Step 2 — rig and locate the unit, A caution, Step 3 — mount compressor – Carrier 38AQ034 User Manual
Page 2: Step 4 — complete connections, Caution
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•
Allow sufficient space for airflow clearance, wiring,
refrigerant piping and servicing unit. See Fig. 1.
•
Locate unit so that condenser airflow is unrestrieted
on all sides and above.
•
Unit has legs for mounting on level pad. See Fig. 2
and
Table
1
for
weight
distribution
based
on
recommended support points.
NOTE: If vibration isolators are required for a par
ticular installation, use the data in Table 1 and Fig. 2
to make proper selection.
Step 2 — Rig and Locate the Unit
A
CAUTION
Be sure unit panels are securely in place prior to
rigging.
Be
careful
rigging,
handling
and
installing
unit. Improper unit location can cause system mal
function and material damage.
RIGGING — Lift units at points 3, 4, 7, 8 (Fig. 2). Use
eyebolts and washers supplied in parts package. Do not
sling unskidded unit. Skidded unit may be slung provided
sling does not contact sides of unit. While unit is on skid,
it can be rolled or dragged.
IMPORTANT: SPREADER BARS MUST BE USED BETWEEN POINTS
3-4 AND 7-8
2
8
4
6
COIL
SECTION
+
+
COMPR
SECTION
TOP VIEW
Bo
LEG LOCATIONS
-H LIFTING POINTS
Fig. 2 — Weight Distribution
PLACING UNIT — Place unit so that airflow is un
restricted
above.
Provide
clearance
around
the
unit
as
shown in Fig. 1. Remove 6 hold-down bolts, releasing
skid. The legs are attached to base skid.
Block up or suspend unit. With bolts supplied, secure
legs (see Fig. 5) to unit (1, 2, 3, 4, 5 and 6 in Fig. 2 and
Table 1).
Table 1 — Weights
UNIT
38AQ
TOTAL
WEIGHT (lb)
Leg Location
1
2
3
4
5
6
024
2040
204
204
670
670
146
146
028
2160
203
203
592
642
235
285
034
2500
286
286
834
834
130
130
The unit may be mounted on a full pad or on raised
supports at each leg. Weight distribution shown in Fig. 2
will determine type of support required. Bolt unit securely
to pad or supports when positioned and leveled.
Step 3 — Mount Compressor
COMPRESSOR
MOUNTING
—
As
shipped,
the
com
pressor
is held
down by special self-locking
bolts and
lockwashers.
After
unit
is
installed,
remove
self-locking
bolts one at a time and reassemble with flanged washers
and neoprene snubbers as shown in Fig. 4. The flanged
washers and neoprene snubbers are shipped in a cloth
bag tied to one of the compressor feet. Tighten all 4
bolts, then loosen each until the flanged washer can be
moved sideways with finger pressure.
Step 4 — Complete
Connections
Refrigerant Piping
SIZE
REFRIGERANT
LINES
—
Consider
length
of
piping
required
between
outdoor
and
indoor
units,
amount of liquid lift and compressor oil return. Refer to
Part 3 of Carrier System Design Manual for line sizing
information.
Refer
to
indoor
unit
installation
instruc
tions for additional information.
Maximum
liquid
line
length
is
100
feet.
Carefully
determine the minimum expected unit capacity and size
interconnecting
lines
accordingly.
For
low
load
condi
tions, determine if there is a need for double suction
risers per Carrier System Design Manual. Consider vapor
line as hot gas line. Consider line sizes for heating as well
as cooling capacities.
A CAUTION
Piping must be properly sized and installed for the
system to operate efficiently.
FILTER
DRIERS
—
38AQ
units
have
factory-installed
filter driers. It is not necessary to add filter drier and check
valve arrangements in interconnecting piping. It is recom
mended that a field-supplied liquid moisture indicator be
installed in liquid line. Indoor units provide filter driers
with
heat
pump
piping
packages,
for
field
installation.
Refer to indoor unit installation instructions for details.
Complete refrigerant piping from indoor coil to out
door coil before opening liquid and suction lines at the
heat pump unit. See Table 3 for proper refrigerant charge
and piping selection data.
PROVIDE
SAFETY
RELIEF
—
A
fusible
plug
is
located on the liquid line before the liquid valve and on
top of the accumulator (Fig. 3). DO NOT CAP THIS
PLUG.
If
local
code
requires
additional
safety
devices,
install as directed.
HEAD PRESSURE CONTROL — Fan cycling for head
pressure control is a standard offering but functions in
cooling mode only. The no. 2 fan cycles as a function of
liquid
pressure
sensed
by
fan
cycling
pressure
switch
(FCPS). Fan no. 3 cycles as a function of outdoor air
temperature
through
the
action
of
the
air
temperature
switch (ATS). See Table 2 for settings. These switches are
automatically bypassed in heating mode. Table 4 shows
minimum
outdoor
ambient
temperatures
at
which
units
will operate and provide full cooling capacity.
RECEIVER — No receiver is provided with the unit; it
is recommended that one not be used.
PIPING
PROCEDURE
—
Do
not
remove
caps
from
vapor and liquid line stubs in compressor compartment
until piping connections are ready to be made. Pass nitro
gen or other inert gas through piping while brazing, to
prevent formation of copper oxide.
Install
thermostatic
expansion
valves
in
liquid
line
ahead of each indoor coil section.