Duty Cycle; Maintenance; Fuse On Power Type; Using Unit-Mounted Convenience Outlets - Carrier WeatherMaker 50TCQ 17-24 Series Service And Maintenance Instructions

UNIT CONNECT
VOLTAGE AS CONNECTIONS
L1: RED +YEL
240
208, 230
L2: BLU + GRA
L1: RED
480 Splice BLU + YEL
460
L2: GRA
L1: RED
600
575
L2: GRA
Fig. 28 — 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
15 amps loading for continuous duty loads (such as electric heat-
ers 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.

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 Power Type

The factory fuse is a Cooper Bussmann
newable screw-in (Edison base) type plug fuse.

Using Unit-mounted Convenience Outlets

Units with unit-mounted convenience outlet circuits will often re-
quire that two disconnects be opened to de-energize all power to
the unit. Treat all units as electrically energized until the conve-
nience outlet power is also checked and de-energization is con-
firmed. Observe National Electrical Code Article 210, Branch Cir-
cuits, for use of convenience outlets.
1. Bussmann and Fusetron are trademarks of Cooper Technologies
Company.
PRIMARY TRANSFORMER
TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
Fusetron T-15, non-re-
1

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 cir-
cuit 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. Jumpers JMP5, JMP6 and JMP7 are located in
notches across the top of the CTB. See Fig. 29. These jumpers are
factory cut on all heat pump units (see Table 6). Visually check
these jumpers to confirm that they have been cut.
Fig. 29 — Central Terminal Board (CTB)
Table 6 — Jumper Configuration
JUMPER CONTROL FUNCTION
Phase Monitor
JMP1
Occupancy Control
JMP2
Smoke Detector Shutdown
JMP3
Remote Shutdown
JMP4
Heat Pump / Reheat
JMP5
Heat Pump / Reheat
JMP6
Heat Pump / Reheat
JMP7
20
NOTE
50TCQ default: Cut
50TCQ default: Cut
50TCQ default: Cut