21
Installation, Operation & Maintenance - HKV Series
Electrical - Power Wiring
Figure 8: Typical HKV Series Line Voltage Field Wiring
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.
HKV Power Connection
- Line voltage connection is
made by connecting the incoming line voltage wires to
the power block as shown in Figure 8. Consult Table 4a
and 4b for correct fuse size.
208 Volt Operation
- All 208-230 Volt units are factory
wired for 208 Volt. The transformers may be switched to
230V operation as illustrated on the wiring diagram by
switching the Red (208V) and the Orange (230V) at the
contactor terminal L2.
All field installed wiring, including electrical ground, must
comply with the National Electrical Code as well as all
applicable local codes.
Refer to the unit wiring diagrams for fuse sizes and a
schematic of the field connections which must be made
by the installing (or electrical) contractor.
Consult the unit wiring diagram located on the inside of
the compressor access panel to ensure proper electrical
hookup.
All final electrical connections must be made with a
length of flexible conduit to minimize vibration and
sound transmission to the building.
Thermostat Installation
- The thermostat should be
located on an interior wall in a larger room away from
supply duct 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 backplate against
the wall so that it appears level and so the thermostat
wires protrude through the middle of the backplate. Mark
the position of the backplate mounting holes and drill
holes with a 3/16" 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 13 to
the low voltage terminal strip in the CXM/DXM2 Control
as shown in Figure 9 using 18 AWG thermostat wire of
minimum length.
�
WARNING!
�
WARNING!
To avoid possible injury or death due to
electrical shock, open the power supply disconnect switch
and secure it in an open position during installation.
�
CAUTION!
�
CAUTION!
Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
�
WARNING!
�
WARNING!
Disconnect electrical power source to prevent
injury or death from electrical shock.
Figure 9: Low Voltage Field Wiring (CXM show)
NOTE: For DXM2, Y2 wiring at DXM2-1