Carrier 38VTA040 Dimensions and installation guide

1
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
®

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FIG. 2 38VTA040/050/060 DIMENSIONAL DRAWING

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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

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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

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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!!

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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

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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.

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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.

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TABLE 4
SUPERHEAT CHARGING TABLE
(SUPERHEAT ENTERING SUCTION SERVICE VALVE)
OUTDOOR INDOOR COIL ENTERING AIR (
0
F) WET_BULB
TEMP (
0
F) 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 (
0
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 (
0
F) 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 (
0
K) 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

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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