20
Fig. 36 —
Powered Convenience Outlet Wiring
HACR AMP RATING
The amp rating of the HACR factory-installed option is based
on the size, voltage, indoor motor and other electrical options
of the unit as shipped from the factory. If field-installed acces
-
sories are added or changed in the field (for example, power
exhaust, ERV), the HACR may no longer be of the proper amp
rating and therefore will need to be removed from the unit. See
unit nameplate and label on factory-installed HACR for the
amp rating of the HACR that was shipped with the unit from
the factory (Fig. 37). See unit nameplates for the proper fuse,
HACR or maximum over-current protection device required on
the unit with field-installed accessories.
Fig. 37 —
HACR Caution Label
FACTORY-OPTION THRU-BASE CONNECTIONS (ELEC
-
TRICAL CONNECTIONS)
This service connection kit consists of a
1
/
2
-in. NPT gas adapt
-
er fitting (brass), a
1
/
2
-in. electrical bulkhead connector, and a
3
/
4
-in. electrical bulkhead connector, all factory-installed in the
embossed (raised) section of the unit basepan in the condenser
section. The
3
/
4
-in. bulkhead connector enables the low-voltage
control wires to pass through the basepan. The
1
/
2
-in. electrical
bulkhead connector allows the high-voltage power wires to
pass through the basepan. See Fig. 16 on page 13.
Check tightness of connector lock nuts before connecting elec
-
trical conduits.
Field-supplied and field-installed liquid tight conduit connec
-
tors and conduit may be attached to the connectors on the base
-
pan. 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). A hole must be field cut in the main
control box bottom on the left side so the 24-v control connec
-
tions can be made. Connect the control power conduit to the
unit control box at this hole.
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
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the following formula to de
-
termine the percent of voltage imbalance. Operation on im
-
proper line voltage or excessive phase imbalance constitutes
abuse and may cause damage to electrical components. Such
operation would invalidate any applicable Carrier warranty.
Example: Supply voltage is 230-3-60
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.
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
FIELD CONTROL WIRING
The 48JC unit comes standard with SystemVu controls. An ex
-
ternal space sensor or conventional thermostat is required
(field-supplied).
SPACE TEMPERATURE SENSOR (SPT)
There are 2 types of space temperature sensors available from
Carrier, resistive input non-communicating (T-55, T-56 and
T
-
59) and Rnet communicating (ZS) sensors. Each type has a
variety of options consisting of: timed override button, set
point adjustment, a LCD screen, combination of humidity or
CO
2
sensing and communication tie in. Space temperature can
be also be written to from a building network or zoning system.
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208, 230
240
L1: RED + YEL
L2: BLU + GRA
H1 + H3
H2 + H4
460
480
L1: RED
Splice BLU + YEL
L2: GRA
H1
H2 + H3
H4
575
600
L1: RED
L2: GRA
H1
H2
% Voltage
Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage
=
(224 + 231 + 226)
=
681
=
227
3
3
% Voltage Imbalance = 100x
4
= 1.78%
227
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
A
B
C
MOTOR
Summary of Contents for WeatherExpert 48JC04
Page 4: ...4 Fig 2 Unit Dimensional Drawing ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing cont ...
Page 6: ...6 Fig 2 Unit Dimensional Drawing cont ...
Page 24: ...24 Fig 46 48JC 04 06 Control Wiring Diagram ...
Page 25: ...25 Fig 47 48JC 04 06 Power Wiring Diagram 208 230 460V Unit Shown ...
Page 26: ...26 Fig 48 48JC 04 06 Power Wiring Diagram 575V Unit Shown ...
Page 32: ......
Page 33: ......