Table of Contents
Advertisement
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. 32 — Powered Convenience Outlet Wiring
Duty Cycle
The unit-powered convenience outlet has a duty cycle limitation.
The transformer is intended to provide power on an intermittent
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 loading 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 internal 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.
1. Third-party trademarks and logos are the property of their respective
owners.
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 re-
quire 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 50FCQ units equipped with electro-mechanical controls or the
optional factory-installed RTU Open controller, the Defrost Con-
trol Board (DFB) coordinates thermostat demands for supply fan
control, 1 or 2 stage cooling, 2 stage heating, emergency heating
and defrost control with unit operating sequences. The DFB also
provides an indoor fan off delay feature (user selectable). See
Fig. 33 for board arrangement.
The DFB is located in the main control box of the 50FCQ unit (see
Fig. 34). All connections are factory-made through harnesses to
the UCB (unit control board) to the ECM (direct-drive motor), re-
versing valve solenoids, and to defrost thermostats. Refer to
Table 7 for details of DFB Inputs and Outputs.
NOTE: The Defrost Control Board is not used on units equipped
with the factory-installed SystemVu™ controller option.
Fig. 33 — Defrost Control Board Arrangement
22
DIP
Switches
Speed-Up
Jumpers
Advertisement
Table of Contents
Troubleshooting
