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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . . . . .53
START-UP (GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . .53
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
SERIES 20
GAS/ELECTRIC SINGLE PACKAGE
AIR CONDITIONERS
MODELS: J15, 18, 20 & 25 DJ
349215-JIM-B-1008
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Table of Contents
Troubleshooting
Related Manuals for York 20 Series
Summary of Contents for York 20 Series
- Page 1 INSTALLATION SERIES 20 MANUAL GAS/ELECTRIC SINGLE PACKAGE AIR CONDITIONERS CONTENTS GENERAL ........4 MODELS: J15, 18, 20 &...
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Page 2: Table Of Contents
349215-JIM-B-1008 TABLE OF CONTENTS GENERAL ........AIR BALANCE . - Page 3 349215-JIM-B-1008 LIST OF TABLES BURNER INSTRUCTIONS ......55 BURNER AIR SHUTTER ADJUSTMENT ....55 Tbl.
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Page 4: General
349215-JIM-B-1008 GENERAL Johnson Controls Series 20 Model J**DJ units are either single package air conditions equipped with FIRE OR EXPLOSION HAZARD optional factory installed electric heaters, or single package gas-fired central heating furnaces with cooling Failure to follow safety warnings exactly could unit. -
Page 5: Renewal Parts
349215-JIM-B-1008 RENEWAL PARTS For authorized replacement parts call Johnson Con- trols, Inc. National Source 1 Parts outlet at 1-866-523- 9670. Incorrect Installation May Create A Condition APPROVALS Where The Operation Of The Product Could Cause Personal Injury Or Property Damage. Design certified by CSA as follows: •... -
Page 6: Product Nomenclature
349215-JIM-B-1008 PRODUCT NOMENCLATURE 15-25 Ton Series 20 Model Number Nomenclature N24 A 2 A AA 1 0 1 2 4 A Nominal Cooling Capacity Product Style J15 = 15 Ton A = Style A J18 = 17.5 Ton J20 = 20 Ton J25 = 25 Ton 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
349215-JIM-B-1008 INSTALLATION In U.S.A.: • National Electrical Code ANSI/NFPA No. 70. INSTALLATION SAFETY INFORMATION: • National Fuel Gas Code Z223.1. Read these instructions before continuing this appli- • Gas-Fired Central Furnace Standard ANSI ance installation. This is an outdoor combination heat- Z21.47a. -
Page 8: Location
349215-JIM-B-1008 TABLE 1: UNIT APPLICATION DATA UNIT MODEL NUMBER J15DJ J18DJ J20DJ J25DJ 208/230-3-60 187/253 Voltage Varation, 460-3-60 414/506 Min./Max.1 575-3-60 518/630 Supply Air CFM, Min./Max. 4,500/7,000 6,000/8,750 6,000/9,400 7,500/12,500 Wet bulb Temperature (°F) of Air on Evaporator Coil, 57/72 Min./Max. -
Page 9: Rigging And Handling
349215-JIM-B-1008 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
349215-JIM-B-1008 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
349215-JIM-B-1008 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: Typical Field Wiring
349215-JIM-B-1008 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
349215-JIM-B-1008 THERMOSTAT fittings to comply with NEC (in U.S.A.), CEC (in Can- ada) and/or local codes. Refer to the Dimensions Figure 13 for installation location. If any of the wire sup- The room thermostat should be located on an inside wall approximately 56 inches above the floor where it plied with the unit must be replaced, replacement wire will not be subject to drafts, sun exposure or heat from... -
Page 14: Optional Gas Heat
349215-JIM-B-1008 TABLE 3: ELECTRIC HEAT APPLICATION DATA NOMINAL VOLTAGE MINIMUM CFM UNIT SIZE HEATER SIZE 3-PHASE, 15 TON 17.5 TON 20 TON 25 TON (KW) 60 HZ 208/230,460,575 4500 208/230,460,575 4500 208/230 5000 6000 6000 7500 460,575 4500 208/230 5000 460,575 4500 OPTIONAL GAS HEAT... -
Page 15: Gas Connection
349215-JIM-B-1008 GAS CONNECTION 4. All piping should be cleaned of dirt and scale by hammering on the outside of the pipe and blowing The gas supply line can be routed through the knock- out the loose dirt and scale. Before initial start-up, outs located on the front of the unit or through the be sure that all of the gas lines external to the unit opening provided in the unit's base. -
Page 16: L.p. Units, Tanks And Piping
349215-JIM-B-1008 3. The pressure drop in the lines between regulators and between the second stage regulator and the appliance. Pipe size required will depend on the length of the pipe run and the total load of all appli- ances. Complete information regarding tank sizing for vapor- ization, recommended regulator settings, and pipe siz- ing is available from most regulator manufacturers and L.P./propane gas suppliers. -
Page 17: Optional Economizer/Motorized Damper Rain Hood
349215-JIM-B-1008 Each vent hood is installed by inserting the top flange of the hood into the slotted opening in the access panel and securing in place. The products of combustion are discharged horizon- Extreme care must be exercised in turning all tally through these two screened, hooded vent open- setpoint, maximum, and minimum damper ings on the upper gas heat access panel. -
Page 18: Optional Bas-Ready Economizer Power Exhaust Damper Set Point Adjustment
349215-JIM-B-1008 When the AQ signal exceeds it's setpoint setting and the tubing from the 'HIGH' pressure tap of the trans- there is no call for free cooling, the actuator is propor- ducer to a static pressure tap (field supplied) in the tionately modulated from the 2 to 10 Vdc signal, with 2 supply duct located at a point where constant pressure Vdc corresponding to full closed and 10 Vdc corre-... -
Page 19: Factory-Installed Vfd
349215-JIM-B-1008 • RH - a 0-10 VDC analog input provided by a field- Either of the set points described above can be NOTE: installed return air relative humidity sensor for dual changed through the unit control board (UCB) enthalpy economizer configuration (used with OH). with the use of a USB-to-RS485 converter, •... -
Page 20: Bas-Ready Vfd
349215-JIM-B-1008 If a drive failure occurs, the unit does not automatically Once the appropriate relay and capacitor are obtained, switch to bypass mode. The LINE/DRIVE/TEST switch install the capacitor across LR terminals '3' & '4' and must be manually switched to the LINE (BYPASS) make the following wiring connections: position. -
Page 21: Optional Hot Gas Bypass (Hgbp)
349215-JIM-B-1008 nal, must be field wired to the building's VAV boxes to order to maintain a desired minimum evaporator pres- ensure fully open dampers during heating operation. sure. OPTIONAL HOT GAS BYPASS (HGBP) The opening pressure of the bypass valve is fully adjustable between 0 and 80 psig with a factory-setting To allow for low cooling load operation, a direct-acting, of 60 psig. -
Page 22: Economizer Control (Excludes Vfd And Bas Options)
349215-JIM-B-1008 Exhaust Air Adjustment Screw Exhaust Air LED 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 - ECONOMIZER CONTROL (EXCLUDES VFD AND BAS OPTIONS) FIGURE 11 - FOUR AND SIX POINT LOADS Johnson Controls Unitary Products... -
Page 23: Center Of Gravity
349215-JIM-B-1008 TABLE 6: FOUR AND SIX POINT LOADS Total 4 Point Loads (lbs) Unit Size Shipping Weight J15DJ Gas 2660 J18DJ Gas 2928 J20DJ Gas 2960 J25DJ Gas 3046 J15DJ Elec 2460 J18DJ Elec 2728 J20DJ Elec 2760 J25DJ Elec 2846 Total 6 Point Loads (lbs) -
Page 24: Physical Data
349215-JIM-B-1008 TABLE 7: PHYSICAL DATA MODELS J15DJ J18DJ J20DJ J25DJ CENTRIFUGAL BLOWER (Dia. x Wd.) 15x15 18x15 18x15 18x15 EVAPORATOR BLOWER FAN MOTOR HP ROWS DEEP EVAPORATOR FINS PER INCH 13.5 COIL FACE AREA (Sq. Ft.) PROPELLER DIA. (In.) (Each) CONDENSER FAN FAN MOTOR HP (Each) -
Page 25: Dj Electrical Data Without Powered Convenience Outlet
349215-JIM-B-1008 TABLE 9: J**DJ ELECTRICAL DATA WITHOUT POWERED CONVENIENCE OUTLET 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) (AMPS) None 74.2... - Page 26 349215-JIM-B-1008 TABLE 9: J**DJ ELECTRICAL DATA WITHOUT POWERED CONVENIENCE OUTLET (CONTINUED) 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 EACH (AMPS) (AMPS) None...
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Page 27: Dj Electrical Data With Powered Conve- Nience Outlet
349215-JIM-B-1008 TABLE 10: J**DJ ELECTRICAL DATA WITH POWERED CONVENIENCE OUTLET 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) (AMPS) None 84.2... - Page 28 349215-JIM-B-1008 TABLE 10: J**DJ ELECTRICAL DATA WITH POWERED CONVENIENCE OUTLET (CONTINUED) 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 EACH (AMPS) (AMPS) None...
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Page 29: Front View Dimensions 15, 17.5, 20 & 25 Ton
349215-JIM-B-1008 ECONOMIZER / MOTORIZED DAMPER FIXED OUTDOOR INTAKE AIR AND POWER EXHAUST RAIN HOODS (See detail Y) BLOWER MOTOR ACCESS (Location BLOWER ACCESS BLOWER of Optional VFD Bypass) (Location of COMPARTMENT Optional VFD) ACCESS COMPRESSOR ACCESS 180-19/32 (Auxiliary) DOT PLUG 52-5/8 (For pressure drop reading) -
Page 30: Rear View Dimensions
349215-JIM-B-1008 EVAPORATOR SECTION DOT PLUG (For pressure 40-3/8" drop reading) FILTER ACCESS SUPPLY RETURN COMPRESSOR OUTDOOR ACCESS 40-1/2" SUPPLY AIR 18-5/8" ACCESS 1" NPT FEMALE Dimensions listed are for side 27-3/4" COND. DRAIN CONNECTION 5-1/8" RETURN AIR duct flange openings; see ACCESS OUTDOOR AIR Field Accessories for Side... -
Page 31: Unit Clearances And Rain Hood Dimensions
349215-JIM-B-1008 NOTE: ELEC / ELEC Models: Units and ductwork are CLEARANCES approved for zero clearance to combustible material CLEARANCE LOCATION when equipped with electric heaters. 36” Front 24” (Less Economizer) Rear GAS / ELEC Models: A 1” clearance must be 49”... -
Page 32: Cfm, Static Pressure, And Power - Altitude And Temperature Corrections
349215-JIM-B-1008 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 33: Factor
349215-JIM-B-1008 ltitude/Temperature Conversion Factor SEA LEVEL TEMPER TURE (°F) FIGURE 16 - ALTITUDE/TEMPERATURE CONVERSION FACTOR Johnson Controls Unitary Products... -
Page 34: Supply Air Blower Performance (15 Ton) - Cooling Only 180 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 12: SUPPLY AIR BLOWER PERFORMANCE (15 TON) - COOLING ONLY 180 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 4500 5250 6000 6750 7200 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 6.0** 4.8. 1010 1040 208 VOLT AND HIGH STATIC DRIVE 1025 1065 1095... -
Page 35: Supply Air Blower Performance (17.5 Ton) - Cooling Only 210 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 13: SUPPLY AIR BLOWER PERFORMANCE (17.5 TON) - COOLING ONLY 210 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 6000 7000 8000 9000 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 6.0** 1015 208 VOLT AND HIGH STATIC DRIVE 1010 1020 1035... -
Page 36: Supply Air Blower Performance (20 Ton) - Cooling Only 240 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 14: SUPPLY AIR BLOWER PERFORMANCE (20 TON) - COOLING ONLY 240 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 6000 7000 8000 9000 9400 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 6.0** 1015 208 VOLT AND HIGH STATIC DRIVE 1010 1020 1035... -
Page 37: Supply Air Blower Performance (15 Ton) - Gas Heat180 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 15: SUPPLY AIR BLOWER PERFORMANCE (15 TON) - GAS HEAT 180 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 4500 5250 6000 6750 7200 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 6.0** 1010 1040 208 VOLT AND HIGH STATIC DRIVE 1025 1065 1125... -
Page 38: Supply Air Blower Performance (17.5 Ton) - Gas Heat 210 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 16: SUPPLY AIR BLOWER PERFORMANCE (17.5 TON) - GAS HEAT 210 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 6000 7000 8000 9000 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 6.0** 1015 208 VOLT AND HIGH STATIC DRIVE 1025 1050 1065... -
Page 39: Supply Air Blower Performance (20 Ton) - Gas Heat 240 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 17: SUPPLY AIR BLOWER PERFORMANCE (20 TON) - GAS HEAT 240 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 6000 7000 8000 9000 9400 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 6.0** 1015 208 VOLT AND HIGH STATIC DRIVE 1025 1050 1065... -
Page 40: Supply Air Blower Performance (25 Ton) - Gas Heat 300 Mbh - Bottom Duct Connections
349215-JIM-B-1008 TABLE 18: SUPPLY AIR BLOWER PERFORMANCE (25 TON) - GAS HEAT 300 MBH - BOTTOM DUCT CONNECTIONS MOTOR BLOWER PULLEY 7500 8750 10000 11250 12500 SPEED, (TURNS (RPM) OPEN)* 208 VOLT AND STANDARD DRIVE 1005 1040 1070 10.2 1100 10.6 1135 11.1... -
Page 41: Static Resistances
349215-JIM-B-1008 TABLE 19: STATIC RESISTANCES RESISTANCE, IWG DESCRIPTION 15 TON 17.5 TON 20 TON 25 TON 4500 6000 7200 6000 7500 9000 6000 8000 9400 7500 10000 12500 WET INDOOR COIL 18 KW 36 KW ELECTRIC HEAT OPTIONS 54 KW 72 KW ECONOMIZER OPTION HORIZONTAL DUCT CONNECTIONS... -
Page 42: Charging Chart - 15 Ton
349215-JIM-B-1008 15 Ton Charging Chart Outdoor Temp (°F) º 105º 95º 85º 75º Suction Pressure (psi) 1. Make sure that both condenser fans are running w hen charging. One fan may sw itch off at low er ambient temperatures making the chart above inaccurate. 2. -
Page 43: Charging Chart - 20 Ton
349215-JIM-B-1008 20 Ton Charging Chart Outdoor Temp (°F) 115° 105° 95° 85° 75° 65° Suc tion 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 44: Phasing
349215-JIM-B-1008 PHASING Note the following: Johnson Controls MODEL J**DJ, units are properly 1. The supply air CFM must be within the limitations phased at the factory. Check for proper compressor shown in the Unit Application Data Table 1. rotation. If the blower or compressors rotate in the wrong direction at start-up, the electrical connection to 2. -
Page 45: Operation
349215-JIM-B-1008 Start the supply air blower motor. Adjust the resis- tances in both the supply and the return air duct sys- tems to balance the air distribution throughout the conditioned space. The job specifications may require Failure to properly adjust the total system air that this balancing be done by someone other than the quantity can result in extensive blower damage. -
Page 46: Optional Vav Blower Operation
349215-JIM-B-1008 gized after any specified delay associated with the compressor de-energizing, the blower is stopped fol- operation. lowing the elapse of the fan off delay for cooling. When energized, the indoor blower has a minimum run To be available, a compressor must not be locked-out time of 30 seconds. -
Page 47: Economizer (Single Or Dual Enthalpy) With Power Exhaust
349215-JIM-B-1008 ECONOMIZER (SINGLE OR DUAL ENTHALPY) WITH If at anytime the outdoor air temperature rises above POWER EXHAUST the First-Stage SAT Control setpoint plus 5 °F, while free-cooling is available, then a Y1 call will also initiate This system operates as specified above with one 1st-stage mechanical cooling. -
Page 48: High-Pressure Limit Switch
349215-JIM-B-1008 HIGH-PRESSURE LIMIT SWITCH sor and flash a code (Table 27). If the other compressor is inactive, the condenser fans will be de-energized. During cooling operation, if a high-pressure limit switch LOW AMBIENT COOLING opens, the UCB will de-energize the associated com- pressor, initiate the ASCD (Anti-short cycle delay), and, To determine when to operate in low ambient mode, if the other compressor is idle, stop the condenser... -
Page 49: Compressor Protection
349215-JIM-B-1008 COMPRESSOR PROTECTION Two-stage heating: (applies to all heaters except 18 KW): The compressors also have inherent (internal) protec- tion. If there is an abnormal temperature rise in a com- Upon a call for first-stage heat by the thermostat, the pressor, the protector will open to shut down the heater contactor (6M) (6M &... -
Page 50: Flash Codes
349215-JIM-B-1008 supply air flow occurs, thus shutting down the TABLE 23: ELECTRIC HEAT ANTICIPATOR heater and energizing the blower. SETPOINTS SETTING, AMPS HEATER 2. Temperature Limit Switch (TLS 3, 4, 5 and 6). VOLTAGE 0.29 This control is located inside the heater compart- 0.29 0.29 ment and is set to open at the temperature indi-... -
Page 51: Gas Heating Operation Errors
349215-JIM-B-1008 Gas flows into each of the main burners and is ignited When the thermostat calls for the first stage of heating, from the carryover tube flame. the low-voltage control circuit from "R" to "W1" is com- pleted. A call for heat passes through the UCB to the After completing the specified fan on delay for heating, ignition control board (ICB). -
Page 52: Safety Controls
349215-JIM-B-1008 SAFETY CONTROLS out both ignition controls closing both gas valves. The ignition controls lock out furnace operation The unit control board monitors the temperature limit until 24V power is removed from the controls either switch and the gas valve of gas furnace units. at the unit or by resetting the room thermostat. -
Page 53: Heat Anticipator Setpoints
349215-JIM-B-1008 HEAT ANTICIPATOR SETPOINTS OPERATING INSTRUCTIONS 1. Turn unit electrical power on. It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles 2. Set the room thermostat setting to lower than the and a greater temperature swing in the conditioned room temperature. -
Page 54: Operating Instructions
349215-JIM-B-1008 OPERATING INSTRUCTIONS FIRE OR EXPLOSION HAZARD This furnace is equipped with an intermittent Failure to follow the safety warning exactly pilot and automatic re-ignition system. DO could result In serious injury, death or property NOT attempt to manually light the pilot. damage. -
Page 55: Manifold Gas Pressure Adjustment
349215-JIM-B-1008 MANIFOLD GAS PRESSURE ADJUSTMENT 1. Remove the screws holding either end of the mani- fold to the burner supports. Small adjustments to the high-fire gas flow may be 2. Open the union fitting in the gas supply line just made by turning the pressure regulator adjusting screw upstream of the unit gas valve and downstream on the automatic gas valve. -
Page 56: Adjustment Of Temperature Rise
349215-JIM-B-1008 TROUBLESHOOTING To find the Btu input, multiply the number of NOTE: cubic feet of gas consumed per hour by the Btu content of the gas in your particular locality COOLING TROUBLESHOOTING GUIDE (contact your gas company for this information - it varies widely from city to city.) TABLE 26: GAS RATE - CUBIC FEET PER HOUR Seconds... - Page 57 349215-JIM-B-1008 voltage is being supplied to the contacts of the M3, terminal is connected to the G terminal of the UCB, contactor, and that the contactor is pulled in. For and for loose wiring. units with VFD, check that line voltage is being supplied to the M3-Auxiliary contacts.
- Page 58 349215-JIM-B-1008 between the room thermostat and the UCB, i.e. Y1 13. For units with economizers: If 24 volts is present at to Y1, Y2 to Y2, and c) loose wiring from the room the Y1 “OUT” terminal, check for 24 volts at the Y1 thermostat to the UCB.
- Page 59 349215-JIM-B-1008 free cooling if the call for the second stage of cool- not, press and release the ALARMS button on the ing persists for 20 minutes. UCB. The UCB will flash the last five alarms on the LED. If the compressor is locked out, remove any 2.
- Page 60 349215-JIM-B-1008 the ALARMS button if the LED is not flashing an call for cooling. This will reset any compressor lock alarm. outs. 2. Check for line voltage at the compressor contactor, While the above step will reset any lock outs, NOTE: M1, and that the contactor is pulled in.
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Page 61: Gas Heat Troubleshooting Guide
349215-JIM-B-1008 default. They can be checked by local distributors. For units with factory installed economizers, the UCB is programmed to lock out compressor opera- Label all wires prior to disconnection when ser- tion when the LAS set point is reached. vicing controls. - Page 62 349215-JIM-B-1008 4. If M3 is not pulled in, check for 24 volts at the M3 1. The draft motor has inherent protection. If the coil. If 24 volts is present at M3 but M3 is not pulled motor shell is hot to the touch, wait for the internal in, replace the contactor.
- Page 63 349215-JIM-B-1008 the (TDR) is open and must be replaced. If there is 2. Check the supply pressure as described in “POST continuity, re-attach the wires.With the draft motor START CHECK LIST” page 54. Make adjustments as necessary. running, check for 24 volts at terminal 4 of (RW1-2) and (RW2-1).
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Page 64: Unit Control Board Flash Codes
349215-JIM-B-1008 UNIT CONTROL BOARD FLASH CODES of flashes, and is shown in the table. Pressing and releasing the LAST ERROR button on the UCB can Various flash codes are utilized by the unit control check the alarm history. The UCB will cycle through the board (UCB) to aid in troubleshooting. -
Page 65: Unit Control Board Option Setup
349215-JIM-B-1008 Check Alarm History Reset All ASCDs for One Cycle Non Alarm Condition Green LED Flashing Current Alarm Flashed Red LED FIGURE 28 - UNIT CONTROL BOARD UNIT CONTROL BOARD OPTION SETUP mode. When saving, the control board only saves the parameters for the currently dis- played mode (Option Byte or Heat Delay). -
Page 66: Optional Vav Control Board Flash Codes
349215-JIM-B-1008 While in either Setup mode, if no buttons are OPTIONAL VAV CONTROL BOARD FLASH CODES NOTE: pushed for 60 seconds, the display will revert Flash codes are also utilized by the VAV add-on board to aid to its normal display, exiting the Option Setup in troubleshooting optional VAV applications. - Page 67 349215-JIM-B-1008 Johnson Controls Unitary Products...
- Page 68 Subject to change without notice. Printed in U.S.A. 349215-JIM-B-1008 Copyright © 2008 by Johnson Controls, Inc. All rights reserved. Supersedes: 349215-JIM-A-1007 Johnson Controls Unitary Products 5005 York Drive Norman, OK 73069...