INSTALL CONTROL POWER WIRING — Wire the Motor-
master® low-ambient control to the unit’s power circuit as
shown in Fig. 14 and 15; refer to the following sections for
various unit voltages.
Wire low-ambient control in series with fan motor.
Power wiring must comply with all local and national re-
quirements. All units except 460-v, 3-ph, 60 Hz use Motor-
master control, Carrier Part No. 32LT900301. The 460-v units
use Motormaster control, Carrier Part No. 32LT900611.
ALL UNITS EXCEPT 575-3-60 — For these units, without
special transformer, wire Motormaster control to condenser
fan motor circuit as shown in Fig. 14.
575-3-60 UNITS — The 575-v units require a special field-
installed transformer and fan motor. Wire special trans-
former (part no. HT01AH859) and Motormaster control to
special fan motor (part no. HC44VL610) as shown in Fig. 15.
Blue wire from CB1-13 to CAP1 must be reconnected from
CB1-13 to TRAN2-H2.
Blue wire from CAP1 to TRAN2-H2 must be recon-
nected from CAP1 to field-installed transformer.
VERIFY OPERATION — Turn on the unit power and set
the thermostat below the ambient room temperature. If the
unit is equipped with a Time Guard® II circuit, wait at least
5 minutes.
After the compressor starts, the fan speed is modulated
according to the condensing temperature and then main-
tained until the set point is achieved.
If fan motor no. 1 does not start, verify the following con-
ditions and correct as necessary:
• Condensing unit power is on.
• Power is present at fan motor relay contacts (or trans-
former output output when one is installed).
• Sensor wire connections inside the low-ambient control
are tight.
If the preceding conditions are met and fan motor no. 1
still does not start, perform corrective procedures or replace
components as follows:
• Jumper the power wires (BLK-to-BLK) in the Motor-
master control. If the motor does not run, check motor wir-
ing and run capacitor. Replace capacitor and motor if nec-
essary. If the motor runs, ensure the fan motor is wired in
series with the control. Refer to Fig. 14.
• If the fan motor runs when connected to the single-phase
voltage supply but does not run when connected in series
with the Motormaster control, AND the return bend where
the sensor is mounted is warm, short the sensor leads (BLU-
to-RED). If the motor runs, replace the sensor. If the mo-
tor does not run, replace the control and sensor assembly.
Fig. 12 — Location of Low-Ambient Kit Sensors
Fig. 13 — Sensor Installation
*Use control part no. 32LT900301 for all unit voltages except 460 V.
Use control part no. 32LT900611 for 460 V units.
Fig. 14 — Motormaster Control Power Wiring
for All Units except 575-V
Fig. 15 — Motormaster Control Power Wiring for 575-V
Units Using 208/230-V Motors
12
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...
Page 14: ......
Page 15: ......
