... . 44 20 WW-20 BLOWER PERFORMANCE - STANDARD DRIVE (GAS HEAT) .

  • Page 4: General

    175244-BIM-A-0706 GENERAL UPG Model WW units are either single package air conditioners equipped with optional factory installed FIRE OR EXPLOSION HAZARD electric heaters, or single package gas-fired central heating furnaces with cooling unit. Both are designed Failure to follow safety warnings exactly could for outdoor installation on a rooftop or slab.

  • Page 5: Renewal Parts

    175244-BIM-A-0706 RENEWAL PARTS Contact your local UPG Parts Distribution Center for authorized replacement parts. APPROVALS INCORRECT INSTALLATION MAY CREATE A CONDITION WHERE THE OPERATION OF Design certified by CSA as follows: THE PRODUCT COULD CAUSE PERSONAL INJURY OR PROPERTY DAMAGE. •...

  • Page 6: Product Nomenclature

    175244-BIM-A-0706 PRODUCT NOMENCLATURE 15-25 Ton Model Number Nomenclature W W -20 N30 A T A AA 1 0 1 2 4 A Product Category Product Style A = Style A W = A/C, Single Pkg., R-22 w/6-Row Evap. Configuration Options (not required for all units) These four digits will not be assigned until a quote is requested, or an order placed.

  • Page 7: Installation

    175244-BIM-A-0706 INSTALLATION LIMITATIONS These units must be installed in accordance with the INSTALLATION SAFETY INFORMATION: following national and local safety codes: Read these instructions before continuing this appli- In U.S.A.: ance installation. This is an outdoor combination heat- ing and cooling unit. The installer must assure that •...

  • Page 8: Location

    175244-BIM-A-0706 TABLE 1: UNIT APPLICATION DATA UNIT MODEL NUMBER WW-15 WW-20 WW-25 208/230-3-60 187 / 253 460-3-60 432 / 504 Voltage Variation, Min. / Max. 575-3-60 540 / 630 Supply Air CFM, Min. / Max. 4,500 / 7,500 6,000 / 9,000 7,500 / 9,300 Wet bulb Temperature (°F) of Air on Evaporator Coil, Min.

  • Page 9: Rigging And Handling

    175244-BIM-A-0706 RIGGING AND HANDLING Exercise care when moving the unit. Do not remove any packaging until the unit is near the place of installa- tion. Rig the unit by attaching chain or cable slings to the round lifting holes provided in the base rails. Spreaders, whose length exceeds the largest dimen- sion across the unit, MUST BE USED.

  • Page 10: Ductwork

    175244-BIM-A-0706 FIXED OUTDOOR AIR INTAKE DAMPER This damper is shipped inside the return air compart- ment. It is completely assembled and ready for installa- Do not permit overhanging structures or shrubs tion. A damper baffle inside of the hood is adjustable to to obstruct outdoor air discharge outlet, com- provide variable amounts of outdoor air intake on units bustion air inlet or vent outlets.

  • Page 11: Condensate Drain

    175244-BIM-A-0706 COMPRESSORS Units are shipped with compressor mountings factory- adjusted and ready for operation. Do not loosen compressor mounting bolts. FILTERS Two-inch filters are supplied with each unit, but units can be converted easily to four-inch filters. Filters must always be installed ahead of the evaporator coil and must be kept clean or replaced with same size and type.
  • Page 12 175244-BIM-A-0706 T H E R M O S T A T T E R M I N A L S UNIT CONTROL R C BOARD R H Y 1 Y 1 Y 2...

  • Page 13: Thermostat

    175244-BIM-A-0706 THERMOSTAT with a separate branch circuit fed directly from the meter panel and properly fused. The room thermostat should be located on an inside wall approximately 56 inches above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances.

  • Page 14: Optional Gas Heat

    175244-BIM-A-0706 OPTIONAL GAS HEAT These gas-fired heaters have aluminized-steel or All gas heaters are shipped from the factory equipped optional stainless steel, tubular heat exchangers with for natural gas use, but can be field converted to L.P./ spark ignition with proven pilot. Propane with Kit Model # 1NP0418.

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

    175244-BIM-A-0706 7. A 1/8 inch NPT plugged tap, accessible for test gage connection, must be installed immediately upstream of the gas supply connection to the fur- nace. Natural gas may contain some propane. Pro- pane, being an excellent solvent, will quickly dissolve white lead or most standard commer- cial compounds.

  • Page 16: Vent And Combustion Air Hoods

    175244-BIM-A-0706 1. The vaporization rate depends on (a) the tempera- 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 hood to the panel.

  • Page 17: Optional Economizer And Power Exhaust Damper Set Point Adjustments And Information

    175244-BIM-A-0706 fan, all supporting brackets, angles, and the wiring are corresponding to the lettered curve of the Enthalpy factory installed as part of the power exhaust option. Setpoint Adjustment Figure 9. • For a dual enthalpy operation, carefully turn the set OPTIONAL ECONOMIZER AND POWER EXHAUST point adjusting screw fully clockwise past the "D"...

  • Page 18: Enthalpy Setpoint Adjustment

    175244-BIM-A-0706 CONTROL POINT CONTROL APPROX. CURVE (29) (32) (35) (38) (41) (43) AT 50% RH 73 (23) 70 (21) (27) 67 (19) 63 (17) (24) (21) (18) (16) (13) (10) (10) (13) (21) (24) (27) (29) (32) (38) (41) (43) (16) (18) (35)

  • Page 19: Optional Reclaim Coil Piping Connection

    175244-BIM-A-0706 OPTIONAL RECLAIM COIL PIPING CONNECTION The temperature required to make or break a brazed joint is sufficient to cause oxidation of copper unless an Remove the left front corner panel to provide access to inert gas such as nitrogen is provided. Drill a small hole the reclaim coil connections (See Figure 13).

  • Page 20: Four And Six Point Loads

    175244-BIM-A-0706 FIGURE 11 - FOUR AND SIX POINT LOADS TABLE 6: FOUR AND SIX POINT LOADS Total 4 Point Loads (lbs) Unit Size Shipping Weight WW-15 Gas 2780 WW-20 Gas 3080 1003 1003 WW-25 Gas 3180 1036 1036 WW-15 Elec...

  • Page 21: Physical Data

    175244-BIM-A-0706 TABLE 7: PHYSICAL DATA MODELS WW-15 WW-20 WW-25 CENTRIFUGAL BLOWER (Dia. x Wd.) 15x15 18x15 EVAPORATOR BLOWER FAN MOTOR HP 5/7.5 10.0/7.5 15.0/7.5 ROWS DEEP EVAPORATOR FINS PER INCH COIL FACE AREA (Sq. Ft.) 20.5 PROPELLER DIA. (In.) (Each)

  • Page 22: Ww Electrical Data W/O Powered Convenience Outlet - Std Drive Motor

    175244-BIM-A-0706 TABLE 8: WW ELECTRICAL DATA W/O POWERED CONVENIENCE OUTLET - STD DRIVE MOTOR COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT MOTORS OUTLET (TON- VOLTAGE BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH SIZE...
  • Page 23 175244-BIM-A-0706 TABLE 8: WW ELECTRICAL DATA W/O POWERED CONVENIENCE OUTLET - STD DRIVE MOTOR (CONT.) COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS AMPS NAGE) FLA EACH SIZE EACH EACH...

  • Page 24: Ww Electrical Data W/O Powered Convenience Outlet - High Static Drive Motor

    175244-BIM-A-0706 TABLE 9: WW ELECTRICAL DATA W/O POWERED CONVENIENCE OUTLET - HIGH STATIC DRIVE MOTOR COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT MOTORS OUTLET (TON- VOLTAGE BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH...
  • Page 25 175244-BIM-A-0706 TABLE 9: WW ELECTRICAL DATA W/O POWERED CONVENIENCE OUTLET - HIGH STATIC DRIVE MOTOR (CONT.) COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH...

  • Page 26: Ww Electrical Data W/O Powered Convenience Outlet - Low Airflow Drive

    175244-BIM-A-0706 TABLE 10: WW ELECTRICAL DATA W/O POWERED CONVENIENCE OUTLET - LOW AIRFLOW DRIVE COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT MOTORS OUTLET (TON- VOLTAGE BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH SIZE...

  • Page 27: Ww Electrical Data W/Powered Convenience Outlet - Std Drive Motor

    175244-BIM-A-0706 TABLE 11: WW ELECTRICAL DATA W/POWERED CONVENIENCE OUTLET - STD DRIVE MOTOR COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH SIZE (AMPS)
  • Page 28 175244-BIM-A-0706 TABLE 11: WW ELECTRICAL DATA W/POWERED CONVENIENCE OUTLET - STD DRIVE MOTOR (CONT.) COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH SIZE...

  • Page 29: Ww Electrical Data W/Powered Convenience Outlet - High Static Drive Motor

    175244-BIM-A-0706 TABLE 12: WW ELECTRICAL DATA W/POWERED CONVENIENCE OUTLET - HIGH STATIC DRIVE MOTOR COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH SIZE...
  • Page 30 175244-BIM-A-0706 TABLE 12: WW ELECTRICAL DATA W/POWERED CONVENIENCE OUTLET - HIGH STATIC DRIVE MOTOR (CONT.) COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS SIZE EACH...

  • Page 31: Ww Electrical Data W/Powered Convenience Outlet - Low Airflow Drive

    175244-BIM-A-0706 TABLE 13: WW ELECTRICAL DATA W/POWERED CONVENIENCE OUTLET - LOW AIRFLOW DRIVE COMPRESSORS HEATER OPTION MAX. MIN. FUSE/ MODEL OD FAN CONV BLOWER CIRCUIT (TON- VOLTAGE MOTORS OUTLET BRKR MOTOR AMPACITY MODEL STAGES AMPS NAGE) FLA EACH AMPS EACH EACH SIZE (AMPS)
  • Page 32 175244-BIM-A-0706 UTILITIES ENTRY DATA OPENING SIZE HOLE USED FOR (DIA.) 1-1/8” KO Side Control Wiring 3/4” NPS (Fem.) Bottom 3-5/8” KO Side Power Wiring 3” NPS (Fem.) Bottom 2-3/8” KO Gas Piping (Front) 1-11/16” Hole Gas Piping (Bottom) One-inch gas piping NPT required. Opening in the bottom of the unit can be located by the slice in the insulation.
  • Page 33 175244-BIM-A-0706 EVAPORATOR SECTION DOT PLUG (For pressure 40-3/8" drop reading) FILTER ACCESS SUPPLY RETURN COMPRESSOR OUTDOOR ACCESS 40-1/2" SUPPLY AIR ACCESS 18-5/8" 1" NPT FEMALE 27-3/4" COND. DRAIN Dimensions listed are for side CONNECTION 5-1/8" RETURN AIR duct flange openings; see ACCESS OUTDOOR AIR Field Accessories for Side...

  • Page 34: Unit Clearances And Rain Hood Dimensions

    175244-BIM-A-0706 NOTE: ELEC / ELEC Models: Units and ductwork are CLEARANCES approved for zero clearance to combustible material LOCATION CLEARANCE when equipped with electric heaters. Front 36” 24” (Less Economizer) Rear GAS / ELEC Models: A 1” clearance must be 49”...

  • Page 35: Cfm, Static Pressure, And Power - Altitude And Temperature Corrections

    175244-BIM-A-0706 CFM, STATIC PRESSURE, AND POWER - ALTI- order to use the indoor blower tables for high altitude applica- tions, certain corrections are necessary. TUDE AND TEMPERATURE CORRECTIONS A centrifugal fan is a "constant volume" device. This means The information below should be used to assist in application that, if the rpm remains constant, the CFM delivered is the of product when being applied at altitudes at or exceeding same regardless of the density of the air.
  • Page 36 175244-BIM-A-0706 FIGURE 16 - ALTITUDE/TEMPERATURE CONVERSION FACTOR Unitary Products Group...
  • Page 37 175244-BIM-A-0706 TABLE 15: WW-15 BLOWER PERFORMANCE - STANDARD DRIVE (COOLING ONLY) TABLE 16: WW-15 BLOWER PERFORMANCE - STANDARD DRIVE (GAS HEAT) Unitary Products Group...
  • Page 38 175244-BIM-A-0706 TABLE 17: WW-15 BLOWER PERFORMANCE - HIGH STATIC DRIVE (COOLING ONLY) TABLE 18: WW-15 BLOWER PERFORMANCE - HIGH STATIC DRIVE (GAS HEAT) Unitary Products Group...
  • Page 39 175244-BIM-A-0706 TABLE 19: WW-20 BLOWER PERFORMANCE - STANDARD DRIVE (COOLING ONLY) TABLE 20: WW-20 BLOWER PERFORMANCE - STANDARD DRIVE (GAS HEAT) Unitary Products Group...
  • Page 40 175244-BIM-A-0706 TABLE 21: WW-20 BLOWER PERFORMANCE - HIGH STATIC DRIVE (COOLING ONLY) TABLE 22: WW-20 BLOWER PERFORMANCE - HIGH STATIC DRIVE (GAS HEAT) Unitary Products Group...
  • Page 41 175244-BIM-A-0706 TABLE 23: WW-25 BLOWER PERFORMANCE - STANDARD DRIVE (COOLING ONLY) TABLE 24: WW-25 BLOWER PERFORMANCE - STANDARD DRIVE (GAS HEAT) Unitary Products Group...
  • Page 42 175244-BIM-A-0706 TABLE 25: WW-25 BLOWER PERFORMANCE - HIGH STATIC DRIVE (COOLING ONLY) TABLE 26: WW-25 BLOWER PERFORMANCE - HIGH STATIC DRIVE (GAS HEAT) Unitary Products Group...

  • Page 43: Static Resistances

    175244-BIM-A-0706 TABLE 27: STATIC RESISTANCES RESISTANCE, IWG DESCRIPTION 15 TON 20 TON 25 TON 4500 6000 7500 6000 8000 9000 7500 8000 9300 WET INDOOR COIL 2 ROW RECLAIM COIL OPTIONS 3 ROW 18 KW 36 KW ELECTRIC HEAT OPTIONS 54 KW 72 KW ECONOMIZER OPTION...
  • Page 44 2. This chart is applicable to unit with the TXV's left to the factory setting. If the TXV's have been adjusted in the field, the charging chart may no longer apply. FIGURE 17 - CHARGING CHART - WW-15 20 Ton Charging Chart (ºF)

  • Page 45: Phasing

    175244-BIM-A-0706 25 Ton Charging Chart (ºF) Outdoor Temp 115º 105º 95º 85º 75º 65º Suction Pressure (psi) 1. Make sure that both condenser fans are running when charging. One fan may switch off at lower ambient temperatures making the chart above inaccurate. 2.

  • Page 46: Air Balance

    175244-BIM-A-0706 measuring the pressure drop across a wet coil under field conditions would be inaccurate. To assure a dry coil, the compressors should be deac- tivated while the test is being run. PRESSURE DROP ACROSS A DRY COIL vs SUPPLY AIR CFM 4000 5000 6000...

  • Page 47: Cooling Sequence Of Operation

    175244-BIM-A-0706 tion is available and, if so, which components to ener- ture is above 60ºF), is energized, provided it has not gize. been locked-out. For gas heating, the UCB monitors the "W1" call but If there is an initial call for both stages of cooling, the does not handle the operation of the gas furnace.

  • Page 48: Economizer With Dual Enthalpy Sensors

    175244-BIM-A-0706 compressor de-energizing, the blower is stopped fol- Should a high-pressure switch open three times within lowing the elapse of the fan off delay for cooling, and two hours of operation, the UCB will lock-out the asso- the economizer damper goes to the closed position. If ciated compressor and flash a code (see Table 35).

  • Page 49: Safety Controls

    175244-BIM-A-0706 ature-activated switch set at 30ºF. When the low ambi- COMPRESSOR PROTECTION ent switch is closed and the thermostat is calling for cooling, the UCB will operate in the low ambient mode. The compressors also have inherent (internal) protec- tion. If there is an abnormal temperature rise in a com- Low ambient mode operates the compressors in this pressor, the protector will open to shut down the manner: 10 minutes on, 5 minutes off.

  • Page 50: Heating Operation Errors

    175244-BIM-A-0706 completing the specified fan on delay for heating, manual reset limit. These limit switches will de- the UCB will energize the blower motor. energize the heaters should the primary limit fail to open or the contactors fail to open in a failure The thermostat will cycle the electric heat to satisfy mode.

  • Page 51: Gas Heating Sequence Of Operations

    175244-BIM-A-0706 24V power is removed from the module either at the TABLE 31: ELECTRIC HEAT ANTICIPATOR unit or by resetting the room thermostat. SETPOINTS SETTING, AMPS HEATER When the thermostat calls for the second stage of VOLTAGE heating, the low-voltage control circuit from "R" to "W2" 0.29 is completed, thru the UCB.

  • Page 52: Gas Heating Operation Errors

    175244-BIM-A-0706 has been sensed at “W1”, the UCB will initiate the fan 1. Limit Control (LS). on delay for heating, energizing the indoor blower after the specified delay has elapsed. This control is located inside the heat exchanger compartment and is set to open at the temperature When the thermostat has been satisfied, heating calls indicated in the Limit Control Setting Table 32.

  • Page 53: Flash Codes

    175244-BIM-A-0706 6. Auxiliary limit switch (AUX) - and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint This control is located inside the heat exchanger will give shorter "ON" cycles and may result in the low- compartment and is set to open at 190°F.

  • Page 54: Post Start Check List

    175244-BIM-A-0706 4. The second stage of the thermostat will energize 5. Set room thermostat to desired temperature. second stage compressor if needed. (If thermostat “set” temperature is above room tem- perature, pilot burner ignition will occur and, after POST START CHECK LIST an interval to prove pilot flame, main burners will ignite).

  • Page 55: Manifold Gas Pressure Adjustment

    175244-BIM-A-0706 cover screw after adjustment to prevent possible gas leakage. Put the system into operation and observe through complete cycle to be sure all controls function properly. BURNER INSTRUCTIONS To check or change burners, pilot or orifices, CLOSE MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELECTRIC POWER TO THE UNIT.

  • Page 56: Adjustment Of Temperature Rise

    175244-BIM-A-0706 2. With the furnace turned on, measure the time Btuh Input x 0.8 needed for one revolution of the hand on the small- x F Temp Rise est dial on the meter. A typical gas meter usually has a 1/2 or a 1 cubic foot test dial. After the temperature rise has been determined, the cfm can be calculated as follows: 3.
  • Page 57 175244-BIM-A-0706 On calls for cooling, if the compressors are operating 9. If 24 volts is present at the room thermostat but not but the supply air blower motor does not energize after at the UCB, check for proper wiring between the a short delay (the room thermostat fan switch is in the thermostat and the UCB, i.e.
  • Page 58 175244-BIM-A-0706 Y1 terminal. If 24 volts is not present from the room Lock plug, and in the wiring from the Mate-N-Lock thermostat, check for the following: a) 24 volts at plug to the Y1 “ECON” terminal. the thermostat Y1 terminal, b) proper wiring between the room thermostat and the UCB, i.e.
  • Page 59 175244-BIM-A-0706 compressor #1 will be energized unless it is locked UCB may have locked out the compressor for out. Typically, compressor #2 is energized only repeat trips. The UCB should be flashing a code. If during free cooling if the call for the second stage not, press and release the ALARMS button on the of cooling persists for 20 minutes.
  • Page 60 175244-BIM-A-0706 compressor #1 is locked out. Press and release UCB. The UCB will flash the last five alarms on the the ALARMS button if the LED is not flashing an LED. If the compressor is locked out, remove any alarm. call for cooling.

  • Page 61: Gas Heat Troubleshooting Guide

    175244-BIM-A-0706 13. The UCB can be programmed to lock out compres- To find the Btu input, multiply the number of NOTE: sor operation during free cooling and in low ambi- cubic feet of gas consumed per hour by the ent conditions. These options are not enabled by Btu content of the gas in your particular locality default.
  • Page 62 175244-BIM-A-0706 terminal, check for loose wiring between the UCB and check the connections from the room thermo- and M3. stat to the relay board. If all connections are cor- rect, replace the relay board. If 24 volts is not present at the UCB supply air blower motor terminal, check for 24 volts from the The draft motor runs but the furnace does not light and room thermostat.

  • Page 63: Unit Flash Codes

    175244-BIM-A-0706 cal connection. Check to make sure that the 3. Make sure that the pilot burner is not bent or dam- ceramic insulator on the pilot ignitors or sensors is aged. not broken or cracked, if all are intact, replace the 4.

  • Page 64: Unit Control Board Flash Codes

    175244-BIM-A-0706 of flashes, and is shown in the table. Pressing and In some cases, it may be necessary to "zero" the releasing the LAST ERROR button on the UCB can ASCD for the compressors in order to perform trouble- check the alarm history. The UCB will cycle through the shooting.

  • Page 65: Unit Control Board

    175244-BIM-A-0706 Check Alarm History Reset All ASCDs for One Cycle Non Alarm Condition Green LED Flashing Current Alarm Flashed Red LED FIGURE 27 - UNIT CONTROL BOARD Unitary Products Group...
  • Page 66 175244-BIM-A-0706 Unitary Products Group...
  • Page 67 175244-BIM-A-0706 Unitary Products Group...
  • Page 68 Subject to change without notice. Printed in U.S.A. 175244-BIM-A-0706 Copyright © 2006 by Unitary Products Group. All rights reserved. Supersedes: 128567-BIM-A-0705 Unitary 5005 Norman Products York Group Drive 73069...

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