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connector allows the high-voltage power wires to pass through the
basepan. See Fig. 29 and 30.
Fig. 28 — Thru-the-Base Fitting Assembly (Shown in
Shipping Position)
Fig. 29 — Thru-Base Connection Fittings (Units Built
Prior to 4/15/2019)
HIGH VOLTAGE
CONDUIT
CONNECTOR
AUXILIARY
POWER SUPPLY
(OPTIONAL)
Fig. 30 — Thru-Base Connection Fittings (Units Built
On and After 4/15/2019)
1.
Remove the "L" bracket assembly from the unit.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
LOW VOLTAGE
CONDUIT
CONNECTOR
2.
Remove connector plate assembly from the "L" bracket and
discard the "L" bracket, but retain the washer head screws
and the gasket (located between the "L" bracket and the con-
nector plate assembly).
NOTE: Take care not to damage the gasket, as it is reused in the
following step.
3.
Place the gasket over the embossed area in the basepan, align-
ing the holes in the gasket to the holes in the basepan. See
Fig. 28.
4.
Install the connector plate assembly to the basepan using 8 of
the washer head screws.
NOTE: If electrical connections are not going to occur at this time,
tape or otherwise cover the fittings so that moisture does not get
into the building or conduit in the interim.
Check tightness of connector lock nuts before connecting electri-
cal conduits.
Field-supplied and field-installed liquid-tight conduit connectors
and conduit may be attached to the connectors on the basepan.
Pull correctly rated high voltage and low voltage through
appropriate conduits. Connect the power conduit to the internal
disconnect (if unit is so equipped) or to the external disconnect
(through unit side panel). Remove one of the two knockouts
located on the bottom left side of the unit control box. Use this
hole for the control conduit.
UNITS WITHOUT THRU-BASE CONNECTIONS (ELEC-
TRICAL CONNECTIONS)
1.
Install power wiring conduit through side panel openings.
Install conduit between disconnect and control box.
2.
Install power lines to terminal connections as shown in
Fig. 23 on page 16.
Voltage to compressor terminals during operation must be within
voltage range indicated on unit nameplate. On 3-phase units, volt-
ages between phases must be balanced within 2% and the current
within 10%. Use the formula shown in the example below to de-
termine the percent of 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.
max voltage deviation from average voltage
% Voltage
= 100 x
Imbalance
Example: Supply voltage is 230-3-60
AB = 224 v
A
B
C
BC = 231 v
AC = 226 v
MOTOR
(224 + 231 + 226)
Average Voltage
=
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100x
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
18
average voltage
681
=
=
227
3
3
4
= 1.78%
227
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