Carrier WeatherMaker 50FCQ 14 Series Installation Instructions Manual page 19

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 de-
frost 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.
ELECTRIC HEATERS
The 50FCQ size 14 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.
Heater modules are installed in the compartment below the indoor
(supply) fan outlet. Access is through the electric heat access
panel. See Fig. 36-38.
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
Control Box
Non-Fused
Disconnect*
Convenience
Outlet*
* Factory-Installed Option.
size unit. Refer to the label on the unit cabinet for the list of ap-
proved heaters.
Refer to the Small Roof Top Units Accessory Electric Heater and
Single Point Box installation instructions for further details.
Single
Point Box
Control Wire
Terminal Block
Fig. 37 — Component Location
Fig. 38 — Heater Module Installation
19
Fig. 36 — Access Panel Location
Center Vane Axial
Post Indoor Fan System
Heater
(Cover Removed)
Heater Module
Manual Reset
Limit Switch
Heater Mounting
Bracket