Installation Manual
6
HIGH
VOLTAGE
PORT
LOW
VOLTAGE
PORT
Voltage Ports
NOTE: For two-stage units, refer to the Installation Instructions
supplied with the variable speed indoor units for eld wiring
connections.
NOTE: If the heat pump unit is wired in the communicating
mode together with a compatible communicating indoor unit,
then the communicating equipment is able to search and
identify the condensing unit when power is applied to the
system. Refer to the Installation Manual of the communicating
indoor equipment for more information.
For non-communicating (legacy 24VAC) installations, use
the dipswitch to select defrost time interval (30, 60, 90, 120
minutes; see chart below).
Factory default setting is 30 minutes. The maximum defrost
cycle time is 10 minutes.
60
30
0
30 Minutes
60
60
30
0
60 Minutes
60
120 Minutes
60
30
0
90 Minutes
60
60
30
0
60
Dipswitch Settings for Selection of Defrost Time
SyStem Start up
POSSIBLE REFRIGERANT LEAK!
T
O
AVOID
A
POSSIBLE
REFRIGERANT
LEAK
,
OPEN
THE
SERVICE
VALVES
UNTIL
THE
TOP
OF
THE
STEM
IS
1/8”
FROM
THE
RETAINER
.
CAUTION
NOTE: Power must be supplied to the 18 SEER outdoor units
containing ECM motors before the power is applied to the
indoor unit. Sending a low voltage signal without high voltage
power present at the outdoor unit can cause malfunction of
the control module on the ECM motor.
Adequate refrigerant charge for the matching evaporator
coil or air handler and 15 feet of lineset is supplied with the
condensing unit. If using evaporator coils or air handlers
other than HSVTC coil it maybe necessary to add or remove
refrigerant to attain proper charge. If line set exceeds 15 feet
in length, refrigerant should be added at .6 ounces per foot
of liquid line.
NOTE: Charge should always be checked using superheat
when using a piston and subcooling when using TXV equipped
indoor coil to verify proper charge.
Open the suction service valve rst! If the liquid service valve
is opened rst, oil from the compressor may be drawn into
the indoor coil TXV, restricting refrigerant ow and affecting
operation of the system.
When opening valves with retainers, open each valve only
until the top of the stem is 1/8” from the retainer. To avoid loss
of refrigerant, DO NOT apply pressure to the retainer. When
opening valves without a retainer remove service valve cap
and insert a hex wrench into the valve stem and back out the
stem by turning the hex wrench counterclockwise. Open the
valve until it contacts the rolled lip of the valve body.
NOTE: These are not back-seating valves. It is not necessary
to force the stem tightly against the rolled lip.
After the refrigerant charge has bled into the system, open the
liquid service valve. The service valve cap is the secondary
seal for the valve and must be properly tightened to prevent
leaks. Make sure cap is clean and apply refrigerant oil to
threads and sealing surface on inside of cap. Tighten cap
nger-tight and then tighten additional 1/6 of a turn (1 wrench
at) to properly seat the sealing surfaces.
Do not introduce liquid refrigerant from the cylinder into
the crankcase of the compressor as this may damage
the compressor.
1. Break vacuum by fully opening liquid and suction base
valves.
2. Set thermostat to call for cooling. Check indoor and
outdoor fan operation and allow system to stabilize
for 10 minutes for xed orices and 20 minutes for
expansion valves.
charge verIfIcatIon
REFRIGERANT UNDER PRESSURE!
• D
O
NOT
OVERCHARGE
SYSTEM
WITH
REFRIGERANT
.
• D
O
NOT
OPERATE
UNIT
IN
A
VACUUM
OR
AT
NEGATIVE
PRESSURE
.
F
AILURE
TO
FOLLOW
PROPER
PROCEDURES
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
U
SE
REFRIGERANT
CERTIFIED
TO
AHRI
STANDARDS
. U
SED
REFRIGERANT
MAY
CAUSE
COMPRESSOR
DAMAGE
,
AND
DAMAGE
CAUSED
BY
USED
REGRIGERANT
IS
NOT
COVERED
UNDER
THE
WARRANTY
. M
OST
PORTABLE
MACHINES
CANNOT
CLEAN
USED
REFRIGERANT
TO
MEET
AHRI
STANDARDS
.
CAUTION