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2
2
R
Two-Stage Communicating Thermostat
Low Voltage Wire Connection (communicating mode)
S
S
U
YSTEM
TART
P
POSSIBLE REFRIGERANT LEAK!
T
O
AVOID
A
POSSIBLE
REFRIGERANT
UNTIL
THE
TOP
OF
THE
STEM
IS
NOTE: Power must be supplied to the 18 SEER outdoor units
containing ECM motors before the power is applied to the in-
door 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 HSVTC evapora-
tor coil and 15 feet of lineset is supplied with the condensing
unit. If using evaporator coils 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 first! If the liquid service valve is
opened first, oil from the compressor may be drawn into the
indoor coil TXV, restricting refrigerant flow and affecting opera-
tion 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 open-
ing valves without a retainer remove service valve cap and in-
sert 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 valves 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 finger-tight
and then tighten additional 1/6 of a turn (1 wrench flat) to prop-
erly seat the sealing surfaces.
Communicating
Thermostat
COMMUNICATING
FURNACE OR
AIR HANDLER
COMMUNICATING
OD UNIT
CAUTION
,
LEAK
OPEN
THE
SERVICE
VALVES
1/8"
.
FROM
THE
RETAINER
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 fixed orifices and 20 minutes for expansion
valves.
C
V
HARGE
ERIFICATION
REFRIGERANT UNDER PRESSURE!
• D
O
NOT
OVERCHARGE
• D
O
NOT
OPERATE
UNIT
F
AILURE
TO
FOLLOW
,
DAMAGE
PERSONAL
U
SE
REFRIGERANT
CERTIFIED
MAY
CAUSE
COMPRESSOR
. M
WARRANTY
OST
PORTABLE
REFRIGERANT
TO
MEET
NOTICE
V
EPA
IOLATION
OF
REGULATIONS
.
PENALTIES
O
PERATING
THE
COMPRESSOR
CAUSE
SERIOUS
COMPRESSOR
F
C
INAL
HARGE
The outdoor temperature must be 60°F or higher. Set the room
thermostat to COOL, fan switch to AUTO, and set the tem-
perature control well below room temperature.
After system has stabilized per startup instructions, check
subcooling and superheat as detailed in the following section.
T
O
PREVENT
PERSONAL
MANIFOLD
GAUGE
HOSES
. D
BURNS
O
NOT
VENT
ALL
REFRIGERANT
DURING
.
DISPOSAL
E
V
XPANSION
ALVE
NOTE: Units matched with indoor coils equipped with
non-adjustable TXV should be charged by subcooling
only.
6
WARNING
.
SYSTEM
WITH
REFRIGERANT
IN
A
VACUUM
OR
AT
NEGATIVE
PROPER
PROCEDURES
MAY
CAUSE
.
INJURY
OR
DEATH
CAUTION
AHRI
. U
TO
STANDARDS
,
DAMAGE
AND
IS
NOT
COVERED
MACHINES
CANNOT
CLEAN
AHRI
.
STANDARDS
MAY
RESULT
IN
FINES
CAUTION
WITH
THE
SUCTION
VALVE
.
DAMAGE
A
DJUSTMENT
CAUTION
,
INJURY
CAREFULLY
CONNECT
. E
SCAPING
LIQUID
REFRIGERANT
REFRIGERANT
INTO
THE
ATMOSPHERE
SYSTEM
REPAIR
AND
BEFORE
S
YSTEM
.
PRESSURE
PROPERTY
SED
REFRIGERANT
UNDER
THE
USED
OR
OTHER
CLOSED
MAY
AND
DISCONNECT
CAN
CAUSE
. R
ECOVER
FINAL
UNIT
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