8
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
• Units are shipped from the factory wired for 240 volt transformer
operation. For 208V operation, remove the lead from the
transformer terminal marked 240V and connect it to the
terminal marked 208V.
• Optional equipment requiring connection to the power or
control circuits must be wired in strict accordance of the NEC
(ANSI/NFPA 70), applicable local codes, and the instructions
provided with the equipment.
Overcurrent Protection
Overcurrent protection must be provided at the branch circuit
distribution panel and sized as shown on the unit rating label and
according to applicable local codes. Generally, the best fuse or
breaker for any heat pump is the smallest size that will permit
the equipment to run under normal usage and provide maximum
equipment protection. Properly sized fuses and breakers also
prevent nuisance trips during unit startup
NOTE: If a fuse blows or a breaker trips, always determine
the reason. Do not arbitrarily install a larger fuse or breaker
and do not, in any case, exceed the maximum size listed
on the data label of the unit.
Grounding
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical
Code. Use the grounding lug provided in the control box for
grounding the unit.
Thermostat / Low Voltage Connections
• The unit is designed to operate from a 24 VAC Class II control
circuit. The control circuit wiring must comply with the current
provisions of the NEC (ANSI/NFPA 70) and with applicable
local codes having jurisdiction. Thermostat connections should
be made in accordance with the instructions supplied with the
thermostat and the indoor equipment.
• A heat pump thermostat is equipped with a system HEAT-
COOL EM HEATswitch, which provides a positive means of
preventing simultaneous operation of the heating and cooling
units. The thermostat is also equipped with an ON-AUTO fan
switch which allows the home owner to operate the indoor
blower when air circulation is desired.
• Connect the low voltage wires to the respective terminals
and
the thermostat instruction sheet for more detailed wiring
information.
• The thermostat should be mounted about 5 feet above the
floor on an inside wall. DO NOT install the thermostat on an
outside wall or any other location where its operation may be
adversely affected by radiant heat from fireplaces, sunlight, or
lighting fixtures, and convective heat from warm air registers or
electrical appliances. Refer to the thermostat manufacturer’s
instruction sheet for detailed mounting information.
Defrost Control Board Test Pins
• Placing a jumper between the test pins for less than 1 second
will bypass the Anti-Short Cycle Timer.
• Placing a jumper between the test pins for more than 1 second
will force the unit into a defrost cycle. As soon as the jumper
is removed, the defrost cycle will end as determined by the
typical criteria.
• To determine operating status or fault conditions, refer to
for diagnostic description.
Clearing Defrost Board Fault Codes
• Fault codes can be removed from memory through the use of
the test pins. This is accomplished by shorting the two test
pins momentarily (more than 1 second) while there is no Y1
IN input present.
• Without resetting using the test pins, the fault codes will stay
in the board’s memory continuously (even through loss of
power) for 7 days.
Electric Heat Package (optional)
This heat pump is shipped without an auxiliary electric heat kit
installed. If electric heat is desired, an accessory heater kit must
be field installed. Refer to
for blower speeds.
• Select the correct size heat package for the installation. See
specifications sheet for available kits and application. Install
the heater kit according to the to the installation instructions
provided with the kit.
• Installation is most easily accomplished before making duct
or electrical connections.
Outdoor Thermostat Options
HUD Outdoor Thermostat Option
This thermostat prevents the operation of supplemental electrical
resistance heat at outdoor temperatures above 40° F, except for
defrost operation. For additional info refer to Title 24: Housing and
Urban Development-Subpart H, Section 3280.714, Paragraph
1, Item ii.
1. Remove the white wire between terminal W2 (on the terminal
strip) and W2 IN terminal (on the defrost board) and discard.
for additional wiring connections.
2. Move the white jumper wire from W2 terminal (between E
and W2 on the terminal strip) and connect to W2 IN terminal
(on the defrost board).
2nd Stage Thermostat Option
Models without an outdoor thermostat have a white wire from
W2 on the terminal strip to W2 on the defrost board for the use
of supplemental electrical resistance heat for a W2 or E call. For
2nd stage outdoor thermostat wiring connections, see
.
A jumper wire is supplied from W2 to E on the terminal strip
on all models.
Blower Speed
For optimum system performance and comfort, it may be
necessary to change the factory speed setting. See
for factory settings.
WARNING:
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
