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� WARNING! �
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
General Line Voltage Wiring - Be sure the available
power is the same voltage and phase as that shown on
the unit serial plate. Line and low voltage wiring must
be done in accordance with local codes or the National
Electric Code, whichever is applicable.
JRE Power Connection - Line voltage connection is
made by connecting the incoming line voltage wires to
the power block. Line voltage conduit should be routed
through curb and unit pipe chase. Terminate conduit at
control/compressor deck.
208 Volt Operation - All 208-240 Volt units are factory
wired for 208 Volt. The transformers may be switched to
240V operation as illustrated on the wiring diagram by
switching the Red (240V) and the Orange (208V) wires
on the transformer primary side. Unused wire terminal will
be "hot" and must be insulated and secured to prevent an
electric short.
� CAUTION! �
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
Optional GFI Outlet requires dedicated 115V - 20 AMP
circuit provided by installer
Figure 2 illustrates a typical trap used with JRE Heat Pumps.
Multiple units within the same zone should be operated
from a common temperature control.
Thermostat Wiring - All wiring must comply with all
applicable electrical codes including NEC and local codes.
Complete all wiring before units are installed. Use multi
conductor, color-coded, low-voltage cable for all wiring.
Refer to unit wiring diagram for required thermostat
connections.
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
� CAUTION! �
CAUTION! Maintain zone integrity to assure accurate and
efficient operational control of units or groups of units.
Without adequate zone control, adjacent units may operate in
heating and cooling mode simultaneously.
Refer to Table 2 for wire sizes and lengths. Do not allow
the total resistance of all low-voltage wires used to exceed
1 ohm. Resistance in excess of 1 ohm may cause high
voltage drop which may result in control malfunction.
Refer to the thermostat installation and operation manual
to determine recommended heat anticipator settings.
When using a DDC building management system (BMS),
communication grade wire may be required. Verify
required communication and sensor wiring type with the
manufacturer of the BMS system components.
Table 2: Recommended Thermostat Wire Sizes
WIRE SIZE
22 - Gauge
20 - Gauge
18 - Gauge
16 - Gauge
14 - Gauge
* Length = physical length of wire from thermostat to unit.
JRE - Series
R e v . : A u g u s t 1 9 , 2 0 2 0
Electrical Wiring
MAX. WIRE LENGTH*
30 feet [9.14m]
50 feet [15.24m]
75 feet [22.86m]
125 feet [38.1m]
200 feet [60.96m]
15
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