Fan Motor Starter; Wiring; Start-Up And Test; Disconnect - Carrier 39LA-25 Installation, Start-Up And Service Instructions Manual

Fan Motor Starter

When starter is factory-installed, it is wired to the motor and fully
tested before shipping. Before proceeding, open the starter cover
and fan section access door to check for any damage.

WIRING

1. Select a suitable location for the field power supply source;
top is preferred.
2. Before drilling any hole, be sure the hole and any field-
supplied conduit fittings will not interfere with the door or
components inside the enclosure.
3. Drill the appropriate size hole and connect the field-supplied
conduit to the enclosure.
4. Refer to the wiring diagram supplied with the starter and con-
nect the line voltage power source to the line voltage termi-
nals (L1, L2, L3) as shown.
5. Refer to the factory-supplied voltage warning label and verify
that the power source is correct.
6. Connect the grounding wire to the grounding lug provided on
the bottom of the starter.
NOTE: For remote control operation (AUTO position),
fire/smoke shutdown, or shutdown on coil freeze protection, a
second conduit should be used to connect these control func-
tions.
IMPORTANT: This starter is designed to stop the equip-
ment in both HAND and AUTO positions if either a
fire/smoke or coil freeze condition is detected.
1. Select a location at the bottom of the starter near the control
terminal block.
2. Before drilling any hole, be sure the hole and any field-sup-
plied conduit fittings will not interfere with the door or com-
ponents inside the enclosure.
3. Drill the appropriate size hole and connect the field-supplied
conduit to the enclosure.
4. If a smoke detector or remote fire shut down is provided
(field-supplied), remove the factory-supplied jumper between
terminals 1 and 2 in the starter. Connect the normally closed,
isolated dry contact from the smoke detector or fire system to
these terminals.
5. If a coil freeze detection thermostat is provided, remove the
factory-supplied jumper between terminals 1 and 2 in the
starter. Connect the normally closed contact from the low
temperature thermostat to these terminals.
6. For remote start/stop
[hand/auto/off] switch is placed in the AUTO position), con-
nect a field-supplied, normally open isolated dry contact
between terminals 3 and 4. This contact must be suitable for
at least 3 amps at 120 vac.

START-UP AND TEST

Before applying power to the starter, verify that the motor over-
load inside the starter is set to the full load amperage (FLA or
RLA) specified on the motor nameplate.
IMPORTANT: Many starters contain a multi-tap control
transformer. The line voltage tap on the control trans-
former must be set in the field. For starters operating at
200/230-50 Hz, 208/230-60 Hz, or 380/400/415-50 Hz,
the line voltage tap on the control transformer must be set
to the appropriate line input voltage.
operation (when the HOA
1. Set the HOA switch on the front of the starter to the OFF
position.
2. Verify that the fan can freely rotate and remove any loose
items inside the fan section.
3. Close and secure the fan access door or panel and the starter
door cover.
4. Apply power to the starter.
5. Set the HOA switch in the HAND position and verify that the
fan operates.
6. For 3-phase motors:
Place the switch back in the OFF position and carefully open
the fan access door.
7. Verify that the fan wheel is rotating in the proper direction. If
it is not, remove power and reverse any two of the line volt-
age connections at the starter terminals (L1, L2, L3).
8. With the fan operating and the starter in the HAND position,
verify that each safety or limit switch functions properly.
9. Repeat Step 6 with the switch in the AUTO position and the
remote contact energized.

Disconnect

When disconnect is factory-installed, it is wired to the motor, and
fully tested before shipped. Open the disconnect cover and fan
section access door to check for damage before proceeding.

DISCONNECT WIRING

1. Connect the field line voltage power source to the top of the
disconnect (knockouts are provided).
2. Remove the knockouts as required to accommodate the field-
supplied conduit.
3. Refer to the wiring diagram supplied with the unit and con-
nect the line voltage power source to the line voltage termi-
nals (L1, L2, L3) as shown.
4. Refer to the factory-supplied voltage warning label and verify
that the power source is correct.
5. Connect the ground wire to the grounding lug provided in the
disconnect.
START-UP AND TEST
1. Set the disconnect switch to the OFF position.
2. Verify that the fan can freely rotate and remove any loose
items inside the fan section.
3. Close and secure the fan access door and the disconnect door
cover.
4. Apply power.
5. Set the disconnect switch to the ON position and verify that
the fan operates.
6. For 3-phase motors:
Place the switch back in the OFF position and carefully open
the fan access door.
7. Verify that the fan wheel is rotating in the proper direction. If
it is not, remove power and reverse any two of the line volt-
age connections at the starter terminals (L1, L2, L3).
NOTE: For fused type disconnects, blown fuses MUST be
replaced with the same type and size originally supplied.
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