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Installation
Main Unit Power Wiring
WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow codes could result in death or serious injury.
A field supplied disconnect switch must be installed at or
near the unit in accordance with the National Electric Code
(NEC latest edition).
Location of the applicable electric service entrance for
HIGH (line voltage) may be found in the Dimensions
section of this manual.
The high-voltage connection is made at the 1K1 contactor
or 1TB power block inside the unit control box. See
Figure 56, p.
58. Refer to the customer connection diagram
that is shipped with the unit for specific termination points.
Provide proper grounding for the unit in accordance with
the local and national codes.
Figure 56. Power wiring example
Control Power Transformer
The 24 V control power transformers are to be used only
with the accessories called out in this manual. A 50 VA
transformer is externally fused. Transformers rated
greater than 50 VA are equipped with circuit breakers. If a
circuit breaker trips, turn OFF all power to the unit before
attempting to reset it.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
58
The transformer is located in the control panel. See
Figure 56, p. 58
for power wiring example.
Thermostat Location
Figure 57.
Thermostat/sensor location
NO
YES
NO O
Location of the thermostat or zone sensor is an important
element of effective room control.
Areas where the thermostat or zone sensor should not be
located include:
•
Behind doors or corners
•
Near hot or cold air ducts
•
Near radiant heat (heat emitted from appliances or the
sun)
•
Near concealed pipes or chimneys
•
On outside walls or other non conditioned surfaces
In air-flows from adjacent zones or other units.
Controls Using 24 VAC
Before installing any wire, refer to the electrical access
locations in the
"Unit Dimensions and Weights, " p. 11
this manual.
Ensure that the AC control wiring between the controls
and the unit termination point does not exceed 3 Ohms/
conductor for the length of the run.
NOTICE:
Component Failure!
Resistance in excess of 3 Ohms per conductor could
result in component failure due to insufficient AC
voltage supply.
Check all loads and conductors for grounds, shorts, and
mis-wiring.
Use copper conductors unless otherwise specified.
Do not run the AC low-voltage wiring in the same conduit
with the high voltage power wiring.
Table 37.
24V AC conductors
Distance from unit to
control
000-460 ft
461-732 ft
733-1000 ft
NO
of
Recommended wire size
18 gauge
16 gauge
14 gauge
WSHP-SVX01L-EN
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