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3.12 THERMOSTAT
See instructions for the condensing unit or heat pump for recommended room thermostats.
• On units with one electric heat sequencer (TD1) (see wiring diagram for electric
heater), heat anticipator setting should be .16.
• On units with two electric heat sequencers (TD1 & TD2) (see wiring diagram for elec-
tric heater), heat anticipator setting should be .32 if both are connected to same stage
on thermostat. Setting should be .16 if (TD1 & TD2) are connected to separate stages.
NOTE: Some thermostats contain a fixed, non-adjustable heat anticipator. Adjustment
is not permitted.
• The thermostat should be mounted 4 to 5 feet above the floor on an inside wall of the
living room or a hallway that has good air circulation from the other rooms being con-
trolled by the thermostat. It is essential that there be free air circulation at the location
of the same average temperature as other rooms being controlled. Movement of air
should not be obstructed by furniture, doors, draperies, etc. The thermostat should
not be mounted where it will be affected by drafts, hot or cold water pipes or air ducts
in walls, radiant heat from fireplace, lamps, the sun, T.V. or an outside wall. See
instruction sheet packaged with thermostat for mounting and installation instructions.
3.13 ELECTRICAL WIRING
Field wiring must comply with the National Electric Code (C.E.C. in Canada) and any
applicable local ordinance.
3.13.1 CONFIGURING UNIT FOR 208 VOLT POWER
The control transformer in 208/240V air-handlers must be configured in the field to oper-
ate on a 208 volt electrical supply to assure adequate control voltage (24+ volts) with the
reduced supply voltage. The units are shipped from the factory for 220-240 volt applica-
tions. For 208 volt applications, disconnect electrical power to the unit and remove the
blower access panel and then the control box cover located on the blower housing.
Then remove the insulated cap from the 208 volt transformer terminal and move the
BLACK wires that are connected to the 240 volt transformer terminal to the 208 volt
transformer terminal. Plug the insulated cap onto the transformer 240V terminal.
The indoor blower motor in 208/240V versions of the (-)H1P air-handlers must also be
configured for 208 volt applications to assure full air-flow delivery at the reduced voltage.
This step is not required on (-)H1T air-handlers since they have constant torque ECM
motors. To configure the PSC motor in (-)H1P air-handlers for 208 volt applications,
unplug the PURPLE motor lead connected to the insulated terminal on the end of the
ORANGE wire coming from the transformer. Pull the cap out of the insulated terminal on
end of the YELLOW motor lead and plug the cap into the terminal on the end of the
PURPLE motor lead to eliminate the possibility of an electrical short. Plug the YELLOW
motor lead into the terminal on the end of the ORANGE wire from the transformer.
Secure the indoor blower motor wiring with zip ties to assure they can’t come in contact
with the blower wheel. Replace the control box cover and blower access panel.
3.13.2 GROUNDING
• This product must be sufficiently grounded in accordance with National Electrical
Code (C.E.C. in Canada) and any applicable local ordinance.
• Grounding may be accomplished by grounding metal conduit when installed in accor-
dance with electrical codes to the unit cabinet.
• Grounding may also be accomplished by attaching ground wire(s) to ground lug(s)
provided in the unit wiring compartment.
• Ground lug(s) are located close to wire entrance on left side of unit (upflow). Lug(s)
may be moved to marked locations near wire entrance on right side of unit (upflow), if
alternate location is more convenient.
• Use of multiple supply circuits require grounding of each circuit to lug(s) provided in unit.
3.13.3 POWER WIRING
It is important that proper electrical power is available for connection to the unit model
being installed. See the unit nameplate, wiring diagram and electrical data in the installa-
tion instructions.
• If required, install a branch circuit disconnect of adequate size, located within sight of,
and readily accessible to the unit.
• IMPORTANT: Units with electric heater kits installed may be equipped with one, two,
or three 30/60 amp circuit breakers. These breaker(s) protect the internal wiring in the
event of a short circuit and serve as a disconnect. Circuit breakers installed within the
unit do not provide over-current protection of the supply wiring and therefore may be
sized larger than the branch circuit protection.
!
WARNING
The unit must be permanently grounded. Failure to do so can result in electri-
cal shock causing personal injury or death.
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