Carrier WeatherMaker 48TC Series Installation Instructions Manual page 37

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1 / " ELECTRICAL
2
BULKHEAD
CONNECTOR
Fig. 64 — Thru-the-Base Option, Shipping Position
(Size 16)
1. Remove the "L" bracket assembly from the unit.
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 connector 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,
aligning the holes in the gasket to the holes in the basepan.
See Fig. 65.
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.
CONNECTOR
PLATE
ASSEMBLY
GASKET
Fig. 65 — Completing Installation of Thru-the-Base
Option (Size 16)
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 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 connections can be made.
Connect the control power conduit to the unit control box at this
hole.
Units Without Thru-Base 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. 47.
Field Control Wiring
1 / " ELECTRICAL
2
The 48TC**16 requires an external temperature control device.
BULKHEAD
CONNECTOR
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
for Building Management Systems using non-CCN protocols
(RTU Open is available as a factory-installed option only).
Thermostat
Install a Carrier-approved accessory 2-stage Cooling/Heating ther-
mostat according to installation instructions included with the ac-
cessory. If using an electronic thermostat, configure it for "non-
heat pump" operation. Locate the thermostat accessory on a solid
wall in the conditioned space to sense average temperature in ac-
cordance with the thermostat installation 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
95°F (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 insulat-
ed 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
Pass the thermostat control wires through the bushing on the unit
end panel. Route the wire through the snap-in wire tie and up to
the web bushing near the control box. Route the wire through the
bushing and into the bottom left side of the control box after re-
moving one of the two knockouts in the corner of the box. Use a
connector at the control box to protect the wire as it passes into the
control box. Pull the wires over to the terminal strip at the upper
left corner of the Central Terminal Board (CTB). Use the connec-
tor at the control box and the wire tie to take up any slack in the
thermostat wire to ensure that it will not be damaged by contact
with the condenser coil. See Fig. 66.
Fig. 66 — Thermostat Wire Routing (Size 16)
NOTE: If thru-the-bottom connections accessory is used, refer to
the accessory installation instructions for information on routing
power and control wiring.
Heat Anticipator Settings
Set heat anticipator settings at 0.14 amp for the first stage and 0.14
amp for second-stage heating, when available.
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or as a stand-alone control) or the RTU Open Controller
®
Thermostat Wire