24
3.12.2. Making the Electrical Connections
Refer to
Figure 24
through
Figure 28
.
1. Verify that circuit breaker is properly sized by
referring to heater rating plate. A dedicated circuit
breaker should be provided.
2. NOTE: Current draw noted on rating plate does not
include pump current.
3. Turn off all power to the heater. Verify that power
has been turned off by testing with a multi-meter
prior to working with any electrical connections or
components.
4. Observe proper wire colors while making electrical
connections. Many electronic controls are polarity
sensitive. Components damaged by improper
electrical installation are not covered by warranty.
5. Provide overload protection and a disconnect means
for equipment serviceability as required by local and
state code.
Figure 25. Wiring Connections
CIRCUIT
BREAKER
WHITE
GROUND
BLACK
GREEN
A B C
A
A
WARNING:
Using a multi-meter, check the following
voltages at the circuit breaker panel prior to connecting
any equipment. Make sure proper polarity is followed and
house ground is proven. (See Figs. 22-24.)
Figure 26. Multi-meter
Check the power source:
AC = 108 VAC Minimum, 132 VAC MAX
AB = 108 VAC Minimum, 132 VAC MAX
BC = <1 VAC Maximum
6. Install heater controls, thermostats, or building
management systems in accordance with the
applicable manufacturers’ instructions.
7. Conduit should not be used as the earth ground.
NOTE:
A grounding electrode conductor shall be used
to connect the equipment grounding conductors,
the equipment enclosures, and the grounded service
conductor to the grounding electrode.
3.13. Field Wiring Connections
A
A
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
A
A
DANGER: SHOCK HAZARD
Make sure electrical power to the heater is disconnected
to avoid potential serious injury or damage to components.
3.13.1. Wiring the Enable/Disable
Connect the Enable/Disable (terminals 11 and 12) wiring
to the field wiring terminals as shown in
Figure 29
.
Alternately, any dry contact closure (including a remote
thermostat) across these terminals will enable the XTherm
heater to run.
A
A
CAUTION:
Ensure neither of the terminals are shorted
to ground.
3.13.2. Wiring the Outdoor Sensor
1. If using an Outdoor Sensor, connect the sensor
wires to the terminals (8 and 9) marked OUTDOOR
SENSOR. See
Figure 29
.
A
A
CAUTION:
Ensure sensor wiring is not shorted to
ground.
2. Use a minimum 18 AWG stranded wire for runs of up
to 150 ft (46 m).
3. Mount the outdoor sensor on an exterior surface of
the building, preferably on the north side in an area
that will not be affected by direct sunlight and that
will be exposed to varying weather conditions.
