Duty Cycle; Maintenance; Fuse On Powered Type; Electric Heaters - Carrier WeatherMaster 50HC04 Service And Maintenance Instructions

UNIT CONNECT
VOLTAGE AS
L1: RED +YEL
208, 230
240
L2: BLU + GRA
L1: RED
460
480 Splice BLU + YEL
L2: GRA
L1: RED
575
600
L2: GRA
Fig. 38 — Powered Convenience Outlet Wiring

Duty Cycle

The unit-powered convenience outlet has a duty cycle limita-
tion. The transformer is intended to provide power on an inter-
mittent basis for service tools, lamps, etc; it is not intended to
provide 15A loading for continuous duty loads (such as electric
heaters for overnight use). Observe a 50% limit on circuit load-
ing above 8A (i.e., limit loads exceeding 8A to 30 minutes of
operation every hour).

Maintenance

Periodically test the GFCI receptacle by pressing the TEST
button on the face of the receptacle. This should cause the in-
ternal circuit of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing if
the GFCI receptacle does not trip as required. Press the RESET
button to clear the tripped condition.

Fuse on Powered Type

The factory fuse is a Bussmann Fusetron
screw-in (Edison base) type plug fuse.
USING UNIT-MOUNTED CONVENIENCE OUTLETS
Units with unit-mounted convenience outlet circuits will often
require that two disconnects be opened to de-energize all pow-
er to the unit. Treat all units as electrically energized until the
convenience outlet power is also checked and de-energization
is confirmed. Observe National Electrical Code Article 210,
Branch Circuits, for use of convenience outlets.
1. Bussmann and Fusetron are trademarks of Cooper Technologies
Company.
PRIMARY TRANSFORMER
CONNECTIONS TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
1 T-15, non-renewable

ELECTRIC HEATERS

The 50HC 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 ce-
ramic insulators and control contactor(s), using a combination
of 24-v control side break/auto-reset or line-break/auto-reset
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.
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. 39-41.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
Fig. 39 — Typical Access Panel Location (3-6 Ton)
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 regarding ap-
proved heaters.
Unit heaters are marked with heater model numbers. However,
heaters are ordered with and shipped in cartons marked with a
corresponding heater sales package part number. See Table 6
for correlation between heater model number and sales pack-
age 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. 40 — Typical Component Location
21
OUTDOOR
ACCESS PANEL
SINGLE CENTER MANUAL RESET
POINT BOX POST LIMIT SWITCH
HEATER HEATER
MODULE MODULE
(LOCATION 1) (LOCATION 2)
CONTROL WIRE TERMINAL BLOCK
INDOOR
ACCESS
PANEL
HEATER
COVERS
HEATER
MOUNTING
BRACKET