6
FILTER DRIER AND MOISTURE INDICATOR — The fil-
ter 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
NOTE: Values shown are for units operating at 45 F (7.2 C) satu-
rated suction and 95 F (35 C) entering air.
Table 4B — Liquid Line Data — 50 Hz
NOTE: Values shown are for units operating at 45 F (7.2 C) satu-
rated suction and 95 F (35 C) entering air.
Step 4 — Make Electrical Connections
FIELD POWER SUP PLY — 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 transformer must be rewired by moving the black
wire from the 230-v 1/4-in. spade terminal on the transformer
and connecting it to the 200-v 1/4-in. spade terminal from the
transformer.
Refer to unit label diagram for additional information.
Pigtails are provided for field wire connections. Use factory-
supplied 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 Ta-
ble 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 compo-
nents. Such operation would invalidate any applicable Carrier
warranty.
UNIT
38
MAX
ALLOWABLE
LIQUID LIFT
LIQUID LINE
Max Allowable
Pressure Drop
Max Allowable
Temp Lo ss
Ft M psi kPa F C
AK007 86 26.2 7 48.3 2 1
AK008 60 18.3 7 48.3 2 1
AK012 70 21.3 7 48.3 2 1
AKS008 60 18.3 7 48.3 2 1
AKS009 65 19.8 7 48.3 2 1
AKS012 65 19.8 7 48.3 2 1
UNIT
38
MAX
ALLOWABLE
LIQUID LIFT
LIQUID LINE
Max Allowable
Pressure Drop
Max Allowable
Temp Loss
Ft M psi kPa F C
AK007 76 23.2 7 48.3 2 1
AK008 50 15.2 7 48.3 2 1
AK012 57 17.4 7 48.3 2 1
AKS008 50 15.2 7 48.3 2 1
AKS009 52 15.8 7 48.3 2 1
AKS012 52 15.8 7 48.3 2 1
Unit cabinet must have an uninterrupted, unbroken electri-
cal 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 com-
partment, or conduit approved for electrical ground when
installed in accordance with NEC ANSI (American
National Standards Institute)/NFPA (National Fire Protec-
tion 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.
Fig. 4 — Typical Compressor Mounting
(38AKS Units)
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)