Page 1
38AK007,008,012
Fig. 1 — Model 38AK (Size 007 Shown)
38AKS008,009,012
Air-Cooled Condensing Units
Installation, Start-Up and
Service Instructions
50/60 Hz
CONTENTS
SAFETY CONSIDERATIONS
INSTALLATION
Step 1 — Complete Pre-Installation Checks
• UNCRATE UNIT
• INSPECT SHIPMENT
• CONSIDER SYSTEM REQUIREMENTS
Step 2 — Rig and Mount the Unit
• RIGGING
• COMPRESSOR MOUNTING
Step 3 — Complete Refrigerant Piping
Connections
• SIZE REFRIGERANT LINES
• FILTER DRIER AND MOISTURE INDICATOR
Step 4 — Make Electrical Connections
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
START-UP
Preliminary Checks
Compressor Rotation
Evacuate and Dehydrate
Refrigerant Charge
Compressor Overload
Cycle-LOC™ Device (CLO)
Low-Pressure/Loss-of-Charge Switch (LPS)
High-Pressure Switch (HPS)
High Flow Valves
Refrigerant Service Ports
Cooling
Sequence of Operation
Oil Charge
SERVICE
Cleaning
Lubrication
Condenser-Fan Adjustment
Capacity Control — Unit 38AKS012 Only
Compressor Removal
Crankcase Heater (Except 38AK007)
TROUBLESHOOTING GUIDE
START-UP CHECKLIST
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11,12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . .13,14
. . . . . . . . . . . . . . . . . . CL-1, CL-2
Page
. . . . . . 1
. . . . . 10
Follow all safety codes. Wear safety 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
(NEC) (U.S.A. Standard) for special installation requirements.
Before installing or servicing system, always turn off main
power to system and install lockout tag on disconnect.
There may be more than one disconnect switch. Electrical
shock can cause personal injury.
INSTALLATION
The 38AK007, 008, and 012 units use hermetic compressors. The 38AKS008, 009, and 012 units use semi-hermetic
compressors. See Table 1A or 1B for physical data.
Step 1 — Complete Pre-Installation Checks
UNCRATE UNIT (S ee 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.
INSP E C T SHI PM E N T — 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-conditioning equipment, observe precautions in literature and on tags and labels attached to unit.
NOTE: Ensure voltage listed on unit data plate agrees with
electrical supply to unit.
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 3 a 2 a
PC 111 Catalog No. 533-80003 Printed in U.S.A. Form 38A-9SI Pg 1 5-01 Replaces: 38A-8SI
Page 2
Table 1A — Physical Data — 50/60 Hz (English)
UNIT 38 AK007 AK008 AK012 AKS008 AKS009 AKS012
OPERATING WEIGHT (lb)
Aluminum Coils (Standard)
Copper Coils (Optional)
RIGGING WEIGHT (lb)
Aluminum Coils (Standard)
Copper Coils (Optional)
REFRIGERANT*
COMPRESSOR
Bristol, Reciprocating Copeland, Scroll Copeland, Scroll Reciprocating, Semi-Hermetic
Quantity...Type
Quantity Cylinders
Speed (rpm) — 60 Hz
— 50 Hz
Oil Charge (oz)
CONDENSER FAN — 60 Hz
Quantity...Rpm
Diameter (in.)
Motor Hp (NEMA)
Nominal Airflow (cfm)
CONDENSER FAN — 50 Hz
Quantity...Rpm
Diameter (in.)
Motor Hp (NEMA)
Nominal Airflow (cfm)
CONDENSER COIL
Face Area (sq ft)
Storage Capacity (lb)†
CONNECTIONS (sweat)
Suction (in.)
Liquid (in.)
CONTROLS
Pressurestat Settings (psig)
High Cutout
Cut-in
Low Cutout
Cut-in
LEGEND
NEMA —
*Unit is factory supplied with holding charge only.
†Storage capacity of condenser coil with coil 80% full of liquid R-22 at 124 F.
National Electrical Manufacturing Association
NOTE: Unit 38AKS012 has one step of unloading. Full load is 100% capacity, and one
step of unloading is 67% capacity. Unit 38AKS012 has the following unloader settings:
load is 70 ± 1 psig and unload is 60
±
340 392 426 510 564 564
386 460 503 578 632 632
390 442 476 560 614 614
436 510 553 628 682 682
1...H26A72Q 1...ZR94KC 1...ZR125KC 1...06DA818 1...06DA824
2——4 6
3500 3500 3500 1750 1750
65 85 110 88 128
Propeller; Direct Drive
1...850 1...1100
26 26
1
/
3
3800 6500 7000 6500 6500 6500
Propeller; Direct Drive
3150 5400 5800 5400 5400 5400
Enhanced Copper Tubes, Aluminum Lanced Fins
12.24 15.75 20.5 18.0 18.0 18.0
11.26 14.88 18.87 16.56 16.56 16.56
1
/
1
8
1
/
2
11/
8
1
/
2
426 ± 7
320 ± 20
2 psig.
R-22
1...960
26
1
/
3
11/
8
5
/
8
7 ± 3
22 ± 5
1460 1460
3
/
4
11/
1
8
/
2
11/
5
/
8
8
1...06DH824
(See Note)
11/
8
5
/
8
2
Page 3
Table 1B — Physical Data — 50/60 Hz (SI)
UNIT 38 AK007 AK008 AK012 AKS008 AKS009 AKS012
OPERATING WEIGHT (kg)
Aluminum Coils (Standard)
Copper Coils (Optional)
RIGGING WEIGHT (kg)
Aluminum Coils (Standard)
Copper Coils (Optional)
REFRIGERANT*
COMPRESSOR
Bristol, Reciprocating Copeland, Scroll Copeland, Scroll Reciprocating, Semi-Hermetic
Quantity...Type
Quantity Cylinders
Speed (r/s) — 60 Hz
— 50 Hz
Oil Charge (L)
CONDENSER FAN — 60 Hz
Quantity...R/s
Diameter (mm)
Motor Hp (NEMA)
Nominal Airflow (L/s)
CONDENSER FAN — 50 Hz
Quantity...R/s
Diameter (mm)
Motor Hp (NEMA)
Nominal Airflow (L/s)
CONDENSER COIL
Face Area (sq m)
Storage Capacity (kg)†
CONNECTIONS (sweat)
Suction (in.)
Liquid (in.)
CONTROLS
Pressurestat Settings (kPa)
High Cutout
Cut-in
Low Cutout
Cut-in
LEGEND
NEMA —
*Unit is factory supplied with holding charge only.
†Storage capacity of condenser coil with coil 80% full of liquid R-22 at 51 C.
National Electrical Manufacturing Association
NOTES:
1. Unit 38AKS012 has one step of unloading. Full load is 100% capacity, and one
step of unloading is 67% capacity. Unit 38AKS012 has the following unloader
settings: load is 483 ± 6.9 kPa and unload is 414 ± 13.8 kPa.
2. Equivalent mm values for connectors are as follows:
in.
1
/212.7
5
/815.9
1
/828.6
1
mm
154 177 192 231 256 256
175 208 215 262 287 287
176 200 215 254 279 279
198 231 250 285 309 309
1...H26A72Q 1...ZR94KC 1...ZR125KC 1...06DA818 1...06DA824
2——4 6
58.4 58.4 58.4 29.2 29.2
48.4 48.4 48.4 24.2 24.2
1.92 2.51 3.25 2.60 3.78
Propeller; Direct Drive
1...14.2 1...18.3
660 660
1
/
3
1800 3050 3300 3050 3050 3050
Propeller; Direct Drive
1490 2550 2750 2550 2550 2550
Enhanced Copper Tubes, Aluminum Lanced Fins
1.14 1.46 1.90 1.67 1.67 1.67
5.1 6.75 8.6 7.5 7.5 7.5
1
/
1
8
1
/
2
11/
8
1
/
2
R-22
1...16.0
660
1
/
3
11/
8
5
/
8
2937 ± 48
2206 ± 138
48 ± 20
151 ± 34
1...06DH824
(See Note 1)
3
/
4
11/
8
1
/
2
11/
8
5
/
8
11/
8
5
/
8
3
Page 4
CONSIDER SYSTEM REQUIREMENTS
• Consult local building codes and NEC for special installation requirements.
• Allow sufficient space for airflow clearance, wiring,
refrigerant piping, and unit servicing. See Fig. 2.
• Locate unit so that condenser 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
Table 2 for weight distribution based on recommended
support points.
NOTE: If vibration isolators are required for a particular installation, use corner weight information in Table 2 to make
proper selection.
Table 2 — Weight Distribution
UNIT
38AK
007
008
012
S008
S009,S012
007
008
012
S008
S009,S012
STD UNIT
Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg
340 154 86 39 53 24 77 35 124 56
392 177 86 39 78 35 99 45 107 49
426 192 89 40 92 42 109 49 105 48
510 231 115 52 89 40 133 60 173 87
564 256 133 60 97 44 141 64 193 88
386 175 106 48 65 30 82 37 133 60
460 208 114 52 95 43 108 49 121 55
503 215 118 53 116 53 119 54 119 54
578 262 143 65 106 48 142 64 187 85
632 287 161 73 114 52 150 68 207 94
CORNERWCORNERXCORNERYCORNER
With Aluminum Coil
With Copper Coil
Z
Raise from above to lift unit from rails or pad when unit is
in final position.
After unit is in position, remove all shipping materials and
top crating.
COMPRESSOR MOUNTING — Compressors are shipped
from the factory 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 —
cap; liquid connection is sweat with plastic cap. Refer to
Table 3A or 3B for the proper line sizes. Follow standard
piping practices.
SIZE REFRIGERANT LINES — Consider length of piping
required between condensing unit and air handler, amount of
liquid lift, and compressor oil return. See Table 4A and 4B and
also refer to Part 3 of Carrier System Design Manual for design
details and line sizing. Refer to air handle r instal lation instructions for additional information.
Table 3A — Refrigerant Piping Sizes — 60 Hz
UNIT
38
AK007
AK008
AK012
AKS008
AKS009
AKS012
LEGEND
Liquid LIne
L—
Suction Line
S—
Suction connection is sweat with plastic
LINEAR LENGTH OF PIPING — FT (M)
0-25
(0-7.6)
LSLSLSLS
1
1
/
2
1/
1
2
5
1
/
8
1
1
/
2
5
1
/
8
5
1
/
8
1
/
8
1
/
8
1
/
8
1
/
8
1
/
8
1
/
8
25-50
(7.6-15.2)
1
/
2
1
/
2
5
/
8
1
/
2
5
/
8
5
/
8
50-75
(15.2-22.9)
Line Size (in. OD)
1
1
1
/
/
8
2
1
5
1
/
/
8
8
3
5
1
/
/
8
8
1
5
1
/
/
8
8
1
5
1
/
/
8
8
1
5
1
/
/
8
8
1
1
/
1
1
/
3
1
/
1
1
/
3
1
/
3
1
/
(22.9-30.5)
1
8
5
8
5
8
5
8
5
8
5
8
75-100
/
2
/
8
/
8
/
8
/
8
/
8
1
1
1
1
1
1
1
/
8
3
/
8
3
/
8
3
/
8
3
/
8
3
/
8
NOTES:
1. Dimensions in [ ] are in millimeters.
2. See Fig. 3 for additional information.
Step 2 — Rig and Mount the Unit
Be sure unit panels are securely in place prior to rigging.
RIGG ING — 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 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.
Table 3B — Refrigerant Piping Sizes — 50 Hz
LINEAR LENGTH OF PIPING — FT (M)
0-25
UNIT
(0-7.6)
38
LSLSLSLS
1
1
AK007
AK008
AK012
AKS008
AKS009
AKS012
/
2
1
1
/
2
5
1
/
8
1
1
/
2
5
1
/
8
5
1
/
8
LEGEND
Liquid LIne
L—
Suction Line
S—
NOTES FOR TABLES 3A AND 3B:
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:
mm
in.
1
/
12.7
2
5
/
15.9
8
1
/828.6
1
3
1
/834.9
1
/
8
1
/
8
1
/
8
1
/
8
1
/
8
1
/
8
25-50
(7.6-15.2)
1
/
2
1
/
2
5
/
8
1
/
2
5
/
8
5
/
8
50-75
(15.2-22.9)
Line Size (in. OD)
1
1
1
/
/
8
2
1
5
1
/
/
8
8
3
5
1
/
/
8
8
1
5
1
/
/
8
8
1
5
1
/
/
8
8
1
5
1
/
/
8
8
1
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
(22.9-30.5)
1
8
5
8
5
8
5
8
5
8
5
8
75-100
/
2
/
8
/
8
/
8
/
8
/
8
1
1
/
8
3
1
/
8
3
1
/
8
3
1
/
8
3
1
/
8
3
1
/
8
4
Page 5
UNIT 38 DIM. A DIM. B DIM. C DIM. D DIM. E DIM. F
AK007
AK008
AK012
AKS008
AKS009
AKS012
NOTES:
1. Dimensions in [ ] are in millimeters.
2. Center of Gravity. See chart for
3. Direction of Airflow.
4. Minimum clearance (local codes or jurisdiction
5. With the exception of the clearance for the con-
6. Units may be installed on combustible floors
dimensions.
may prevail):
a. Condenser coil, for proper airflow, 36 in. [914]
one side, 12 in. [305] the other. The left or rear
side getting the greater clearance is optional.
b. Overhead, 60 in. [1524] to assure proper con-
denser fan operation.
c. Between units, control box side, 42 in. [1067]
per NEC (National Electrical Code) (U.S.A.
Standard).
d. Between unit and ungrounded surfaces, con-
trol box side, 36 in. [914] per NEC.
e. Between unit and block or concrete walls and
other grounded surfaces, control box side,
42 in. [1067] per NEC.
denser coil as stated in Note 4b, a removable
fence or barricade requires no clearance.
made from wood or Class A, B, or C roof covering
material.
1
1′-6
[470.0]
1′-8″
[508.0]
1′-9″
[533.4]
1′-6″
[457.2]
1′-7″
[482.6]
1′-7″
[482.6]
/2″
1′-23/4″
[375.0]
1
/2″
1′-6
[470.0]
1′-8″
[508.0]
3
1′-4
/4″
[425.5]
1′-5″
[431.8]
1′-5″
[431.8]
—
—
—
—
2′-0″
[609.6]
2′-913/16″
[858.8]
13
2′-9
/
16
[858.8]
13
2′-9
/16″
[858.8]
″
1′-21/4″
[362]
1′-3″
[381]
1′-3″
[381]
1′-3″
[381]
1′-3″
[381]
1′-3″
[381]
1′-45/16″
[415]
5
/16″
2′-
[613]
5
/16″
2′-
[613]
2′-5/16″
[613]
5
2′-
/
[613]
2′-5/16″
[613]
ELECTRICAL CONNECTIONS
2′-95/16″
[846.5]
7
/16″
3′-5
[1052.5]
3′-57/16″
[1052.5]
3′-57/16″
[1052.5]
7
″
3′-5
″
16
/
16
[1052.5]
3′-57/16″
[1052.5]
AA 1
BB 2″ Dia [51] Power Supply Knockout
CC 2
DD
SERVICE VALVE CONNECTIONS — 50/60 Hz
UNIT 38 SUCTION LIQUID
AK007 1
AK008 1
AK012 1
AKS008 1
AKS009 1
AKS012 1
CONNECTION SIZES
3
/8″ Dia [35] Field Power Supply Hole
1
/2″ Dia [64] Power Supply Knockout
7
/8″ Dia [22] Field Control Wiring Hole
1
/8″ [28.6] 11/2″ [12.7]
1
″ [28.6] 1
/
8
1
″ [28.6] 1
/
8
1
″ [28.6] 1
/
8
1
″ [28.6] 1
/
8
1
″ [28.6] 1
/
8
1
/
2
5
/
8
1
/
2
5
/
8
5
/
8
″ [12.7]
″ [15.9]
″ [12.7]
″ [15.9]
″ [15.9]
Fig. 2 — Dimensions (ft-in.)
UNIT
38
AK007 390 176 45.0 1143 38.5 978 35.5 904
AK008 442 200 45.0 1143 38.5 978 43.5 1105
AK012 476 215 45.0 1143 38.5 978 43.5 1105
AKS008 560 254 45.0 1143 38.5 978 43.5 1105
AKS009 614 279 45.0 1143 38.5 978 43.5 1105
AKS012 614 279 45.0 1143 38.5 978 43.5 1105
*Weights are for aluminum coils.
Fig. 3 — Rigging Label
5
RIGGING
WEIGHT*
ABC
lb kg in. mm in. mm in. mm
Page 6
Fig. 4 — Typical Compressor Mounting
208/230-3-60
380-3-60
460-3-60
575-3-60
220-3-50
400-3-50
LEGEND
Fig. 5 — Power Wiring Connections
C—
Contactor
NEC —
National Electrical Code
Field Wiring
Factory Wiring
Splice Connection (Factory Supplied)
(38AKS Units)
FILTER DRIER AND MOISTURE INDICATOR — The filter drier is factory installed. 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.
Install field-supplied thermostatic expansion valve to evap-
orator section. It is recommended that a field-supplied liquid
line solenoid be positioned in the main liquid line close to the
evaporator coil, and wired to close when compressor stops to
minimize refrigerant migration during the ‘‘OFF’’ cycle.
Table 4A — Liquid Line Data — 60 Hz
LIQUID LINE
Max Allowable
Temp Los s
UNIT
38
AK007
AK008
AK012
AKS008
AKS009
AKS012
MAX
ALLOWABLE
LIQUID LIFT
Ft M psi kPa F C
86 26.2 7 48.3 2 1
60 18.3 7 48.3 2 1
70 21.3 7 48.3 2 1
60 18.3 7 48.3 2 1
65 19.8 7 48.3 2 1
65 19.8 7 48.3 2 1
Max Allowable
Pressure Drop
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)/NFPA (National Fire Protection Association) 70 (U.S.A. Standards) and local electrical
codes. Failure to follow this warning could result in the
installer being liable for personal injury of others.
FIELD PO WER S UPPLY — All units except 208/230-v
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 tr ansformer must be rewired by moving the black
wire from the 230-v
and connecting it to the 200-v
transformer.
Refer to unit label diagram for additional information.
Pigtails are provided for field wire connections. Use factorysupplied splices or UL (Underwriters’ Laboratories) (U.S.A.
Standard) approved copper/aluminum connector.
When installing units, provide a disconnect per NEC. All
field wiring must comply with NEC and local requirements.
Install field wiring as follows:
1. Install conduit through side panel openings.
2. Install power lines to connections as shown in Fig. 5.
Wrap connections with electrical tape.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate (also see Table 5). Voltages between phases must be balanced within 2%
and the current within 10%. Use the formula shown in Table 5,
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.
1
/4-in. spade terminal on the transformer
1
/4-in. spade terminal from the
NOTE: Values shown are for units operating at 45 F (7.2 C) saturated suction and 95 F (35 C) entering air.
UNIT
AK007
AK008
AK012
AKS008
AKS009
AKS012
NOTE: Values shown are for units operating at 45 F (7.2 C) saturated suction and 95 F (35 C) entering air.
Table 4B — Liquid Line Data — 50 Hz
LIQUID LINE
Max Allowable
38
MAX
ALLOWABLE
LIQUID LIFT
Ft M psi kPa F C
76 23.2 7 48.3 2 1
50 15.2 7 48.3 2 1
57 17.4 7 48.3 2 1
50 15.2 7 48.3 2 1
52 15.8 7 48.3 2 1
52 15.8 7 48.3 2 1
Max Allowable
Pressure Drop
Temp Loss
6
Page 7
Table 5 — Electrical Data
UNIT
38
AK007
AK008
AK012
AKS008
AKS009
AKS012
NOMINAL VOLTAGE
(V-Ph-Hz)
208/230-3-60 187 254 21.8 158 1.9 30.1 40
460-3-60 414 508 10.0 79 1.0 13.6 20
575-3-60 518 632 9.0 65 1.9 14.1 20
220-3-50 198 242 21.8 158 1.0 28.8 35
400-3-50 360 440 10.0 79 1.0 14.0 20
208/230-3-60 187 254 28.8 195 3.8 39.8 50
460-3-60 414 508 14.7 95 1.9 20.3 25
575-3-60 518 632 10.8 80 1.9 15.4 20
220-3-50 198 242 28.8 195 1.5 37.5 45
400-3-50 360 440 14.7 95 1.5 19.9 25
208/230-3-60 187 254 37.8 239 3.8 39.8 20
460-3-60 414 508 17.2 125 2.2 20.3 30
575-3-60 518 632 14.3 90 1.9 15.4 25
220-3-50 198 242 37.8 239 1.4 48.8 60
400-3-50 360 440 17.2 125 1.4 23.0 30
208/230-3-60 187 254 31.5 160 3.1 42.5 50
380-3-60 342 418 19.0 75 2.2 26.0 35
460-3-60 414 508 15.7 80 1.4 21.0 25
575-3-60 518 632 12.6 64 1.4 17.2 20
220-3-50 198 253 31.5 160 1.4 42.5 50
400-3-50 342 460 15.7 80 1.4 21.0 25
208/230-3-60 187 254 39.7 198 3.1 52.7 70
380-3-60 342 418 24.0 93 2.2 32.2 40
460-3-60 414 508 19.9 99 1.4 26.3 35
575-3-60 518 632 15.9 79 1.4 21.3 25
220-3-50 198 253 39.7 198 1.4 52.7 70
400-3-50 342 460 19.9 99 1.4 26.3 35
208/230-3-60 187 254 39.7 198 3.1 52.7 70
380-3-60 342 418 24.0 93 2.2 32.2 40
460-3-60 414 508 19.9 99 1.4 26.3 35
575-3-60 518 632 15.9 79 1.4 21.3 25
220-3-50 198 253 39.7 198 1.4 52.7 70
400-3-50 342 460 19.9 99 1.4 26.3 35
VOLTAGE RANGE COMPRESSOR OFM POWER SUPPLY
MIN MAX RLA LRA FLA MCA MOCP
LEGEND
CSA —
FLA —
HACR —
LRA —
MCA —
MOCP —
NEC —
OFM —
RLA —
UL —
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker.
2.
Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%.
the percent of voltage imbalance.
Canadian Standards Association
Full Load Amps
Heating, Air Conditioning and Refrigeration
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code (U.S.A. Standard)
Outdoor (Condenser) Fan Motor
Rated Load Amps
Underwriters’ Laboratories
Use the following formula to determine
= 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
3. The 575-v units are CSA only.
4. the 380 v, 60 Hz units and all 50 Hz units are
listed.
= 1.53%
452 + 464 + 455
1371
=
3
= 457
7
457
3
not
UL or CSA
7
Page 8
FIELD CONTR OL 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.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals to low-voltage connections on
unit (shown in Fig. 6) as described in Steps 1 through 3 below.
NOTE: For wire runs, use the following insulated wire:
LENGTH
Ft M AWG sq mm
0-50 0-15.2
50-75 15.2-22.9
Over 75 Over 22.9
LEGEND
AWG —
American Wire Gage
INSULATION
RATING (C)
35 18 0.82
35 16 1.30
35 14 2.08
SIZE
All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and
splice at the the rmo stat .
1. Connect thermostat wires to screw terminals of lowvoltage connection board.
2. Pass the control wires through the hole provided in the
corner post. (See Fig. 7.)
3. Feed wire t hrough the raceway built i nto the corner post
and into the 24 v thermostat connection board. The 24 v
thermostat connection is located on the left side of the
low-voltage connection compartment. The raceway provides the UL required clearance between hi gh- and lowvoltage wiring.
24-V BARRIER
LOW-VOLTAGE
THERMOSTAT
CONNECTION
BOARD
RACEWAY
CORNER
POST
Fig. 7 — Field Control Wiring Raceway
(38AKS Unit Shown)
Total combined amperage drain of the field-installed liquid
line solenoid valve and indoor (evaporator) fan contactor must
not exceed 22 va. If the specified va must be exceeded , use a
remote relay to switch the load.
LEGEND
AHA — Adjustable Heat Anticipator
C—Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
CC — Cooling Compensator
CLO — Compressor Lockout
COMP — Compressor Motor
HPS — High-Pressure Switch
IFC — Indoor (Evaporator) Fan Contactor
LLSV — Liquid Line Solenoid Valve
LPS — Low-Pressure Switch
NEC — National Electrical Code
OFC — Outdoor-Fan Contactor
OFM — Outdoor-Fan Motor
QT — Quadruple Terminal
TB — Te r m i na l B l oc k
TRAN — Transformer
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Te r mi na l Bl oc k
Splice
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common
potential only.
Not to represent wiring.
Ground
Fig. 6 — Typical Control Wiring Connections/Component Arrangement (38AK Shown)
8
Page 9
START-UP
Fig. 8A — Cooling Charging Chart — 38AK007
(60 Hz)
Fig. 8B — Cooling Charging Chart — 38AK007
(50 Hz)
Preliminary Checks
1. Field electrical power source must agree with unit nameplate rating.
2. Check that all internal wi ring connections are tight and
that all barriers, covers, and panels are in place. Ensure no
electrical wires are in contact with refrigerant tubing.
3. Ensure all service valves are open. On 38AKS units, be
sure all compressor service valves are backseated.
4. Verify that compre ssor holddown bolts for units 38AKS
have been loosened and that flat/snubber washers can be
rotated by applying finger pressure (snug, but not tight).
5. Verify compressor crankcase heater is securely in place.
Crankcase heater must operate for at least 24 hours before
start-up. The 38AK unit size 007 does not require a
crankcase heater.
6. Note that compressor oil level is visible in the sight glass
(38AKS units only).
7. Check for leaks in refrigerant system by using soap bubbles and/or electronic leak detector.
8. Check that liquid line solenoid valve is located at evaporator coil as shown in Filter Drier and Moisture Indicator
section, page 6.
9. Check voltage imbalance as shown in Ta ble 5, Note 2.
10. Check that both outdoor and indoor units are properly
mounted in accordance with installation instructions and
applicable codes.
Compressor Rotation —
compressors, it is important to be certain compressor is rotating
in the proper direction. To determine whether or not compressor is rotating in the proper direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge
pressure does not rise to normal levels:
1. Note that the condenser fan is probably also rotating in
the wrong direction.
2. Turn off power to the unit, tag disconnect.
3. Reverse any two of the unit power leads.
4. Reapply power to the compressor, verify correct
pressures.
The suction and discharge pressure levels should now move
to their normal start-up levels.
Evacuate and Dehydrate —
entire refrigerant system by use of the methods described in
Carrier GTAC II, Module 4, System Dehydration. Evacuate
system down to 500 microns and ensure vacuum hold for
15 minutes. If vacuum does not hold, pressurize system and
locate leak and repair.
Refrigerant Charge —
Module 5, Charging Recovery, Recycling, and Reclamation.
Unit panels must be in place when unit is operating during
charging procedure.
Unit is shipped with holding charge only. Weigh in 7 lb
(3 kg) of R-22 to start unit.
CHARGE COOLING — Use Cooling Charging Charts,
Fig. 8A or 8B and 9A or 9B. Unit must be charged in cooling
mode only. Vary refrigerant until the conditions of the chart are
On 3-phase units with scroll
Evacuate and dehydrate
Refer to Carrier GTAC II,
met. Note that charging charts are different from type normally
used. Charts are based on charging the units to the correct subcooling for the various operating conditions. Accurate pressure
gage and temperature sensing device are required. Connect the
pressure gage to the service port on the liquid line service
valve. Mount the temperature sensing device on the liquid line,
close to the liquid line service valve and insulate it so that outdoor ambient temperature does not affect the reading. Indoor
airflow must be within the normal operating range of the unit.
Operate unit a minimum of 15 minutes. Ensure pressure and
temperature readings have stabilized. Plot liquid pressure and
temperature on chart and add or reduce charge to meet curve.
Adjust charge to conform with charging chart, using liquid
pressure and temperature to read chart.
9
Page 10
Fig. 9A — Cooling Charging Chart — 38AK008,012
Fig. 9B — Cooling Charging Chart — 38AK008,012
Compressor Overload —
power to the compressor when either the current or int ernal
motor winding temperature becomes excessive, and automatically resets when the internal temperature drops to a safe level.
This overload may require up to 60 minutes (or longer) to reset.
If the internal overload is suspected of being open, disconnect
the electrical power to the unit and check the circuit through the
overload with an ohmmeter or continuity tester.
Cycle-LOC™ Device (CLO) —
vice prevents the compressor from starting or running in a high
pressure, loss-of-charge or freezestat open situation. Reset the
and 38AKS008,009,012 (60 Hz)
and 38AKS008,009,012 (50 Hz)
This overload interrupts
The Cycle-LOC de-
Cycle-LOC device by setting the t hermostat t o elimi nate cool ing demand and return it to the original set point. If the system
shuts down again for the same fault, determine the possible
cause before attempting to reset the Cycle-LOC device.
Low-Pressure/Loss-of-Charge Switch (LPS) —
When the liquid line pressure drops below 7 psig (48 kPa), the
LPS opens 24-v power to the compressor contactor and stops
the compressor. When the pressure reaches 22 psig (152 kPa),
the switch resets and the compressor is allowed to restart.
High-Pressure Switch (HPS) —
ant high-side pressure reaches 426 psig (2937 kPa), the HPS
opens 24-v power to the compressor contactor and stops the
compressor. When the pressure drops to 320 psig (2206 kPa ),
the switch resets and the compressor is allowed to restart.
Refrigerant Service Ports —
3 service ports: one on the suction line, one on the liquid line,
and one on the compressor discharge line. Be sure caps on t he
ports are tight.
High Flow Valves —
and suction tubes are high flow valves. Large black plastic caps
distinguish these valves with O-rings located inside the caps.
These valves cannot be accessed for service in the field. Ensure
the plastic caps are in place and tight or the possibility of refrigerant leakage could occur.
Cooling —
system selector switch at COOL position and fan switch at
AUTO. position. Adjust thermostat to a setting below room
temperature. Compressor starts on closure of contactor.
Check cooling effects at a setting below room temperature.
Check unit charge. Refer to Refrigerant Charge section on
page 9.
Reset thermostat at a position above room temperature.
Compressor will shut off.
TO SHUT OFF UNIT — Set s y stem selector switch at OFF
position. (Resetting thermostat at a position above room temperature shuts unit off temporarily until space temperature exceeds thermostat setting.) Units are equipped with CycleLOC™ protection device. Unit shuts down on any safety trip
and remains off. Check reason for safety trip.
Compressor restart is accomplished by manual reset of the
thermostat by turning the selector switch to OFF position and
then to ON position.
Set space thermostat to OFF position. Set
Located on the compressor hot gas
Sequence of Operation —
calls for cooling. With all safety devices satisfied, the compressor contactor and fan contactor energize, causing the compressor and outdoor (condenser) fan motor to operate. Contacts
close, allowing the field-supplied and -installed indoor (evaporator) fan contactor to function. The recommended fieldsupplied and -installed liquid line solenoid valve will also
open, allowing the system to function in cooling. As cooling
demand is satisfied, the thermostat contacts break, deenergizing the contactor causing the system to shut off. The liquid line
solenoid valve closes, minimizing the potential for refrigerant
migration at this time. The compressor does not restart until the
thermostat again calls for cooling. The system is protected by a
Cycle-LOC device so that t he compressor will not start if a
high-pressure or low-pressure fault occurs. Compressor restart
is accomplished by manual reset of the thermostat by turning
the selector switch to OFF position and then to ON position.
This should be done only once. If system shuts down due to the
same fault, determine the problem before attempting to reset
the Cycle- LOC de vi ce.
When the refriger-
Each unit system has
At start-up, the the rmostat
10
Page 11
Oil Charge (Tables 1A and 1B)
Fig. 11 — Propping Up Top Panel
Fig. 12 — Separating Coil Sections
Fig. 10 — Cleaning Condenser Coil
38AKS UNITS — Allow unit to run for about 20 minutes.
Stop unit and check compressor oil level. Add oil only if necessary to bring oil into view in sight glass. Use only Carrier-
approved compress or oil.
Approved oils are:
Suniso 3GS
WF32-150
38AK UNI TS — The 38AK units do not have a sight glass
and are factory charged with the correct amount of oil.
ALL UNITS — Do not reuse drained oil or use any oi l that
has been exposed to atmosphere. Procedures for adding or removing oil are given in Carrier Standard Service Techniques
Manual, Chapter 1, Refrigerants.
If oil is added, run unit for an additional 10 minutes. Stop
unit and check oil level. If level is still low, add oil only after
determining that piping system is designed for proper oil return
and that system is not leaking oil.
SERVICE
When servicing unit, shut off all electrical power to the unit
to avoid shock hazard or injury from rotating parts.
Cleaning —
cooling season and as operating conditions require.
CONDENSER COIL — Inspect coil monthly. Clean con-
denser coil annually and as required by location or outdoor-air
conditions.
Clean coil as follows:
1. Turn off unit power and tag disconnect.
2. Remove and save top panel screws on condensing unit.
3. Remove condenser coil corner post. See Fig. 10. To hold
top panel open, place coil corner post between top panel
and side panel. See Fig. 11.
4. Remove bracket holding coil sections together a t return
end of condenser coil. Carefully separate the outer coil
section 3 to 4 in. (75 to 100 mm) from the inner coil
section. See Fig. 12.
5. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and
debris. Clean the outer surfaces with a stiff bristled brush
in the normal manner.
6. Reposition the coil section and secure.
7. Remove the coil corner post fr om between the top panel
and side panel.
8. Install the coil corner post and replace all screws removed
in Step 2.
Inspect unit interior at the beginning of each
Lubrication
COMPRESSORS — Each compressor is charged with correct
amount of oil at the factory. For additional information on
38AKS units, refer to the Oil Charge section above.
FAN MOTOR BEARING S — Fan motor bearings are of the
permanently-lubricated type. No further lubrication is required.
Condenser-Fan Adjustment (Fig. 13)
1. Shut off unit power supply and tag disconnect.
2. Remove condenser-fan assembly (grille, motor, motor
cover, and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 13.
5. Tighten setscrews.
6. Replace condenser-fan assembly.
11
Page 12
Capacity Control — Unit 38AKS012 Only —
A
suction pressure-actuated unloader controls 2 cylinders and
provides capacity control. Unloaders are factory set (see
T able 1A or 1B), but may be field adjusted as follows:
CONTROL SET POINT (cylinder load point) is adjustable
from 0 to 85 psig (586 kPa). To adjust, turn control set point
adjustment nut (Fig. 14) clockwise to its bottom stop. In this
position, set point is 85 psig (586 kPa). Then, turn adjustment
counterclockwise to desired control set point. Every full turn
counterclockwise decreases set point by 7.5 psig (51.7 kPa).
PRESSURE DIFFERENTIAL (difference between cylinder
load and unload points) is adjustable from 6 to 22 psig (41.4 to
152 kPa). T o adjust, turn press ure dif ferential adjustment screw
(Fig. 14) counterclockwise to its back stop position. In this
position, differential is 6 psig (41.4 kPa). Then, turn adjustment clockwise to desired pressure differential. Every full turn
clockwise increases differential by 1.5 psig (10.3 kPa).
NOTE: Fan height adjustments are as follows:
UNIT in. mm
38AK007 (60 Hz)
All 50-Hz Units
All 60-Hz Units
(Except 38AK007)
4.50 114
6.42 163
Fig. 13 — Condenser-Fan Adjustment
Compressor Removal —
See Tables 1A and 1B for
compressor information. Follow safety codes and wear safety
glasses and work gloves.
1. Shut off power to unit and tag disconnect. Remove unit
access panel (front of unit).
2. Remove refrigerant from system using refrigerant removal methods described in the Carrier GTAC-II, Module 5,
Charging, Recovery, Recycling, and Reclamation.
3. Disconnect compressor wiring at compressor terminal
box.
4. Remove bolts from suction flange and discharge service
valves (38AKS008,009,012 units only). Loosen sweat
connections (38AK007,008, and 012 units only).
Excessive movement of copper lines at compressor
may cause higher levels of vibration when unit is restored
to service.
5. Remove crankcase heater from compressor base
(38AKS008,009,012, 38AK008,012).
6. Remove compressor holddown bolts.
7. Remove compressor from unit.
8. Clean system. Add new liquid line filter drier.
9. Install new compressor in unit.
10. Connect suction and discharge lines to compressor, as
applicable. Ensure that compressor holddown bolts are in
place.
11. Connect wiring.
12. Install crankcase heater on 38AKS008,009,012 and
38AK008,012 units.
13. Evacuate and recharge unit.
14. Restore unit power.
Crankcase Heater (Except 38AK007) —
The crankcase heater on the 38AK008,012 condensing units prevents
refrigerant migration and c ompressor oil dilution during shutdown when compressor is not operating.
Close both compressor service valves if applicable (on
38AKS008,009,012) when crankcase heater is deenergized for
more than 6 hours.
Fig. 14 — Compressor Capacity Control Unloader
12
Page 13
SYMPTOM CAUSE REMEDY
Compressor does not run —
Contactor open
Compressor does not run —
Contactor closed
Compressor cycles on highpressure switch —
Condenser fan on
Compressor cycles on highpressure switch —
Condenser fan off
Compressor cycles on lowpressure switch —
Evaporator fan running
Airflow restricted —
Low suction pressure
Indoor (evaporator) fan stopped —
Low suction pressure
Compressor runs but cooling
insufficient —
Suction pressure low
Compressor runs but cooling
insufficient —
Suction pressure high
TROUBLESHOOTING GUIDE
Power off. Restore power.
Fuses blown. Replace with correct fuses after finding cause and correcting.
Transformer open/shorted. Replace transformer if primary windings are receiving power and
Thermostat circuit open. Check thermostat setting.
Low-pressure switch open. Check for refrigerant undercharge or system leak.
High-pressure switch open. Check for refrigerant overcharge or obstruction of outdoor airflow.
Connections loose. Tighten all connections.
Compressor motor thermostat open. Check for excessive motor temperature.
Compressor leads loose, broken. Check connections with power off.
Single phasing. Replace blown fuse.
Compressor internal overload open. Allow compressor motor windings to cool down to reset overload.
High-pressure switch faulty. Replace switch.
Airflow restricted. Dirty coil. Remove obstruction, clean condenser coil.
Air recirculating. Clear airflow area.
Noncondensables in system. Recover, evacuate and recharge as required. Refer to Carrier
Refrigerant overcharge. Recover as required.
Refrigerant system restrictions. Check or replace filter drier, expansion valve, etc.
Fan slips on shaft. Tighten fan hub screws.
Motor not running. Check power and capacitor
Motor bearings seized. Replace motor.
Motor overload open. Check overload rating. Check for fan blade obstruction.
Motor burned out, windings open. Replace motor.
Filter drier plugged. Replace filter drier.
Expansion valve power head
defective.
Low refrigerant charge. Find leak, repair, evacuate system, and recharge.
Expansion valve restricted/plugged. Remove and replace expansion valve.
Evaporator coil iced up. Check refrigerant charge.
Evaporator coil dirty. Clean coil fins.
Indoor-air filter dirty. Clean or replace filters.
Indoor-air dampers closed. Check damper operation and position.
Electrical connections loose. Tighten all connections.
Fan relay defective. Replace relay.
Motor overload open. Check power supply.
Motor defective. Replace motor.
Fan belt broken or slipping. Replace or tighten belt.
Refrigerant charge low. Add charge.
Head pressure low. Check refrigerant charge.
Indoor-air filters dirty. Clean or replace filters.
Expansion valve power head
defective.
Expansion valve restricted/plugged. Remove and replace expansion valve.
Evaporator coil partially iced. Check low-pressure setting.
Evaporator airflow restricted. Remove obstruction.
Heat load excessive. Check for open doors or windows.
Reverse rotation. Check compressor rotation (see page 9).
no output.
Determine cause for overload opening.
GTAC-II, Module 5, Charging, Recovery, Recycling, and
Reclamation.
1
/3 and 3/4 hp motor.
Replace power head.
Replace power head.
NOTE: See Fig. 15 for component arrangements.
13
Page 14
C—
CAP —
CB —
CLO —
COMP —
EQUIP —
GND —
NEC —
OFC —
OFM —
QT —
TB —
Contactor, Compressor
Capacitor
Circuit Breaker
Compressor Lockout
Compressor Motor
Equipment
Ground
National Electrical Code
Outdoor-Fan Contactor
Outdoor-Fan Motor
Quadruple Terminal
Terminal Block
Fig. 15 — Typical Component Arrangement
LEGEND
TRAN —
Transformer
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Factory Wiring
Field Power Wiring
Accessory or Optional Wiring
Copyright 2001 Carrier Corporation
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 3 a 2 a
PC 111 Catalog No. 533-80003 Printed in U.S.A. Form 38A-9SI Pg 14 5-01 Replaces: 38A-8SI
Page 15
I. Preliminary Information
START-UP CHECKLIST
OUTDOOR:
INDOOR:
ADDITIONAL ACCESSORIES ______________________________________________________________________________
MODEL NO. _______________________________ SERIAL NO. ____________________________________
AIR HANDLER MANUFACTURER __________________________________________________________________
MODEL NO.__________________________________ SERIAL NO. ____________________________________
II. Pre-Start-Up
OUTDOOR UNIT
IS THERE ANY SHIPPING DAMAGE? _______________ (Y/N) __________
IF SO, WHERE: __________________________________________________________________________________________
_______________________________________________________________________________________________________
WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) _________
CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT? (Y/N) _________
HAS THE GROUND WIRE CIRCUIT BEEN CONNECTED PER NEC GUIDELINES? (Y/N) _______
HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY? (Y/N) __________
ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY? (Y/N) __________
38AKS Only:
(Y/N) _________
HAS COMPRESSOR ROTATION BEEN VERIFIED (Is compressor rotating in correct direction?) (Y/N) _______
HAVE COMPRESSOR HOLDDOWN BOLTS BEEN LOOSENED (Snubber washers are snug, but not tight)?
CONTROLS
ARE THERMOSTAT AND INDOOR-FAN CONTROL WIRING CONNECTIONS MADE AND CHECKED? (Y/N) _____
ARE ALL WIRING TERMINALS (including main power supply) TIGHT? (Y/N) ______
HAS CRANKCASE HEATER BEEN ENERGIZED FOR 24 HOURS? (Y/N) ______
INDOOR UNIT
HAS WATER BEEN PLACED IN DRAIN PAN TO CONFIRM PROPER DRAINAGE? (Y/N) ________
ARE PROPER AIR FILTERS IN PLACE? (Y/N) __________
HAVE FAN AND MOTOR PULLEYS BEEN CHECKED FOR PROPER ALIGNMENT? (Y/N) _______
DO THE FAN BELTS HAVE PROPER TENSION? (Y/N) _________
HAS CORRECT FAN ROTATION BEEN CONFIRMED? (Y/N) ________
PIPING
IS LIQUID LINE SOLENOID VALVE LOCATED AT THE EVAPORATOR COIL AS REQUIRED? (Y/N) ______
HAVE LEAK CHECKS BEEN MADE AT COMPRESSOR, CONDENSER, EVAPORATOR, TXVs (Thermostatic Expansion Valves)
SOLENOID VALVES, FILTER DRIERS, AND FUSIBLE PLUGS WITH A LEAK DETECTOR? (Y/N) _______
LOCATE, REPAIR, AND REPORT ANY LEAKS. ________________________________________________________________
ON 38AKS UNIT, HAVE ALL COMPRESSOR SERVICE VALVES BEEN FULLY OPENED (BACKSEATED)? (Y/N) _______
HAVE LIQUID LINE SERVICE VALVE AND SUCTION LINE SERVICE VALVE BEEN OPENED? (Y/N) ______
IS THE OIL LEVEL IN THE COMPRESSOR CRANKCASE ON THE 38AKS UNIT IN VIEW IN THE COMPRESSOR
SIGHT GLASS? (Y/N) __________
CL-1
Page 16
CHECK VOLTAGE IMBALANCE
LINE-TO-LINE VOLTS: AB________ V AC________ V BC ________V
(AB + AC + BC)/3 = AVERAGE VOLTAGE = _________ V
MAXIMUM DEVIATION FROM AVERAGE VOLTAGE = _________V
VOLTAGE IMBALANCE = 100 X (MAX DEVIATION)/(AVERAGE VOLTAGE) = _________ %
IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START SYSTEM!
CALL LOCAL POWER COMPANY FOR ASSISTANCE.
III. Start-Up
CHECK INDOOR (EVAPORATOR) FAN SPEED AND RECORD. ___________
CHECK OUTDOOR (CONDENSER) FAN SPEED AND RECORD. _____________
AFTER AT LEAST 15 MINUTES RUNNING TIME, RECORD THE FOLLOWING MEASUREMENTS:
OIL PRESSURE (38AKS only) ___________
SUCTION PRESSURE ___________ Psig (kPa)
SUCTION LINE TEMP ___________ °F (°C)
DISCHARGE PRESSURE ___________ Psig (kPa)
DISCHARGE LINE TEMP ___________ °F (°C)
ENTERING CONDENSER-AIR TEMP ___________ DB
LEAVING CONDENSER-AIR TEMP ___________ DB
EVAP ENTERING-AIR DB (dry bulb) TEMP ___________
EVAP ENTERING-AIR WB (wet bulb) TEMP ___________
EVAP LEAVING-AIR DB TEMP ___________
EVAP LEAVING-AIR WB TEMP ___________
COMPRESSOR AMPS (L1/L2/L3) ______ / ______ / _______
HAS REFRIGERANT CHARGE BEEN ADJUSTED PER CHARGING CHARGE? __________
NOTES:
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Copyright 2001 Carrier Corporation
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 3 a 2 a
PC 111 Catalog No. 533-80003 Printed in U.S.A. Form 38A-9SI Pg CL-2 5-01 Replaces: 38A-8SI
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