Installation; Refrigerant Piping - Carrier 38VTA040 Installation, Start-Up And Service Instructions Manual

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).
4
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
MODEL PIPING LENGTH (ONE WAY)
38VTA 5m 10m
040 0% 1.6%
050 0% 2.2%
060 0% 3.0%
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
MAX. MAX.
MODEL
HEIGHT, LENGTH,
38VTA
MAX. ALLOWABLE
H(m) L(m)
PRESSURE DROP
040
050 7 25
060
Note: 1) Values shown are for units operating at 7.2
and 35 0 C 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!
15m 20m 25m
2.6% 3.6% 4.6%
3.8% 5.2% 6.6%
5.0% 6.9% 8.8%
LIQUID LINE
MAX. ALLOWABLE
TEMPERATURE
(kPa) LOSS ( 0 C)
151 5
0 C saturated suction