Carrier 50TCQD17-D24, Service And Maintenance Instructions, Page: 19 / 60

19
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 15 amps loading
for continuous duty loads (such as electric heaters for
overnight use). Observe a 50% limit on circuit loading
above 8 amps (i.e., limit loads exceeding 8 amps to 30
minutes of operation every hour).
Test the GFCI receptacle by pressing the TEST button on
the face 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.
CO8283
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208,
230
240
L1: RED +YEL
L2: BLU + GRA
H1 + H3
H2 + H4
460 480
L1: RED
Splice BLU + YEL
L2: GRA
H1
H2 + H3
H4
575 600
L1: RED
L2: GRA
H1
H2
Fig. 28 -- Powered Convenience Outlet Wiring
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.
The Fuse on the powered type — The factory fuse is a
Cooper Bussmann

Fusetron

T--15, non--renewable
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
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.
HEAT PUMP CONTROLS
Central Terminal Board
The Central Terminal Board (CTB) is a large printed
circuit board that is located in the center of the unit
control box. This printed circuit board contains multiple
termination strips and connectors to simplify factory
control box wiring and field control connections.
Terminals are clearly marked on the board surface. See
Fig 29.
The CTB contains no software and no logic. But it does
include seven configuration jumpers that are cut to
configure the board to read external optional and
accessory controls, including the unit is a heat pump.
C09274
Fig. 29 -- Central Terminal Board (CTB)
Table 5. Jumper Configuration
Jumper Control Function Note
JMP1 Phase Monitor
JMP2 Occupancy Control
JMP3 Smoke Detector Shutdown
JMP4 Remote Shutdown
JMP5 Heat Pump / Reheat 50TCQ default: Cut
JMP6 Heat Pump / Reheat 50TCQ default: Cut
JMP7 Heat Pump / Reheat 50TCQ default: Cut