Duty Cycle; Maintenance; Fuse On Powered Type; Commerical Defrost Control - Bryant 547K 04-07 Series Service And Maintenance Instructions

UNIT CONNECT
VOLTAGE AS CONNECTIONS
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. 31 — 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
renewable screw-in (Edison base) type plug fuse.
PRIMARY TRANSFORMER
TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
™1 Fusetron ™1 T-15, non-
USING UNIT-MOUNTED CONVENIENCE OUTLETS
Units with unit-mounted convenience outlet circuits will often
require that 2 disconnects be opened to de-energize all power
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.

COMMERICAL DEFROST CONTROL

On 547K units equipped with electro-mechanical controls or
the optional factory-installed RTU Open controller, the Defrost
Control Board (DFB) coordinates thermostat demands for sup-
ply fan control, 1 or 2 stage cooling, 2 stage heating, emergen-
cy heating and defrost control with unit operating sequences.
The DFB also provides an indoor fan off delay feature (user se-
lectable). See Fig. 32 for board arrangement.
The DFB is located in the main control box of the 547K unit
(see Fig. 33). All connections are factory-made through har-
nesses to the UCB (unit control board) to the ECM (direct-
drive motor), reversing valve solenoids, and to defrost thermo-
stats. Refer to Table 7 for details of DFB Inputs and Outputs.
Fig. 32 — Defrost Control Board Arrangement
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