Factory-Option Thru-Base Connections (Electrical Connections); Units Without Thru-Base Connections (Electrical Connections); Field Control Wiring; Thermostat - Carrier WeatherMaker 48FC04-07 Installation Instructions Manual

the building. Observe national and local codes when selecting
wire size, fuse or breaker requirements, and disconnect
switch size and location. Route 125v power supply conduc-
tors into the bottom of the utility box containing the duplex
receptacle.
Unit-Powered Convenience Outlet
A unit-mounted transformer is factory-installed to step
down the main power supply voltage to the unit to 115v at the
duplex receptacle. This option also includes a manual switch
with fuse, located in a utility box and mounted on a bracket
behind the convenience outlet; access is through the unit's
control box access panel. See Fig. 29.
The primary leads to the convenience outlet transformer
are not factory-connected. Selection of primary power source
is a customer option. If local codes permit, the transformer
primary leads can be connected at the line-side terminals on
the unit-mounted non-fused disconnect switch; this will pro-
vide service power to the unit when the unit disconnect
switch is open. Other connection methods will result in the
convenience outlet circuit being de-energized when the unit
disconnect switch is open. See Fig. 33.
UNIT CONNECT
VOLTAGE AS
L1: RED + YEL
208, 230 240
L2: BLU + GRA
L1: RED
460 480 Splice BLU + YEL
L2: GRA
L1: RED
575 600
L2: GRA
Fig. 33 — Powered Convenience Outlet Wiring
Fuse On Power Type
The factory fuse is a Bussman "Fusetron"
non-renewable screw-in (Edison base) type plug fuse.
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing if
the GFCI receptacle does not trip as required. Press the RE-
SET button to clear the tripped condition.
Using Unit-Mounted Convenience Outlets
Units with unit-mounted convenience outlet circuits will
often require that two disconnects be opened to de-energize
all power to the unit. Treat all units as electrically energized
until the convenience outlet power is also checked and
1. Bussman and Fusetron are trademarks of Cooper Technologies
Company.
PRIMARY TRANSFORMER
CONNECTIONS TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
1
de-energization is confirmed. Observe National Electrical
Code Article 210, Branch Circuits, for use of convenience
outlets.
FACTORY-OPTION
(ELECTRICAL CONNECTIONS)
This service connection kit consists of a
adapter fitting (brass), a
and a 3 / -in. electrical bulkhead connector, all factory-in-
4
stalled in the embossed (raised) section of the unit basepan in
the condenser section. The
the low-voltage control wires to pass through the basepan.
The 1 / -in. electrical bulkhead connector allows the high-volt-
2
age power wires to pass through the basepan. See Fig. 17 on
page 14.
Check tightness of connector lock nuts before connecting
electrical conduits.
Field-supplied and field-installed liquid tight conduit con-
nectors 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 exter-
nal 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 connections can be made. Connect the control power
conduit to the unit control box at this hole.
UNITS WITHOUT
(ELECTRICAL CONNECTIONS)
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control box.
2. Install power lines to terminal connections as shown in
Fig. 25 on page 16.

FIELD CONTROL WIRING

The 48FC unit requires an external temperature control de-
vice. This device can be a thermostat (field-supplied) or a
SystemVu™ controller (available as factory-installed option
for use on a Carrier Comfort Network
control) or the RTU Open Controller for Building Manage-
ment Systems using non-CCN protocols (RTU Open control-
ler is available as a factory-installed option only).

THERMOSTAT

Install a Carrier-approved accessory thermostat according
to installation instructions included with the accessory. For
complete economizer function, select a two-stage cooling
thermostat. Locate the thermostat accessory on a solid wall in
the conditioned space to sense average temperature in
accordance with the thermostat installation instructions. Typi-
cal low-voltage connections are shown in Fig. 34.
If the thermostat contains a logic circuit requiring 24v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the thermo-
stat does not require a 24v source (no "C" connection re-
T-15,
quired), use a thermostat cable or equivalent with minimum
of six leads. Check the thermostat installation instructions for
additional features which might require additional conductors
in the cable.
For wire runs up to 50 ft (15 m), use no. 18 AWG (Ameri-
can Wire Gage) insulated wire [95°F (35°C) minimum]. For
50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire [95°F
(35°C) minimum]. For over 75 ft (23 m), use no. 14 AWG in-
sulated wire [95°F (35°C) minimum]. Wire sizes larger than
no. 18 AWG cannot be directly connected to the thermostat
and will require a junction box and splice at the thermostat.
19
THRU-BASE CONNECTIONS
1 / -in. NPT gas
2
1 / -in. electrical bulkhead connector,
2
3 / -in. bulkhead connector enables
4
THRU-BASE CONNECTIONS
® or as a stand alone