Carrier 38VTA040 Dimensions and installation guide

INSTALLATION, START-UP AND

SERVICE INSTRUCTIONS 38VTA

50Hz

AIR-COOLED CONDENSING UNIT

CONTENTS

Safety Considerations 1

Dimensional Drawing 2

Specifications 3

Installation 4

Refrigerant Piping 4

Filter Drier 5

Piping Insulation 5

Complete Electrical Connections 5

Schematic Wiring Diagram 6

Start-Up 7

Refrigerant Charging 7

Service and maintenance 8

Superheat Charging Table 9

Trouble-Shooting Guide 10

FIG. 1 38VTA040/050/060

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, repair or service air conditioning equipment.

Observe precautions in the literature, tags and labels

attached to the unit and other safety codes.

Wear safety glasses and gloves. Use quenching cloth and

have fire extinguisher available for all brazing operations.

RECEIVING

38VTA condensing units (Fig.1) are shipped individually

packed in carton boxes. When cartons are individually off

loaded from truck, do not roll, nor throw, or drop the

carton, to avoid damages to the content. Store boxes

upright as the symbols or the boxes indicate. Do not stack

units more than 2 high.

INSPECTION

Check the shipment against shipping list and remove unit

from the carton and take off protective covering. If the unit

has been damaged, file claim with transportation company

and notify Carrier immediately.

PROTECTION

Protect unit from damage caused by job site debris. Do

not allow dust, debris and water get into the unit. These

will damage unit’s component and unit’s performance will

be affected.

WARNING

Before installing or servicing system always turn off main

power supply. There may be more than one disconnect

switch. Electrical shock can cause personal injury.

A United Technologies Company

Carrier

International

Sdn. Bhd.

Malaysia

FIG. 2 38VTA040/050/060 DIMENSIONAL DRAWING

TABLE 1 SPECIFICATIONS

RLA : Rated Load Amps FLA : Full Load Amps LRA : Locked Rotor Amps

Notes : 1) MCA values are used for sizing the field supplied wires.

2) MOCP values are used for sizing the field supplied standard fuses or circuit breakers.

MODEL 38VTA

040 050 060

OPERATING WEIGHT kg 86 96 98

REFRIGERANT Type R-22

Factory Charged kg 1.0

COMPRESSORS Type Scroll

Oil charged (l) 1.36 1.95 1.77

LRA 50.0 65.5 74.0

RLA 7.9 10.0 10.0

Power Supply 400-3-50

CONDENSER FAN Type Propeller

Number 1

Blade dia. (mm) 609

Speed (rpm) 710

Drive Direct Drive

FAN MOTOR Type Permanent Split Capacitor

Power Supply 230-1-50

FLA 1.46

CONDENSER COIL Rows - fins/m 2 - 591

Face area (m2)1.14

CONNECTIONS Type Flare

Liquid, (mm) 9.50

Suction, (mm) 19.05

POWER SOURCE (V-Ph-Hz) Nominal 400 - 3 - 50

ABSOLUTE MIN - MAX VOLTAGE (V) 360-440

MINIMUM CIRCUIT AMPS (MCA) 11.0 14.0 14.0

MAXIMUM OVERCURRENT PROTECTION (MOCP) 20 25 25

FIG. 4 WALL MOUNTINGFIG. 3 GROUNDING MOUNTING

MODEL PIPING LENGTH (ONE WAY)

38VTA 5m 10m 15m 20m 25m

040 0% 1.6% 2.6% 3.6% 4.6%

050 0% 2.2% 3.8% 5.2% 6.6%

060 0% 3.0% 5.0% 6.9% 8.8%

INSTALLATION

SELECTION OF MOUNTING POSITION

1) The unit should be installed outdoors.

2) A place where air will not be stagnant.

3) A place where the exhausted air will not be sucked in

for the second time.

4) Allow sufficient space for airflow clearance, wiring,

refrigerant piping and servicing unit. See Fig. 2.

5) Avoid positioning unit in such a manner that water will

pour directly onto the unit.

6) Do not install the unit near a source of heat, steam or

flammable gas.

7) Ducting of the fan inlet or discharge is not permitted.

UNIT MOUNTING

1) MOUNTING ON GROUND - Mount on a solid, level

concrete base. If conditions or local building codes require

unit to be fastened to base, tie down bolts should be used

and fastened through slots provided in unit’s mounting

feet. (Fig. 3). Do not install unit directly on ground.

2) MOUNTING ON AND AGAINST THE WALL - The

bracket is to be locally procured (Fig.4).

3) MOUNTING ON ROOF - Mount on a level platform or

frame. When multiple unit are installed, the air outlet side

should be opened as shown in Fig. 5.

When installation base is used, secure the required

spacing as per (Fig.6). Manufacture the stand so that it will

have sufficient strength.

FIG. 5 ROOF MOUNTING

FIG. 6 MINIMUM SPACING REQUIREMENT

REFRIGERANT PIPING

Size Refrigerant Lines. Consider length of piping required

between condensing unit and evaporator, amount of liquid

lift and compressor oil return (Table 3).

Run refrigerant tubes as directly as possible, avoiding

unnecessary turns and bends. Condensing unit may be

connected to evaporator sections using field-supplied

tubing of refrigerant grade, correct size and condition.

Suspend refrigerant tubes so they do not transmit vibration

to structure. Also when passing refrigerant tubes through

walls, seal opening so vibration is not transmitted to

structure. Leave some slack in refrigerant tubes between

structure and unit to absorb vibration.

The longer the piping, the lower the cooling capacity of the

unit. See table 2.

TABLE 2 - REDUCTION IN CAPACITY VS INCREASE IN

PIPE LENGTH

As such the following are the operating limits. Refer to

Table 3 and fig. 7.

TABLE 3 - VERTICAL AND HORIZONTAL

SEPARATION BETWEEN INDOOR AND

OUTDOOR UNIT

LIQUID LINE

Note: 1) Values shown are for units operating at 7.20C saturated suction

and 350C entering air.

2) Values in ( ) indicate a case when the outdoor unit is located at a

lower height than the indoor unit.

FIG 7 MAXIMUM ALLOWABLE PIPING LENGTH

AND ELEVATION DIFFERENCE

Do not bury any section of line set underground. If any

section is buried, refrigerant may migrate to cooler buried

section during extended periods of unit shutdown. This

causes refrigerant slugging and possible compressor

damage at start-up.

If either refrigerant tubing or indoor coil is exposed to

atmospheric conditions for longer than 5 minutes, it must

be evacuated to 1000 microns to eliminate contamination

and moisture in the system.

If these instructions are not observed, the air

conditioner performance and reliability will be affected

and warranty will be void!

MAX. ALLOWABLE

PRESSURE DROP

(kPa)

MAX. ALLOWABLE

TEMPERATURE

LOSS (0C)

MAX.

HEIGHT,

H(m)

MODEL

38VTA MAX.

LENGTH,

L(m)

040

050 7 25 151 5

060

FILTER DRIER

Filter drier is field supplied and must be field installed.

Warranty will be void if filter drier is not field installed.

PIPING CONNECTIONS

Complete all installation and piping work required for indoor

and outdoor units. If brazing is required pass nitrogen or other

inert gas through piping to prevent formation of copper oxide.

Unit contains R-22 holding charge do not open Schreader

valve at this time. Leak test field piping by pressure

method. Use R-22 at approximately 170kPa backed up

with dry nitrogen to a total pressure not to exceed 1690kPa.

PIPING INSULATION

No refrigerant control device is shipped with the unit. It is

to be field supplied & installed or check with the indoor

unit. Insulate suction line adequately (Fig. 8).

CONTROL CIRCUIT WIRING

Refer to wiring diagram for field supplied wiring details.

See fig. 10 & 11.

Note:- Operation of unit on improper line voltage

constitutes abuse and could affect Carrier Warranty. Do

not install unit in system where voltage may fluctuate

above or below permissible limits.

FIG. 9 POWER WIRES TO THE SIDE OF UNIT

FIG. 8 PIPING INSULATION

COMPLETE ELECTRICAL CONNECTIONS

CAUTION

THE CONTROL VOLTAGE FROM THE FAN COIL

UNIT MUST BE OF 230V. DO NOT CONNECT THE

POWER SUPPLY TO THE SIGNAL.

POWER - Unit is factory wired for voltage shown on name

plate. Provide adequate fused disconnect switch within sight

of unit, readily accessible, but out of reach of children.

Provision for locking switch open (off) is advisable to prevent

power from being turned on while unit is being serviced.

Route power wires through opening in unit side panel and

connect in unit control box (Fig. 9). Unit must be grounded.

VERY IMPORTANT!!

•Make ground connection prior to any other electrical

connection.

• Ensure the ground cable is 20mm longer than others.

•Do not bypass or vary the protective device setting,

since unit damage may result and the guarantee

would be invalidated.

•The installer should place protection elements in the

line according to the legislation in force.

•All field electrical connection are the responsibility of

the installer.

BRING LINE POWER LEADS INTO UNIT

•All units leave the factory with complete internal wiring.

For connection to the mains power supply use wires,

fuses and a switch of the appropriate section and

amperage.

• Field wiring must comply with valid codes.

•The mains supply connection cable must be H05RN-F

type (or higher) synthetic rubber insulation with

Neoprene coating accroding to EN60335-2-40.

•Voltage to unit must be within voltage range as indicate

on nameplate.

Contact your local power supply company for correction of

an incorrect line voltage.

ELECTRICAL INTERCONNECTION BETWEEN UNITS

Electrically interconnect the condensing unit and the

indoor unit using wires of a section appropriate to the

indoor unit consumptions consults the wiring diagram.

IMPORTANT!!

•Make sure the main electrical connection for the

assembly via the outdoor unit. Consult the wiring

diagram sent together with the unit.

•Make electrical connection between units prior to

proceeding to mains supply unit connection.

•To ensure the correct unit power supply (cable entry,

conductor cross section, protective 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.

WARNING !!!

TO PREVENT ELECTRICAL SHOCK OR EQUIPMENT

DAMAGE, MAKE SURE DISCONNECTS ARE OPEN

BEFORE ELECTRICAL CONNECTION ARE MADE.

IF THIS ACTION IS NOT TAKEN, PERSONAL

INJURY MAY OCCUR.

WARNING !!!

OPERATION OF THE UNIT ON IMPROPER LINE

VOLTAGE CONSTITUTES ABUSE AND IS NOT

COVERED BY CARRIER WARRANTY!!

SCHEMATIC WIRING DIAGRAM

FIG. 10 38VTA040/050/060 c/w 40LX040/050/060

FIG. 11 38VTA040/050/060 c/w 42AR/ARM 036/048/060

38VTA040/050/060 c/w 42GX 040/050/060

START-UP

PRELIMINARY CHECKS:

1) Check that all internal wiring connections are tight and

all barriers, covers and panels are in place.

2) Field electrical power source must agree with unit

name plate rating.

3) All service valves must be opened.

INITIAL CHARGE

1. Have charging manifold and refrigerant bottle properly

connected to Schrader valve.

2. Add charge to approximately 448kPa back pressure.

This is not full charge, but it is enough to start the system.

START SYSTEM

1. Check that field disconnect is closed.

2. Set room thermostat to below room temperature, and

unit compressor will start after 5 minutes delay.

3. Check back pressure when compressor runs. Add

charge to keep back pressure at approximately 448kPa.

AIR PURGE

Air does not function as refrigerant because it cannot be

condensed in the condenser. Air and moisture remaining

in the system have undesirable effects. Therefore, they

must be purged out completely.

AIR PURGING PROCEDURE

1.) Remove the blind caps of the three-way valves.

2.) Loosen the valve stem of the three-way liquid valve by

90°for 5 seconds with a hex key wrench, then close

the valve stem quickly.

3.) Push the valve core of the three-way suction valve.

4.) Stop pushing as soon as the hissing stop.

5.) Open the three-way liquid valve for about 3 seconds,

then close quickly to check for gas leak.

6.) After checking for gas leak, open both three-way

valves all the way.

7.) Re-install the blind caps.

FIG. 12 SERVICES VALVE

CAUTION

STEM VALVE MUST BE FULLY SEATED TO CLOSE SERVICE

PORT. THERE IS NO SCHRADER VALVE AT THE SERVICE

PORT AND FAILURE TO BACKSEAT THE VALVE COULD

RESULT IN LOSS OF SYSTEM CHARGE

OR PERSONAL INJURY.

REFRIGERANT CHARGING

CAUTION

TO PREVENT PERSONAL INJURY, WEAR SAFETY

GLASSES AND GLOVES WHEN HANDLING

REFRIGERANT. DO NOT OVERCHARGE SYSTEM.

THIS CAN CAUSE COMPRESSOR FAILURE.

IMPORTANT

For accurate system performance, charge by superheat

method as shown in Tables 4 and 5.

To check and adjust charge, follow the following procedures:-

1) Operate unit for a minimum of 15 minutes before

checking charge.

2) Measure suction pressure by attaching a gauge to

suction valve service port.

3) Measure suction line temperature by attaching a service

thermometer to unit suction line near suction valve.

Insulate thermometer for accurate readings.

4) Measure outdoor coil air inlet dry-bulb temperature

with a second thermometer.

5) Measure indoor coil air inlet wet-bulb temperature

with a sling psychrometer.

6) Refer to Table 4. Find air temperature entering outdoor

coil & wet-bulb temperature entering

indoor coil. At this intersection, note the superheat.

7) Refer to Table 5. Find superheat temperature and

suction pressure, note suction line temperature.

8) If unit has higher suction line temperature than charted

temperature add refrigerant until charted temperature

is reached.

9) If unit has lower suction line temperature than charted

temperature, bleed refrigerant until charted temperature

is reached.

10) If air temperature entering outdoor coil or pressure

at suction line changes, charge to new suction line

temperature indicated on chart.

11) This procedure is valid independent of indoor air quantity.

CLEANING COIL - Coil should be washed out with water

or blow out with compressed air. The draw thru design

causes dirt and debris to build up on the outside of the

coils. Clean coil as follows:-

1) Turn off unit power.

2) Using a water hose or other suitable equipment, flush

coil from the inside to remove dirt. (See Fig. 13). Be

sure to flush all dirt and debris from drain holes in base

of unit. Fan motor is water proof.

Clean coil annually or as required. Fins are not continuous

through coil sections. Dirt and debris may pass between the

row of fins and become trapped between the row of fins and

restrict condenser air flow. Use a flashlight to determine if

dirt or debris has collected between coil section.

LUBRICATION - Fan Motor is permanently sealed lubricated

bearings. Do not oil. Compressor is supplied charged with

oil. Replace oil when lost. See Table 1 for oil recharge.

FAN ADJUSTMENT - Shut off main power supply. Remove

condenser fan grille, and loosen fan hub setscrews. Adjust

fan depth as shown in Fig. 14. Tighten setscrew and

replace fan grille.

FIG. 13 CLEANING COIL WITH WATER

FIG. 14 FAN POSITION MOUNTING

SERVICE AND MAINTENANCE

CAUTION

BEFORE PERFORMING RECOMMENDED

MAINTENANCE AND SERVICE, BE SURE UNIT MAIN

POWER SWITCH IS TURNED OFF. FAILURE TO DO

SO MAY RESULT IN ELECTRIC SHOCK OR INJURY

FROM ROTATING FAN BLADE.

CAUTION

To prevent compressor damage or personal injury,

observe the followings:.

-DO NOT overcharge system with refrigerant

-DO NOT operate unit in a vacuum or at

negative pressure

-Dome temperature may be hot

-In 3-phase application, incorrect phasing will

cause reverse rotation, resulting in elevated

noise levels, equalized pressure and reduced

current draw. Correct by reversing power

connection L1 and L2 on contactor.

For continued high performance and to minimize possible

equipment failure, periodic maintenance MUST BE

performed on this equipment.

Leave User’s Manual with owner. Explain system

operation and periodic maintenance requirements outlined

in the manual. Frequency of maintenance may vary

depending on geographic areas, such as coastal

applications which require more frequent maintenance.

TABLE 4

SUPERHEAT CHARGING TABLE

(SUPERHEAT ENTERING SUCTION SERVICE VALVE)

OUTDOOR INDOOR COIL ENTERING AIR (

F) WET_BULB

TEMP (

50 52 54 56 58 60 62 64 66 68 70 72 74 76

55 9 12 14 1720232629323537404245

60 7 10 12 1518212427303335384043

65 - 6 10 13 16 19 21 24 27 30 33 36 38 41

70 - - 7 10 13 161921242730333639

75 - - - 6 9 12 1518212428313437

80 - - - - 5 8 12 15 18 21 26 28 31 35

85 - - ----811151922263033

90 - - - - - - 5 9 13 16 20 24 27 31

95 - - - - - - - 6 10 14 18 22 25 29

100 - - ------81215202327

105 - - - - - - - - 5 9 13 17 22 26

110 - - -------611 15 20 25

115 - - --------8141823

- DO NOT ATTEMPT TO CHARGE SYSTEM UNDER THESE CONDITIONS

OR REFRIGERANT SLUGGING MAY OCCUR.

OUTDOOR INDOOR COIL ENTERING AIR (

C) WET-BULB

TEMP(0C)

10 11.1. 12.2 13.3 14.4 15.6 16.7 17.8 18.9 20 21.1 22.2 23.3 24.4

12.8 5 6.7 7.8 9.4 11.1 12.8 14.4 16.1 17.8 19.4 20.6 22.2 23.3 25

15.5 3.9 5.6 6.7 8.3 10 11.7 13.3 15 16.7 18.3 19.4 21.1 22.2 23.9

18.3 - 3.3 5.8 7.2 8.9 10.6 11.7 13.3 15 16.7 18.3 20 21.1 22.8

21.1 - - 3.9 5.6 7.2 8.9 10.6 11.7 13.3 15 16.7 18.3 20 21.7

23.9 - - - 3.3 5 6.7 8.3 10 11.7 13.3 15.6 17.2 18.9 20.6

26.7 - - - - 2.8 4.4 6.7 8.3 10 11.7 13.9 15.6 17.2 19.4

29.4 - - - - - - 4.4 6.1 8.3 10.6 12.2 14.4 16.7 18.3

32.2 - - - - - - 2.8 5 7.2 8.9 11.1 13.3 15 17.2

36.0 - - - - - - - 4.4 5.6 7.8 10 12.2 13.9 16.1

37.8 - - - - - - - - 3.3 6.7 8.3 11.1 12.8 15

40.6 - - - - - - - - 2.8 5 7.2 9.4 12.2 14.4

43.3 - - - - - - - - - 3.3 6.1 8.3 11.1 13.9

46.1 - - - - - - - - - - 4.4 7.8 10 12.8

SUPERHEAT CHARGING TABLE

(SUPERHEAT ENTERING SUCTION SERVICE VALVE)

- DO NOT ATTEMPT TO CHARGE SYSTEM UNDER THESE CONDITIONS

OR REFRIGERANT SLUGGING MAY OCCUR.

TABLE 5

SUPERHEAT SUCTION PRESSURE AT SERVICE PORT (psig)

TEMP (

61.5 64.2 67.1 70 73 76 79.2 82.4 85.7

0353739414345 474951

2373941434547 495153

4394143454749 515355

6414345474951 535557

8434547495153 555759

10 45 47 49 51 53 55 57 59 61

12 47 49 51 53 55 57 59 61 63

14 49 51 53 55 57 59 61 63 65

16 51 53 55 57 59 61 63 65 67

18 53 55 57 59 61 63 65 67 69

20 55 57 59 61 63 65 67 69 71

22 57 59 61 63 65 67 69 71 73

24 59 61 63 65 67 69 71 73 75

26 61 63 65 67 68 71 73 75 77

28 63 65 67 69 71 73 75 77 79

30 65 67 69 71 73 75 77 79 81

32 67 69 71 73 75 77 79 81 83

34 69 71 73 75 77 79 81 83 85

36 71 73 75 77 79 81 83 85 87

38 73 75 77 79 81 83 85 87 89

40 75 77 79 81 83 85 87 89 91

Required Suction Tube Temperature (0F)

(Entering Suction Service Valve)

Required Suction Tube Temperature (0C)

(Entering Suction Service Valve)

SUPERHEAT SUCTION PRESSURE AT SERVICE PORT (KPaG)

TEMP (

424 443 463 483 503 524 546 568 591

01.7 2.8 3.9 5 6.1 7.2 8.3 9.4 10.6

1.1 2.8 3.9 5 6.1 7.2 8.3 9.4 10.6 11.7

2.2 3.9 5 6.1 7.2 8.3 9.4 10.6 11.7 12.8

3.3 5 6.1 7.2 8.3 9.4 10.6 11.7 12.8 13.9

4.4 6.1 7.2 8.3 9.4 10.6 11.7 12.8 13.9 15

5.6 7.2 8.3 9.4 10.6 11.7 12.8 13.9 15 16.1

6.7 8.3 9.4 10.6 11.7 12.8 13.9 15 16.1 17.2

7.8 9.4 10.6 11.7 12.8 13.9 15 16.1 17.2 18.3

8.9 10.6 11.7 12.8 13.9 15 16.1 17.2 18.3 19.4

10.0 11.7 12.8 13.9 15 16.1 17.2 18.3 19.4 20.6

11.1 12.8 13.9 15 16.1 17.2 18.3 19.4 20.6 21.7

12.2 13.9 15 16.1 17.2 18.3 19.4 20.6 21.7 22.8

13.3 15 16.1 17.2 18.3 19.4 20.6 21.7 22.8 23.9

14.4 16.1 17.2 18.3 19.4 20.6 21.7 22.8 23.9 25

15.6 17.2 18.3 19.4 20.6 21.7 22.8 23.9 25 26.1

16.7 18.3 19.4 20.6 21.7 22.8 23.9 25 26.1 27.2

17.8 19.4 20.6 21.7 22.8 23.9 25 26.1 27.2 28.3

18.9 20.6 21.7 22.8 23.9 25 26.1 27.2 28.3 29.4

20.0 21.7 22.8 23.9 25 26.1 27.2 28.3 29.4 30.6

21.2 22.8 23.9 25 26.1 27.2 28.3 29.4 30.6 31.7

22.2 23.9 25 26.1 27.2 28.3 29.4 30.6 31.7 32.8

TROUBLE-SHOOTING CHART - COOLING CYCLE

NO COOLING OR IN-

SUFFICIENT COOLING

COMPRESSOR RUNS

BUT CYCLES ON

INTERNAL OVERLOAD

COMPRESSOR

WILL NOT RUN

CONTACTOR OPEN

COMPRESSOR POWER

SUPPLY OPEN

CONTACTOR CLOSED

LOOSE LEADS

AT COMPRESSOR

OPEN SHORTED OR

GROUNDED COMPRESSOR

MOTOR WINDINGS

COMPRESSOR

INTERNAL

PROTECTION OPEN

COMPRESSOR STUCK

RESTRICTED

DISCHARGE LINE

OUTDOOR FAN

STOPPED OR CYCLING

ON OVERLOAD

OUTDOOR AIR

RESTRICTED OR

RECIRCULATING

OVERCHARGE OR

NONCONDENSABLES

IN SYSTEM

LINE VOLTAGE

TOO HIGH OR LOW

COMPRESSOR

BEARINGS

LOW REFRIGERANT

CHARGE

HIGH SUPERHEAT

LOOSE LEAD AT

FAN MOTOR

MOTOR DEFECTIVE

INCORRECT

OUTDOOR FAN MOTOR

CAPACITOR

LOW SUCTION

PRESSURE

DIRTY AIR FILTERS

DUCT RESTRICTED

DAMPERS PARTLY

CLOSED

INDOOR COIL

FROSTED

SLIGHTLY LOW OR

REFRIGERANT

LIQUID LINE SLIGHTLY

RESTRICTED

METERING DEVICE

RESTRICTED

INCORRECT

METERING DEVICE

INDOOR COIL

STRAINER RESTRICTED

COMPRESSOR RUNS

BUT INSUFFICIENT

COOLING

HIGH SUCTION

LOW HEAD PRESSURE

DEFECTIVE

COMPRESSOR VALVES

INTERNAL PRESSURE

RELIEF OPEN

HIGH SUCTION

LOW SUPERHEAT

INCORRECT

METERING DEVICE

UNIT OVERCHARGED

FAULTY POWER

SUPPLY

OPEN CONTROL

CIRCUIT

CONTACTOR OR

COIL DEFECTIVE

LOOSE ELECTRICAL

CONNECTION

INTERNAL

OVERLOAD OPEN

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