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Electrical Connections − Power Supply
Do not apply power or close disconnect switch until
installation is complete. Refer to start−up directions. Refer
closely to unit wiring diagram.
Refer to unit nameplate for minimum circuit ampacity and
maximum overcurrent protection.
1− All units are factory wired. For 208V supply,
disconnect the orange wire (230V) at control power
transformer. Reconnect the red wire (208V). Tape the
exposed end of the 230V orange wire.
Units Without Optional Disconnect
1− The unit is provided with power entry knockouts
through the base and the blower section mullion (see
page 1).
2−
Horizontal Power Entry
− Remove necessary
electrical knockouts on blower section mullion.
Bottom Power Entry
−
Route wires through knockout on power entry cover.
NOTE − It may be necessary to punch larger holes for
power wiring (refer to current NEC/CEC requirements).
3− Install adequate disconnect switch external to unit in
accordance
with
local
or
national
codes
as
applicable.
Units With Factory−Installed GFI
1− Remove necessary electrical knockouts in unit.
2− Make power wiring connections in bottom power
entry box.
3− Connect separate 120v wiring to GFCI outlet pigtails
in handy box on front left corner mullion.
Electrical Connections − Control Wiring
A−Thermostat Location
Room
thermostat
mounts
vertically
on
any
non−conductive flat surface.
Locate thermostat approximately 5 feet (1.5m) 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 units
−concealed pipes and chimneys
B−Control Wiring
1− Route thermostat cable or wires from subbase
through conduit provided in unit. Refer to wiring
diagram on unit. For thermostat wire runs up to 60 feet
(18m), use 18 gauge wire. For 60 to 90 feet (18 to
27m) runs, use 16 gauge wire.
2− Install
thermostat
and
humidity
sensor
in
accordance
with
instructions
provided
with
thermostat or sensor. See figure 11 to wire units set
in local thermostat mode. See figure 12 for units
wired in zone sensor mode.
2− Install thermostat assembly in accordance with
instructions provided with thermostat.
IMPORTANT−Terminal connections at the wall plate or
subbase must be made securely. Loose control wire
connections may allow unit to operate but not with proper
response to room demand.
C−Commercial Controls Platform
Units without an optional factory−installed control system
may use a variety of different temperature control systems.
The unit has a pre−wired jack−plug platform allowing a
variety of control systems to Hplug−in" to unit jack−plugs.
Control systems which have the mating commercial
controls platform jack−plug contain a control system wiring
diagram HC" section. This diagram section is used with unit
and accessory diagram sections for total system
operation. Affix diagrams to unit in alpha−numeric order as
shown in figure 10. Refer closely to installation instructions
provided with each temperature control system for proper
unit operation.
FIGURE 10
COMPLETE SYSTEM DIAGRAM
HA"
Heating
Section
HB"
Unit
Section
HC"
Control
Section
HD"
Economizer
Section
