Carrier 38AQS008 User Manual
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS .................1
INSTALLATION ............................1-9
Step 1 — Complete Pre-Installation Checks ..1
• UNCRATE UNIT
• INSPECT SHIPMENT
• CONSIDER SYSTEM REQUIREMENTS
Step 2 — Rig and Mount the Unit ............2
• RIGGING
• MOUNTING
• COMPRESSOR MOUNTING
Step 3 — Complete Refrigerant Piping
Connections .............................2
• SIZE REFRIGERANT LINES
• FILTER DRIER AND MOISTURE INDICATOR
• LIQUID LINE SOLENOID VALVE
• SAFETY RELIEF
• SUCTION PIPING AT INDOOR COIL AND
TXV SENSING BULB LOCATION
Step 4 — Make Electrical Connections .......3
• FIELD POWER SUPPLY
• ACCESSORY ELECTRIC HEAT
• FIELD CONTROL WIRING
START-UP ...............................10,11
Preliminary Checks ........................10
Evacuate and Dehydrate ...................10
Refrigerant Charge ........................ 10
Refrigerant Service Ports ..................10
Sequence of Operation ....................10
Checking Cooling and Heating Control
Operation ...............................11
Malfunction ...............................11
SERVICE .................................11-13
Cleaning ..................................11
Lubrication ................................11
Outdoor-Fan Adjustment ...................11
Compressor Removal ......................11
Cooling Mode Operation ...................12
Heating Mode Operation ...................12
TROUBLESHOOTING CHART ..............14,15
START-UP CHECKLIST ................CL-1,CL-2
38AQS008
Air-Cooled Split System Heat Pump
50/60 Hz
Before installing or servicing system, always turn off
main power to system. There may be more than one disconnect switch. Electrical shock can cause personal
injury.
INSTALLATION
The 38AQS008 unit uses a semi-hermetic compressor. See
Tables 1A and 1B for physical data.
The 38AQS008 is approved by Carrier for use only with
40RMQ008 fan cooling units. Use only approved far coils.
The 38AQS008 (60 Hz) is Underwriters’Laboratories (UL)
and Canadian Underwriters’ Laboratories (CUL) approved
for use with the 40RMQ008 fan coil only.
Step 1 — Complete Pre-Installation Checks
UNCRATE UNIT (See Fig. 1) — Remove unit packaging
except for the top skid assembly and wood bumpers, which
should be left in place until after unit is rigged into place.
INSPECT SHIPMENT — File claim with shipping company if shipment is damaged or incomplete.
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install or service air-conditioning equipment.
When working on air-conditioningequipment,observeprecautions in literature and on tags and labels attached to unit.
Follow all safety codes. Wearsafety glasses and work gloves.
Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly.Consult local building codes and National Electrical Code U.S.A.
(NEC) for special installation requirements.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Ta b 5a 5 a
PC 111 Catalog No. 533-887 Printed in U.S.A. Form 38AQS-4SI Pg 1 6-95 Replaces: 38AQS-3SI
Fig. 1 — 38AQS008 Unit
Table 1A — Physical Data (English)
Table 1B — Physical Data (SI)
UNIT 38AQS008 60 Hz 50 Hz
OPERATING WEIGHT (lb)
Aluminum Coils (Standard) 540 594
Copper Coils (Optional) 608 662
RIGGING WEIGHT (lb)
Aluminum Coils (Standard) 590 644
Copper Coils (Optional) 658 712
REFRIGERANT* R-22
COMPRESSOR Reciprocating, Semi-Hermetic
Quantity...Type 1...06DA818 1...06DA824
Quantity Cylinders 46
Speed (rpm) 1750 1460
Oil Charge (oz) (ea) 88 128
OUTDOOR FAN Propeller; Direct Drive
Quantity...rpm 1...1100 1...960
Diameter (in.) 26 26
Motor Hp (NEMA)
Nominal Airflow (cfm) 6500 6100
OUTDOOR COIL Enhanced Copper Tubes,
Face Area (sq ft) 18.0
Storage Capacity (lb)† 16.56
Fins/in. 17.0
Rows (No.) 2
CONNECTIONS (Sweat)
Suction (in.) 1
Liquid (in.)
CONTROLS
Pressurestat Settings (psig)
High Cutout 426 ⫾ 7
Cut-in 320 ⫾ 20
Low Cutout 7 ⫾ 3
Cut-in 22 ⫾ 5
Defrost Thermostat
Initiate Defrost (F) 28
Terminates Defrost (F) 65
NEMA — National Electrical Manufacturing Association (U.S.A.)
*Unit is factory supplied with holding charge only.
†Storage capacity of coil with coil 80% full of liquid R-22 at 120 F.
LEGEND
3
⁄
4
Aluminum Lanced Fins
1
⁄
3
1
⁄
8
1
⁄
2
UNIT 38AQS008 60 Hz 50 Hz
OPERATING WEIGHT (kg)
Aluminum Coils (Standard) 245 270
Copper Coils (Optional) 276 299
RIGGING WEIGHT (kg)
Aluminum Coils (Standard) 268 292
Copper Coils (Optional) 298 323
REFRIGERANT* R-22
COMPRESSOR Reciprocating. Semi-Hermetic
Quantity...Type 1...06DA818 1...06DA824
Quantity Cylinders 46
Speed (r/s) 29.2 24.2
Oil Charge (L) (ea) 2.60 3.78
OUTDOOR FAN Propeller; Direct Drive
Quantity...r/s 1...18.3 1...16.0
Diameter (mm) 660 660
Motor Hp (NEMA)
Nominal Airflow (L/s) 3070 2900
OUTDOOR COIL Enhanced Copper Tubes,
Face Area (m
Storage Capacity (kg)† 7.5
Fins/m 669
Rows (No.) 2
CONNECTIONS (Sweat)**
Suction (in.) 1
Liquid (in.)
CONTROLS
Pressurestat Settings (kPa)
High Cutout 2937 ⫾ 48
Low Cutout 48 ⫾ 20
Defrost Thermostat
Initiate Defrost (C) −2.2
Terminates Defrost (C) 18.3
NEMA — National Electrical Manufacturing Association (U.S.A.)
*Unit is factory supplied with holding charge only.
†Storage capacity of coil with coil 80% full of liquid R-22 at 49 C.
**All pipe sizes are OD inches; equivalent sizes in millimeters follow:
2
) 1.67
Cut-in 2206 ⫾ 138
Cut-in 151 ⫾ 34
LEGEND
in. mm
1
⁄
11⁄
2
8
12.7
28.6
3
⁄
4
Aluminum Lanced Fins
1
⁄
3
1
⁄
8
1
⁄
2
CONSIDER SYSTEM REQUIREMENTS
• Consult local building codes and NEC (U.S.A.) for special installation requirements.
• Allow sufficient space for airflow clearance, wiring, refrigerant piping, and servicing unit. See Fig. 2.
• Locate unit so that outdoor unit airflow is unrestricted on
all sides and above. Refer to Fig. 2.
• Unit may be mounted on a level pad directly on base rails
or mounted on raised pads at support points. See Fig. 2 for
weight distribution based on recommended support points.
• Provide for condensate drainage and defrost water disposal beneath unit.
• Areas with high snowfall may need elevated mounting for
adequate airflow.
NOTE: If vibration isolators are required for a particular installation, use corner weight information in Fig. 2 to make
proper selection.
Step 2 — Rig and Mount the Unit
Be sure unit panels are securely in place prior to
rigging.
RIGGING — These units are designed for overhead rigging. Refer to rigging label for preferred rigging method.
Spreader bars are not required if top crating is left on unit.
All panels must be in place when rigging. (See Fig. 3.) As
further protection for coil faces, plywood sheets may be placed
against sides of unit, behind cables. Run cables to a central
suspension point so that angle from the horizontal plane is
not less than 45 degrees. Raise and set unit down carefully.
If it is necessary to roll unit into position, mount unit on
rails, using a minimum of 3 rollers. Apply force to rails, not
unit. If 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 unit.
Raise from above to lift unit from rails or pad when unit
is in final position.
After unit is in position, remove all shipping wrapping and
top crating.
MOUNTING — The unit must be elevated to ensure drainage from basepan during sub-freezing conditions and to prevent or limit blockage of outdoor coil during snowfall. Consideration should be given to specific geographical areas when
determining height of unit elevation.
COMPRESSOR MOUNTING — As shipped, compressors
are held down by 4 bolts. After unit is installed, loosen each
bolt until the snubber washer can be moved with finger pressure. See Fig. 4.
Step 3 — Complete Refrigerant Piping Connections —
uid connection is sweat with plastic cap. Refer to Table2 for
the proper line sizes. Follow standard piping practices.
Suction connection is sweat with plastic cap; liq-
2
Table 2 — Refrigerant Piping Sizes
LINEAR LENGTH OF PIPING — ft (m)
0-25
UNIT
38AQS
→
008
L—Liquid Line OD — Outside Diameter S—Suction Line
NOTES:
1. Pipe sizes are based on a 2° F (1° C) loss for liquid and suction
lines.
2. Pipe sizes are based on the maximum linear length shown for each
column, plus a 50% allowance for fittings.
3. Charge units with R-22 in accordance with unit installation
instructions.
4. Line size conversion to mm is:
(0-7.6)
LSLSLSLS
1
⁄211⁄
in. mm
1
⁄
2
5
⁄
8
3
⁄
4
11⁄
8
13⁄
8
8
25-50
(7.6-15.2)
Line Size (in. OD)
5
⁄811⁄
8
LEGEND
12.7
15.9
19
28.6
34.9
50-75
(15.2-22.9)
5
⁄
8
11⁄
8
75-100
(22.9-30.5)
5
⁄
8
SIZE REFRIGERANT LINES — Consider length of piping
required between 38AQS unit and 40RMQ unit, amount of
liquid lift, and compressor oil return. See Table 3 and also
refer to Part 3 of Carrier System Design Manual for design
details and line sizing. Refer to 40RMQ installation instructions for additional information.
Table 3 — Liquid Line Data
MAX
ALLOWABLE
UNIT
38AQS
008 75 22.9 65 19.8 7 48 2 1
1. The liquid lift in cooling mode is based on 80/67 F (22.7/19.4 C)
(db/wb [dry bulb/wet bulb]) entering indoor-air temperature and a
95 F (35 C) outdoor-air temperature, with R-22 refrigerant, at an
indoor airflow of 3000 cfm (1416 L/s).
2. The liquid lift in heating mode is based on 70/60 F (21.1/15.6 C)
(db/wb) entering indoor-air temperature and a 47/43 F (8.3/6.1 C)
(db/wb) outdoor-air temperature, with R-22 refrigerant, at an indoor airflow of 3000 cfm (1416 L/s).
LIQUID LIFT
Heating Cooling
ft m ft m psi kPa F C
Max Allowable
Pressure Drop
LIQUID LINE
Max Allowable
Temp Loss
FILTER DRIER AND MOISTURE INDICATOR — See
Fig. 5. The filter drier is factory supplied and field-installed
in the liquid line. Moisture indicator is field-supplied and
should be installed just after liquid line shutoff valve. Do not
use a receiver; there is none provided with unit and one should
not be used.
NOTE: Unit is shipped with R-22 holding charge. System
pressure must be relieved before removing caps. Recover refrigerant prior to brazing.
Pass nitrogen or other inert gas through piping while braz-
ing to prevent formation of copper oxide.
LIQUID LINE SOLENOID VALVE —A field supplied liq-
uid line solenoid valve (LLSV) is recommended when piping system length exceeds 75 ft (23 m). The LLSV must be
of the biflow type, suited for use in heat pump systems.
11⁄
NOTE: Carrier recommends part number EF23JS214 (Sporlan
model CB14S2,
5
⁄8-in. ODF/7⁄8-in. ODM) available from the
Replacement Components Division of Carrier Corporation.
This solenoid requires field supplied Sporlan MKC-2 coils.
Wire the solenoid in parallel with the compressor con-
tactor coil.
8
Install the LLSV near the outdoor unit. The flow arrow
must be pointed toward the outdoor unit.
SAFETY RELIEF — A fusible plug is located on top of the
accumulator. See Fig. 6. Note that all safety relief components are factory installed. Do not cap fusible plug. If local
code requires additional safety device(s), install as directed.
SUCTION PIPING AT INDOOR COIL AND TXV SENSING BULB LOCATION — To achieve good mixing of refrigerant leaving the indoor coil suction header for proper
sensing by the thermostatic expansion valve (TXV) bulb (see
Fig. 7):
1. A minimum of two 90-degree elbows should be installed
upstream of the TXV bulb location.
2. The TXV bulb should be located on a vertical riser where
possible. If a horizontal location is necessary, secure the
bulb at approximately the 4 o’clock position or the
8 o’clock position. See Fig. 7.
3. Enter suction pipe sizing charts in the Carrier System De-
sign Manual at design tons and equivalent length for
2° F (1° C) loss. If the reading falls between 2 sizes on
the chart, choose the smaller pipe size.
4. Make sure that the piping system has no inherent oil traps,
and the piping layout will not allow oil to migrate into an
idle evaporator coil.
5. Complete refrigerant piping from indoor coil to outdoor
coil before opening liquid and suction lines at the 38AQS
unit. See Tables 1A, 1B, and 2 for piping selection data.
Step 4 — Make Electrical Connections
Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may
consist of electrical wire connected to unit ground lug
in control compartment, or conduit approved for electrical ground when installed in accordance with NEC
ANSI (American National Standards Institute, U.S.A.)/
NFPA (National Fire Protection Association, U.S.A.) 70
and local electrical codes. Failure to follow this warning could result in the installer being liable for personal
injury of others.
FIELD POWER SUPPLY — All units except 208/230-v
(60 Hz) units are factory wired for the voltage shown on the
nameplate. If the 208/230-v unit is to be connected to a 208-v
power supply, the transformer must be rewired by moving
the black wire from the 230-v orange wire on the transformer and connecting it to the 208-v red wire from the transformer. The end of the orange wire must then be
insulated.
Refer to unit label diagram for additional information. Short
wire leads (pigtails) are provided for field wire connections.
Use factory-supplied splices or UL approved copper/
aluminum connector.
When installing units, provide a disconnect per NEC
(U.S.A.).
3399
UNIT
38AQS008
60 Hz
50 Hz
UNIT
W/ALUMINUM COIL
UNIT
W/COPPER COIL
WEIGHT CHART (WITH ALUMINUM COIL) WEIGHT CHART (WITH COPPER COIL)
Std Unit Corner W Corner X Corner Y Corner Z Std Unit Corner W Corner X Corner Y Corner Z
Dim. A Dim. B Dim. A Dim. B Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg
1
⁄2⬙
1⬘-8⬙
[508.0]
1⬘-6⬙
[457.2]
1⬘-5⬙
[431.8]
1⬘-7⬙
[482.6]
1⬘-9
[546.0]
1⬘-7
[495.3]
1⬘-43⁄4⬙
540 245 132 60 100 45 133 60 175 80 608 276 160 73 117 53 142 64 189 86
[425]
1
⁄2⬙
1⬘-63⁄4⬙
594 270 114 52 114 52 183 83 183 83 662 299 142 64 131 59 192 87 197 89
[476.3]
NOTES:
1. Dimensions in [ ] are in millimeters.
2. Center of Gravity. See chart for dimensions.
3. Direction of airflow.
4. Minimum clearance (local codes or jurisdiction may prevail):
a. Bottom to combustible surfaces, 0 in. (0 mm)
b. Outdoor coil, for proper airflow, 36 in. (914 mm) one side, 12 in.
(305 mm) the other. The side getting the greater clearance is optional.
c. Overhead, 60 in. (1524 mm) to assure proper outdoor-fan operation.
d. Between units, control box side, 42 in. (1067 mm) per National
Electrical Code (NEC, U.S.A.).
e. Between unit and ungrounded surfaces, control box side, 36 in.
(914 mm) per NEC (U.S.A.).
f. Between unit and block or concrete walls and other grounded surfaces,
control box side, 42 in. (1067 mm) per NEC (U.S.A.).
5. With the exception of the clearance for the outdoor coil as stated in
note 4b, a removable fence or barricade requires no clearance.
6. Units may be installed on combustible floors made from wood or Class A,
B, or C roof covering material.
7. Vertical center of gravity is approximately 40% of total unit height.
Fig. 2 — Dimensions
ELECTRICAL CONNECTIONS
CONNECTION SIZES
3
AA 1
⁄8⬙ Dia. [35] Field Power Supply Hole
BB 2⬙ Dia. [51] Power Supply Knock-Out
1
CC 2
DD
⁄2⬙ Dia. [64] Power Supply Knock-Out
7
⁄8⬙ Dia. [22] Field Control Wiring Hole
SERVICE VALVE CONNECTIONS
UNIT SUCTION LIQUID
38AQS008 1
1
⁄8⬙ [28.6]
1
⁄2⬙ [12.7]
4
MAX WEIGHT
UNIT
38AQS008
60 Hz 590 268 658 298
50 Hz 644 292 712 323
w/Al
Coil
Lb Kg Lb Kg in. mm in. mm in. mm
w/Cu
Fig. 3 — Rigging Label
Coil
ABC
45.0 1143 38.5 989 43.5 1105
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate (also see
Table 4). Voltages between phases must be balanced within
2% and the current within 10%. Use the formula shown in
Table 4, Note 2, to determine the percent voltage imbalance.
Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.
ACCESSORY ELECTRIC HEAT — If the system is to be
equipped with an accessory electric heater, refer to the
40RMQ008 installation instructions and Tables 5A and 5B.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation instructions included with the accessory.Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature in accordance with thermostat installation
instructions. Carrier-approved thermostat is Part Number
HH07AT-171. Subbase is HH93AZ-188.
Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 9) as described in Steps 1 through
3 below.
1. Connect thermostat wires to screw terminals of low-
voltage connection board.
2. Pass the control wires through the hole provided in the
corner post. (See Fig. 10.)
3. Feed wire through the raceway built into the corner post
to the 24-v barriers located on the left side of the control
box. The raceway provides the required clearance between the high- and low-voltage wiring.
Fig. 4 — Compressor Mounting
All field wiring must comply with NEC (U.S.A.) and lo-
cal requirements.
Install field wiring as follows:
1. Install conduit through side panel openings.
2. Install power lines to connections as shown in Fig. 8. Wrap
connections with electrical tape.
NOTE: 39 VA is available for field-installed accessories.
Control power requirement for heat pump outdoor unit is
36 VA(sealed). The factory-supplied control transformer is
75 VA.
NOTE: For wire runs, use the following insulated wire:
LENGTH
Ft M AWG sq mm
0-50 0-15.2 35 18 0.82
50-75 15.2-22.9 35 16 1.30
Over 75 Over 22.9 35 14 2.08
LEGEND
AWG — American Wire Gage
INSULATION
RATING (C)
SIZE
All wire larger than no. 18 AWG (American Wire Gage)
cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat.
5
LEGEND
NEC — National Electrical Code
TXV — Thermostatic Expansion Valve
*Accessory item.
†Field supplied.
NOTES:
1. All piping must follow standard refrigerant piping techniques. Refer to Carrier System Design Manual for details.
2. All wiring must comply with the applicable local and national codes.
3. Wiring and piping shown are general points-of-connection guides
only and are not intended for, or to include all details for, a specific
installation.
4. Liquid line solenoid valve (solenoid drop control) is recommended
to prevent refrigerant migration to the compressor. A biflow type
solenoid valve is required.
5. Filter drier must be of the biflow type, suitable for heat pump duty.
6. Internal factory-supplied TXV and bypass check valve not shown.
Fig.5—Typical Piping Diagram, 38AQS/40RMQ
6
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