8
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. 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 Connections
• 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
on the thermostat base. See Figure 13 (page 21) 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
Table 2 (page 10) 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 Table 1 (page 9) 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.
See Figure 13 (page 21) 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 Figure 13.
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 Table 1
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.
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
CAUTION:
To avoid personal injury or property damage,
make certain that the motor leads cannot come
into contact with any metal components of the
unit.
1. Disconnect all electrical power to the unit and remove the
service panel.
2. Verify the required speed from the airflow data found in Table
2. Place appropriate wire on the appropriate motor speed tap
for the required airflow.
3. Check all factory wiring per the unit wiring diagram and inspect
the factory wiring connections make sure no wires loosened
during shipping or installation.
To Next Page
Loading...
