Carrier 50TZ user guide manual

50TZ/YZ 38FZ/BZ-40TZ/BZ

Single-Package Cooling Units and Heat Pumps

Installation, operation and maintenance instructions

Carrier is participating in the Eurovent Certification Programme. Products are as listed in the Eurovent Directory of Certified Products.

CONTENTS

Page

START-UP CHECK LIST 3

PHYSICAL DATA 4

ELECTRICAL DATA 5

DIMENSIONS 6

Service area 27 Coordinates for the centre of gravity 28 Weight distribution 29

AIR DISCHARGE 30

FAN PERFORMANCES 31

SAFETY CONSIDERATIONS 33

INSTALLATION 33

Siting the unit 33 Rigging 33 Ductwork 33 Condensate and rainwater drainage 34

ELECTRICAL CONNECTIONS 34 Electrical connection between units 34 Thermostat connection 34

REFRIGERANT LINE CONNECTIONS 35 Refrigerant line selection 35 Checks before start-up 36

Page

REFRIGERANT CHARGE 36

Gas tightness testing and dehydration 36

START-UP 37

REFRIGERANT SYSTEM DESCRIPTION 37

COMPRESSOR REPLACEMENT 37

DESCRIPTION OF UNIT SAFETY DEVICES 37

Operating limits 38

CONTROL SEQUENCE 38

OPTIONS/ACCESSORIES 38

GENERAL MAINTENANCE 38

SERVICE 38

Lubrication 38 Servicing recommendations 39

TRANSFORMATION TO SPLIT SYSTEM 39

FINAL RECOMMENDATIONS 39

TROUBLESHOOTING CHART 40

START-UP CHECK LIST Start up date: .....................................................................

Equipment sold by: ......................................................................................................................................... Contract No: .....................................................

Installed by: ...................................................................................................................................................... Contract No: .....................................................

Site address: .......................................................................................................................................................................................................................................

Equipment type and serial No: 50TZ/YZ ...........................................................................................................................................................................................

38FZ/BZ ...........................................................................................................................................................................................

40TZ/BZ ........................................................................................................................................................................................

ELECTRICAL DATA:

Supply voltage Ph 1: .

........................ Volts Ph 2: .................... Volts Ph 3 .......................Volts

Nominal voltage:

.............................................. Volts % network voltage: .................................................................................................................

Current draw Ph 1: .................................... Amperes Ph 2: ............................... Amperes Ph 3: .......................................... Amperes

Control circuit voltage:

................................... Volts Control circuit fuse: ...............................................................................................Amperes

Main circuit breaker rating:

............................................................................................................................................................................................................

PHYSICAL DATA:

Outdoor unit : Indoor unit :

Entering air temp.:

................................................................

C Entering air temp.: ..............................................................oC

Leaving air temp.:

................................................................

C Leaving air temp.: ..............................................................oC

Pressure drop (air):

.............................................................. kPa Pressure drop (air): ............................................................. kPa

Discharge air pressure:

....................................................... Pa Discharge air pressure: ...................................................... Pa

Fan motor input: Ph. 1:

........................................... Volts Fan motor input: Ph. 1: .......................................... Volts

Ph. 2:

........................................... Volts Ph. 2: .......................................... Volts

Ph. 3:

........................................... Volts Ph. 3: .......................................... Volts

SAFETY DEVICE SETTING 38TA UNIT:

High pressure switch: cut-out:

............................................. kPa cut-in: ............................................................... kPa

Low pressure switch: cut-out:

............................................. kPa cut-in: ................................................................. kPa

Step controller: cut-out 1st step:

...............................

C cut-in 1st step: .................................................. oC

cut-out 2nd step:

..............................

C cut-in 2 nd step: ...............................................

Oil level:

Oil visible in sight glass? .........................................................................................................................................................................................................................

ACCESSORIES

Commissioning engineer (name):

Customer agreement

Name:

.......................................................................................... Date: ..............................................................................................................................

Remarks:

Note: Complete this start-up list at the time of installation

Table 1 - Physical data

50TZ 024 036 042 048 060 072 084

Nominal cooling capacity* kW 6.50 9.11 10.50 12.00 14.80 19.10 22.74

Operating weight kg

50TZ 168 193 211 241 267 329 381 40TZ/BZ 58 63 71 76 87 116 120 38FZ 110 130 140 165 180 213 261

Compressor Hermetic reciprocating compressor Oil charge l 1.18 1.50 1.65 1.65 1.65 1.65 2.84 Oil type Mobil 22 BC POE Maneurop 160PZ

Refrigerant R-407C Refrigerant charge** kg 1.88 2.23 2.83 3.32 4.56 5.17 7.72

Indoor section (40TZ/BZ) Copper tubes, pretreated aluminium fins Face area m

0.20 0.30 0.35 0.39 0.41 0.61 0.61 Rows ... fin spacing mm 3 ... 1.82 3 ... 2.12 3 ... 2.12 3 ... 2.12 3 ... 2.12 3 ... 2.12 4 ... 2.12 Test pressure bar 30 30 30 30 30 30 30

Outdoor section (38FZ) Copper tubes, pretreated aluminium fins Face area m

0.31 0.38 0.45 0.53 0.60 0.70 0.76 Rows ... fin spacing mm 4 ... 1.82 4 ... 1.82 4 ... 1.82 5 ... 1.82 5 ...1.59 5 ... 2.12 6 ... 2.12 Test pressure kPa 30 30 30 30 30 30 30

Indoor fan (40TZ/BZ) One ... dual-inlet, centrifugal Nominal air flow l/s 400 565 670 670 950 1320 1365 Nominal air flow range l/s 340-460 480-650 570-770 570-770 760-1090 1050-1520 1100-1570 Nominal static pressure (dry/wet) Pa 50-40 60-50 60-50 60-50 90-80 120-110 120-110

Outdoor fan (38FZ) One ... dual-inlet, centrifugal Nominal air flow l/s 530 800 865 865 1350 1650 1875 Nominal air flow range l/s 450-600 680-900 730-940 730-970 1085-1475 1320-1800 1500-2150 Nominal static pressure Pa 30 30 30 40 50 50 50

Indoor air filter One filter, thickness 7 mm, filter class M1 Width x height mm 312 x 336 352 x 378 387 x 394 387 x 394 397 x 434 542 x 524 542 x 524

Condensing unit 38FZ 024 036 042 048 060 072 084

Nominal cooling capacity*** kW 6.00 8.22 9.00 11.22 13.95 17.38 20.25

* Based on an outdoor air dry bulb temperature of 35°C and an indoor air wet bulb temperature of 19°C. ** The refrigerant charge given is for the complete system, but does not include the connection lines. *** Based on an outdoor air dry bulb temperature of 35°C and a dewpoint suction temperature of 7°C.

Table 2 - Physical data

50YZ 024 036 042 048 060 072 084

Nominal cooling capacity* kW 6.20 8.90 10.10 11.56 14.34 19.10 22.20 Nominal heating capacity** kW 6.52 9.50 11.30 12.50 16.84 21.80 25.00

Operating weight kg

50YZ 170 196 214 244 270 332 385 40BZ 58 63 71 76 87 116 120 38BZ 112 133 143 168 183 216 265

Compressor Hermetic reciprocating compressor Oil charge l 1.18 1.50 1.65 1.65 1.65 1.65 2.84 Oil type Mobil 22 BC POE Maneurop 160PZ

Refrigerant R-407C Refrigerant charge*** kg 2.07 2.73 3.32 3.43 4.87 5.57 7.44

Indoor section (40BZ) Copper tubes, pretreated aluminium fins Face area m

0.20 0.30 0.35 0.39 0.41 0.61 0.61 Rows ... fin spacing mm 3 ... 1.82 3 ... 1.82 3 ...1.82 3 ... 1.82 3 ... 1.59 3 ... 2.12 4 ... 2.12 Test pressure bar 30 30 30 30 30 30 30

Outdoor section (38BZ) Copper tubes, pretreated aluminium fins Face area m

0.31 0.38 0.45 0.53 0.60 0.70 0.76 Rows ... fin spacing mm 4 ... 1,82 4 ... 1.82 4 ... 1.82 5 ... 1.82 5 ...1.59 5 ... 2.12 6 ... 2.12 Test pressure kPa 30 30 30 30 30 30 30

Indoor fan (40BZ) One ... dual inlet, centrifugal Nominal air flow l/s 400 565 670 670 950 1320 1365 Nominal air flow range l/s 340-460 480-650 570-770 570-770 760-1090 1050-1520 1100-1570 Nominal static pressure (dry/wet) Pa 50-40 60-50 60-50 60-50 90-80 120-110 120-110

Outdoor fan (38BZ) One ... dual inlet, centrifugal Nominal air flow l/s 530 800 865 865 1350 1650 1875 Nominal air flow range l/s 450-600 680-900 730-940 730-970 1085-1475 1320-1800 1500-2150 Nominal static pressure Pa 30 30 30 40 50 50 50

Indoor air filter One filter, thickness 7 mm, filter class M1 Width x height mm 312 x 336 352 x 378 387 x 394 387 x 394 397 x 434 542 x 524 542 x 524

* Based on an outdoor air dry bulb temperature of 35°C and an indoor air wet bulb temperature of 19°C. ** Based on an outdoor air wet bulb temperature of 6°C and an indoor dry bulb temperature of 20°C. *** The refrigerant charge given is for the complete system, but does not include the connection lines.

Table 3 - Electrical data

50TZ (40TZ/BZ + 38BZ) 024 036 042 048 060 072 084

Nominal voltage (± 10%)* V 230 400 230 400 230 400 230 400 230 400 230 400 230 400

Nominal power input** kW 2.90 2.90 3.99 3.99 4.68 4.68 5.07 5.07 7.37 7.37 10.08 10.08 10.75 10.75

Nominal current drawn** A 13.33 6.30 12.50 8.74 15.58 11.50 16.98 12.23 25.49 18.54 30.12 17.41 33.19 19.18

Effective power input kW 2.90 2.90 3.89 3.89 4.54 4.54 4.93 4.93 6.96 6.96 9.39 9.39 9.99 9.99

Effective current drawn A 13.33 6.30 12.19 8.52 15.11 11.16 16.51 11.89 24.07 17.51 28.06 16.22 30.67 17.73

Starting current A 86 46 99 60 117 72 134 81 159 105 170 90 162 105

Maximum power input*** kW 3.24 3.24 4.53 4.53 5.23 5.23 5.71 5.71 8.00 8.00 10.74 10.74 11.95 11.95

Maximum current drawn*** A 14.88 7.04 14.19 9.92 17.42 12.86 19.13 13.78 27.67 20.13 32.09 18.55 35.93 20.77

* The unit power supply is three phase (except size 024, 230 V, which is single-phase). The fan power supply is single phase, except for sizes 072 and 084 which are three phase. ** Based on an outdoor air dry bulb temperature of 35°C and an indoor temperature of 19°C wet bulb and 27°C dry bulb. *** Based on an outdoor air dry bulb temperature of 46°C and an indoor air wet bulb temperature of 21°C.

Note: The effective power input is according to EUROVENT.

Condensing unit 38FZ 024 036 042 048 060 072 084

Nominal voltage (± 10%)* V 230 400 230 400 230 400 230 400 230 400 230 400 230 400

Nominal power input** kW 2.45 2.45 3.63 3.63 4.04 4.04 4.51 4.51 6.49 6.49 8.52 8.52 9.16 9.16

Nominal current drawn** A 11.25 5.32 11.37 7.95 13.45 9.93 15.11 10.89 22.45 16.33 25.46 14.72 28.27 16.34

Effective power input kW 2.45 2.45 3.63 3.63 4.04 4.04 4.51 4.51 6.26 6.26 8.24 8.24 8.85 8.85

Effective current drawn A 11.26 5.32 11.38 7.95 13.45 9.93 15.10 10.88 21.65 15.75 24.62 14.23 27.31 15.79

Starting current A 84.6 44.6 97.1 58.1 114.6 69.6 131.6 78.6 154.8 100.8 166.5 88.0 157.2 102.2

Maximum power input*** kW 3.02 3.02 4.14 4.14 4.66 4.66 5.38 5.38 7.60 7.60 10.06 10.06 10.75 10.75

Maximum current drawn*** A 13.9 6.6 13.0 9.1 15.5 11.5 18.0 13.0 26.3 19.1 30.1 17.4 33.19 19.18

Note: The effective power input is according to EUROVENT.

Table 4 - Electrical data

50YZ (40BZ + 38BZ) 024 036 042 048 060 072 084

Nominal voltage (± 10%)* V 230 400 230 400 230 400 230 400 230 400 230 400 230 400

Nominal power input kW

Cooling** 2.74 2.74 4.20 4.20 4.70 4.70 5.04 5.04 7.57 7.57 10.10 10.10 10.92 10.92 Heating*** 2.35 2.35 3.51 3.51 4.00 4.00 4.55 4.55 6.97 6.97 9.07 9.07 9.58 9.58

Nominal current drawn A Cooling** 12.77 6.04 13.89 10.06 15.79 11.40 17.10 12.43 25.29 18.06 30.00 17.34 33.65 19.45 Heating*** 11.21 5.30 12.00 8.87 14.14 10.60 15.76 11.65 24.09 17.57 27.59 15.95 30.79 17.80

Effective power input kW Cooling 2.74 2.74 4.10 4.10 4.56 4.56 4.90 4.90 7.16 7.16 9.41 9.41 10.16 10.16 Heating 2.35 2.35 3.41 3.41 3.86 3.86 4.41 4.41 6.56 6.56 8.38 8.38 8.82 8.82

Effective current drawn A Cooling 12.76 6.04 13.56 9.82 15.32 11.06 16.63 12.09 23.92 17.08 27.96 16.16 31.14 18.00 Heating 11.20 5.30 11.66 8.62 13.65 10.23 15.28 11.30 22.68 16.54 25.50 14.74 28.28 16.35

Starting current A 86 46 99 60 117 72 134 81 159 105 170 90 162 105

Maximum power input*** kW

Cooling**** 3.08 3.08 4.65 4.65 5.22 5.22 5.66 5.66 8.26 8.26 11.06 11.06 12.04 12.04 Heating***** 2.78 2.78 4.07 4.07 4.63 4.63 5.09 5.09 7.70 7.70 10.54 10.54 11.87 11.87

Maximum current drawn*** A Cooling**** 14.17 6.70 14.86 10.54 17.24 12.28 18.23 12.91 27.10 19.03 32.87 19.00 35.94 20.78 Heating***** 12.79 6.05 13.01 9.23 15.29 10.89 16.39 11.61 25.26 17.74 31.32 18.11 35.44 20.48

* The unit power supply is three phase (except size 024, 230 V, which is single-phase). The fan power supply is single phase, except for sizes 072 and 084 which are three phase. ** Based on an outdoor air dry bulb temperature of 35°C and an indoor temperature of 19°C wet bulb. *** Based on an outdoor air wet bulb temperature of 6°C and an indoor temperature of 20°C dry bulb. **** Based on an outdoor air dry bulb temperature of 46°C and an indoor air wet bulb temperature of 21°C. ***** Based on an outdoor air wet bulb temperature of 18°C.

Note: The effective power input is according to EUROVENT.

Fig. 1 - Dimensions, mm

50TZ/YZ 024

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

View on indoor air supply/return

Plan view

View on outdoor air supply/return

Note: Standard air supply and return

Fig. 2 - Dimensions, mm

50TZ/YZ 036

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on indoor air supply/return

Plan view

View on outdoor air supply/return

Fig. 3 - Dimensions, mm

50TZ/YZ 042

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on indoor air supply/return

Plan view

View on outdoor air supply/return

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Fig. 4 - Dimensions, mm

50TZ/YZ 048

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on indoor air supply/return

Plan view

View on outdoor air supply/return

Fig. 5 - Dimensions, mm

50TZ/YZ 060

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on indoor air supply/return

View on outdoor air supply/return

Plan view

Fig. 6 - Dimensions, mm

50TZ/YZ 072

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on indoor air supply/return

View on outdoor air supply/return

Plan view

Fig. 7 - Dimensions, mm

50TZ/YZ 084

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on outdoor air supply/return

View on indoor air supply/return

Plan view

Fig. 8 - Dimensions, mm

38FZ/BZ 024

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Note: Standard air supply and return

Plan view

View on refrigerant line connection side

View on outdoor air supply/return

Refrigerant line connection

Fig. 9 - Dimensions, mm

38FZ/BZ 036

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

View on refrigerant line connection side

Plan view

View on outdoor air supply/return

Refrigerant line connection

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Fig. 10 - Dimensions, mm

38FZ/BZ 042

Note: Standard air supply and return

View on refrigerant line connection side

Plan view

View on outdoor air supply/return

Refrigerant line connection

Fig. 11 - Dimensions, mm

38FZ/BZ 048

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on refrigerant line connection side

Plan view

View on outdoor air supply/return

Refrigerant line connection

Fig. 12 - Dimensions, mm

38FZ/BZ 060

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on refrigerant line connection side

Plan view

View on outdoor air supply/return

Refrigerant line connection

Fig. 13 - Dimensions, mm

38FZ/BZ 072

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on refrigerant line connection side

Plan view

View on outdoor air supply/return

Refrigerant line connection

Fig. 14 - Dimensions, mm

38FZ/BZ 084

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on refrigerant line connection side

Plan view

View on outdoor air supply/return

Refrigerant line connection

Fig. 15 - Dimensions, mm

40BZ 024

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on indoor air supply/return

Plan view

View on refrigerant line connection side

Refrigerant line connection

Fig. 16 - Dimensions, mm

40BZ 036

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

Plan view

View on refrigerant line connection side

View on indoor air supply/return

Refrigerant line connection

Fig. 17 - Dimensions, mm

40BZ 042

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

Plan view

View on indoor air supply/return

View on refrigerant line connection side

Refrigerant line connection

Fig. 18 - Dimensions, mm

40BZ 048

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on indoor air supply/return

Plan view

View on refrigerant line connection side

Refrigerant line connection

Fig. 19 - Dimensions, mm

40BZ 060

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on indoor air supply/return

View on refrigerant line connection side

Plan view

Refrigerant line connection

Fig. 20 - Dimensions, mm

40BZ 072

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on indoor air supply/return

View on refrigerant line connection side

Plan view

Refrigerant line connection

Fig. 21 - Dimensions, mm

40TZ/BZ 084

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

When designing an installation, always use up-to-date drawings, available from your local Carrier office.

Note: Standard air supply and return

View on indoor air supply/return

Plan view

View on refrigerant line connection side

Refrigerant line connection

Fig. 22 - Service area, mm

50TZ/YZ (all sizes)

A: 800 mm B: 500 mm C: 600 mm

*D: 500 mm

NOTE: * For size 50TZ/YZ 060 D = 600 mm.

Fig. 23 - Service area, mm

38FZ/BZ (all sizes)

A: 800 mm B: 500 mm C: 500 mm

Fig. 24 - Service area, mm

40TZ/BZ (all sizes)

A: 600 mm

*B: 500 mm

C: 500 mm

NOTE: * For size 40BZ 060 B = 600 mm.

Fig. 26 - Centre of gravity (approx.)

Fig. 25 - Centre of gravity (approx.)

50TZ/YZ (all sizes)

38FZ/BZ 024 036 042 048 060 072 084

XG* mm 302 310 322 348 372 460 490 YG* mm 199 211 210 212 218 283 283 ZG* mm 340 357 424 458 500 600 610

* Measured from point 

38FZ/BZ (all sizes)

Fig. 27 - Centre of gravity (approx.)

40TZ/BZ (all sizes)

40TZ/BZ 024 036 042 048 060 072 084

XG* mm 290 300 308 310 310 430 460 YG* mm 223 238 240 232 235 275 277 ZG* mm 495 586 633 682 725 758 786

* Measured from point 

50TZ/YZ 024 036 042 048 060 072 084

XG* mm 443 461 522 559 595 695 710 YG* mm 200 213 219 217 223 290 290 ZG* mm 428 438 484 519 563 667 702

* Measured from point 

Control box

Support 50YZ points 024 036 042 048 060 072 084

 20 22 26 28 33 42 49  27 31 36 49 46 57 66  18 21 20 25 28 39 47  42 47 53 61 66 76 87  50 60 62 70 74 85 96  13 15 17 21 23 33 40

Fig. 29 - Weight distribution, kg (approx.)

38FZ/BZ (all sizes)

Support 40TZ/BZ points 024 036 042 048 060 072 084

 11 12 14 15 18 25 25  17 18 19 21 25 32 34  18 20 21 22 25 25 25  12 13 17 18 19 34 36

Support 38FZ points 024 036 042 048 060 072 084

 18 22 27 32 36 43 54  15 18 20 23 27 37 48  43 50 52 65 69 77 91  34 40 41 45 48 55 68

Control box

Air Filter

Fig. 28 - Weight distribution, kg (approx.)

50TZ/YZ (all sizes)

Support 50TZ points 024 036 042 048 060 072 084

 19 21 25 28 33 41 49  27 31 36 39 46 57 65  17 20 20 24 28 39 46  42 48 52 60 65 75 86  50 59 61 69 73 84 96  13 14 17 21 22 33 40

Support 38BZ points 024 036 042 048 060 072 084

 18 23 27 33 37 44 55  16 19 20 23 27 37 49  43 51 55 66 70 78 92  34 40 41 46 49 57 69

Fig. 30 - Weight distribution, kg (approx.)

40TZ/BZ (all sizes)

Air discharge

In these units the air discharge and supply (indoor and outdoor) is factory-set as shown in Fig. 31. Alternative positions are possible, as follows (Fig. 32):

Fig. 31 - Standard air supply and discharge

Fig. 32 - Alternative air supply and discharge (except

outdoor unit model 084)

A = Alternative

NOTE: In the 50TZ/YZ 060 and 40BZ 060 units the standard indoor air discharge is through this panel.

Outdoor unit change

a) Detach discharge panel  and access panel . b) Remove the fan/motor assembly , loosening it from the

unit base and remove the duct . c) Unscrew the angle irons in the fan/motor assembly . d) Turn the fan/motor assembly  by 180° and attach the

angle irons previously removed. e) Fasten the fan/motor assembly  in its new position. f) Install the discharge panel  and the access panel  in

their new positions. g) Remove supply air panel  and access panel !. h) Exchange the position of panels  and !.

See Figs. 31 and 32.

S = Standard

NOTE: In the 50TZ/YZ 060 and 40BZ 060 units the standard indoor air discharge is through this panel.

Legend Figs. 31 and 32

1 Indoor air discharge panel 2 Access panel 3 Indoor fan/motor assembly 4 Air filter panel 5 Access panel 6 Outdoor air discharge panel 7 Access panel 8 Air discharge duct 9 Outdoor fan/motor assembly 0 Outdoor air supply panel ! Access panel

Indoor unit change

a) Detach discharge panel  and access panel . b) Remove the fan/motor assembly , loosening it from the

unit base. In sizes 50TZ/YZ 060 and 40BZ 060 remove the duct.

c) Unscrew the angle irons in the fan/motor assembly . d) Turn the fan/motor assembly  by 180° and attach the

angle irons previously removed.

e) Fasten the fan/motor assembly  in its new position. f) Install the discharge panel  and the access panel  in

their new positions.

g) Remove filter panel  and access panel . h) Exchange the position of panels  and .

See Figs. 31 and 32.

340 360 380 400 420 440 460

150

175

200

225

250

275

300

325

350

Fan performance curves

50TZ/YZ 024 indoor fan (40BZ 024)

450 475 500 525 550 575 600

240

260

280

300

320

340

360

380

50TZ/YZ 024 outdoor fan (38BZ/FZ 024)

Available static pressure, Pa

Air flow, l/s

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

100

120

475 500 525 550 575 600 625 650

300

350

400

450

500

550

600

50TZ/YZ 036 indoor fan (40BZ 036)

Available static pressure, Pa

Air flow, l/s

Power input, W

650 700 750 800 850 900

475

525

575

625

675

50TZ/YZ 036 outdoor fan (38BZ/FZ 036)

Available static pressure, Pa

Air flow, l/s

Power input, W

100

120

700 750 800 850 900 950

450

500

550

600

650

700

750

100

120

550 600 650 700 750 800

325

375

425

475

525

575

625

Available static pressure, Pa

Air flow, l/s

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

50TZ/YZ 042 indoor fan (40BZ 042)

50TZ/YZ 042 outdoor fan (38BZ/FZ 042)

100

120

550 600 650 700 750 800

350

400

450

500

550

600

650

100

120

700 750 800 850 900 950 1000

450

500

550

600

650

700

750

Available static pressure, Pa

Air flow, l/s

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

50TZ/YZ 048 outdoor fan (38BZ/FZ 048)50TZ/YZ 048 indoor fan (40BZ 048)

Fan performance curves

50TZ/YZ 084 (38BZ/FZ 084)

Curve Pulley opening Speed r/s

0 Closed 15.33

1 1 turn 14.83

2 2 turns 14.33

3 3 turns 13.83

4 4 turns 13.33

Factory setting 1 turn 14.83

Models 025 to 060

Curve Speed

1 High

2 Medium

100

120

140

160

180

200

750 800 850 900 950 1000 1050 1100

650

700

750

800

850

900

950

1000

1050

1100

1150

100

120

140

160

180

200

1100 1150 1200 1250 1300 1350 1400 1450

1000

1050

1100

1150

1200

1250

1300

1350

1400

1450

1500

100

150

200

250

1100 1200 1300 1400 1500 1600

900

950

1000

1050

1100

1150

1200

1250

1300

1350

1400

100

120

140

160

180

1300 1400 1500 1600 1700 1800

1150

1200

1250

1300

1350

1400

1450

1500

1550

1600

100

150

200

250

1100 1200 1300 1400 1500 1600

900

950

1000

1050

1100

1150

1200

1250

1300

1350

1400

100

120

140

160

1500 1600 1700 1800 1900 2000 2100 2200

900

1000

1100

1200

1300

1400

1500

1600

1700

50TZ/YZ 060 indoor fan (40BZ 060) 50TZ/YZ 060 outdoor fan (38BZ/FZ 060)

Available static pressure, Pa

Air flow, l/s

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

50TZ/YZ 072 indoor fan (40BZ 072) 50TZ/YZ 072 outdoor fan (38BZ/FZ 072)

Available static pressure, Pa

Air flow, l/s

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

50TZ/YZ 084 indoor fan (40TZ/BZ 084) 50TZ/YZ 084 outdoor fan (38BZ/FZ 084)

Available static pressure, Pa

Air flow, l/s

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components.

Only trained and qualified service personnel should install, start-up or service air conditioning equipment. Untrained personnel can perform the basic maintenance functions of cleaning and replacing filters.

All other operations should be performed by trained service personnel.

When working on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use a quenching cloth for unbrazing operations.

WARNING: Before performing service or maintenance operations on the unit, turn off the main power switch to the unit. Electrical shock could cause personal injury.

All units are designed for ducted installation (indoor and/or outdoor air discharge). If ducts are not used the installer must place a protection grille in the discharge.

Only use "Original Spare Parts" for repairs. Special attention must be paid to the correct installation of the spare parts. The parts must always be installed in their original position.

During unit operation, some of the refrigerant circuit elements could reach a temperature in excess of 70oC so only trained or qualified personnel should access areas protected by access panels.

This unit should not be installed in an explosive atmosphere.

The unit can operate in normal radioelectric atmospheres in residential, commercial and light industrial installations. For other applications, please consult Carrier.

INSTALLATION

1. Inspect shipment. Inspect the unit. If it is damaged, or if the shipment is incomplete, immediately file a claim with the shipping company.

2. Check that the local power supply agrees with the specification on the unit nameplate.

Siting the unit

Check the following points:

- The location must be able to support the unit operating weight (see Tables 1 and 2).

- Allow sufficient space for servicing and air flow around the unit (see Figs. 22, 23 and 24).

- Select a location free of dust or foreign matter which may cause coil clogging.

- When installing the unit on the ground, select a site which is not subject to flooding (outdoor units).

- Consult all applicable rules and standards which govern the installation of air conditioning equipment.

- Vibration absorbers should be provided throughout the installation to prevent noise transmission.

Rigging

1. When rigging, use spreaders to prevent damage to the panels (see Fig. 33). Avoid violent movements.

2. To prevent damage while in transit, do not remove the unit from the skid until it is at its final location.

3. Never roll or tip the unit more than 15o.

IMPORTANT: Make sure that all unit panels are fixed in place before moving. Raise and set down the unit carefully.

Fig. 33 - Rigging

IMPORTANT: The unit should be correctly levelled to avoid drainage problems.

Ductwork (indoor air discharge)

The ductwork dimensions should be determined in accordance with the air flow to be carried, and the available static pressure of the unit.

It is recommended to observe the following considerations:

- Whatever type of ductwork is used, it should not be made of materials which are flammable, or give off toxic gases in the event of a fire. The internal surfaces should be smooth, and not contaminate the air which passes through. It is recommended to use sheet metal ducts, adequately insulated to avoid condensation and thermal leakage.

- At the points where the ducts join the unit, it is recommended to use flexible connections to absorb vibrations, prevent noise inside the ductwork and allow access to the unit.

- Bends near the unit outlet should be avoided as much as possible. If unavoidable, they should be as slight as possible, and internal deflectors should be used when the duct has large dimensions.

NOTE: All duct sizing and design work should be carried out by qualified technicians.

Condensate and rainwater drainage

The units are supplied with a condensate drain pan with a drain pipe (outside diameter 23 mm). This tube leaves the factory separately wrapped so it is easy to check them.

- Take great care with the drain pipes; these must always be below the connection and be inclined to facilitate drainage (Fig. 34).

ATTENTION: Do not make any holes in the unit base, as this may perforate the condensate pan.

Fig. 34 - Drain

Voltage imbalance % =

Largest deviation from average voltage

Average voltage

Example: Nominal supply: 400-3-50

AB = 404 V BC = 399 V AC = 394 V

Average voltage = 404 + 399 + 394 = 399 400 V

Determine maximum deviation from average voltage:

AB = 404 - 400 = 4 BC = 400 - 399 = 1 AC = 400 - 394 = 6

Largest deviation is 6 volts. Percentage voltage imbalance is therefore:

6 x 100 = 1.5 % 400

CAUTION: The installer must provide line protection devices, as required by the applicable legislation.

Run the power supply cables to the main disconnect switch of the 50TZ/YZ or 38FZ/BZ unit, and install airtight cable conduits through the knockouts provided for this purpose.

Electrical connection between the units (38FZ/BZ and 40TZ/BZ)

Make the electrical connection between the 38FZ/BZ outdoor unit and the 40TZ/BZ indoor unit, using correctly sized copper cables for the power supply of the 40TZ/BZ. Refer to the wiring diagram.

Thermostat connection

Thermostat/unit connection must be via a loom (wire section 1 mm2) manufactured in accordance with the wiring diagram accompanying the unit. Follow the instructions supplied with the control for thermostat assembly and handling. The general rules below should be taken into account:

Power supply: 24 V AC

Standard connections:

R Connection to 24 V L Protection device indication C Common Y1 First stage cooling W1 First stage heating W2 Second stage heating (option) E Emergency heat (option) O Reversing valve*

* The O connection is activated in cooling.

Motor

Drain pipe OD 23 mm

Drain pan

Electrical connections

WARNING: To prevent electrical shock or equipment damage, make sure disconnects are open before electrical connections are made. If this action is not taken, personal injury may occur.

Field wiring must comply with all applicable codes.

Voltage to the unit must be within 10% of the voltage and 10% of the current indicated on the nameplate. Contact your local power company for correction of an incorrect line voltage.

Check the voltage before selecting supply wiring fuses and controls.

Take special care when making the earth connection.

WARNING: Operation of the unit on improper line voltage constitutes abuse and is not covered by the Carrier warranty.

IMPORTANT: To ensure the correct unit power supply (cable entry, conductor cross section, protection devices etc.), consult the electrical data table, the wiring diagram supplied with the unit and the applicable standards concerning the installation of air conditioning equipment.

The protective earth conductor must be slightly longer than the phases.

Never operate a unit if the voltage imbalance exceeds 10%. The following formula must be used to determine the percentage of voltage imbalance.

Unit base

Field-supplied

NOTE 1: If the thermostat wiring is incorrect, the control will be blocked (red LED on) and all the outlets will be deactivated when unit power is supplied. NOTE 2: The thermostat cable should be independent and separate from any 230 V or 400 V cable.

Refrigerant line connections (38FZ/BZ and 40TZ/BZ)

To guarantee correct unit performance ensure that the line length and number of bends are kept to a minimum. Avoid pipe kinking by using large radius bends.

IMPORTANT: Always use refrigerant-grade deoxidized and dehydrated copper tubing between the indoor and outdoor units.

Before connecting the refrigerant lines carefully follow the steps below:

- Remove the nitrogen holding charge from the refrigerant circuits.

- Select the diameter of the copper tubing according the the units installed and according to the distance between the indoor and outdoor units.

- Use silver alloy rod for soldering purposes, and ensure that this work is done in a nitrogen atmosphere.

- To avoid oxidation insulate the refrigerant lines adequately.

- Pull a vacuum in the refrigerant circuit until a pressure of

0.7 mm water column is maintained for at least 2 hours.

- Charge the refrigerant circuit with the necessary amount of R-407C refrigerant (in accordance with tables 1 and 2 and the length of the refrigerant lines).

- Check there are no refrigerant leaks.

Refrigerant line selection

General

When designing refrigerant lines the following must be kept in mind:

- Depending on the unit arrangement:

Fig. 35 - Refrigerant lines option A

Suction line:

- A siphon at the base of the vertical pipe run and intermediate siphons every 8 m or oil separators are needed.

- Most unfavourable condition: the suction speed in the vertical pipe run must be more than 6 m/s.

Fig. 36 - Refrigerant lines option B

Suction line:

- The intermediate siphon can be omitted.

- Most unfavourable condition: the suction speed in the vertical pipe run must be more than 6 m/s.

For both option A (Figure 34) and option B (Figure 35) the following conditions should be observed:

- The maximum speed permitted in any line is 15 m/s.

- Suction line must be insulated and have a 2% slope towards the compressor and the horizontal pipe run.

In long pipe runs it may be necessary to adjust the oil charge.

- If the liquid line flow is downward, it is necessary to install pressure equalizer for heights above 10 m.

- The liquid should be subcooled by at least 1 K at the restrictor inlet. In this case, if the liquid line flow is upward and the pipe is longer than 15 m, it must be subcooled by 1 K for each 3.5 m in excess of 15 m.

- For each metre of refrigerant pipe installed, refrigerant has to be added in accordance with table 5.

Table 5 - Refrigerant charge (g/m)

Diameter 3/8" 1/2" 5/8" 3/4" 7/8" 1-1/8" 1-3/8"

Liquid line 40 75 120 180 250 420 645 Suction line 6 14 23 34 47 81 123

Liquid line

Outdoor unit

Indoor unit

Cooling (suction line)

Liquid line

Outdoor unit

Indoor unit

Cooling (suction line)

Heat pump

Cooling

Heat pump (discharge)

Heat pump

Cooling

Heat pump (discharge)

Gas

Sizing

Fig. 37 - Suction line

Pressure drop/10 m eqivalent length

Fig. 38 - Discharge line

Pressure drop/10 m eqivalent length

Legend:

1 Size 024 2 Size 036 2 Size 042 3 Size 048 4 Size 060 5 Size 072 6 Size 084

From Figure 38, for the selected unit we can obtain the pressure drop corresponding to 10 m of equivalent length for each diameter.

For other equivalent lengths, the pressure drop is obtained in direct proportion. The total pressure drop for the line (sum corresponding to the vertical and horizontal pipe runs) must not be higher than 20 kPa.

Liquid line:

The liquid line diameter can be selected using table 6.

Table 6 - Liquid line

Size Total equivalent length

Up to 10 m From 10-30 m From 30-50 m

024 3/8" 3/8" 3/8" 036 3/8" 3/8" 1/2" 042 3/8" 3/8" 1/2" 048 3/8" 1/2" 1/2" 060 3/8" 5/8" 5/8" 072 5/8" 5/8" 5/8" 084 5/8" 5/8" 3/4"

Necessary checks/precautions before start-up

- Ensure that all electrical connections are properly tightened.

- Ensure that the unit is level and well-supported.

- Check the condition of the ductwork in case damage has occurred during installation.

- The air filter should be clean and in place.

- All the panels should be fitted and firmly secured with the corresponding screws.

- Make sure that there is sufficient space for servicing and maintenance purposes.

- Check the drain connections.

- Ensure that there are no refrigerant leaks.

- Confirm that the electrical power source agrees with the unit nameplate rating.

- Make sure that compressors float freely on the mounting springs.

WARNING: The compressors are mounted on vibration isolators. Do not loosen or remove the support mounting bolts.

Refrigerant charge

Gas tightness testing and dehydration

50TZ/YZ units are shipped fully charged with refrigerant R-407C ready for operation. If, when the unit is run, symptoms of loss of charge (for example, low pressure switch tripping or abnormally low cooling capacities) are detected, first conduct a leak test followed, if necessary, by a gas tightness test using compressed nitrogen. For the latter all refrigerant must be removed from the circuit. Transfer the refrigerant to a storage tank and then rinse the circuit. For your information, we are listing here some precautions that need to be taken into consideration, when working with these units.

Refrigerant guidelines for R-407C

Refrigerant R-407C consists of a non-azeotropic blend of 23% of R-32, 25% of R-125 and 52% of R-134a, and is characterised by the fact that at the time of the change in state the temperature of the liquid/vapour mixture is not constant. All checks must be pressure tests, and the appropriate pressure/ temperature ratio table must be used for the interpretation of the values.

Leak detection is especially important for units charged with refigerant R-407C. Depending on whether the leak occurs in the liquid or the vapour phase, the proportion of the different components in the mixture remaining in the unit is not the same.

SPEED (m/s)

The following basic guidelines must be observed:

• Leaks must be repaired immediately by qualified personnel.

• Refrigerant must never be discharged to the atmosphere.

• Use a refrigerant reclaim unit.

• Any loss of oil from the system during maintenance must be stopped immediately and the collected oil must by removed in accordance with applicable regulations

38FZ/BZ and 40TZ/BZ units are supplied with a nitrogen holding charge. This must be removed before soldering the connecting refrigerant lines to the unit. Once the soldering has been completed, the complete refrigerant circuit must be evacuated then the correct quantity of R-407C refrigerant for each system must be charged.

WARNING: If any brazing is to be done the refrigerant circuit must be filled with nitrogen. Combustion of refrigerant produces toxic phosgene gas.

VERY IMPORTANT:

- Never use the compressor as a vacuum pump.

- If more refrigerant is needed add gas very slowly via the suction line. Liquid refrigerant must never be introduced into the suction line.

- Do not overcharge with refrigerant.

START-UP

Actual start-up should only be done under the supervision of a qualified refrigeration mechanic.

These units incorporate the electronic Master Link II control. The operation and handling of this control is explained in the specific instructions accompanying each unit.

Initial checks

With the unit in operation, ensure that the values shown on the high and low pressure gauges are within the normal limits. It is advisable to simulate unit shutdown due to high and low pressure, in order to make sure that the pressurestats work properly. To do so, proceed as follows:

- High pressure shutdown: Completely cover the outdoor air inlet, or disconnect the outdoor fan and motor. The unit should stop at a pressure of 2844 kPa.

- Low pressure shutdown: Cover the indoor air inlet, or disconnect the indoor fan and motor. Observe the low pressure gauge. The unit should stop at a pressure of 265 kPa.

In both cases it is possible to reset the unit through the remote control as previously indicated.

Check that the motor and compressor consumptions are approximately the same as those shown on the unit nameplate. Consumption data is also given in Tables 3 and 4.

Refrigerant system description

The refrigerant circuit incorporates the following primary elements:

- Refrigerant-air heat exchanger: made of high quality

copper tubes and pretreated aluminium fins, for extra corrosion resistance and greater protection than offered by copper fins.

- Refrigerant lines: made completely of high quality

copper.

- Metering device.

- Compressors: hermetic compressors for all units, cooled by

suction gas. They incorporate internal protection.

- Filter drier and Schrader valves.

- Safety elements: high, low pressurestat.

- The packaged units are supplied with the exact refrigerant charge.

- The split-system units are supplied with a nitrogen holding charge which must be evacuated and replaced with the right refrigerant charge for the unit size and the connection lines.

Compressor replacement

When an internal fault occurs, the compressor must be replaced. This must be done as detailed below:

- Disconnect the unit from the electrical supply.

- Remove the panels.

- Remove the gas from the refrigerant circuit using recovery equipment to avoid harming the atmosphere.

- Electrically disconnect the compressor.

- Unbraze or unscrew the suction and discharge lines, taking care not to damage the rest of the components.

- Remove the fastenings from the compressor.

- Replace the compressor, ensuring that it contains sufficient oil.

- Braze or screw in the lines.

- Connect the compressor according to the wiring diagram.

- Evacuate the compressor.

- Fill the refrigerant charge indicated on the nameplate, plus the required charge for the refrigerant connection lines.

NOTE: This operation must be done by a qualified technician.

Description of unit protection devices

The unit includes the following compressor protection devices:

- Internal compressor protection device to avoid superheat.

- Short-cycle protection (included on the main electronic board).

- Outdoor fan motor thermomagnetic switch.

- High pressurestat: This protects the unit against excessive condensing pressure. The high pressurestat has factory-fixed non-adjustable settings. To check, see section Initial checks.

- Low pressurestat: This protects the unit against excessive low pressure in the evaporator. The low pressurestat has factory fixed non-adjustable settings. To check, see section Initial checks.

CAUTION: When any of these cuts out, the unit stops and will not re-start until the contacts have been reclosed after rectification of the fault.

Table 7 - Pressure switch settings

Cut-out Cut-in Reset

High pressurestat *2844 kPa *1863 kPa Automatic Low pressurestat *265 kPa *363 kPa Automatic

* Factory-calibrated

WARNING: Alteration of factory settings other than the design set-point, without manufacturer's authorisation, may void the warranty.

Operating limits

These units have been designed to operate within the following limits:

Table 8 - Cooling operation

Zone Air temperature

Dry bulb Wet bulb

Indoor

Maximum +35°C +21°C Minimum +19°C +14°C

Outdoor

Maximum +46°C Minimum +19°C* -

* With the optional head pressure control, the unit can operate with temperatures below 19°C.

Table 9 - Heating operation

Zone Air temperature

Dry bulb Wet bulb

Indoor

Maximum +27°C -

Outdoor

Maximum +24°C +18°C Minimum -15°C* -

Control sequence

The unit is started and stopped by the remote control N1. If the remote control N1 requires cooling or heating, the built-in compressor short-cycle protection starts counting 3 seconds.

After this time (if high-low pressurestats, indoor and outdoor fan thermal protectors are not tripped) the unit starts up.

OPTIONS/ACCESSORIES

- Head pressure control (option/accessory)

- Electric resistance heater (option/accessory)

- Hot water coil (option/accessory)

- Outdoor air filter (option/accessory)

- Crankcase heater (option/accessory) - only for 50TZ and 38FZ units.

GENERAL MAINTENANCE

ATTENTION: Before starting any servicing or maintenance operation on the unit, make sure that the power supply has been disconnected. A current discharge could cause personal injury.

In order to obtain maximum performance from the unit special attention should be paid to the following points:

- Electrical connections: The supply voltage should be

within the limits permitted by the compressor. Ensure that no faulty contacts exist in the terminal blocks, contactor boards, etc. Make sure that all the electrical connections are properly tightened, and that all the electrical components (contactors, relays, etc) are firmly secured to the corresponding rails.

Pay special attention to the condition of the connecting cables between the control elements and the electrical box, and to that of the unit power supply cable. They should not be twisted and there should be no slits or notches in the insulation. Check the starting and running consumptions are within the limits specified in the corresponding technical information.

- Drainage: Frequently check that the drain is not

obstructed, and that the condensate pan is clean and level.

- Inlet filter: This should be cleaned periodically. The

frequency depends on the purity of the entering air. The filter may be cleaned with a household vacuum cleaner, or by immersing it in water.

- Refrigerant circuit: Ensure that there is no leakage of

refrigerant or oil from the compressor. Check that the high and low side operating pressures are normal. Make sure that the coils are not dirty. If necessary a filter may be installed in the outdoor air inlet. Check for unusual compressor noise.

- Controls: Check the operation of all electric controls,

high and low pressurestats, etc.

SERVICE

Lubrication

Both the motors and the fans have factory lubricated and sealed bearings, and need no further lubrication.

The compressor has its own oil supply and oil should not be added unless a leak has occurred.

Servicing recommendations

- Before replacing any of the elements in the cooling circuit, ensure that the entire refrigerant charge is removed from both the high and low pressure sides of the unit.

- The control elements of the cooling system are highly sensitive. If they need to be replaced, care should be taken not to overheat them with blowlamps whilst soldering. A damp cloth should be wrapped around the component to be soldered, and the flame directed away from the component body.

- Silver alloy soldering rods should always be used.

- If the total unit gas charge has to be replaced, the quantity should be as given on the nameplate and the unit should be properly evacuated beforehand.

- During unit operation all panels should be in place, including the electrical box access panel.

- If it is necessary to cut the lines of the refrigerant circuit, tube cutters should always be used and never tools which produce burrs. All refrigerant circuit tubing should be of copper, specially made for refrigeration purposes.

Transformation to split system (50TZ/YZ)

All units can be changed from a packaged to a split system, as described below:

- Remove the compressor access panel(s) and the indoor unit access panel(s).

- Recover the complete refrigerant charge from the high

and low pressure sides of each refrigerant circuit, and then create a light vacuum to prevent possible accidents.

- From the indoor unit at the conduit drill hole remove the neoprene insulation from the suction line(s) until you find the welded joint of both line sections (approximately 70 mm from the base of the indoor unit). Similarly locate the welded joint of the liquid line sections. Separate both lines (suction and liquid lines) by unsoldering them. After completing this operation, plug the ends of both lines to avoid the possible entry of foreign matter.

- Loosen the indoor fan motor supply cable sleeve. Remove the sleeve.

- Remove the support that links the two units; there are four screws for the lower part.

- Loosen the screws and nuts that join the two sections (indoor and outdoor) inside the unit and separate them carefully, to avoid damaging the refrigerant line ends.

- Connect the refrigerant lines as described earlier in the text.

FINAL RECOMMENDATIONS

The unit you have purchased has undergone strict quality control procedures before leaving the factory.

All components, including the control systems and electrical equipment, etc., are certified by our Quality Control Department, and tested under the harshest possible operating conditions in our laboratories. However, after leaving the factory, it is possible that one or more of these elements may be damaged due to causes beyond our control. In such an event,

the user should not work on any of the internal components, or subject the unit to operating conditions which are not specified in this manual, since serious damage may result and

the guarantee would be invalidated. Repair and maintenance work should always be left to the installer.

All recommendations concerning unit installation are intended to be as a guideline. The installer should carry out the installation according to the design conditions and should comply with all applicable regulations for air conditioning and refrigeration installations.

NOTE: The manufacturer does not accept responsibility for any malfunctions resulting from misuse of the equipment.

Manufacturer: Carrier, Guadalajara, Spain Order No. 15031-20, 11.2001. Supersedes order No.: New Printed on Totally Chlorine-Free Paper. Manufacturer reserves the right to change any product specifications without notice. Printed in the Netherlands

AM-036920

TROUBLESHOOTING CHART

A list of possible faults, as well as the probable cause and suggested solutions is shown in Table 10. In the event of a unit malfunction it is recommended to disconnect the power supply and ascertain the cause.

Table 10 - Troubleshooting chart

Symptoms Cause Remedy

Unit does not start No power supply Connect power supply

Main switch open Close switch Low line voltage Check voltage and remedy the deficiency A protection has tripped Reset Contactor stuck open Replace contactor Seized compressor Replace compressor

Unit starts and stops frequently Defective compressor contactor Replace contactor

Defective compressor Replace compressor Refrigerant losses Check and add the necessary quantity

Unit continuously cuts out at COOLING CYCLE: low pressure Defective low pressurestat Replace pressurestat

Refrigerant losses Check and add the necessary quantity Indoor fan does not operate Check fan motor

Unit continuously cuts out at COOLING CYCLE: high pressure Defective high pressurestat Replace pressurestat

Blocked filter drier Replace filter Outdoor fan does not operate Check fan motor

HEATING CYCLE:

Defective high pressurestat Replace pressurestat Indoor fan does not operate Check fan motor

Abnormal system noise Piping vibration Support piping

Noisy compressor Check and change if necessary Badly fitting panels Install correctly

Compressor loses oil Leak in system Repair leak

Water loss Defective drainage connections Check and tighten if necessary

Carrier 50TZ user guide manual

Specifications and Main Features

Frequently Asked Questions

User Manual