Carrier 38AE User Manual
38AE
012,014,016
HEATING & COOLING
Air-Cooled Condensing Units
Installation, Start-Up and Service Instructions
50 and 60 Hz
INSTALLATION
Step 1 — Complete Pre-Installation Checks
UNCRATE UNIT — Remove unit packaging except for
the top skid assembly, which should be left in place until
after the unit is rigged into place.
INSPECT SHIPMENT — File claim with shipping com
pany if shipment is damaged or incomplete.
CONSIDER SYSTEM REQUIREMENTS
• Consult local building codes and National Electrical Code
(NEC, U.S.A.) for special installation requirements.
• Allow sufficient space for airflow clearance, wiring, re
frigerant piping, and servicing unit. See Fig. 1. See
Fig. 2 for unit component locations.
• Locate unit so that outdoor coil (condenser) airflow is
unrestricted on all sides and above.
• Unit may be mounted on a level pad directly on the base
channels or mounted on raised pads at support points.
See Table 2 for weight distribution based on recom
mended support points.
NOTE: If vibration isolators are required for a particular
installation, use the data in Table 2 to make the proper
selection.
A — 1V4 in. (32) diam. knockout for %-in. (16) ODM liquid line connection
B — 1%in (44 5)diam knockout for 1’/a in (28 6) (38AE012); 1%in (35) suction line connection (38AE014,016)
C — %-in (22.2) diam knockout for control power
D — 2-in (50 8) diam knockout for unit power
LEGEND
Certified dimension drawings are available on request.
NOTES:
1
SERVICE AREAS - Allow 3 ft (914) on both
sides and 2 ft (610) on both ends of unif for
servicing
Dimensions in parentheses are in (mm)
Fig. 1 - Physical Data and Dimensions (ft-in.)
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book|1 |1 PC 111 Catalog No 533-816 Printed in U S.A. Form 38AE-17SI Pg 1 4-92 Replaces: 38AE-10SI
Tab 3a 2a
Table 1 — Physical Datrf^
ENGLISH
UNIT 38AE 012 014
OPERATING WEIGHT (lb)
REFRIGERANT (lb)‘ 22
COMPRESSOR
Model No.
Oil (pt)
Crankcase Heater Watts
Unloader Setting (pslg)
Load
Unload
OUTDOOR-AIR FANS
No. ...Rpm
Diameter (in.)
Motor Hp
Nominal Cfm Total
OUTDOOR COIL
Face Area (sq ft)
Storage Capacity (lb)t
CONTROLS
Pressurestat Settings (pslg)
High Cutout
Cut-in
Low Cutout
Cut-in
FUSIBLE PLUG
NEMA — National Electrical Manufacturing Association
‘Unit is factory supplied with holding charge only.
tStorage capacity is measured at liquid saturated temperatures of 125 F for
38AE012; 123 F for 38AE014; and 130 F for 38AE016
732 779
Reciprocating, Hermetic, 6 Cylinder;
06DD824 1 06DD328 I 06DD537
27 2
1750 Rpm
10
75
70 ± 1
60 ± 2
Axial Flow, Direct Drive
2 1075
24
V2
8800
29.2
40.3
395 ± 10
295 ± 10
29 ± 4
200 F
016
789
39 8
SI
UNIT 38AE
OPERATING WEIGHT (kg) 333 354
REFRIGERANT (kg)*
COMPRESSOR
Model No.
Oil (L)
Crankcase Heater Watts
Unloader Setting (kPa)
Load
Unload
OUTDOOR-AIR FANS
No. ...Rps
Diameter (mm)
Motor Hp
Nominal L/s Total
OUTDOOR COIL
Face Area (sq m)
Storage Capacity (kg)f
CONTROLS
Pressurestat Settings (kPa)
High Cutout
Cut-in
Low Cutout
Cut-in
FUSIBLE PLUG
NEMA — National Electrical Manufacturing Association
‘Unit is factory supplied with holding charge only
tStorage capacity is measured at liquid saturated temperatures of 51 7 C for
38AE012; 50 6 C for 38AE014; and 54 4 C for 38AE016
012 014
10
Reciprocating, Hermetic, 6 Cylinder;
06DD824 1 06DD328 | 06DD537
124
29.2 Rps
4.73
75
483 ± 6 9
414 ±13 8
Axial Flow, Direct Drive
2...17.9
610
1/2
4153
2.71
183 18.1
2724 ± 68 9
2034 ± 68 9
200 ± 27.6
414 ± 0
93 3 C
016
359
103
Low-Voltage Fuse
1 2 - No. 1 Fan
High-Pressure Switch
3 -
4 - Circuit Breakers
5 — No. 2 Fan
6 — Terminai Biock 1 (Unit Power)
7 — Terminal Block 2 (Control Power)
8 — Muffler
Fig. 2 — Component Locations
LEGEND
— Hot Gas Bypass Piping Stub (%-in ODM)
9
— Low-Pressure Switch
10
— Compressor
11
— Wraparound Coil
12
Table 2 — Weight Distribution
UNIT
38AE
r
012
014
016
Oper
Wt
732 (333) 142 (65)
779 (354)
789 (359) 143 (65)
WEIGHT - lb (kg)
Support Point
A B C
138 (63) 225 (102)
143 (65)
140 (64) 247 (112)
143 (65) 250 (114)
COIL
D
227(103)
249 (113)
253 (115)
INSTALL FILTER DRIER(S) AND MOISTURE INDICATOR(S) — Every unit should have a filter drier and liquidmoisture indicator (sight glass). In some applications, de
pending on space and convenience requirements, it may be
desirable to install 2 filter driers and sight glasses. One fil
ter drier and sight glass may be installed at A locations in
Fig. 3. Or, 2 filter driers and sight glasses may be installed
at B locations.
Select the filter drier for maximum unit capacity and min
imum pressure drop. Complete the refrigerant piping from
indoor unit to outdoor unit before opening the liquid and
suction lines at the outdoor unit.
TOP VIEW
Step 2 — Rig and Mount the Unit
A CAUTION
Be sure unit panels are securely in place prior to
rigging.
RIGGING — These units are designed for overhead rig
ging only. For this purpose, the transverse base channels
extend beyond the sides of the unit, with holes provided in
end plates to attach cables or hooks. Rig with top skid pack
aging assembly in place to prevent unit damage by the rig
ging cable. As further protection for the coil faces, plywood
sheets may be placed against the sides of the unit, behind
the cables. Run the cables to a central suspension point so
that the angle from the horizontal is not less than 45 de
grees. Raise and set the unit down carefully.
If it is necessary to roll the unit into position, mount the
unit on longitudinal rails, using a minimum of 3 rollers.
Apply force to the rails, not the unit. If the unit is to be
skidded into position, place it on a large pad and drag it by
the pad. Do not apply any force to the unit.
Raise from above to lift unit from the rails or pad when
unit is in final position.
COMPRESSOR MOUNTING — As shipped, the compres
sor is held tightly in place by self-locking bolts. Before
starting unit, loosen self-locking boits until the
flanged washer is stiil snug but can be moved side
ways with finger pressure. Do not remove ship
ping bolts.
Step 3 — Complete Refrigerant Piping
Connections
SIZE REFRIGERANT LINES - Consider the length of
piping required between outdoor unit and indoor unit (evap
orator), the amount of liquid lift, and compressor oil re
turn. See Table 3 and also refer to Part 3 of Carrier System
Design Manual for design details and line sizing. Refer to
indoor installation instructions for additional information.
Table 3 - Liquid Line Data
MAX
UNIT
38AE
*lnlet and outlet.
NOTE: Figures shown are for units operating at 45 F (7.2 C) saturated suction
and 95 F (35 C) entering air
ALLOW.
LIQUID
LIFT
ft(m)
52 (15 8) 7 (48.3)
012
67 (20.4) 7 (48 3)
014
016
82 (25) 7 (48 3)
Max Allow.
Press. Drop
psig (kPa)
LIQUID LINE
Max Allow.
Temp
Loss
•F (”C)
2(1 1) %
2(1 1)
2(1 1)
Filter Drier and
Sight Glass
Flare Conn.*
in. (mm)
Ye
Ys
Fig. 3
INSTALL LIQUID LINE SOLENOID VALVE - SOLE
NOID DROP — It is recommended that a solenoid valve
be placed in the main liquid line (see Fig. 3) between con
densing unit (38AE) and fan coil (40RR, 40RE). This valve
prevents refrigerant migration (which causes oil dilution) to
the compressor during the off cycle at low outdoor ambient
temperatures. The solenoid should be wired in parallel with
the compressor contactor coil. This means of electrical con
trol is referred to as solenoid drop control.
INSTALL LIQUID LINE SOLENOID VALVE (OP
TIONAL) - CAPACITY CONTROL - If 2-step cooling
is desired, place a solenoid valve in the location shown in
Fig. 3.
DO NOT USE A RECEIVER — No receiver is provided
with the unit. It is recommended that one NOT be used.
MAKE PIPING CONNECTIONS - Do not remove plas
tic dust plugs from suction and liquid line stubs in the com
pressor compartment until piping connections are ready to
be made. Pass nitrogen or other inert gas through piping
while brazing to prevent formation of copper oxide.
Install field-supplied thermostatic expansion valve(s) to
indoor section. If 2 thermostatic expansion valves are in
stalled for 2-step cooling, install field-supplied liquid line
solenoid valve ahead of the second expansion valve.
Locations of Sight Glass(es)
and Filter Drier(s)
PROVIDE SAFETY RELIEF — A fusible plug is located
on the compressor crankcase (Fig. 4). Do not cap this plug.
If local code requires additional safety devices, install them
as directed.
FUSIBLE PLUG
TERMINAL BOARD (JB^) IN
38AE CONTROL BOX
Route power wires through opening in unit end panel to
connection in unit control box as shown on unit label dia
gram and Fig. 5. Unit must be grounded.
Affix crankcase heater warning sticker to unit disconnect
switch.
CONTROL CIRCUIT WIRING - Control voltage is 24 v.
See Fig. 6 and unit label diagram for field-supplied wiring
details. Route control wires through opening in unit end
panel to connection in unit control box.
TERMINAL BOARD (TB2) IN 38AE CONTROL BOX
I DISCONNECT PER NEC, USA. |
I_______________________________I
LEGEND
EQUIP GND — Equipment Ground
NEC — National Electrical Code
----------
Field Wiring
Fig. 5 - Main Power Supply Wiring
Step 4 - Complete Electrical Connections
POWER WIRING — Unit is factory wired for voltage shown
on nameplate. Provide adequate fused disconnect switch within
sight from unit and readily accessible from unit, but out of
the reach of children. Lock switch open (off) to prevent
power from being turned on while unit is being serviced.
Disconnect switch, fuses, and field wiring must comply with
national and local code requirements.
LEGEND
C
HD IFC LLSV R -
----------
----------NOTES:
1. Combination LLSV plus IFC va should not exceed 30 va.
2. Do not exceed 5 va (24 vac) per coil.
3. If va values shown in Notes 1 and 2 must be exceeded,
Compressor Contactor
Heating Device
Indoor-Fan Contactor
Liquid Line Solenoid Valve
Relay
Field Wiring
Factory Wiring
accessory relay transformer package 38AE900001.
R2
Fig. 6 “ Remote Thermostat Wiring
L2
use
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