How it Works
Carrier
Loading...
38AQ034
User Manual
14 pgs1.12 Mb0
Installation, Start-up And Service Instructions Manual
14 pgs1.14 Mb0
Installation, Start-up And Service Instructions Manual
20 pgs2.26 Mb0
User Manual
14 pgs409.7 Kb0
Table of contents
Loading...

Carrier 38AQ034 User Manual

38AO024,028,034
HEATING & COOLING
Installation, Start-Up and Service
Instructions

SAFETY CONSIDERATIONS

Installing, starting-up and servicing this equipment can be hazardous due to system pressures, electrical com ponents and location of equipment (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should install, start-up and service this equipment.
Untrained personnel can perform basic maintenance functions, such as cleaning coils, filters and replacing filters. All other operations should be performed by trained service personnel.
When working on equipment, observe precautions in the literature and on tags, stickers and labels attached to the equipment.
• Follow all safety codes
• Wear safety glasses and work gloves Keep quenching cloth and fire extinguisher nearby.
• Use care in handling, rigging and setting bulky equipment.

Heat Pump — Outdoor Units

A WARNING

To avoid electric shock and personal injury, be sure power to equipment is shut off before performing
maintenance or service.

INSTALLATION

IMPORTANT: Follow unit location, clearances and piping requirements in this booklet carefully to
enhance system efficiency, and to avoid system' failure Read entire booklet before starting installation.

Step 1 — Complete Pre-Installation Checks

INSPECT SHIPMENT — Immediately file claim with
shipping company if shipment is damaged or incomplete.
CONSIDER SYSTEM REQUIREMENTS
• Consult local building codes and National Electrical Code (NEC) for special installation requirements.
HINGED ACCESS DOOR-
'Measurements between mount
ing holes
Certified dimension drawings available upon request
LEGEND
(38AQ024,028,034)
A — 2V2-in. Diam K O for
Suction Line
B — 1%-in. Diam K.O. for
Liquid Line (024,034)
lYz-in. Diam K.O. for
Liquid Line (028)
C — Va-in. Diam K O. for
Control Power
D — 3ya-in Diam K O for Unit
Power
E — Two %-in Diam K O. for
Defrosf Interlock Wiring
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book
Tab
5a
PC111
Catalog No 533-846
PrintedinUSA Form 38AQ-9SI
For replacement items use Carrier Specified Parts
Pgi
1-89
Replaces: 38AQ-5SI
• 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
2 8 4 6
3-4 AND 7-8
+

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
Refrigerant Piping
Connections
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.
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
1
024 028 2160 203 034 2500 286 286 834
2040
204 204
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.
WEIGHT (lb)
Leg Location
2
3
670
203 592
4
5 6
670 146 146 642 235 285 834
130 130
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
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.
SUCTION PIPING AT INDOOR COIL AND TXV BULB LOCATION — The purpose of these recom mendations is to achieve good mixing of refrigerant leaving indoor coil suction header for proper sensing by the TXV bulb.
1. A minimum of two 90° elbows must be installed upstream of the expansion valve bulb location.
2. The TXV sensing bulb should be located on a vertical riser where possible. If a horizontal location is neces sary, secure the bulb at approximately the 4 o’clock position.
3. Size suction line from indoor coil through the riser for high velocity. Enter suction pipe sizing charts in
Table 2 — Physical Data
the Carrier System Design Manual at design tons and equivalent length (for 2 F loss). If reading falls between 2 sizes on chart, choose the smaller pipe size.
Suction piping for the high velocity section should be selected for about 0.5 F friction loss. If a 2 F loss is allowed for the entire suction line, 1.5 F is left for the balance of the suction line and it should be sized on that basis. Check that high-velocity sizing is adequate for oil return up the riser.
When the compressor is below indoor coil, the riser at indoor coil does not have to extend as high as the top level. After a 15 diameter riser has been provided, suction line may elbow down immediately.
UNIT 38AQ 024 028 034
14
35 4
2160
R-22
61
4
19
39 0 49 6
1
426 ± 7
5 ±3
20 ±5
2500
06E2275
6 6
24 000
OPERA TING WEIGHT (lb) 2040 REFRIGERANT
Operating Charge (ib)* 55
COMPRESSOR
Model No 06E2250 06E6265 Cylinders Oil (pts) Crankcase Heater (watts) 180
OUTDO OR AIR FANS
Number 3
Rpm; 60-Hertz 1140 (3-Ph); 1075 (Single-Phase) Diameter (in ) 26 30 30 Motor Hp
Cfm 15 000 24 000
Kilowatts 3 4 3 4 3 6
OUTDO OR COIL
Rows Deep . Fins/Inch 3 15 Face Area (sq ft) Storage Capacity (lb|t 70
CONTR OLS
High Press Switch (HPS)
Cutout (psig) Cut-in (psig) 320 ±20
Loss-of-Charge Switch (LC S) —
Liquid Line
Cutout (psig) Cut-in (psig)
FUSIBLE PLUG
3/4 1 1
UNIT38AQ CONTR OLS (cont)
71
19
99
Fan Cycling Press Switch (FCPS)—
No 2 Fan Cycling
Opens (psig) Closes (psig) 257 '¿S
THERM OSTAT
Defrost Therm ostat (DFT)
Opens (F) Closes (F)
Fan Cycling Thermostat (ATS) —
No 3 Fan Cycling
Opens (F) Closes(F)
FUSIBLE PLUG SETTING
Liquid Line (F) Accumulator (F)
OIL PRESS SAFETY SW ITCH (OPS)
Set Point (psig) Differential (psig)
'Approximate charge with 25 ft of interconnecting piping Use appropriate
charging charts for actuai charging of unit
fRefrigerant storage capacity at 120 F condensing temperature with con
denser 80% fuli of iiquid
LOSS-OF-CHARGE SWITCH
FAN CYCLING PRESSU RE SWITCH
DEFROST THERMOSTAT
AIR TEMPERATU RE SWITCH
024 1 028 034
126 ±4
65 ±5 28 ±3
70 ±3
83 max
210 ±10 170 ±10
9
28
FUSiBLE PLUG
ACCUMULATOR
MUFFLER COMPRESSOR
SERVICE VALVE
Fig. 3 — Component Locations
COMPRESSOR UNLOADER SOLENOID
SNUBBER FLANGED WASHER
Table 3 — Refrigerant (R-22) Charge and
Piping Selection Data
. neoprene
SNUBBER
ISOLATION SPRING
Fig. 4 ~ Compressor Mounting
NOTES
1 For mounting dimensions, see Fig 1.
2 Parts package contains all fasteners required for assem
bling 20-in. legs to unit
Fig. 5 — Mounting Legs for 38AQ Units
LENGTH OF PIPING (ft)*
OUTDOOR
UNIT
38AQ
024 028 034
0-25
L
V
%
1%
%
1%
%
U/s
26-60
Line Size (in. O.D.)
L V
1%
%
1%
%
2'/8
%
61-100t
L V
% 1 %
Vb 2 Va
% 2'/8
Approximate System Charge (lb)t
024 028 61 034
L — Liquid Line V — Vapor Line
'Approximately 4 elbows assumed in determining pipe sizes
fMaximum length of interconnecting piping is 100 feet.
^Approximate system charge is for estimating only It includes
charge requirements for one outdoor unit, matching indoor coil, and interconnecting piping System should be charged in accordance with installation instructions
NOTE Maximum liquid line size is %-in OD Maximum R-22 system charge is 85 lb (024), 95 lb (028), 105 lb (034)
55
71
58 65 79
75 83 93
Table 4 — Minimum Outdoor Air Operating
Temperature
MINIMUM OUTDOOR
UNIT COMPR
38AQ
024
028
034
CAP. (%)
100
50
100
67
100
67
CONO
TEMP (F)
90 28 -20 80
90 80
90 30 -20 80 33 -20
TEMPERATURE (F)*
Std Unit
Motormaster®
41 34
37
32LT
-20
-20
-20
.4^

Step 5 — Make Electrical Connections

POWER SUPPLY — Electrical characteristics of avail able power supply must agree with nameplate rating. Supply voltage must be within tolerances shown in Tableó. See Fig. 6 for System Label Diagram. Phase unbalance must not exceed 2%. Operation of unit on
improper supply voltage or with excessive phase un
balance constitutes abuse and is not covered by Carrier
Warranty.
POWER WIRING — All power wiring must comply
with applicable local requirements and National Elec
trical Codes. Install a field-supplied branch circuit dis
connect switch of a type that can be locked OFF or
OPEN. Run power wires from disconnect switch through
unit power opening (D on Fig 1 ) and connect to terminal
block just inside opening. See Table 5 for maximum
allowable wire size.
Power terminal block is in the control box. Remove outer panel and #10 screw on the door. Swing door open, remove screws on barrier panel and remove barrier panel. Replace barrier panel when power wiring is completed.
Condenser fans must rotate clockwise when viewed from above. If necessary, correct direction of fan rotation by reversing any 2 power input wires at disconnect switch.
Affix crankcase heater decal to unit disconnect switch. CONTROL CIRCUIT WIRING — Internal control
control circuit wiring must comply with applicable local
'Applies to cooling mode of operation only
Table 5 — Maximum Allowable Field Wire Sizes
UNIT
38Aa
024,028,034
Terminal Block (with integral compression terminal)
TB
and national codes. Route remote control wiring to unit control box through control opening (C on Fig. 1) and connect to control terminal block inside the control box.
All external control wiring is 24-volt, NEC Class 2. SAIL SWITCH — It is highly recommended that an
indoor airflow switch (field installed) be installed and
interlocked with the outdoor unit, to prevent the outdoor unit from operating in the event of indoor airflow failure
(example: broken fan belt). Operation of compressor with
no indoor airflow causes compressor to operate in a
vacuum which can damage bearing surfaces. Therefore,
install a field-supplied sail switch in the supply air duct work of the mating indoor fan coil unit, and wire to outdoor unit. See Fig 7.
VOLTS (60-Hz)
208/230 460, 575
WIRE SIZE
6 AWG to 350 MCM
14 AWG to 2/0
CONN.
TB
Table 6 — Electrical Data (3 Phase, 60 Hz)
UNIT
Volts
38AQ
024
028
Model
510
Nameplate
208/230 187 600 460 414 100 575
510 208/230 187
600 460
Supplied*
Min Max
518 632 41
414
MCA
253 508
103
51
253 145 225 508 69
100 575 518 632 62
034
510 208/230 187 600 460
414
253 170 508 72
100 575 518 632 64
FLA — Full Load Amps (fan motors) LRA — Locked Rotor Amps MCA — Minimum Circuit Amps Compiles with NEC Section
MOCP — Maximum Overcurrent Protection (fuse only) MTA — Must Trip Amps (circuit breaker) NEC — National Electric Code RLA — Rated Load Amps (compressor)
430-24
MOCP
175
80 60
110 100
250 110 100
COMPRESSOR
RLA
100 0 446
120 0
LRA MTA
76 0
345 53t
36 0 173
120
28 6
Total
50t 3 40t
(total)
70t 6 2
48 0 223
43.4
164
33t 6;t
3
506 84Í 50 0 253 35Í 45 0
176
63t 2 5 2 5
'Units are suitable for use on electrical systems where voltage
supplied to the unit terminals is not below or above the listed limits
t3-Pole circuit breaker ^6-Pole circuit breaker
3 3 6
FANS
Kw
No. 1
45 4 6
3 4 1 9
1 6
34
3 0
2.5 2.5 6 2
30 3 0 3 0
FLA (ea)
No 2 No. 3
1 9 1 9
1.6 1.6 6 6 6 6
3 0 3 0
6 6 6 6
46
2.5
2 5
Fig. 6 — System Label Diagram; 38AQ024,028,034
NOTES ,—I 1 Locate blue wire between [jJ on TB2B and terminal 7 of CR3
and cut
2 Splice airflow switch (AFS) (field supplied) contact wires (field
provided) to 2 ends of cut blue wire as depicted
AFS — Airflow switch (sail switch)
----------
Factory Wiring
-----------
Field Wiring
Fig. 7 — Field Wiring for Airflow Switch. 38AQ024, 028 or 034/40RR
TB2B
LEGEND
Equip Gnd — Equipment Ground IFC — Indoor Fan Contactor IFM — Indoor Fan Motor TB — Terminal Block (Board)
NOTES
1 This diagram applies to the follow
ing systems. 40RR024 with 38AQ 024, 40RR028 with 38AQ028 and
40RR034 with 38AQ034.
2. For wiring details of components, see schematic in each component
3 Use copper conductors only for IFM
wiring
^SPLICE^
BLU
BLU
I I I AFS I
CR3
Loading...
+ 9 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use