Carrier 30GN040-420 - Manuals

The TXV is set at the factory to maintain approximately 8 to 12° F (4.4 to 6.7° C) suction superheat leaving the coolerby monitoring the proper amount of refrigerant into the cooler.All TXVs are adjustable, but should not be adjusted unlessabsolutely necessary. When TXV is used, thermistors T7 andT8...

Head Pressure Control EXV UNITS (All 30GN units except 040 and 045 with op-tional brine) — The microprocessor controls the condenserfans in order to maintain the lowest condensing temperaturepossible, thus the highest unit efficiency. Instead of using theconventional head pressure control methods, t...

Table 5 — Condenser Fan Sequence FAN ARRANGEMENT 30GN FAN NUMBER(S) FAN CONTACTOR (FC) CONTROLLED BY 040-050 1 FC-A1 Compressor A1 2 FC-B1 Compressor B1 3 FC-A2 First Stage Microprocessor 4 FC-B2 Second Stage Microprocessor 060,070 1 FC-A1 Compressor A1 2 FC-B1 Compressor B1 3, 4 FC-A2 First Stage M...

Table 9 — Keypad Directory (cont) STATUS (cont) SUBFUNCTION KEYPAD ENTRY DISPLAY COMMENT 10 OUTPUTS (cont) EXVB X EXVB Percent Open** HGBA X† Hot Gas Bypass Relay Circuit A (on/off)** HGBB X† Hot Gas Bypass Relay Circuit B (on/off)** MMA X† Motormaster T A Output Percent** MMB X† Motormaster B Outpu...

Table 9 — Keypad Directory (cont) TEST (cont) SUBFUNCTION KEYPAD ENTRY DISPLAY COMMENT 2 COMPRESSORS AND UNLOADERS (cont) CPA3 X† Test Compressor A3 (on/off)** CPA4 X† Test Compressor A4 (on/off)** CPB1 X Test Compressor B1 (on/off) CPB2 X† Test Compressor B2 (on/off)** CPB3 X† Test Compressor B3 (o...

Table 9 — Keypad Directory (cont) SCHEDULE (cont) SUBFUNCTION KEYPAD ENTRY DISPLAY COMMENT 3 PERIOD 1 (cont) FRI X Friday Flag (yes/no) SAT X Saturday Flag (yes/no) SUN X Sunday Flag (yes/no) HOL X Holiday Flag (yes/no) To toggle between inputs (Yes/No) Press: (no) or (yes) 4 PERIOD 2 PERIOD 2 Perio...

Table 9 — Keypad Directory (cont) HISTORY SUBFUNCTION KEYPAD ENTRY DISPLAY COMMENT 1 RUN TIME RUN TIME Run Time Information HR X Total Hrs Unit Has a Comp Operating HRA X Circuit A Run Time HRB X Circuit B Run Time HA1 X Circuit A, Comp A1 Operating Hours HA2 X Circuit A, Comp A2 Operating Hours** H...

Table 9 — Keypad Directory (cont) SET POINT To read a set point, go to proper subfunction and read desired set point. To change a set point, enter new set point value, then press . LOCAL/ENABLE-STOP-CCN switch must be in LOCAL/ENABLE or STOP position. SUBFUNCTION KEYPAD ENTRY DISPLAY COMMENT 1 SET P...

Table 10 — Operational and Mode Display Codes The operating modes are displayed by name or code num- ber, to indicate the operating status of the unit at a giventime. The modes are: CODE DESCRIPTION LOCAL OFF Unit is off. LOCAL/ENABLE-STOP-CCN switch is inOFF position, or LOCAL/ENABLE-STOP-CCN switc...

Keypad entry allows the operator to make the following checks by using : • LID display check. Proper display is 8.8.8.8.8.8.8.8.• Operation of alarm relay.• Operation of condenser fans.• Operation of chilled fluid pump.• Operation of liquid line solenoids.• Operation of the hot gas bypass relays.• O...

Fig. 6 — Cooling External Temperature Reset LEGEND COMM — Communications BusPWR — Power SW — Switch NOTE: For specific connection points,see Fig. 25 - 29. Fig. 7 — 4 IN/4 OUT Options Module Wiring for Reset, Demand Limit, and Dual Set Point 41

Example 6 — Changing Reset Type To change type of reset, first log on as shown in Table 12. Also refer to Set Point Function section, page 38,for information on entering reset set points using resetfeature. KEYPAD DISPLAY COMMENTS ENTRY RESPONSE FLD CFG Field configurationsubfunction ofservice funct...

NOTE: This is true only if the occupied period starts at 00:00(midnight). If the occupied period starts at a time other thanmidnight, then the occupied period must end at 00:00 hours(midnight) and new occupied period must be programmedto start at 00:00 in order for the chiller to stay in the occu-pi...

Periods 4 and 5 can be programmed in the same manner, flagging Thursday and Friday yes for period 4 and Saturdayyes for period 5. For this example, periods 6, 7, and 8are not used: they should be programmed OCC 00.00,UNO 00.00.NOTE: When a day is flagged yes for 2 overlapping periods,occupied time w...

Unit Shutoff — To shut unit off, move LOCAL/ENABLE- STOP-CCN switch to STOP position. Any refrigeration cir-cuit operating at this time continues to complete the pum-pout cycle. Lag compressors stop immediately, and leadcompressors run to complete pumpout. Complete Unit Stoppage — Complete unit stop...

Table 16 — Alarm and Alert Codes DISPLAY ALARM DESCRIPTION ACTION TAKEN CIRCUIT RESET PROBABLE CAUSE OR ALERT BY CONTROL PUMPDOWN METHOD 0 — No Alarms or Alerts Exist — — — — 1 Alert Compressor A1 failure Circuit A shut down No Manual High-pressure switch trip, or wiringerror. 2, 3, 4 Compressor A2,...

Table 16 — Alarm and Alert Codes (cont) DISPLAY ALARM DESCRIPTION ACTION TAKEN CIRCUIT RESET PROBABLE CAUSE OR ALERT BY CONTROL PUMPDOWN METHOD 63 Alarm Complete unit shutdown Alarm only — Auto. Check individual alarms 64 Alert Loss of charge, circuit A Circuit cannot start — Auto. Refrigerant leak ...

vapor). To control refrigerant flow for different operating con-ditions, sleeve moves up and down over orifice, thereby chang-ing orifice size. Sleeve is moved by a linear stepper motor.Stepper motor moves in increments and is controlled di-rectly by the processor module. As stepper motor rotates,mo...

reading correctly. Connect a calibrated gage to leadcompressor suction or discharge pressure connectionto check transducer reading. e. Make sure transducer leads are properly connected in junction box and at processor board. Check trans-former 5 output. Check voltage transducer 5 vdc 6 .2 v. When ab...

Pressure Transducers — A single style of pressure transducer is used for both high- and low-pressure sensingon Flotronic™ II chillers. However, this transducer must becalibrated before the unit will operate. On new units, thiswill have been done at the factory in order to test run theunit. If a tran...

Fig. 15 — Thermistor Locations (Circuits A and B, Lead Compressor Only) FLUID-SIDE TEMPERATURE THERMISTOR T2 (ALL UNITS) COMPRESSOR SUCTION GAS TEMPERATURE THERMISTORS T7 AND T8 (ALL UNITS) AND FLUID-SIDE TEMPERATURE THERMISTOR T1 (ALL UNITS) Fig. 16 — Thermistors 61

TRANSDUCER REPLACEMENT Transducers are installed directly in the refrigerant cir-cuit. Relieve all refrigerant pressure using standard re-frigeration practices before removing. 1. Relieve refrigerant pressure using standard refrigeration practices. 2. Disconnect transducer wiring at transducer by pu...

Control Modules Turn controller power off before servicing controls. Thisensures safety and prevents damage to controller. PROCESSOR MODULE (PSIO), 4 IN/4 OUT MODULE(SIO), LOW-VOLTAGE RELAY MODULE (DSIO-LV),AND EXV DRIVER MODULE (DSIO-EXV) — The PSIO,DSIO and SIO modules all perform continuous diagn...

PROCESSOR MODULE (PSIO) (Fig. 20) Inputs — Each input channel has 3 terminals; only 2 of theterminals are used. Application of machine determines whichterminals are used. Always refer to individual unit wiringfor terminal numbers.Outputs — Output is 24 vdc. There are 3 terminals, only 2of which are ...

If accessory unloaders are desired, an accessory unloader package is used. Package includes a suction cutoff unloaderhead package. The 24-v coil in the package can be usedfor 040-110, 130 (60 Hz), and associated modular units(Table 1). A 115 v or 230 v coil must be used for 130(50 Hz), 150-210, and ...

Table 19 — Troubleshooting SYMPTOMS CAUSE REMEDY COMPRESSOR DOESNOT RUN Power line open Reset circuit breaker. Control fuse open Check control circuit for ground or short.Replace fuse. High-Pressure Switch (HPS)tripped Move LOCAL/ENABLE-STOP-CCN switch to STOPposition then back to RUN or CCN positio...

LEGEND C — Contactor PWR — Power CB — Circuit Breaker SW — Switch COMM — Communications Bus TRAN — Transformer HGBPR — Hot Gas Bypass Relay U — Unloader *Or HGBPR-A.†Or HGBPR-B. LEGEND COM — Communications Bus TB — Terminal Block HGBPR — Hot Gas Bypass Relay TRAN — Transformer NO — Normally Open U —...

FIELD WIRING Refer to Fig. 25-35 for field wiring. NOTE: Contacts must be rated for dry circuit application, capable ofreliably switching a 5 vdc, 1 mA to 20 mA load. Fig. 25 — Demand Limit — Two External Switch Inputs Fig. 26 − Demand Limit — 4-20 mA Signal (Externally Powered) Fig. 27 — Demand Lim...

REPLACING DEFECTIVE PROCESSOR MODULE The replacement part number is printed on a small label on the front of the PSIO module. The model and serial num-bers are printed on the unit nameplate located on an exteriorcorner post. The proper software and unit configuration datais factory installed by Carr...