Reznor JT4BD Unit Installation Manual - Manual (Page 7)

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not detected by the module. The TRIP LED typically
indicates if the compressor protector is open or the
compressor has no power.
The scroll compressor’s r (run), c (common), and S
(start) wires are routed through the holes in the Comfort
Alert
TM module marked r, c, & S. notE: The common
wire does not need to be routed through the module for
it to operate.
Blower time Delay relay (Select Models)
A time delay relay may be provided with the unit and
must be installed in the indoor section. The relay will keep
the indoor blower running an additional 40 seconds for
increased cooling efficiency after the outdoor unit shuts off.
The relay has four terminals and one mounting hole.
• Connect terminal 1 to load side of blower relay.
• Connect terminal 2 to terminal
r of T’stat.
• Connect terminal 3 to common terminal at blower relay
or transformer.
• Connect terminal 4 to terminal
g on T’stat.
G R W 2C E O Y
Thermostat
Green
Red
Brown
G
R
W 2 Orange
Black
O Y
R
C
Air Handler Heat Pump OD
Section
Typical Heat Pump with Standard Air Handler
W 2
C
W
NOTE: Jumper
between W2 and E is
required when no
OD
T-Stat is used.
For 2-Stage
Heater
Kits
G R W 2C E O Y
Thermostat
Green
Red
White
G
R
Black
O Y
R
C
Air Handler Heat Pump OD
Section
Typical Heat Pump with
Outdoor Thermostat and Air Handler
W 2
C
W
E
Figure 5. typical thermostat connections
Thermostat / Low Voltage Connections
• Thermostat connections should be made in accordance
with the instructions supplied with the thermostat and
the indoor equipment. A typical installation with a heat
pump thermostat and air handler is shown in Figure 5.
• The outdoor unit is designed to operate from a 24 VAC
Class II control circuit. The control circuit wiring must
comply with the current provisions of the NEC (ANSI/
NFPA 70) and with applicable local codes having
jurisdiction.
• The low voltage wires must be properly connected to
the units low voltage terminal block. Recommended
wire gauge and wire lengths for typical thermostat
connections are listed in Table 2.
• The thermostat should be mounted about 5 feet
above the floor on an inside wall. DO NOT install the
thermostat on an outside wall or any other location
where its operation may be adversely affected by radiant
heat from fireplaces, sunlight, or lighting fixtures, and
convective heat from warm air registers or electrical
appliances. Refer to the thermostat manufacturer’s
instruction sheet for detailed mounting and installation
information.
table 2. thermostat Wire gauge
thermostat
Wire gauge
recommended t-Stat Wire
unit to t-Stat (length in Ft)
2-Wire
(Heating)
5-Wire
(Heating/Cooling)
24 55 25
22 90 45
20 140 70
18 225 110
Reverse Rotation Verification
After making all of the power connections to the unit, the
rotation of the compressor must be checked. If the rotation
is in the wrong direction, the compressor will make an
abnormally loud noise. To check the rotation perform the
following steps:
1. Make sure the outside power disconnect is in the OFF
position.
2. Set the indoor thermostat to a set point that will call for
cooling.
3. Retun to the outside power disconnect and switch it
to the ON position. If the compressor is making an