6
Refer to outdoor unit wiring instructions for any additional wiring
procedure recommendations.
Transformer Information
Transformer is factory−wired for 230v operation. For 208v
applications, disconnect the black wire from the 230v terminal on
transformer and connect it to the 208v terminal. (See Fig. 13.)
230
C
208
BRN
RED
YEL
BLK
SECONDARY
PRIMARY
A05182
Fig. 13 − Transformer Connections
Heater Staging
If electric heat staging is required, a multi−stage heating room
thermostat is required. Consult your equipment supplier for a
suitable thermostat.
C. Manufactured Housing
In manufactured housing applications, the Code of Federal
Regulations, Title 24, Chapter XX, Part 3280.714 requires that
supplemental electric heat be locked out at outdoor temperatures
above 40F (4C), except for a heat pump defrost cycle. Refer to
Fig. 12 for typical low voltage wiring with outdoor thermostat.
D. Ground Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
According to NEC, ANSI/NFPA 70, and local codes, the
cabinet must have an uninterrupted or unbroken ground to
minimize personal injury if an electrical fault should occur.
The ground may consist of electrical wire or metal conduit
when installed in accordance with existing electrical codes. If
conduit connection uses reducing washers, a separate ground
wire must be used.
!
WARNING
NOTE: Use UL−listed conduit and conduit connector for
connecting supply wire(s) to unit to obtain proper grounding.
Grounding may also be accomplished by using grounding lugs
provided in control box.
E. Minimum CFM and Motor Speed Selection
The fan speed selection is done at the motor connector. Units with
or without electric heaters require a minimum CFM. Refer to the
unit wiring label to ensure that the fan speed selected is not lower
than the minimum fan speed indicated.
Ta p 1 Low 90 sec off delay
Tap 2 Medium 90 sec off delay
Tap 3 High 90 sec off delay
Tap 4 Electric heat † 0 sec off delay
Tap 5 Max ‡ 0 sec off delay
† electric heat airflow is same CFM as Tap 3, except 0 sec off delay
‡ high static applications, see airflow tables for max airflow
To change motor speeds disconnect the BLUE fan lead from motor
connector terminal #2 (factory default position) and move to
desired speed-tap; 1, 2, 3, or 5.
Speed-taps 1, 2, and 3 have a 90 second blower off time delay
pre-programmed into the motor. Speed-tap 4 is used for electric
heat only (with 0 second blower time delay) and the WHITE wire
should remain on tap 4. Speed-tap 5 is used for high static
applications, but has a 0 second blower time delay
pre-programmed into the motor. See Airflow Performance tables
for actual CFM. Also, see Fig. 14 for motor speed selection
location.
NOTE: In low static applications, lower motor speed tap should
be used to reduce possibility of water being blown off coil.
1 2 3 4 5
Speed Taps may be located on motor,
or on plug close to motor.
CLGN
1 2 3 4 5
A11048
Fig. 14 − Motor Speed Selection
Step 5 — Refrigerant Tubing Connection and
Evacuation
Use accessory tubing package or field−supplied tubing of
refrigerant grade. Suction tube must be insulated. Do not use
damaged, dirty, or contaminated tubing because it may plug
refrigerant flow−control device. ALWAYS evacuate the coil and
field−supplied tubing to 500 microns before opening outdoor unit
service valves.
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