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506393−01 11/2010
Electrical Connections
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
POWER SUPPLY
Do not apply power or close disconnect switch until
installation is complete. Refer to start−up directions.
Refer to unit nameplate for minimum circuit ampacity
and maximum fuse size.
1− Units are factory−wired for 240/460/575 volt supply.
For 208V supply,
remove the insulated terminal
cover from the 208V terminal on the control
transformer. Move the wire from the transformer
240V terminal to the 208V terminal. Place the
insulated terminal cover on the unused 240V
terminal.
2− Route power through the bottom power entry area
and connect to L1, L2, and L3 on TB2 in incoming
power enclosure. See unit wiring diagram.
CONTROL WIRING
A−Thermostat Location
Room thermostat mounts vertically on a standard 2" X 4"
handy box or on any non−conductive flat surface.
Locate thermostat approximately 5 feet (1524mm)
above the floor in an area with good air circulation at
average temperature. Avoid locating the room
thermostat where it might be affected by:
−drafts or dead spots behind doors and in corners
−hot or cold air from ducts
−radiant heat from sun or appliances
−concealed pipes and chimneys
B−Control Wiring
1− Route thermostat cable or wires from subbase to
unit TB1 in control box (refer to unit dimensions to
locate bottom and side power entry).
IMPORTANT − Unless field thermostat wires are rated for
maximum unit voltage, they must be routed away from
line voltage wiring. Use wire ties located in control area
to secure thermostat cable.
Use18 AWG wire for all applications using remotely
installed electro−mechanical and electronic
thermostats.
2− Install thermostat assembly in accordance with
instructions provided with thermostat.
3− Connect thermostat wiring to TB1 terminal as shown
in figure 4 for electro−mechanical and electronic
thermostats. If using other temperature control
devices or energy management systems see
instructions and wiring diagram provided by
manufacturer.
IMPORTANT−Terminal connections at the subbase and
TB1 must be made securely. Loose control wire
connections may allow unit to operate but not with proper
response to room demand.
24 VOLT FIELD WIRING WITH ELECTRONIC AND
ELECTRO−MECHANICAL THERMOSTATS
NOT ALL TERMINALS
ARE FOUND ON ALL
THERMOSTATS
Note − On electro−mechanical thermo-
stats set anticipator at 0.1 amps.
Remove jumper between TB1−R
and TB1−OC when a night set-
back thermostat is installed.
A2 THERMOSTAT
TB1
FIGURE 4
