Carrier 48TC D/E17 Series, Installation Instructions Manual

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Unit-powered type
A unit-mounted transformer which is factory-installed to step-
down the main power supply voltage to the unit to 115-v at the du-
plex 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. 38.
The primary leads to the convenience outlet transformer are not
factory-connected. 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 provide service
power to the unit when the unit disconnect switch is open. See
Fig. 38. See Fig. 39 for convenience outlet utilization precautions.
Fig. 38 — Powered Convenience Outlet Wiring
.
Fig. 39 — Convenience Outlet Utilization Notice
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 RESET 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 de-energization is confirmed. Observe National Elec-
trical Code Article 210, Branch Circuits, for use of convenience
outlets.
FACTORY-OPTION THRU-BASE CONNECTIONS (ELEC-
TRICAL CONNECTIONS)
All units are equipped with the ability to bring utilities through the
base.
Gas is brought up through an embossed area located in the gas
section behind the gas entrance post. Access is gained through the
gas access panel. A knock out must be removed to accomplish
this.
The electrical entrance is located in the control box area and can
be accessed through the control box access panel. An embossed
area is provided with three knock outs. High voltage is brought
through the multi knock out by removing the appropriate size for
the size of the fitting required. A 7 /
8
-in. knock out is provided for
low voltage. An additional 7 /
8
-in. knock out is provided for a 115
volt line which is used when the unit is equipped with the non-unit
powered convenience outlet option.
All required fittings are field supplied. Install fittings when access
to both top and bottom of the base pan is available. See electrical
and gas connections for routing and connection information.
Units Without Thru-Base Connections
1. Install liquid tight conduit between disconnect and control
box.
2. Pull correctly rated high voltage wires through the conduit.
3. Install power lines to terminal connections as shown in
Fig. 35.
Field Control Wiring
The 48TC unit requires an external temperature control device.
This device can be a thermostat (field-supplied) or a PremierLink
controller (available as factory-installed option or as field-installed
accessory, for use on a Carrier Comfort Network or as a stand
alone control) or the RTU Open for Building Management Sys-
tems using non-CCN protocols (RTU Open is available as a facto-
ry-installed option only).
Thermostat
Install a Carrier-approved accessory 2-stage thermostat according
to installation instructions included with the accessory. Locate the
thermostat accessory on a solid wall in the conditioned space to
sense average temperature in accordance with the thermostat in-
stallation instructions.
If the thermostat contains a logic circuit requiring 24-v power, use
a thermostat cable or equivalent single leads of different colors
with minimum of seven leads. If the thermostat does not require a
24-v source (no “C” connection required), use a thermostat cable
or equivalent with minimum of six leads. Check the thermostat in-
stallation 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 (American Wire
Gage) insulated wire (35°C minimum). For 50 to 75 ft (15 to
23 m), use no. 16 AWG insulated wire (35°C minimum). For over
75 ft (23 m), use no. 14 AWG insulated wire (35°C minimum). All
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.
Unit Without Thru-Base Connection Kit
Correctly rated low voltage wire can be routed through the rubber
grommet located on the corner post adjacent to the control box ac-
cess panel. Route wire through the grommet and then route the
wire behind the corner post utilizing the factory provided wire ties
secured to the control box. This will ensure separation of the field
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
2.0 50HE501288
NOTICE/AVIS
Convenience Outlet Utilization
Maximum Intermittent Use 15 - Amps
Maximum Continuous Use 8 - Amps
Observe a 50% limit on the circuit
Loading above 8 - Amps
Utilisation de la prise utilitaire
Usage intermittent maximum 15 - Amps
Usage continu maximum 8 - Amps
Observez une limite de 50% sur le circuit
Chargement au-dessus de 8 - Amps