Unit Without Thru- - Base Conversion Kit; Heat Anticipator Settings; Electric Heaters - Carrier 50TCQD14 Installation Instructions Manual

Defrost — The defrost control mode is a time/temperature
sequence. There are
continuous run period and the test/defrost cycle period.
The temperature component is provided by Defrost
Thermostat 1 and 2 (DFT1 and DFT2) mounted on the
outdoor coil.
The continuous run period is a fixed time period between the
end of the last defrost cycle (or start of the current Heating
cycle) during which no defrost will be permitted. This period
can be set at 30, 60, 90 or 120 minutes by changing the
positions of DIP switches SW1 and SW2 (see Fig. 37 and
Table 6). The default run period is 60 minutes for size 14
units.
Fig. 37 - - DIP Switch Settings — Defrost Board
Shorting the jumpers for a period of 5 to 20 seconds
bypasses the remaining continuous run period and places
the unit in a Forced Defrost mode. If the controlling DFT
is closed when this mode is initiated, the unit will
complete a normal defrost period that will terminate when
the controlling DFT opens or the 10 minute defrost cycle
limit is reached. If the controlling DFT is open when this
mode is initiated, the Defrost cycle will run for 30
seconds. Both modes end at the end of the Defrost cycle.
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 removing one of the two
knockouts in the corner of the box. Using 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 connector at the control box and the wire tie to
ensure that the thermostat wire is tight and will not be
damaged by contact with the condenser coil. See Fig. 38.
NOTE: If thru- - the- - bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
two time components: The
a50--- 9688
Fig. 38 - - Thermostat Wire Routing
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.

Electric Heaters

50TCQ units may be equipped with field- - installed
accessory electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance
wires strung through ceramic insulators, line- - break limit
switches and a control contactor. One or two heater
modules may be used in a unit.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 39.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Not all available heater modules and single point
boxes may be used in every unit. Use only those
heater modules that are UL listed for use in a specific
size unit. Refer to the label on the unit cabinet for the
list of approved heaters and single point boxes.
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C10018