Electric Heaters - Carrier WeatherMaster 50HCQ04-12 Service And Maintenance Instructions

ELECTRIC HEATERS

The 50HCQ units can be equipped with field-installed accesso-
ry electric heaters. The heaters are modular in design, with
heater frames holding open coil resistance wires strung through
ceramic insulators and control contactor(s), using a combina-
tion of 24v control side break/auto-reset or line-break/auto-re-
set limit switches and a pilot-circuit/manual reset limit switch
to protect the unit against over-temperature situations. One or
two heater modules can be used in a unit.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
Fig. 37 — Typical Access Panel Location (3-6 Ton)
Heater modules are installed in the compartment below the in-
door (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. 37-39.
Not all available heater modules can be used in every unit. Use
only those heater modules that are UL listed for use in a specif-
ic size unit. Refer to the label on the unit cabinet re approved
heaters.
Unit heaters are marked with Heater Model Numbers. Howev-
er, 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 Pack-
age part number.
BARE HEATER
C
MODEL NUMBER
Heater Sales Package
P/N includes:
Bare Heater
C
Carton and packing
materials
Installation sheet
INDOOR
OUTDOOR
ACCESS
ACCESS PANEL
PANEL
Table 10 — Heater Model Number
R H E A
R H E A
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. 38 — Typical Component Location
Fig. 39 — Typical Module Installation
T E R 0
T E R 1
24
SINGLE CENTER MANUAL RESET
POINT BOX POST LIMIT SWITCH
HEATER HEATER
MODULE MODULE
(LOCATION 1) (LOCATION 2)
CONTROL WIRE TERMINAL BLOCK
0 1 A 0
A
0 1 OR 0
B
HEATER
COVERS
HEATER
MOUNTING
BRACKET
TRACK
FLANGE
0
0