Page 2 - Hazard Identification; Sample Warnings and Cautions; WARNING; Common HVAC Acronyms; Introduction
© 2008 Trane All rights reserved SCXG-SVX01B-EN About This ManualLiterature Change History Use this manual for commercial self-contained models SCWG, SIWG, SCRG,and SIRG. This is the second or “B”revision of this manual. It providesspecific installation, operation, andmaintenance, instructions for “...
Page 3 - Cross reference to related publications/information:; programming .......................................................57; Operation .............................................70; Contents
SCXG-SVX01B-EN 3 Cross reference to related publications/information: • Product Catalog, PKG-PRC003-EN, Modular Series Commercial Self-Contained• IntelliPak • Self-Contained Programming Guide, PKG-SVP01B-EN • Remote Air-Cool-Condenser Installation, Owner, and Diagnostic Manual, CXRC-SVX01B-EN Instal...
Page 6 - Installation; Control Options; IntelliPak; controls include a Human; Human Interface Panel; ships with each unit.; IntelliPak; DDC Control; IntelliPak; DDC Control provides “smart”; Optional Controls; Unit Nameplate
6 SCXG-SVX01B-EN Installation Control Options Units may be ordered with eitherconventional thermostat interface orIntelliPak TM Direct Digital Control (DDC). IntelliPak TM controls include a Human Interface (HI) panel with two line by forty(40) character clear English display foreasy operator interf...
Page 7 - Model Number Description; SCWG
SCXG-SVX01B-EN 7 ModelNumberDescription Model Number Description Each IntelliPak self-contained unit has a multiple character model number unique to that unit. To determine a unit’s specific options,reference the model number on the unit nameplate using the model number explanation below. SCWG S C W...
Page 9 - JO; Self-Contained Ship-With Accessory Model Number Description; Digit 4 - Development Sequence; PSWG; Digit 9 - Future Option
SCXG-SVX01B-EN 9 P S W G S A 1 1 0 JO 1 2 3 4 5 6 7 8 9 10 11 Self-Contained Ship-With Accessory Model Number Description Digit 1 - Parts/Accessories P = Parts/Accessories Digit 2 - Unit Model S= Self-Contained Digit 3 - Shipment W = With Unit Digit 4 - Development Sequence F = Signature SeriesG = M...
Page 10 - “After-Shipment” Accessory Model Number
1 0 SCXG-SVX01B-EN ModelNumberDescription PSWG “After-Shipment” Accessory Model Number P S A G W N 20 4 ** 1 10 0 0 0 1 0 1 0 1 0 1 0 0 1 1 0 0 0 0 0 L 1 0 0 7 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Digit 1 - Parts/Accessori...
Page 11 - Receiving and Handling; Shipping Package
SCXG-SVX01B-EN 1 1 Installation Receiving and Handling Shipping Package Commercial self-contained units shipassembled with protective coveringsover the coil and discharge openings.Figure I-PC-1 illustrates a typical shippingpackage. Ship-Separate Accessories Field-installed sensors ship separatelyin...
Page 12 - Installation Preparation; Verify the floor or foundation is level.
1 2 SCXG-SVX01B-EN pre-installationconsiderations Installation Installation Preparation Before installing the unit, performthe following procedures toensure proper unit operation. 1. Verify the floor or foundation is level. Shim or repair as necessary. To ensureproper unit operation, install the uni...
Page 13 - Service Access
SCXG-SVX01B-EN 1 3 Service Access WARNING Hazardous Voltage w/Capacitors! Disconnect all electric power, includingremote disconnects before servicing.Follow proper lockout/tagout proce-dures to ensure the power cannot beinadvertently energized. For variablefrequency drives or other energy ...
Page 14 - Rigging and Unit Handling
1 4 SCXG-SVX01B-EN pre-installationconsiderations Installation Rigging and Unit Handling WARNING Improper Unit Lift! Test lift unit approximately 24 inches toverify proper center of gravity lift point.To avoid dropping of unit, repositionlifting point if unit is not level. Failure toproper...
Page 15 - Unit Handling Procedure; NOTICE
SCXG-SVX01B-EN 1 5 pre-installationconsiderations Installation Figure I-PC-8. Split-apart modular unit proper rigging. Figure I-PC-7. Assembled modular unit proper rigging. Unit Handling Procedure NOTICE Do not use hooks to lift unit or hook intoopen channels to lift unit. This couldcause unit damag...
Page 16 - Split-Apart Unit Assembly; Units with Thermostat Only
1 6 SCXG-SVX01B-EN Installation pre-installationconsiderations Split-Apart Unit Assembly 1. Ensure the tagging information on the fan section nameplate matches that onthe compressor nameplate. 2. Remove the connector brackets holding the the sheet metal shippingcover on compressor section. Retainbra...
Page 17 - Figure I-PC-9 How to assemble the split apart modular unit
SCXG-SVX01B-EN 1 7 Installation pre-installationconsiderations Figure I-PC-9 How to assemble the split apart modular unit Figure I-PC-10 Modular unit panel description and internal connections
Page 18 - Skid Removal
1 8 SCXG-SVX01B-EN pre-installationconsiderations Installation Skid Removal The unit ships on skids to provide forkliftlocations from the front or rear. The skidallows easy maneuverability of the unitduring storage and transportation.Remove the skids before placing the unitin its permanent location....
Page 20 - back view
2 0 SCXG-SVX01B-EN SCRG /SIRG Dimensions &Weights SCRG/SIRG Dimensions, in. SCRG/SIRG Weight, lbs. unit tons base weight 2 0 2344 2 5 2479 3 2 2614 Notes:1. All unit weights include refrigerant, water, inlet guide vanes and controllers, electric heat and valves. 2. Add 150 lbs. to total weight t...
Page 21 - front view
SCXG-SVX01B-EN 2 1 Dimensions &Weights Detail Dimensions, in. model A B C D E F SCWG/SCRG 20 2 0 10 3 / 4 58 1 / 2 5 1 / 8 13 1 / 4 11 1 / 2 SCWG/SCRG 25 19 1 / 4 12 1 / 4 57 5 / 8 5 1 / 8 13 1 / 4 11 1 / 2 SCWG 30 - 35/SCRG 32 1 8 14 5 / 8 56 1 / 2 5 1 / 8 13 1 / 4 11 1 / 2 front view shown wit...
Page 23 - Hot Water Coil
SCXG-SVX01B-EN 2 3 Hot water coil dimensions & weight, in-lbs. unit size A B C D E F G H J weight 20 - 35 tons 37 1 / 4 53 3 / 4 16 5 / 8 73 1 / 2 14 7 / 8 16 1 / 4 43 1 / 4 5 5 / 8 7 3 / 4 460 Dimensions &Weights Hot Water Coil
Page 24 - Steam Coil
2 4 SCXG-SVX01B-EN Steam Coil Dimensions &Weights Steam coil dimensions, in-lbs. unit size A B C D E K L M N P Q R weight 20 - 35 tons 37 1 / 4 53 3 / 4 16 5 / 8 73 1 / 2 10 7 / 8 22 1 / 2 3 3 / 8 15 7 / 8 1 4 1 9 3 / 8 4 3 / 8 460
Page 25 - Electric Heat Coil
SCXG-SVX01B-EN 2 5 Electric Heat Coil Electric heat coil dimensions & weight, in-lbs. unit size A B C D weight 20 tons 70 1 / 4 4 7 / 8 11 1 / 2 19 460 25 tons 70 1 / 4 4 1 / 8 11 1 / 2 19 460 30 - 35 tons 70 1 / 4 2 7 / 8 11 1 / 2 19 460 Note: Coil box height is 8 in. Flexible horizontal discha...
Page 26 - Waterside Economizer
2 6 SCXG-SVX01B-EN Waterside Economizer Waterside economizer weight, in-lbs. weight unit size 2-row 4-row 20 - 35 tons 488 584 Dimensions &Weights
Page 27 - Airside Economizer; Detail “A”
SCXG-SVX01B-EN 2 7 AirsideEconomizer Dimensions &Weights Airside economizer dimensions & weight, in-lbs. unit size A B C D E F (1) F (2) G (1) G (2) H (1) H (2) J K L M weight SCWG/SIWG 20, 25 3 6 65 5 / 8 3 7 74 1 / 4 6 1 / 8 56 1 / 2 49 3 / 4 23 1 / 4 20 1 / 2 5 5 / 8 7 20 1 / 2 17 1 / 8 1...
Page 28 - VFD; result in death or serious injury.; There; must; be a; minimum; eight inch; Mounting Requirements
2 8 SCXG-SVX01B-EN VFD A B C D E F G VFD dimensions, in. voltage hp A B C D E F G 460 7.5 15.55 15.12 7.87 8.66 0.39 0.24 7.87 10 208 7.5 22.05 21.26 7.87 9.53 0.83 0.30 10.24 10 460 1 52 02 5 208 1 5 27.56 26.77 10.63 12.13 0.83 0.30 11.05 2 0 460 3 04 0 208 3 0 31.50 30.71 10.63 12.13 0.75 0.30 11...
Page 29 - Variable Frequency Drive with Bypass; Electrical Installation Procedure; Refer to the; be connected at the VFD
SCXG-SVX01B-EN 2 9 VFD Dimensions &Weights Variable Frequency Drive with Bypass VFD with bypass dimensions, in. voltage hp A B C D E F G H 460 7.5 30.40 28.03 16.14 23.35 24.85 0.75 8.59 10.63 10 208 7.5 41.28 38.89 16.14 24.00 25.5 0.75 10.95 12.99 101520 460 152025 208 25 50.81 48.35 21.36 31....
Page 30 - Water Piping; Condenser Connections; Attach the water supply line to the inlet; Duct Connections; for; three inches; for the
3 0 SCXG-SVX01B-EN Water Piping WARNING High Pressure Water! Provide relief valves on system waterpiping to prevent instantaneous releaseof high pressure water. Failure to providerelief valves could result in death orserious injury or water pump damage orunit failure. Condenser Connections...
Page 31 - Condensate Drain Connections; “ NPT; Waterside Piping Arrangements
SCXG-SVX01B-EN 3 1 MechanicalSpecifications Condensate Drain Connections The condensate drain is internallytrapped. Condensate drain connectionsare on the unit’s left side. Connectcondensate drain piping to the 1 1 / 4 “ NPT female fitting, using at least 7 / 8 ” OD copper or 3 / 4 “ OD iron pipe. P...
Page 32 - Brazing Procedures
3 2 SCXG-SVX01B-EN Refrigerant Piping (Air-CooledUnits Only) See the “Startup” section of this manualfor instructions on refrigerant evacuation,charging, and superheat measurement.Leak-test the entire refrigeration systemafter all piping is complete. Leak Test (Remote Air-cooled Units Only) Units sh...
Page 33 - Supply Power Wiring; Voltage Range; Control Power; Unit Wiring Diagrams
SCXG-SVX01B-EN 3 3 Specific unit wiring diagrams areprovided on the inside of the controlpanel door. Use these diagrams forconnections or trouble analysis. Supply Power Wiring WARNING Hazardous Voltage w/Capacitors! Disconnect all electric power, includingremote disconnects before servicin...
Page 34 - Selection Procedures; Voltage utilization range is ±10%
3 4 SCXG-SVX01B-EN Selection Procedures RLA = rated load ampsCompressor LRA = locked rotor ampsFan motor LRA = locked rotor amps,N.E.C. table 430 - 150FLA = full load amps, N.E.C. Table 430 - 150 Voltage utilization range is ±10% Determination of minimum circuitampacity (MCA).MCA = 1.25 x largest mo...
Page 35 - Pre-Startup Procedures; Unit Protective Covers; ” against the roof transi-
SCXG-SVX01B-EN 3 5 pre-startuprequirements Installation Pre-Startup Procedures WARNING Hazardous Voltage w/Capacitors! Disconnect all electric power, includingremote disconnects before servicing.Follow proper lockout/tagout proce-dures to ensure the power cannot beinadvertently energized. ...
Page 36 - Plenum
3 6 SCXG-SVX01B-EN pre-startuprequirements Plenum Before installing the plenum attach theinsulation strip that ships with the plenum.See Figure I-PR-3 for proper insulationlocation. Align the plenum front with thecontrol panel side of the unit. Using thestrips and screws provided, secure theplenum t...
Page 42 - Hydronic Coil Installation; Installation Procedure
4 2 SCXG-SVX01B-EN pre-startuprequirements Installation Hydronic Coil Installation These instructions are for steam and hotwater coil installation. The hydronic coilassembly has a full coil, piping, a modu-lating temperature control valve, and adisc temperature limit device located inthe unit near t...
Page 43 - Electric Heat Installation; Electric Heat Coil Wiring Procedure
SCXG-SVX01B-EN 4 3 pre-startuprequirements Installation Electric Heat Installation The electric heat option consists of asingle stage heater and is used inIntelliPak units or units with a field-installed thermostat. The electric heaterships separate for field installation andwiring. Available heater...
Page 44 - Zone Sensor Options for IntelliPak Control Units; BAYSENS077* Description; CV Unit Zone Sensor Options; BAYSENS110-Specific Feature: Function status indicator lights:
4 4 SCXG-SVX01B-EN Figure I-PR-10. BAYSENS110Dual setpoint, manual/automatic changeoversensor with system function lights, acces-sory model number digit 6 = F pre-startuprequirements Figure I-PR-7. BAYSENS077zone temperature sensor only Standard with All IntelliPakUnits Zone Sensor Options for Intel...
Page 45 - BAYSENS074 Description; BAYSENS073 Description; “unoccupied” to “occupied” mode.; BAYSENS021 Description; VAV Unit Zone Sensor Option
SCXG-SVX01B-EN 4 5 pre-startuprequirements Figure I-PR-12. BAYSENS073Zone temperature sensor w/timed override ,accessory model number digit 6 = B Figure I-PR-11. BAYSENS074Zone temperature sensor w/timed overrideand local setpoint adjustment,accessory model number digit 6 = C Integrated Comfort ™ Sy...
Page 46 - Wiring; Zone Sensor Installation; Mounting Location
4 6 SCXG-SVX01B-EN literature for allowable waiting periodsfor discharge of capacitors. Verify with anappropriate voltmeter that all capacitorshave discharged. Failure to disconnectpower and discharge capacitors beforeservicing could result in death or seriousinjury. Note: For additional information...
Page 49 - Programmable Zone Sensors
SCXG-SVX01B-EN 4 9 pre-startuprequirements Constant Volume Zone Sensor BAYSENS019 Description This seven day programmable sensorwith night setback has four periods foroccupied\unoccupied programming perday. If power is interrupted, the programretains in permanent memory. If power isoff longer than t...
Page 51 - Time Clock Option; Time Clock Installation
SCXG-SVX01B-EN 5 1 pre-startuprequirements Time Clock Option The time clock option has aprogrammable timer that is factory wiredto the unoccupied input to provide on/offcontrol. The time clock will not allow theunit to pass through the night setback/morning warmup mode, except on unitswith optional ...
Page 52 - condensing
5 2 SCXG-SVX01B-EN pre-startuprequirements Figure I-PR-23. Human interface (HI) panel keypad Remote Human Interface PanelInstallation Human Interface (HI) Panel The HI enables the user to communicatenecessary unit operating parameters andreceive operating status informationfrom within the occupied s...
Page 55 - Do not
SCXG-SVX01B-EN 5 5 Wiring the Remote HumanInterface The remote human interface requires 24VAC + 4 volts power source and ashielded twisted pair communication linkbetween the remote panel and theinterprocessor communication bridge(ICPB) module at the self-contained unit. Field wiring for both the low...
Page 56 - Connecting to Tracer Summit; Pre-Startup Checklist
5 6 SCXG-SVX01B-EN pre-startuprequirements Installation Connecting to Tracer Summit WARNING Hazardous Voltage w/Capaci-tors! Disconnect all electric power, includingremote disconnects before servicing.Follow proper lockout/tagout proce-dures to ensure the power cannot beinadvertently energ...
Page 57 - Up and Down Buttons
SCXG-SVX01B-EN 5 7 programming Installation Figure I-P-1. BAYSENS019 keypad and display configuration BAYSENS019 Keypad and DisplayExplanation 1. Up and Down Buttons • Increases or decreased programmed temperature settings in program menu. • Shifts to temporary manual override in normal run mode. •I...
Page 59 - programming; Time and Day Settings; Keypad Operation
SCXG-SVX01B-EN 5 9 Program Button Depressing the program button willtoggle the display from normal run modeto the program menu. See Figure I-P-3.Before toggling to the program menu,use the mode button to select the typesetpoints to review or program (heat,cool or auto). For example, if you selectcoo...
Page 61 - Temporary Override Run Mode; Temporary Manual Override Run Mode
SCXG-SVX01B-EN 6 1 Temporary Override Run Mode The temporary override run mode sendssetpoint data to the unit control module(UCM) from the setpoint data entered inthe temporary manual override menu. In temporary override run mode, most ofthe keypad functions lock out with theseexceptions:• The mode ...
Page 62 - Option Menu and Keypad Operation; or
6 2 SCXG-SVX01B-EN Table I-P-1. Zone sensor BAYSENS019 option menu settings option description value factory setting 1 morning warmup 0 = disabled 0 1 = enabled 2 economizer minimum 0 = disabled 1 position override 1 = enabled 3 temperature scale 0 = Fahrenheit 0 1 = enabled 4 supply air tempering 0...
Page 63 - Intelligent Copy; To use Intelligent Copy:
SCXG-SVX01B-EN 6 3 programming Installation Table I-P-2. Zone sensor BAYSENS020 option menu settings option description value factorysetting 1 morning warmup 0 = disabled 0 1 = enabled 2 economizer minimum 0 = disabled 1 position override 1 = enabled 3 temperature scale 0 = Fahrenheit 0 1 = enabled ...
Page 64 - Icon Descriptions; BAYSENS019 Icon Descriptions
6 4 SCXG-SVX01B-EN programming Installation Icon Descriptions BAYSENS019 Icon Descriptions Refer to Figure I-P-9 for the writtendescriptions below.1. The four periods of the day used only during programming mode. 2. The seven days of the week used during programming and in normalmode to display the ...
Page 65 - BAYSEN020 Icon Descriptions
SCXG-SVX01B-EN 6 5 programming Installation Figure I-P-10 . BAYSENS020 complete icon display BAYSEN020 Icon Descriptions Refer to Figure I-P-10 for the writtendescriptions below.1. The four periods of the day used only during programming mode. 2. The seven days of the week used during programming an...
Page 67 - Unit Startup Procedures; startup; Operating & Programming Instructions; IntelliPak Self-Contained
SCXG-SVX01B-EN 6 7 Unit Startup Procedures WARNING Hazardous Voltage w/Capaci-tors! Disconnect all electric power, includingremote disconnects before servicing.Follow proper lockout/tagout proce-dures to ensure the power cannot beinadvertently energized. For variablefrequency drives or oth...
Page 68 - Startup Log; Complete this log at unit startup.
6 8 SCXG-SVX01B-EN Installation Startup Log Complete this log at unit startup. Unit: ____________________________ Unit Location: _________________________________________ Unit Voltage: __________ __________ __________ A B C Evaporator: evaporator fan motor horsepower: __________ evaporator fan motor...
Page 69 - (data taken from outside condensing unit)
SCXG-SVX01B-EN 6 9 Installation startup ___________________________________________________________________________________________________________________________ Water Cooled Units: Circuit A:entering water temperature °F: __________ leaving water temperature °F: __________ entering water pressure...
Page 70 - Operation; Points List
7 0 SCXG-SVX01B-EN Operation generalinformation Binary outputs • V.O. relay Points List - Tracer TM LCI-I Module Constant Volume (CV) Points Binary inputs • Airside economizer enable/disable• Condensor type (air or water cooled)• Condensor water flow status• Emergency shutdown• Local fan switch enab...
Page 71 - Unit Control Components; if a valid resistance per
SCXG-SVX01B-EN 7 1 Unit Control Components The Modular Series IntelliPak self- contained unit is controlled by amicroelectronic control system thatconsists of a network of modules. Thesemodules are referred to as unit controlmodules (UCM). In this manual, theacronym UCM refers to the entire controls...
Page 72 - Occupied/Unoccupied Contacts; with night setback; Emergency Stop Input
7 2 SCXG-SVX01B-EN Table O-GI-2. RTM sensor resistance vs. temperature temperature, °F resistance, Ω ohms temperature, °F resistance, Ω ohms -40 346.1 7 1 11.60 -30 241.7 7 2 11.31 -20 170.1 7 3 11.03 -10 121.4 74 10.76 - 5 103.0 7 5 10.50 0 87.56 7 6 10.25 5 74.65 7 7 10.00 10 63.8 7 8 9.76 1 5 54....
Page 73 - Cooling Tower Interlock; Heat Module; UNIT OFF sequence “A”
SCXG-SVX01B-EN 7 3 Compressor Module (MCM -Standard on all Units The compressor module, (single circuitand multiple circuit) energizes theappropriate compressors and condenserfans upon receiving a request formechanical cooling. It monitors thecompressor operation through feedbackinformation it recei...
Page 74 - or 3rd party
7 4 SCXG-SVX01B-EN Figure O-GI-2. Velocity pressure transducer/solenoid assembly PURGE sequence “D” This sequence can purge the air out of abuilding before coming out of unoccupiedmode of operation in a VAV system. Also,it can be used to purge smoke or stale air.• Supply fan – on• Supply fan VFD – o...
Page 77 - Waterside Components; the unit can be configured to provide:
SCXG-SVX01B-EN 7 7 Waterside Components Waterside components consist of waterpiping, water valves, water flow switchoption, water cooled condensers (SXWFonly), and the economizer option. Water Purge This user-definable feature allows theuser to select a purge schedule toautomatically circulate water...
Page 79 - Unit Airside Components
SCXG-SVX01B-EN 7 9 Unit Airside Components The unit’s air delivery system consists ofdampers, enthalpy switch option, airsideeconomizer option, filters, low ambientsensors, and factory mounted single ordouble wall plenums. Supply Air Fan The unit has a single supply fan that runsat a constant speed....
Page 80 - Damper; Standard Two-Position Damper Interface
8 0 SCXG-SVX01B-EN stage of cooling, in occupied orunoccupied mode and when ambientconditions are favorable for economizing.Inherent in the unit controller is the abilityto suppress the setpoint below thenormal unit setpoint. This allows thebuilding to improve comfort levels whenpossible, and at the...
Page 81 - Air-Cooled Condensers
SCXG-SVX01B-EN 8 1 peak operating efficiency. An outside airtemperature and relative humiditysensor are provided for field installationto monitor reference enthalpy.Economizer operation enables when theoutside air enthalpy is less than 25 BTu/lb(adjustable 19-28 BTu/lb.). Duringoccupied mode, the ou...
Page 82 - During a request for
8 2 SCXG-SVX01B-EN Input Devices and SystemFunctions Following are basic input device andsystem function descriptions used withinthe UCM network on IntelliPak self-contained units. Refer to the unit wiringdiagrams for specific connections. Water Purge NOTICEProper Water Treatment! The use of untreat...
Page 84 - • After the supply fan shuts down, the
8 4 SCXG-SVX01B-EN Control Sequences ofOperation Occupied/Unoccupied Switching There are four ways to switch occupied/unoccupied:(1) Night setback zone sensor(2) Field-supplied contact closure (hardwired binary input to RTM) (3) Tracer Summit(4) Factory-mounted time clock Field Supplied Occupied/Uno...
Page 86 - Occupied Sequence; Occupied Zone Temperature - Cooling; • Purge will be enabled by Tracer Summit.; Cooling
8 6 SCXG-SVX01B-EN sequence ofoperation Occupied Sequence All setpoints can be adjusted using the HIpanel. Also, cooling/heating setpoints canbe adjusted in the zone, if using one of thezone sensor options (BAYSENS020,BAYSENS021, BAYSENS108,BAYSENS110, BAYSENS019, orBAYSENS074). For a complete list ...
Page 88 - Compressors; Compressor Cycling
8 8 SCXG-SVX01B-EN Compressors Units use two sizes of hermetic scrollcompressors, 10 and 15 hp, and can usefrom two to six compressors. Whenviewing the front of the unit, compressorsare identified A through B from left toright. The second compressor from theleft, or B compressor, is always the first...
Page 89 - Low Ambient Compressor Lockout; The FROSTAT; Compressor Safety Devices; Cooling stage unit: 9°F
SCXG-SVX01B-EN 8 9 Low Ambient Compressor Lockout This function will lock out the compressorif the outdoor air temperature sensorreads an outdoor temperature below thelow ambient compressor lockouttemperature setpoint. This setpoint isadjustable at the human interface panel.Compressors will lock out...
Page 90 - Service Valve Option
9 0 SCXG-SVX01B-EN sequence ofoperation Figure O-SO-2. Typical pulldown curve for unit operating properly within control band Figure O-SO-3. Typical pulldown curve for unit operating improperly outside control band Service Valve Option If ordered, service valves are factoryinstalled on each circuit ...
Page 91 - Maintenance
SCXG-SVX01B-EN 9 1 Table M-GI-1. SCWG/SIWG/SCRG/SIRG General Maintenance Data Water-Cooled Units Air-Cooled Units Unit Size 2 0 2 5 3 0 3 5 2 0 2 5 3 2 Compressor Data Quantity 2 2 1/1 2 2 1/1 2 Nominal Ton/Comp 10 10 10/15 15 10 10/15 15 Circuits 2 2 2 2 2 2 2 Evaporator Coil Data Rows 2 4 4 4 3 4 ...
Page 92 - Maintenance Procedures; Air Filters
9 2 SCXG-SVX01B-EN Maintenance Procedures Air Filters Filter access doors are on the unit’s leftside. Filter access for the 2” filter rack onoptional steam and hot water coils andairside economizers is also on the left side Figure M-MP-1. Unit Filter Sizes and Placement for SXWG 20-38 tons or SXRG 2...
Page 94 - Supply Fan; Fan Drive
9 4 SCXG-SVX01B-EN Variable Frequency Drive (VFD) The VFD access panel is hinged to allowservice access to the fan motor and beltdrive components that are located behindit. To swing the panel open:• Remove the unit center cover panel to the left of the VFD panel. • Remove and discard the sheet metal...
Page 95 - Fan Bearings
SCXG-SVX01B-EN 9 5 Fan Bearings The opposite drive end bearing is aspecial bearing with close tolerance fit ofballs and races. Replace this bearing withthe same part number as the originalbearing. Follow the fan bearinglubrication schedules in Tables M-MP-1and M-MP-2. Use Table M-MP-3 toreference co...
Page 96 - Measure belt span between centers of
9 6 SCXG-SVX01B-EN Table M-MP-4. Fan shaft bearing torques setscrew hex-size recommended torque size across flats In-lb ft-lb 1/4"-20 1/8" 180 15 5-16"-18 5-32" 402 33.5 Table M-MP-5. Fan hub and sheave torques unit fan setscrew torque size dia. size (ft-lbs) SCWF 20 16.5" 5 / 16...
Page 97 - Adjusting Belt Tension; stretch the belts over the sheaves.
SCXG-SVX01B-EN 9 7 Adjusting Belt Tension NOTICEDo not over-tension belts. Exces-sive belt tension will reduce fanand motor bearing life, acceleratebelt wear, and possibly causeshaft failure. To adjust belt tension refer to Figure M-MP-6 and perform the followingprocedure:1. Loosen bolts A, B, and E...
Page 98 - Refrigerant System; Special Note on Refrigerant Emissions; Refrigerant Evacuation
9 8 SCXG-SVX01B-EN • To assist in reducing power generation emissions, always attempt to improveequipment performance with improvedmaintenance and operations that willhelp conserve energy resources. WARNING Confined Space Hazards! Do not work in confined spaces wheresufficient quantities o...
Page 99 - Refrigerant Leak Testing
SCXG-SVX01B-EN 9 9 WARNING Leak Testing! Do not exceed 200 psig when leaktesting system. Failure to follow theseinstructions could result in an explosioncausing death or serious injury. In the event of required system repair,leak test the liquid line, evaporator coil,and suction line at pr...
Page 100 - Complete the charging process by
100 SCXG-SVX01B-EN Figure M-MP-10. Typical water-cooled (SXWF) compressor section components To charge the system, complete thefollowing procedure:1. Charge liquid refrigerant into the liquid line service valve of each compressorcircuit. The vacuum will draw some ofthe required refrigerant into thes...
Page 101 - Coil Fin Cleaning; Inlet Guide Vanes; Spray all steel parts of guide vane
SCXG-SVX01B-EN 101 Coil Fin Cleaning Keep coils clean to maintain maximumperformance. For operation at its highestefficiency, clean the refrigerant coil oftenduring periods of high cooling demand orwhen dirty conditions prevail. Clean thecoil a minimum of once per year toprevent dirt buildup in the ...
Page 103 - Piping Components; Water Valves
SCXG-SVX01B-EN 103 1. Remove actuator motor from support plate. 2. Remove shaft coupling.3. Torque the packing nut to 10-ft.-lbs. of torque. 4. Replace shaft coupling.5. Replace actuator motor. Flow Switch Maintenance Flow switches have a magnet on thevane assembly that attracts ferrousparticulate m...
Page 104 - Monthly Checklist; Semi-Annual Maintenance
104 SCXG-SVX01B-EN Maintenance PeriodicChecklists Monthly Checklist The following check list provides therecommended maintenance schedule tokeep the commercial self-containedequipment running efficiently. WARNING Hazardous Voltage w/Capaci-tors! Disconnect all electric power, includingremo...
Page 105 - System Checks; Check all wiring and connections to be; Operating Procedures; troubleshooting
SCXG-SVX01B-EN 105 System Checks WARNING Live Electrical Components! During installation, testing, servicing andtroubleshooting of this product, it may benecessary to work with live electricalcomponents. Have a qualified licensedelectrician or other individual who hasbeen properly trained ...
Page 106 - Diagnostics; Auto Reset S/A Static Pressure Limit; diagnostics
106 SCXG-SVX01B-EN Diagnostics Refer to the IntelliPak Self-Contained Programming Guide, PKG-SVP01B-EN, for specific unit programming andtroubleshooting information. In particular,reference the “Service Mode Menu” and“Diagnostic Menu”sections in theprogramming guide. Refer to thefollowing text for g...
Page 108 - b. An “all heat off” request is issued to; Manual Reset SA Static Press Limit
108 SCXG-SVX01B-EN designated the heat module auxillarytemperature input as their input aredisabled. Reset Required: (PAR) An automatic resetoccurs after the heat module auxillarytemperature input returns to its allowablerange for 10 seconds. Heat Module Comm Failure Problem: The RTM has lostcommuni...
Page 109 - disables; Occupied Zone Heat Setpoint Failure
SCXG-SVX01B-EN 109 occurs after the mode input returns to itsallowable range for 10 seconds. N NSB Panel Zone Temperature SensorFailure Problem: The NSB panel's zone tempsensor input is out of range. (This input isat the NSB panel, not on the unit itself). Check: If have an external sensorconnected ...
Page 112 - open” request to “heat control”
112 SCXG-SVX01B-EN Reset Required: (PAR) An automatic resetoccurs after communication betweenTracer Summit and the LCI-I is restored. U Unit HI Communications Failure Problem: The RTM has lostcommunication with the unit mounted(local) human interface (HI). Check: Field/unit wiring between RTMhand lo...
Page 113 - Zone Cool Setpoint Failure
SCXG-SVX01B-EN 113 • A “fan off” request to “supply fan control” • A “close damper” request to “economizer actuator control” • The water pump to turn on and position all water valves to provide maximumflow through all water source heatexchangers • Disables preheat function if WSM mixed air temp sens...
