Carrier 50TCA04-A07 - Manual (Page 21)

21
The High Static option supply fan motor is equipped with
a pilot--circuit Thermix combination
overtemperature/overcurrent protection device. This
device resets automatically. Do not bypass this switch to
correct trouble. Determine the cause and correct it.
Condenser Fan Motor Protection
The condenser fan motor is internally protected against
overtemperature.
Relief Device
A soft solder joint at the suction service access port
provides pressure relief under abnormal temperature and
pressure conditions (i.e., fire in building). Protect this
joint during brazing operations near this joint.
Control Circuit, 24--V
The control circuit is protected against overcurrent
conditions by a circuit breaker mounted on control
transformer TRAN. Reset is manual.
ELECTRIC HEATERS
50TC 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 Figs 27 -- 29.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL OUTDOOR
ACCESS PANEL
INDOOR
ACCESS
PANEL
C08133
Fig. 27 -- Typical Access Panel Location (3--6 Ton)
DISCONNECT
MOUNTING
LOCATION EMT OR RIGID CONDUIT
(FIELD-SUPPLIED) SINGLE
POINT BOX CENTER
POST
HEATER
COVERS
HEATER
MOUNTING
BRACKET HEATER
MODULE
(LOCATION 2) HEATER
MODULE
(LOCATION 1)
SINGLE POINT
BOX
MOUNTING
SCREW
BRACKET AND
CONDUIT
DRIP BOOT MAIN
CONTROL
BOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RESET
LIMIT SWITCH
C08134
Fig. 28 -- Typical Component Location
TRACK
FLANGE
C08135
Fig. 29 -- Typical Module Installation
Not all available heater modules 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 re approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 4 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1) and a
bare heater model number (value is 0).
Table 4 – Heater Model Number
Bare Heater Model
Number
C R H E A T E R 0 0 1 A 0 0
Heater Sales Package
PNO
Includes:
Bare Heater
Carton and packing
materials
Installation sheet
C R H E A T E R 1 0 1 A 0 0
50TC