JRC-Series
R e v. : D e c e m b e r 8 , 2 0 2 1
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
23
Electrical, Cont’d.
Wire Size
Maximum Wire Length*
18-Gauge
75 feet [22m]
16-Gauge
125 feet [38m]
14-Gauge
200 feet [60 m]
Thermostat Installation - The thermostat should be located
on an interior wall in a larger room, away from supply air
drafts. DO NOT locate the thermostat in areas subject to
sunlight, drafts or on external walls. The wire access hole
behind the thermostat may in certain cases need to be
sealed to prevent erroneous temperature measurement.
Position the thermostat back plate against the wall so
that it appears level and so the thermostat wires protrude
through the middle of the back plate. Mark the position of
the back plate mounting holes and drill holes with a 3/16”
(5mm) bit. Install supplied anchors and secure plate to the
wall. Thermostat wire must be 18 AWG wire. Wire the
appropriate thermostat as shown in Figure 7 to the low
voltage terminal strip on the CXM or DXM control board.
Practically any heat pump thermostat will work with JRC
WSHP units, provided it has the correct number of heating
and cooling stages.
Zone integrity must be maintained to efficiently control units
or groups of units. Unless zones of control are considered
and accounted for, adjacent units may operate in heating
and cooling modes simultaneously. To prevent this problem,
multiple units configured with the DXM controller can be
controlled by one thermostat as shown in figure 7A.
*Length = Physical distance from thermostat to unit.
Table 6: Recommended Thermostat Wire Sizes
Figure 7: Typical Remote Thermostat Wiring
Thermostat
Connection to CXM Control
Compressor
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
Y
O
G
R
C
L
Y
O
G
R
C
AL1
CXM
Figure 7a: Wiring for multiple units to be controlled
from 1 thermostat
CS
DXM
Unit
1
Connect thermostat to Unit 1 then
jumper Com 1 (S to S and C to C)
up to 6 units with twisted pair.
DXM
Unit
2-6
Thermostat
CS
