Electric Heaters - Carrier 50TCQ 04 Series Service And Maintenance Instructions

Switch No.
1 2
1
J J
0
90 minutes
Shorting the jumpers for a period of 5 to 20 secs 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 secs. Both
modes end at the end of the Defrost cycle.

ELECTRIC HEATERS

50TCQ units can 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 can be used in a unit.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
Fig. 36 − Typical Access Panel Location (3−6 Ton)
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. 36, Fig. 37 and Fig. 38.
Not all available heater modules can 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.
Table 9 – Dip Switch Position
1 2
J
1 1
J
0 0
60 minutes
INDOOR
OUTDOOR ACCESS
ACCESS PANEL
PANEL
C08133
1 2 1
J J
1
J
0
30 minutes 120 minutes
Unit heaters are marked with Heater Model Numbers.
However, heaters are ordered as and shipped in cartons
marked with a corresponding heater Sales Package part
number. See Table 10 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).
DISCONNECT EMT OR RIGID CONDUIT
MOUNTING (FIELD-SUPPLIED)
LOCATION
SINGLE POINT
MAIN BRACKET AND BOX
CONTROL CONDUIT MOUNTING
BOX DRIP BOOT SCREW
Fig. 37 − Typical Component Location
Fig. 38 − Typical Module Installation
28
2 3
J
1
J
0
Fan Delay
SINGLE CENTER MANUAL RESET
POINT BOX POST LIMIT SWITCH
HEATER HEATER
MODULE MODULE
(LOCATION 1) (LOCATION 2)
CONTROL WIRE TERMINAL BLOCK
On
Off
HEATER
COVERS
HEATER
MOUNTING
BRACKET
C08134
TRACK
FLANGE
C08135