Factory-Option Thru-Base Connections (Electrical Connections) - Carrier WeatherExpert 48JC04 Installation Instructions Manual

UNIT CONNECT
VOLTAGE AS
208, 230
240
460
480
575
600
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
er fitting (brass), a / -in. electrical bulkhead connector, and a
1
2
/ -in. electrical bulkhead connector, all factory-installed in the
3
4
embossed (raised) section of the unit basepan in the condenser
section. The / -in. bulkhead connector enables the low-voltage
3
4
PRIMARY TRANSFORMER
CONNECTIONS TERMINALS
L1: RED + YEL H1 + H3
L2: BLU + GRA H2 + H4
L1: RED H1
Splice BLU + YEL H2 + H3
L2: GRA H4
L1: RED H1
L2: GRA H2
/ -in. NPT gas adapt-
1
2
control wires to pass through the basepan. The
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
Fig. 27 on page 17.
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.
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.
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 sensing and communication tie in. Space temperature can
2
be also be written to from a building network or zoning system.
20
/ -in. electrical
1
2
average voltage
681
= = 227
3 3
4
= 1.78%
227