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Trane RTAA 70-125 TON - page 1
A ugust 2005 RLC-S VD03A -EN © American Standard Inc. 2005 Model RT AA 70-1 25 T on RTWA 70-1 25 T on RTU A 7 0-125 T on Diagnostic T r oubleshooting Repair Ser ies R ® 70-125 T on Air -Cooled and W ater -Cooled Rotary Liquid Chillers ...
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Trane RTAA 70-125 TON - page 2
2 RLC-SVD03A-EN Import ant - Read This First! This manual is int ended f or exper ienced service personnel f amiliar with the proper use of electr ical diagnostic instruments and all personal saf ety pr ocedur es when wo r king on liv e electr ical cir cuits. This Manual is no t intended for individu als who have not been proper ly t rained in hand ...
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RLC-SVD03A-EN 3 Contents General Informati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Service Philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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4 RLC-SVD03A-EN General Inf ormation The Unit Control Modules (UCMs) described in this trouble shooting guide provide a microprocessor ba sed refrig eration control system, intended for use with T rane 70-1 25 ton helical roto r c hillers. Six t ypes of modules are used, and throughout this p ublication will be ref erred to by their abbre viations ...
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RLC-SVD03A-EN 5 General Inf ormation S ystem Descr iption The CPM is the master module and coordin ates operation of the entire system. One is used per c hiller . T he MCSP is a compressor protection module with one being u sed for eac h of the compressors in the c hiller . T he EXV is the e xpansion valv e controller module whic h controls t wo El ...
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6 RLC-SVD03A-EN General Inf ormation High Pressure Cutout S witc h Lo w Pressure Cuto ut Switc h V ariable Speed Fan Drive Motor T emperat ure T hermostats Slide V alve L oad/Unload Solenoids Step Load Solenoid V alve Chiller Module (CPM) IU 1 The CPM module perf orms mac hine (c h iller) lev el control and protection functions. Only one CPM is pre ...
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Trane RTAA 70-125 TON - page 7
RLC-SVD03A-EN 7 General Inf ormation Real t ime dat a fo r temperature s, diagno stics and control algorithms etc. are made a vailable to t he CPM and the other modules f or display and f or input to higher le vel fun ctions. See Electronic Expansion V alv e Module (EXV) (1U3) on page 58 f or details. Options Module (CSR) 1U2 The CSR module is an o ...
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Trane RTAA 70-125 TON - page 8
8 RLC-SVD03A-EN Interpr ocessor Communications The respective modules communicate with eac h other v ia an InterProcessor Communication link (IPC). The IPC allo ws the modules to work in a coordi- nated manner with the CPM directing ov erall c hiller operation while eac h module handles specific subf unctions. This IPC link is integr al and necessa ...
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Trane RTAA 70-125 TON - page 9
RLC-SVD03A-EN 9 Interpr ocessor Communication from the Options Modu le. When some problem ex ists with the IPC link or a module fa ils, it is not uncommon for more than on e of these IPC diagnostics to be displa yed . Note that only those diagnostics that ar e indicated to be active currently e xist. All other hist oric diagnostics should be disreg ...
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Trane RTAA 70-125 TON - page 10
10 RLC-SVD03A-EN Interpr ocessor Communication Figure 1 IPC Link Order For 70-125 T on RT AA * #,$ 5 * -3#0" 5 * -3#0! 5 * #32 5 * ) ...
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RLC-SVD03A-EN 11 Interpr ocessor Communication . 3. Loss of po wer t o a module: Generally a pow er loss to a particular module will only af f ect communica- tions with that mo dule. The module can usu ally be identified by analy sis of the IPC diag nostics. (When the displa y is blank, c hec k powe r at the CLD). L oss of pow er can most directly ...
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Trane RTAA 70-125 TON - page 12
12 RLC-SVD03A-EN Interpr ocessor Communication 5. Improper connections to terminal J2: Jac k J2, present o n all modules ex cept CLD , should hav e no connections. This inpu t is for manuf acturing te st purposes only and any con nections, shorts, etc. will potentially cause t he module to not respond, respond to the wrong address, or (in t he case ...
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Trane RTAA 70-125 TON - page 13
RLC-SVD03A-EN 13 Interpr ocessor Communication 3. Determine whic h modules are still t alkin g . Wiring up to these is likely to be OK. 4. T r y disconnecting th e link or jumping out mo dules in the link at v arious places (use Figu re 1 ). Reset the diagnostics an d note wh ic h diag nostics reappear . Here are some e xamples of IPC diagnostics: ...
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14 RLC-SVD03A-EN Interpr ocessor Communication The CPM has detected lo ss of comm unications with MCSP A, MCSP B , and EXV . Suspect an open early in the I PC link bet w een the CPM and MCSP B . The re are a large number of possible combinations of di agnostics. One must deduce what is causing the prob lem using all av ailable information. If the C ...
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Trane RTAA 70-125 TON - page 15
RLC-SVD03A-EN 15 T e mperature Sensor Chec kout With the ex ception of the thermo stats located in the motor windings of the screw compressors, all the temperat ure sensors used on the UCMs are negativ e temperat ure coef ficient (NTC) thermistors. T he thermistors employ ed all hav e a base resista nce of 1 0 K ohms at 77F (25C) and display a decr ...
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Trane RTAA 70-125 TON - page 16
16 RLC-SVD03A-EN T e mperature Sensor Chec kout 4. Again measure the temperat ure at the sensor with an accurate thermom- eter; record the te mperature reading obser ved. 5. Remo ve the sensor leads from the terminal strip or unplug the respective MT A. Measure the resist an ce of the sensor direct ly or probe the MT A with a digit al v olt-ohmmete ...
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Trane RTAA 70-125 TON - page 17
RLC-SVD03A-EN 17 T e mperature Sensor Chec kout . 1. Overall accu racy for any of the sensors is at l east + 2 F over the ra nge shown. Accur acy of matched sens ors is + 1 F over sp e cific ra nges. 2. As yo u compare a thermi stor resistance (or input voltag e) reading with the “actual” tempera ture indicated b y the thermometer, be sure to c ...
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Trane RTAA 70-125 TON - page 18
18 RLC-SVD03A-EN T e mperature Sensor Chec kout 1. Overall accu racy for the se nsor is at least + 2 F over the range shown. 2. As yo u compare a thermi stor resistance (or input voltag e) reading with the “actual” tempera ture indicated b y the thermometer, be sure to consider the location and precision of th e thermometer whe n you decide whe ...
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Trane RTAA 70-125 TON - page 19
RLC-SVD03A-EN 19 Compressor Operation This f eature is calle d the Auto L ead/Lag and can be fou nd in the Ser vice Set tings Group, under th e “Balance d CPRSR Starts and Hours” menu. When this function is disable d, the UCM alwa ys starts comp ressor “ A ” first. When this function is enabled, the follo wing occurs: The UCM equalizes oper ...
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Trane RTAA 70-125 TON - page 20
20 RLC-SVD03A-EN Compressor Star t/Stop T o st art a compressor af ter either a “nor mal' shutdown, a Diag nostic reset, or pow er -on-reset, the follo wing sequence will occur: 1 . On a call for a compressor , the Restart Inhibit Time r will time out, if any time remains. 2. The EXV is positioned to the initial closed start position. At the ...
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Trane RTAA 70-125 TON - page 21
RLC-SVD03A-EN 21 V ariable Speed In v er ter/Condenser F an Contr ol When Fa n Control and V ariable Speed Fan (VS F) are set to Enable in the Mac hine Configuration Me nu, the UCM will control both the v ariable speed fa n and the remaining constant speed f ans per the VSF Control Algor ithm. If VSF Control is disabled f or a given circuit but F a ...
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Trane RTAA 70-125 TON - page 22
22 RLC-SVD03A-EN V ariable Speed In v er ter/ Condenser F an Contr ol speed will also cause const ant speed f ans to s tage On and Off when the inv erter is co mmanded to full spee d and minimum speed respectively . The stage On (or Off) of a constant speed fan will occur if the in verter speed command is at max (or min.) f or three consecutiv e in ...
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Trane RTAA 70-125 TON - page 23
RLC-SVD03A-EN 23 Current T ransf ormer Eac h compressor motor has all three of its line currents monito red by tor roid (doughnut) current transf ormers. Wh ile the MCSP utilizes all three of the signals, it only display s the maximum phase at an y given time . These cur rents are normalized with re spect to the Rated Load Amps of the respective co ...
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Trane RTAA 70-125 TON - page 24
24 RLC-SVD03A-EN Current T ransf ormer will be display ed. If this protection is disabled, a 30% phase unbala nce will still be in ef fect with the diag nostic code Sev ere Phase Imbala nce being displayed. 6. Current Limit. The MCSP wil l begin to unload it s compressor as the %RLA ex ceeds 1 20%. F urther , the CP M will cause the compressors to ...
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Trane RTAA 70-125 TON - page 25
RLC-SVD03A-EN 25 Current T ransf ormer W ARNING Hazardous V oltage w/Capacitor s! Disconnect all electr ic power , including r emote disconnects befor e servicing. Follo w pr oper lock out/tagout pr ocedures t o ensur e the po wer cannot be inadver ten tly energiz ed. For v ar iable fr equency dr ives or o ther ener gy st or ing components pr o ...
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Trane RTAA 70-125 TON - page 26
26 RLC-SVD03A-EN Current T ransf ormer essar y to remove a cap o ver the top of the connector to gain access to the connector conductor s.) 6. Ref er to Ta b l e 7 whic h lists the normal resist ance range f or eac h exten- sion of cur rent transf ormer . Chec k the measured res istance against the value listed per transformer e xtension. If the re ...
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Trane RTAA 70-125 TON - page 27
RLC-SVD03A-EN 27 Current T ransf ormer with all phase currents to the compressors verified t o be within th eir nor- mal range, then the problem is either with the CT selection, MCSP Com- pressor O verload Dip S witc h Set ting , or the MCSP's current input, analog to digital (A/D), or dip switc h input circuitr y . Since the first two items w ...
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Trane RTAA 70-125 TON - page 28
28 RLC-SVD03A-EN Current T ransf ormer T able 5 Compressor Over load DIP Switch Settings Compr essor To n s Vo l t s / H z RLA Pr imary T ur ns Through Cur rent T ransf ormer Cur rent T ransf or mer Extension * Over load Set ting Dip S w/Decimal 12345 ** 35 200/60 1 1 5 1 -02 0 1 0 1 1/1 1 230/60 1 00 1 -0 1 1 1111 / 3 1 346/50 58 1 -1 0 0 1 1 00/1 ...
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RLC-SVD03A-EN 29 Current T ransf ormer T able 6 T r ip Times Vs. % Cur r ent MO T OR CURRENT (% RA TED RLA) MINIMUM TRIP TIME (SE C) NOMINAL MAXIMUM 1 27 .7 or below No trip No T rip No T rip 1 32.0 27 .2 No T rip No T rip 1 32.1 27 .2 30.08 No T rip 1 40.0 (must trip pt.) 22.8 25.28 28.09 1 50.0 1 8.8 20.48 22.89 1 60.0 1 6.0 1 7 .28 1 9 .29 1 70. ...
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30 RLC-SVD03A-EN Current T ransf ormer T able 8 Compressor Phase Cur rent vs. A C Input V oltage at MCSP ACTU AL COMPRESSOR PHASE AMPS THRU CT TERMINAL VO LT A G E (V RMS) % OF CT RA TING EXT -0 1 EXT -02 EXT -03 EXT -04 EXT -05 EXT -09 EXT -1 0 00 0 0 0 0 0 0 . 0 0 0 5 8 1 0 1 4 20 2.5 3.75 1 .1 9 5 1 0 1 5 20 28 40 5 7 .5 1 .37 1 0 1 5 23 30 41 6 ...
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RLC-SVD03A-EN 31 Current T ransf ormer T able 9 Over load Di p Switch Set ting vs. Internal Sof twar e Gain CPRSR RA TED RLA AS A % OF CT RA TING OV E R LOA D D P SWITCH SET TING DECIMAL SETTING SOFTW ARE GAIN 66 00000 00 1 .500000 67 00 00 1 0 1 1 .483870 68 00 0 1 0 02 1 .4677 43 69 00 0 1 1 03 1 .45161 3 70 00 1 0 0 04 1 .435483 71 00 1 1 0 06 1 ...
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32 RLC-SVD03A-EN Under -Ov er V oltage T ransf ormer The hardware required for the Under/Over v olt age sensing func tion of the UCM is st andard on the 70-1 25 T on RT AA c hiller . This f eat ure must be Enabled in the Ser vice Set tings Menu f or it to be active. A custom designe d transf ormer whose primar y is connected across the Line V oltag ...
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Trane RTAA 70-125 TON - page 33
RLC-SVD03A-EN 33 Under -Ov er V oltage T ransf ormer replacing the CPM, double c hec k the Under -Ov er V oltage F unction's Nominal Line V oltage Set up in the Ser vice Sett ings Group. 5. If the Under -Ov er V oltage P rotection function continues to misoperat e, and all of the abov e measure d ratios are within toler ance, and all CLD Under ...
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Trane RTAA 70-125 TON - page 34
RLC-SVD03A-EN 34 Compressor Capacity The 35 to 60 ton helical rotar y scre w compressors are loaded and unloaded by means of an intern al slide v alve an d a f emale unloader valve. In simple terms, these v alves can regulat e the amount of “bite ” of the compressor rotors as they t urn at r elatively const ant spee ds. The slide v alve is mo v ...
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Trane RTAA 70-125 TON - page 35
RLC-SVD03A-EN 35 Compressor Capacity Check out Procedur e for MCSP Load/Unload Outputs W ARNING Liv e Electrical Components! Dur i ng installation, t esting, servicing and tr oubleshooting of this pr oduct, it may be necessary t o w or k with live electr ical components. Hav e a qualified licensed electr ician or other individual who has been p ...
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Trane RTAA 70-125 TON - page 36
36 RLC-SVD03A-EN Compressor Capacity prev ent a compressor from loading even if the c hilled water setpoint is not satisfied. R efe r to the RT AA-IOM-4 for discussion on condenser , evap orator , and current limit ing functions and setpoints. R ef er to the Mode displa y under the Chiller Report on the CLD f or an i ndication of the current r u nn ...
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Trane RTAA 70-125 TON - page 37
RLC-SVD03A-EN 37 Compressor Capacity NO TE: Ena bling the “Compr essor T e st” only af f ect s whic h compressor will be cycled on ne xt and is not an ov er ride mode. T he c hiller will continue to operate normally (not withst andi ng circuit loc kout) and will stage compressors on and of f , as w ell as at tempt to modulate ru nning compresso ...
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Trane RTAA 70-125 TON - page 38
38 RLC-SVD03A-EN Compressor Capacity Unload NO TE: The f ollowing assume s that the compressor's slide valv e is already at some loaded position and %RLA is higher than the minimum noted in step 1. 1 . Manually close the Unload toggle swit c h to continuo usly energize the Unload Solenoid V alve. 2. If the %RLA decreases, th en the Unload V al ...
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Trane RTAA 70-125 TON - page 39
RLC-SVD03A-EN 39 Compressor Capacity pressure, then the Slide V alve is b ound. 5. If cylinder ca vity pressure does not decrease or is at suction pressure before the Unload toggle swit c h was closed, the prob lem lies with either the solenoid coil o r valv e. 6. Chec k coil 7 . If coil c hec ks out, change the valv e. NO TE: Ref er to the Flow Ch ...
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Trane RTAA 70-125 TON - page 40
40 RLC-SVD03A-EN Compressor Capacity W ARNING Liv e Electrical Components! Dur i ng installation, t esting, servicing and tr oubleshooting of this pr oduct, it may be necessary t o w or k with live electr ical components. Hav e a qualified licensed electr ician or other individual who has been pr oper ly trained in handling liv e electr ical co ...
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Trane RTAA 70-125 TON - page 41
RLC-SVD03A-EN 41 Module P o w er and Miscellaneous I/O This section will detail the normal volt age levels present on eac h of the modules inpu ts and outpu ts under various conditio ns or st ates. T ypica l operation of the I/O will be discussed in terms of c hiller operation. This should help the serviceman determine wh en and how t hey should f ...
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Trane RTAA 70-125 TON - page 42
42 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Clear Languag e Display (C LD) 1U6 Ke ypad Overview Local oper ator interface with th e system is accomplished using the 1 6 ke ys on the front of the Clear Langua ge Display panel. The readout scree n is a two line, 40 c haracter liquid cr ystal display with a bac klight. The bac klight allo w ...
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Trane RTAA 70-125 TON - page 43
RLC-SVD03A-EN 43 Module P o w er and Miscellaneous I/O Select Report Gr oup This gr oup of four k ey s allows the op erator to select and vie w the f ollowing reports: - Custom R eport - Chiller Report - Refrigerant Report - Compressor Report The Custom Report is the only report of the four that is defined by the operator . Any displa y under the o ...
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Trane RTAA 70-125 TON - page 44
44 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O When an y of the four rep ort ke ys are presse d, the first readout on th e display will be the header . The head er identifies the title of the report and summa- riz es the items in the report. The Next k ey and P revious k ey allo w the operator to scroll up and do wn through the displa y ite ...
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RLC-SVD03A-EN 45 Module P o w er and Miscellaneous I/O Press Ne xt to move do wn through the Chiller R eport. As shown in the figures, the flo wc hart e xplains the conditions that the UCM loo ks at to determine whic h readout is to be displa yed ne xt. F or examp le: Press Chiller R eport to dis pla y the header Press Ne xt to display MODE: [OPERA ...
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46 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O When updating is successfully completed, the system will default to the first displa y af ter the Chiller Report header: MODE: OPERA TING MODE] REQUESTED SE TPOINT SOURCE: [SETPT SO URCE] and the bac klight will be activated. LEDs The re are four LEDs locate d to the right of TB1 of the CLD mod ...
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Trane RTAA 70-125 TON - page 47
RLC-SVD03A-EN 47 Module P o w er and Miscellaneous I/O Te s t P o i n t s The re are t wo test points associated with the CPM module. T hey ar e easily read with a DC vo ltmeter by pr obing the PC board solder pads f ound in the upper lef t hand corner of the module. The positiv e meter lead should be connected to the pad while ref erencing the neg ...
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Trane RTAA 70-125 TON - page 48
48 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O I/O ter minal s F or the c hec kout of the I/O , ref er to the bloc k diagram of the module in Figure 10 and the Chiller Wiring Diagrams for both high and low voltage circuits. All vo lt ages are measured dif f erentially between terminal pairs sp ecified unless other wise indicate d. The first ...
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Trane RTAA 70-125 TON - page 49
RLC-SVD03A-EN 49 Module P o w er and Miscellaneous I/O T able 16 CPM (Chiller) Nomin al T ermin al Input and Output (1U1) Te r m i n a l Designation Descr iption of Circuit Nor mal T erminal V oltages for V arious Conditions J1 -4 to 3 to CLD J1 -2 to 1 to 1U5 IPC Communications 1 9.2 kbaud serial data, 5 volt signal le vel. Ref er to Interproce ss ...
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Trane RTAA 70-125 TON - page 50
50 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Options Module (CSR) (1U2) W ARNING Liv e Electrical Components! Dur i ng installation, t esting, servicing and tr oubleshooting of this pr oduct, it may be necessary t o w or k with live electr ical components. Hav e a qualified licensed electr ician or other individual who has been pr ope ...
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Trane RTAA 70-125 TON - page 51
RLC-SVD03A-EN 51 Module P o w er and Miscellaneous I/O 2. Has its negativ e terminal tied to c hassis ground. If the intended source does not meet the ab ov e requirement, an iso lation module must be used The 4-20mA/2-1 0VDC input s may be tested in the following wa ys: 1 . Enable External Chilled W ater Setpoint and/or Ex ternal Current Limit Set ...
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Trane RTAA 70-125 TON - page 52
52 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Setpoint Pr iority There are many w ay s in whic h the Ch illed W ater and Curren t Limit setpoints can be adjusted or reset when the Options Module is present in the Chiller control system. The follo wing flow c harts show how these methods are pr ior- itized and arbitrated under normal ope ra ...
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Trane RTAA 70-125 TON - page 53
RLC-SVD03A-EN 53 Module P o w er and Miscellaneous I/O “TRACER” implies Trane Integrated Comfort System remote device (ICS) using the di gital communicatio n link. “EXTERNAL” implies generic building automati on system or process controller interfac e using a 4-20ma loop or a 2-10 VDC analog signal. Figur e 1 1 Chilled W ater Setpoi nt Arbi ...
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Trane RTAA 70-125 TON - page 54
54 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O “TRACER” implies Trane Integrated Comfort System remote device (ICS) using the di gital communication link. “EXTERNAL” implies generic building automation system or process controller in terface using a 420ma loop or a 2-10 VDC a nalog signal. Figur e 12 Cur re nt Limit Setpoint Arbitra ...
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Trane RTAA 70-125 TON - page 55
RLC-SVD03A-EN 55 Module P o w er and Miscellaneous I/O ICS Communications ICS (T racer) communication is handled the same as on previo us products using the T rane proprietar y Comm3 st andard 1 20 0 baud isolated serial communication link. T he f ollowing are some thing s to c hec k when experi- encing loss of ICS communications: 1 . If ICS contro ...
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Trane RTAA 70-125 TON - page 56
56 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O T able 19 CSR Normal T er minal V olt ages f or Options Module 1U2 Te r m i n a l Designation Descr iption of Cir cuit Nor mal T er minal V oltages for V ar ious Conditions J1 -4 to 3 or J1 -2 to 1 IPC Communications 1 9.2 kbaud seri al dat a, 5 volt signal lev el. Ref er to Int erprocessor Com ...
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Trane RTAA 70-125 TON - page 57
RLC-SVD03A-EN 57 Module P o w er and Miscellaneous I/O ° TP1 +5V ° TP2 + 6V J6-1 — 1 1 5V A C HO T J6-2 — 1 1 5V A C HO T ° TP2 + 1 2V J6-3 — KEY (N/C) J6-4 — NEU TRAL IPC (+) — J1 -4 J6-5 — NEU TRAL IPC (-) — J1 -3 IPC (+) — J1 -2 IPC (-) — J1 -1 MANUF . NO C ONN. — J2-2 USE ONL Y NO CONN. — J2-1 1 S W 1 2 O N H L I 0 ZONE ...
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Trane RTAA 70-125 TON - page 58
58 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Electr onic Expansion V alve Module (EXV) (1U3) W ARNING Liv e Electrical Components! Dur i ng installation, t esting, servicing and tr oubleshooting of this pr oduct, it may be necessary t o w or k with live electr ical components. Hav e a qualified licensed electr ician or other individua ...
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Trane RTAA 70-125 TON - page 59
RLC-SVD03A-EN 59 Module P o w er and Miscellaneous I/O A “FLA G” stop is located at either end of the threaded portion of t he motor shaf t. The stops inter f ere with the milled flag on the driv e coupling, restricting rotation of the motor shaf t and producing a clic king sound when the v alve is driven fully OPEN or CLOSED . SEHI-1 00 V alve ...
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Trane RTAA 70-125 TON - page 60
60 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Electr onic Expansion V alv e Location The valve sho uld be inst alled with the motor in a v ertical position, or no greater than 45° from vertical, as shown in Figure 1 6 . This will prev ent oil logging and the possibil it y of contamination reac hing the motor cavity . T he valv e should al ...
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Trane RTAA 70-125 TON - page 61
RLC-SVD03A-EN 61 Module P o w er and Miscellaneous I/O Te s t P o i n t s There is only on e test point associated with the EXV module. It is easily read with a DC voltmete r by probing the PC board sold er pad found in the upp er lef t hand corner of the module. T he positive meter le ad should be connected to the pad while ref erencing the negati ...
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Trane RTAA 70-125 TON - page 62
62 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O diagnostic sugg ests that there is a problem with the v alv e or the valv e wiring. T o confirm this, it is necessar y to continue the procedure. T he Electrical Integrit y test will be completed in about 2 seconds. Regardless of whether or not a diagnostic occu rs, the UCM will proceed with th ...
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Trane RTAA 70-125 TON - page 63
RLC-SVD03A-EN 63 Module P o w er and Miscellaneous I/O 3. Chec k the resist ance from eac h of the three phase pins (J4-3, J4-2, and J4-1) to the boar d edge GND , with the conne ctor unplugge d. This resis- tance should be between 1 00K and 200K ohms. If the v alve/wiring/ connector combination fails th e abov e tests, suspect the connector or the ...
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Trane RTAA 70-125 TON - page 64
64 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O used, it is important to direct the flame aw ay f rom the va lve body . See Figure 17 . A wet cloth should be wrapped around the body during sold ering to provide e xtra protection. This will help prev ent ov erheating and damage to the synthetic seals and subse quent degradation in valv e perf ...
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Trane RTAA 70-125 TON - page 65
RLC-SVD03A-EN 65 Module P o w er and Miscellaneous I/O 2. Disconnect all the line v oltage to the pow er supply of this unit. 3. Ref er to the e xploded view in Figure 1 8 while pe rforming the remaining instructions. CA UTION P rev ent Injur y! Ref er to Figur e 18 . The pushrod is under spr ing pr essure and will be acceler ated out of the t ...
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Trane RTAA 70-125 TON - page 66
66 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O to the v alve body until t he sealing surfaces mak e contact. Tighten the actu ator approximately 1/8 t urn to seal the knif e edge joint. 1 2. The motor cap quad-ring ma y be replaced by removing the f err ule motor cap nut. Be sur e that the motor cap does not r otate with the mot or cap nut. ...
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Trane RTAA 70-125 TON - page 67
RLC-SVD03A-EN 67 Module P o w er and Miscellaneous I/O SEHI Electr onic Expansion V alve Servicing The procedures liste d below are to. be follow ed for proper d isassembly , inspection, cleaning and reassembly to the valv e. The v alve does not ne ed to be remov ed from th e refrigerant pipin g before ser vicing . If the motor is found to be def e ...
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Trane RTAA 70-125 TON - page 68
68 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Figur e 19 SEHI Electr onic Expansion V alve Exploded V iew -OTOR!DAPT OR !SSEMBLY 0ISTON!SSEMBLY "ODY!SSEMBLY 3IGHTGLASS ...
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Trane RTAA 70-125 TON - page 69
RLC-SVD03A-EN 69 Module P o w er and Miscellaneous I/O SEO V alve Module ° TP1 +5V J 6-1 — 1 1 5V AC H OT J6-2 — 1 1 5V A C HO T J6-3 — KEY (N/C) J6-4 — NEU TRAL IPC (+) — J1 -4 J6-5 — NEU TRAL IPC (-) — J1 -3 IPC (+) — J1 -2 IPC (-) — J1 -1 MANUF . NO CONN. — J2-2 USE ONL Y NO CONN. — J2-1 L H 0 LO W PRESSURE SIG.— J7 -5 I ...
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Trane RTAA 70-125 TON - page 70
70 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O I/0 ter minal s F or the c hec kout of the I/O , ref er to the bloc k diagram of the EXV module in T able 21 and the Chiller W iring Diagrams for both high and lo w voltage circuits. All volt ages are measur ed dif f erentl y between termin al pairs SEHI V alve Module ° TP1 +5V J 6-1 — 1 1 5 ...
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Trane RTAA 70-125 TON - page 71
RLC-SVD03A-EN 71 Module P o w er and Miscellaneous I/O specified, unless ot her wise indicated. Th e first te rminal in the pair is the positive (or hot) terminal. V olt ages giv en are nominals and ma y vary by ±5%. Unregulated V oltages (unreg) or 1 1 5 V A C voltages may v ar y by ±1 5%. T able 21 EXV Module Nor mal T er minal V oltages Te r m ...
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Trane RTAA 70-125 TON - page 72
72 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Compr essor Module (MCSP) (1U4 AND 1U5) W ARNING Liv e Electrical Components! Dur i ng installation, t esting, servicing and tr oubleshooting of this pr oduct, it may be necessary t o w or k with live electr ical components. Hav e a qualified licensed electr ician or other individual who ha ...
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Trane RTAA 70-125 TON - page 73
RLC-SVD03A-EN 73 Module P o w er and Miscellaneous I/O Binary Inputs The binar y inputs shown in T able 22 all use the same basic circuit . A pullup resistor to the 1 2V pow er supply is connected to the higher numbered input pin. T he low er numbered pin is connected to g round. The v olt age between the two pins is sensed b y the microprocessor T ...
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Trane RTAA 70-125 TON - page 74
74 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O the currents are higher than actual and will sho w up as a n error in the %RLA displa yed b y the CPM. Th e compressor will operate safely but ma y unload due to the c urrent limit functio n. Ref er to Current T ransformer s and Current Inputs f or more details on operation an d troubleshooting ...
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Trane RTAA 70-125 TON - page 75
RLC-SVD03A-EN 75 Module P o w er and Miscellaneous I/O I/O T er minals F or the c hec kout of the I/O, ref er to the block diagram of the MCSP module in Figure 22 and the Chiller Wiring Diagrams for both high and low voltage circuits. All volt ages are measur ed dif f erenti ally between term inal pairs specified un less other wise indicat ed. The ...
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Trane RTAA 70-125 TON - page 76
76 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O J7 -8,9 Step Load Solenoid N ormally open contact, clos es to energize the Step L oad Solenoid V a lve. J7 -1, E7 Slide V alve Open (Load Solenoid) Output T riac Output, Ref er to Chec kout P rocedure for MCSP Load/Unload Outputs. J7 -1, E8 Slide V alve Close (Unload Solenoid) Output T riac Out ...
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Trane RTAA 70-125 TON - page 77
RLC-SVD03A-EN 77 Module P o w er and Miscellaneous I/O ° TP1 +5V ° TP2 +1 2V J6-1 — 1 1 5V A C HO T J6-2 — 1 1 5V A C HO T J6-3 — KEY (N/C) J6-4 — NEUTRAL IPC (+) — J1 -4 J6-5 — NEUTRAL IPC (-) — J1 -3 IPC (+) — J1 -2 E3 — COMPRESSOR MO T OR IPC (-) — J1 -1 E4 — WINDI NG THERMOST . MANUF . NO CONN. — J2-2 E5 — HIGH PRESS ...
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Trane RTAA 70-125 TON - page 78
78 RLC-SVD03A-EN Module P o w er and Miscellaneous I/O Inter pr ocessor Communication Bridg e Module (IPCB) (1U7) The IPCB provides an extension of the IPC link to th e Remote Clear Lang uage Display . See Figure 23 It prev ents “crashes” of the IPC and UCM if t he link to the RC LD is shorted or misapplied. T he IPCB receives and re transmits ...
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Trane RTAA 70-125 TON - page 79
RLC-SVD03A-EN 79 Module P o w er and Miscellaneous I/O LonT alk® Communications Inte rf ace - Chillers Module (LCI-C) (1U8) The T racer LCI -C interf ace acts as a tr anslator bet w een T rane's IPC (Inter - Processor Communication ) and Ec he lon' s LonT alk® communications protocol (ANSI/EIA/CEA 709.1). This allows th e c hiller to co ...
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Trane RTAA 70-125 TON - page 80
80 RLC-SVD03A-EN V ariable Speed F an System The purpose of this troubleshooting guid e is to help tec hnicians determine if the v ariable speed f an inv erter , the compressor module, the vari able speed fa n inv erter contactor , the f an motor or the inte rconnecting wiring is f aulty . W ARNING Hazar dous V o ltag e w/Capacitors! Disconnect ...
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Trane RTAA 70-125 TON - page 81
RLC-SVD03A-EN 81 V ariable Speed F an System Bus Ov er voltage Fau lt 2 Motor Overload F ault 3 Lo w Bus V oltage Fault 4 PWM Gene rator Fault 5 Log i c Fa u l t 6 Stalled Motor F ault 7 F ault Descr iptions Bus Over curr ent F ault: DC Bus Current e xce eds the driv e rated peak current. Bus Overv oltage F ault : DC Bus V oltage ex ceeds 40 0 VDC ...
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Trane RTAA 70-125 TON - page 82
82 RLC-SVD03A-EN V ariable Speed F an System T roubleshooting Pr ocedur e W ARNING Liv e Electrical Components! Dur i ng installation, t esting, servicing and tr oubleshooting of this pr oduct, it may be necessary t o w or k with live electr ical components. Hav e a qualified licensed electr ician or other individual who has been pr oper ly tra ...
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Trane RTAA 70-125 TON - page 83
RLC-SVD03A-EN 83 V ariable Speed F an System .6 VDC. If there is n o voltage at either of th ese t wo test points, c hec k the incoming 1 1 5 V A C bet w een pins J6-1 (hot) and J6-5 (neutral) and c hec k fuse F1, mo unted on th e upper righ t-hand corner o f the circuit board. If the fuse is OK and the voltage between J6-1 and J6- 5 is 1 1 5 VDC, ...
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Trane RTAA 70-125 TON - page 84
84 RLC-SVD03A-EN V ariable Speed F an System on at both ends while measuring this voltage. If the reading is between 1 1 .5 and 1 2.5 VDC, two problems m ay e x ist: • The in verter indicates that it has a fault b y opening a semiconductor switc h within the inverter . The in verter will send a f ault signal to the UCM when: – It has gone throu ...
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Trane RTAA 70-125 TON - page 85
RLC-SVD03A-EN 85 Other S er vice F eatures Service Pumpdo wn The UCM pro vides for a "one time" Ser vice Pumpdo wn mode, in whic h a ser vice-tec hnician can direct a particul ar compressor to start and run f or one minute, to accomplish pumpdown of the low side of the r efrigeration system (ev aporator and EXV). T o aid in accomplishing ...
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Trane RTAA 70-125 TON - page 86
86 RLC-SVD03A-EN Other S er vice F eatures W ARNING Hazar dous V o ltag e w/Capacitors! Disconnect all electr ic power , including r emote disconnects befor e servicing. Follo w pr oper lock out/tagout pr ocedures t o ensur e the po wer cannot be inadver ten tly energiz ed. For v ar iable fr equency dr ives or o ther ener gy st or ing component ...
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Trane RTAA 70-125 TON - page 87
RLC-SVD03A-EN 87 Other S er vice F eatures tioned (if not already controlling). Most of ten the st age-on will be ac com- panied b y a controlled stage-of f of an already r unning compressor . Since normal operation is in ef f ect, a constant load or setpoint c hange may be required to k eep the compressor fr om st aging of f later . Circ uit Lock ...
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Trane RTAA 70-125 TON - page 88
T rane ha s a policy of continuous product d ata and p roduct improv ement and reser ves the right to c han ge design and specifications without notice. Only qualified tec h nicians should perform the inst allation and ser vi cing of equipment referred to in this bulletin. Literature Order Number RLC-SVD03A-EN File Number SV -RF -RLC-SVD03A-EN-0805 ...
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