21
Fig. 25 — 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 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.
THE FUSE ON THE POWERED TYPE
The factory fuse is a Cooper Bussman
1
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 two disconnects be opened to de-energize all power to
the unit. Treat all units as electrically energized until the con-
venience 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 26.
The CTB contains no software and no logic. But it does in-
clude seven configuration jumpers that are cut to configure the
board to read external optional and accessory controls, includ-
ing whether the unit is a heat pump.
Fig. 26 — Central Terminal Board (CTB)
Jumpers JMP5, JMP6 and JMP7 are located in notches across
the top of the CTB. See Fig. 26. These jumpers are factory cut
on all heat pump units. Visually check these jumpers to con-
firm that they have been cut.
PROTECTIVE CONTROLS
Compressor Protection
OVER-CURRENT
The compressor has internal line-break motor protection.
OVER-TEMPERATURE
The compressor has an internal protector to protect it against
excessively high discharge gas temperatures.
HIGH PRESSURE SWITCH
The system is provided with a high pressure switch mounted
on the discharge line. The switch is stem-mounted and brazed
into the discharge tube. Trip setting is 630 psig ± 10 psig (4344
± 69 kPa) when hot. Reset is automatic at 505 psig (3482 kPa).
1. Bussman and Fusetron are trademarks of Cooper Technologies
Company.
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
Table 7 — Jumper Configuration
JUMPER CONTROL FUNCTION NOTE
JMP1 Phase Monitor
JMP2 Occupancy Control
JMP3 Smoke Detector Shutdown
JMP4 Remote Shutdown
JMP5 Heat Pump / Reheat 50KCQ default: Cut
JMP6 Heat Pump / Reheat 50KCQ default: Cut
JMP7 Heat Pump / Reheat 50KCQ default: Cut
X
C
R
G
W2
W1
Y2
Y1
X
C
R
G
W2
W1
Y2
Y1
SPHSPL
CIRCUIT 1
LPS
HPS
CIRCUIT 2
RC
T-STAT
DDC T-STAT
DDC
OCCUPANCY
C
U
T
F
O
R
SMOKE ALARM
CUT FOR
SMOKE
DETECTOR
SMOKE
SHUT-
DOWN
REMOTE
SHUTDOWN
U
N
I
T
S
H
U
T
D
O
W
N
W
I
R
I
I
N
G
24V
OUT
CUT FOR
REMOTE
SHUTDOWN
SAT/OAT
CLO/COMP
ECON
REHEAT/HP
CONTROL BOARD
PMR
CLO/COMP
CUT
FOR PMR
CUT FOR
REHEAT/HP
CUT FOR
REHEAT/HP
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