Wiring Diagrams
Units Produced After January 1996
INDEX
UNIT
38AKS
ELECTRICAL
CHARACTERISTICS
(V-Ph-Hz)
SCHEMATIC
DIAGRAM
FIG. NO.
COMPONENT
ARRANGEMENT
FIG. NO.
LABEL DIAGRAM
(On Unit)
NO. 38AK
013-024
208/230-3-60
1
2
501206
380-3-60
1
2
501206
230-3-50
1
2
501206
346-3-50*
1
2
501206
400-3-50
1
2
501206
460-3-60
3
4
501207
575-3-60
3
4
501207
*38AKS024 only.
Remote Thermostat Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 5
Programmable Electronic Thermostat Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 6
Accessory Transformer Relay Package
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 7
Accessory Winter Start Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 8
Motormaster® Control Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fig. 9-15
SAFETY CONSIDERATIONS
Installation, start-up, and servicing of this equipment can
be hazardous due to system pressures, electrical compo-
nents, and equipment location (roofs, elevated structures, etc.)
Only trained, qualified installers and service mechanics
should install, start up, and service this equipment.
When working on the equipment, observe precautions in
the literature, tags, stickers, and labels attached to the equip-
ment, and any other safety precautions that apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling, rigging, and setting bulky equipment.
• Use care in handling electronic components.
ELECTRIC SHOCK HAZARD
Open all remote disconnects before servicing
this equipment.
OPERATING SEQUENCE
Cooling —
When the first stage (TC1) of the cooling ther-
mostat closes, the timer starts. After approximately
3 seconds, the timer activates the compressor and fan
motor no. 1. When the liquid pressure builds to approxi-
mately 260 psig (1793 kPa), fan motor no. 2 is energized.
On demand for additional cooling capacity, the second stage
(TC2) of the cooling thermostat closes, energizing a field-
supplied liquid line solenoid valve (LLSV), which opens.
This increases the suction pressure, causing the compressor
to operate at higher capacity.
When fan switch is set at AUTO, the indoor-air fan cycles
with the compressor. When the switch is set at CONT, the
indoor-air fan runs continuously.
At shutdown, the Time Guard® II timer prevents the com-
pressor from restarting for approximately 5 minutes.
In addition, a field-supplied solenoid valve (locate at fan
coil) wired in parallel with the compressor contactor coil,
shuts off the liquid line to prevent the refrigerant migration
back to the compressor during the off cycle. This valve is
recommended for all installations and is mandatory if piping
length is over 75 ft (22.9 m) or if liquid line diameter ex-
ceeds
5
⁄
8
in. (38AKS013, 014) or
7
⁄
8
in. (38AKS016, 024). If
two liquid line solenoid valves are used, add accessory relay-
transformer package 38AE900001 (60 Hz only).
38AKS013-024
Air-Cooled Condensing Units
50/60 Hz
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
3a 2a
PC 111
Catalog No. 563-820
Printed in U.S.A.
Form 38AKS-2W
Pg 1
8-96
Replaces: New
Summary of Contents for 38AKS013-024
Page 3: ...Fig 1 Power and Control Circuit Schematics 208 230 380 3 60 230 346 400 3 50 SCHEMATIC 3...
Page 4: ...Fig 2 Component Arrangement 208 230 380 3 60 230 346 400 3 50 COMPONENT ARRANGEMENT 4...
Page 5: ...Fig 3 Power and Control Circuit Schematics 460 575 3 60 SCHEMATIC 5...
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