Carrier 40BZ user guide manual

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

Single-Package Cooling Units
and Heat Pumps

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

Installation, operation and maintenance instructions

1

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

2

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: .

Nominal voltage:

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

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

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

Control circuit voltage:

Main circuit breaker rating:

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

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

PHYSICAL DATA:

Outdoor unit : Indoor unit :

Entering air temp.:

Leaving air temp.:

Pressure drop (air):

Discharge air pressure:

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

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

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

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

Fan motor input: Ph. 1:

Ph. 2:

Ph. 3:

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

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

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

o

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

o

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

SAFETY DEVICE SETTING 38TA UNIT:

High pressure switch: cut-out:

Low pressure switch: cut-out:

Step controller: cut-out 1st step:

cut-out 2nd step:

Oil level:

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

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

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

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

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

o

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

o

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

o

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

ACCESSORIES

Commissioning engineer (name):

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

Customer agreement

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

Name:

Remarks:

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

C

3

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
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
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

2

0.20 0.30 0.35 0.39 0.41 0.61 0.61

2

0.31 0.38 0.45 0.53 0.60 0.70 0.76

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
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
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

2

0.20 0.30 0.35 0.39 0.41 0.61 0.61

2

0.31 0.38 0.45 0.53 0.60 0.70 0.76

* 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.

4

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

* 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 a dewpoint suction temperature of 7°C.
*** Based on an outdoor air dry bulb temperature of 46°C and a dewpoint suction temperature of 12°C.

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.

5

50TZ/YZ 024

Fig. 1 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

6

50TZ/YZ 036

Fig. 2 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

7

50TZ/YZ 042

Fig. 3 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

8

50TZ/YZ 048

Fig. 4 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

9

50TZ/YZ 060

Fig. 5 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

10

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

50TZ/YZ 072

Fig. 6 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

11

50TZ/YZ 084

Fig. 7 - Dimensions, mm

View on indoor air supply/return

Evaporator access panel

Compressor access panel

Control box access panel

Evaporator air inlet

Evaporator air outlet

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

12

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

38FZ/BZ 024

Fig. 8 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

13

38FZ/BZ 036

Fig. 9 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

14

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

38FZ/BZ 042

Fig. 10 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

15

38FZ/BZ 048

Fig. 11 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

16

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

38FZ/BZ 060

Fig. 12 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

17

38FZ/BZ 072

Fig. 13 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

18

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

38FZ/BZ 084

Fig. 14 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Control box access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on outdoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Main disconnect switch

Note: Standard air supply and return

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

19

40BZ 024

Fig. 15 - Dimensions, mm

View on refrigerant line connection side

Refrigerant line connection

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Plan view

View on indoor air supply/return

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

20

Note: Standard air supply and return

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

40BZ 036

Fig. 16 - Dimensions, mm

View on indoor air supply/return

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Refrigerant line connection

Plan view

View on refrigerant line connection side

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Note: Standard air supply and return

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

21

40BZ 042

Fig. 17 - Dimensions, mm

View on indoor air supply/return

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Refrigerant line connection

Plan view

View on refrigerant line connection side

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

22

Note: Standard air supply and return

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

40BZ 048

Fig. 18 - Dimensions, mm

View on indoor air supply/return

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Refrigerant line connection

Plan view

View on refrigerant line connection side

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Note: Standard air supply and return

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

23

40BZ 060

Fig. 19 - Dimensions, mm

View on indoor air supply/return

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Refrigerant line connection

Plan view

View on refrigerant line connection side

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

24

Note: Standard air supply and return

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

40BZ 072

Fig. 20 - Dimensions, mm

View on indoor air supply/return

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Refrigerant line connection

Plan view

View on refrigerant line connection side

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

Note: Standard air supply and return

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

25

40TZ/BZ 084

Fig. 21 - Dimensions, mm

View on indoor air supply/return

Compressor access panel

Suction line ø 5/8"

Liquid line ø 3/8"

Condenser air inlet

Refrigerant line connection

Plan view

View on refrigerant line connection side

Condenser air outlet

Drain, 3/4" MPT

Unit supports

Cable entry

26

Note: Standard air supply and return

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

50TZ/YZ (all sizes)

Fig. 22 - Service area, mm

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

*D: 500 mm

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

38FZ/BZ (all sizes)

40TZ/BZ (all sizes)

Fig. 23 - Service area, mm

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

Fig. 24 - Service area, mm

A: 600 mm

*B: 500 mm

C: 500 mm

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

27

50TZ/YZ (all sizes)

38FZ/BZ (all sizes)

Fig. 25 - Centre of gravity (approx.)

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 

Fig. 26 - Centre of gravity (approx.)

40TZ/BZ (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 

Fig. 27 - Centre of gravity (approx.)

28

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 (all sizes)

Control box

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

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 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

38FZ/BZ (all sizes)

Control box

40TZ/BZ (all sizes)

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

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

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.)

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

Air Filter

 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

29

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

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 .

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.

See Figs. 31 and 32.

30

Fan performance curves

50TZ/YZ024 ventilador exterior (38BZ/FZ024)

0

10

20

30

40

50

60

70

450 475 500 525 550 575 600

Caudal de aire, l/s

240

260

280

300

320

340

360

380

Consumo, W

Presión estática disponible, Pa

1

1

2

2

50TZ/YZ036 ventilador exterior (38BZ/FZ036)

0

10

20

30

40

50

60

70

80

90

650 700 750 800 850 900

Caudal de aire, l/s

475

525

575

625

675

Consumo, W

Presión estática disponible, Pa

1

2

2

1

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

50TZ/YZ024 ventilador interior (40BZ024)

80

1

70

2

60

50

40

30

20

Available static pressure, Pa

10

Presión estática disponible, Pa

0

340 360 380 400 420 440 460

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

50TZ/YZ036 ventilador interior (40BZ036)

120

100

80

60

40

20

Available static pressure, Pa

Presión estática disponible, Pa

0

475 500 525 550 575 600 625 650

3

Caudal de aire, l/s

Air flow, l/s

Caudal de aire, l/s

Air flow, l/s

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

350

325

1

300

275

2

250

3

225

Consumo, W

200

175

150

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

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

600

550

500

450

400

350

300

Consumo, W

Power input, W

Available static pressure, Pa

Air flow, l/s

Power input, W

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

50TZ/YZ042 ventilador interior (40BZ042)

120

100

1

80

2

60

40

3

20

Available static pressure, Pa

Presión estática disponible, Pa

0

550 600 650 700 750 800

Caudal de aire, l/s

Air flow, l/s

50TZ/YZ048 ventilador interior (40BZ048)

120

1

100

80

2

60

40

3

20

Available static pressure, Pa

Presión estática disponible, Pa

0

550 600 650 700 750 800

Caudal de aire, l/s

Air flow, l/s

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

50TZ/YZ042 ventilador exterior (38BZ/FZ042)

625

1

575

2

525

3

475

425

Power input, W

Consumo, W

375

325

650

1

600

550

2

500

3

450

Power input, W

Consumo, W

400

350

120

100

1

80

60

2

40

20

Available static pressure, Pa

Presión estática disponible, Pa

0

700 750 800 850 900 950

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

50TZ/YZ048 ventilador exterior (38BZ/FZ048)

120

1

100

80

2

60

40

1

20

Available static pressure, Pa

2

Presión estática disponible, Pa

0

700 750 800 850 900 950 1000

Caudal de aire, l/s

Air flow, l/s

Caudal de aire, l/s

Air flow, l/s

1

2

750

700

650

600

550

500

450

750

700

650

600

Consumo, W

550

Power input, W

500

450

31

Power input, W

Consumo, W

Fan performance curves

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

50TZ/YZ060 ventilador interior (40BZ060)

200

1

180

160

2

140

120

3

100

80

60

40

Available static pressure, Pa

20

Presión estática disponible, Pa

0

750 800 850 900 950 1000 1050 1100

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

50TZ/YZ072 ventilador interior (40BZ072)

250

200

150

100

50

Available static pressure, Pa

Presión estática disponible, Pa

0

1100 1200 1300 1400 1500 1600

Air flow, l/s

Caudal de aire, l/s

Caudal de aire, l/s

Air flow, l/s

1150

1100

1

1050

2

1000

3

950

900

850

800

750

700

650

1400

1350

1300

1250

1200

1150

1100

1050

1000

950

900

50TZ/YZ060 ventilador exterior (38BZ/FZ060)

200

180

1

160

Power input, W

Consumo, W

140

120

100

2

80

60

40

Available static pressure, Pa

20

Presión estática disponible, Pa

0

1100 1150 1200 1250 1300 1350 1400 1450

Caudal de aire, l/s

1

2

Air flow, l/s

50TZ/YZ072 ventilador exterior (38BZ/FZ072)

180

160

140

120

100

80

Power input, W

Consumo, W

60

40

Available static pressure, Pa

20

Presión estática disponible, Pa

0

1300 1400 1500 1600 1700 1800

Air flow, l/s

Caudal de aire, l/s

1500

1450

1400

1350

1300

1250

1200

1150

1100

1050

1000

1600

1550

1500

1450

1400

1350

1300

1250

1200

1150

Power input, W

Consumo, W

Power input, W

Consumo, W

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

50TZ/YZ084 ventilador interior (40TZ/BZ084)

250

200

150

100

Available static pressure, Pa

50

Presión estática disponible, Pa

0

1100 1200 1300 1400 1500 1600

Models 025 to 060

Curve Speed

1 High

2 Medium

Air flow, l/s

Caudal de aire, l/s

1400

1350

1300

1250

1200

1150

1100

1050

1000

950

900

50TZ/YZ084 ventilador exterior (38BZ/FZ084)

160

140

120

100

80

Power input, W

Consumo, W

60

40

Available static pressure, Pa

20

Presión estática disponible, Pa

0

1500 1600 1700 1800 1900 2000 2100 2200

4

Caudal de aire, l/s

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

Air flow, l/s

0

1

2

3

3

4

0

1

2

1700

1600

1500

1400

1300

1200

1100

1000

900

Consumo, W

Power input, W

32

SAFETY CONSIDERATIONS

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

- 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.

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.

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

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).

Rigging hook

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.

33

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

Drain pipe OD 23 mm

Drain pan

Voltage imbalance % =

Largest deviation from average voltage

Average voltage

Example: Nominal supply: 400-3-50

ABC

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

Motor

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

3

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:

Unit base

Field-supplied

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.

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*

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

34

* The O connection is activated in cooling.

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.

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.

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

Fig. 36 - Refrigerant lines option B

Indoor unit

Heat pump
(discharge)

Heat pump

Liquid line

Cooling

Gas

Cooling
(suction line)

Outdoor unit

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.

Indoor unit

Heat pump
(discharge)

Cooling
(suction line)

Heat pump

Liquid line

Cooling

Outdoor unit

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

35

Sizing

Fig. 37 - Suction line

SPEED (m/s)

Pressure drop/10 m eqivalent length

Fig. 38 - Discharge line

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.

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.

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.

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.

36

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.

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.

37

GENERAL MAINTENANCE

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°C­Minimum +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* -

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.

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.

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.

38

Servicing recommendations

FINAL 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.

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.

39

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

40

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

Manufacturer: Carrier, Guadalajara, Spain

AM-036920