Reznor JT4BD Unit Installation Manual - Manual (Page 6)

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• Overcurrent protection must be provided at the branch
circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes.
See the unit rating plate for minimum circuit ampacity
and maximum overcurrent protection limits.
• Provide power supply for the unit in accordance with the
unit wiring diagram, and the unit rating plate. Connect
the line-voltage leads to the terminals on the contactor
inside the control compartment.
• Use only copper wire for the line voltage power supply
to this unit as listed in Table 1 (page 4). Use proper
code agency listed conduit and a conduit connector
for connecting the supply wires to the unit. Use of rain
tight conduit is recommended.
• 208/230 Volt units are shipped from the factory wired
for 230 volt operation. For 208V operation, remove the
lead from the transformer terminal marked 240V and
connect it to the terminal marked 208V.
• Optional equipment requiring connection to the power
or control circuits must be wired in strict accordance
of the NEC (ANSI/NFPA 70), applicable local codes,
and the instructions provided with the equipment.
comfort alert tM Diagnostics Module
(Select Models only)
The Comfort Alert TM Diagnostics Module (Figure 4) is a
breakthrough innovation for troubleshooting heat pump
and air conditioning system failures. The module installs
easily in the electrical box of the outdoor unit near the
compressor contactor. By monitoring and analyzing data
from the Copeland scroll compressor and the thermostat
demand, the module can accurately detect the cause of
electrical and system related failures without any sensors.
A flashing LED indicator communicates the ALERT code
and a diagnostic key is also imprinted on the side of the
module to quickly direct the technician to the root cause
of a problem. notE: This module does not provide safety
protection! The Comfort Alert TM Diagnostics Module is a
monitoring device and cannot control or shut down other
devices.
24 VAC Power Wiring
The Comfort Alert TM module requires a constant nominal
24 VAC power supply. The module cannot be powered by
the c terminal on a defrost board or other control board
without experiencing nuisance alerts. notE: The wiring
to the module’s r & c terminals must be routed directly
from the indoor unit or thermostat.
If the constant 24 VAC (r wire) is not present in the outdoor
unit, use one of the spare wires in the thermostat cable to
bring power to the module. Connect the other end of the
spare wire to r at the indoor unit or thermostat.
Thermostat Demand Wiring
The Comfort Alert TM module requires a thermostat demand
signal to operate properly. The thermostat demand
signal input (labeled Y on the module), should always be
connected to the compressor contactor coil. notE: When
the coil is energized, the demand signal input is 24 VAC.
When the coil is not energized, the demand signal input
should be less than 0.5 VAC.
notES:
• Factory installed modules have different thermostat
demand signal wiring. Always follow manufacturer
wiring instructions when replacing the module.
• After the thermostat demand signal is connected, verify
that 24 VAC across Y & c when demand is present.
Interpreting the Diagnostic LED’s
When an abnormal system condition occurs, the Comfort
Alert
TM module displays the appropriate ALERT and/or
TRIP LED will flash a number of times consecutively,
pause and then repeat the process. To identify a Flash
Code number, count the number of consecutive flashes.
Each time the module powers up, the last ALERT Flash
Code that occurred prior to shut down is displayed for
one minute. The module will continue to display the LED
until the condition returns to normal or if 24 VAC power
is removed from the module. See Table 17 (page 26) for
flash code identification or Table 18 (page 27) for module
wiring troubleshooting.
LED Description
• POWER LED (Green): indicates voltage is present at
the power connection of the module.
• ALERT LED (Yellow): communicates an abnormal
system condition through a unique flash code.
notE: The ALERT LED will flash consecutively, pause
and then repeat the process. The number of consecutive
flashes, referred to as the Flash Code, correlates to
a particular abnormal condition. Detailed descriptions
of these ALERT Flash Codes are listed in Table 17.
• TRIP LED (Red): indicates a demand signal is received
from the thermostat, but current to the compressor is
Figure 4. comfort alert tM Diagnostics Module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key