5
Line Set Length
(Tons)
Suct
Liq
2
3/4
3/8
3
7/8
3/8
4
1 1/8
3/8
5
1 1/8
3/8
RECOMMENDED
INTERCONNECTING TUBING (Ft)
0 - 250' Equivalent
Heat Pump
Unit
Line Type
& Line Diameter (In. OD)
R
EFRIGERANT
L
INE
C
ONNECTIONS
IMPORTANT
To avoid overheating the service valve, TXV or filter drier
while brazing, wrap the component with a wet rag, or use a
thermal heat trap compound. Be sure to follow the
manufacturer’s instruction when using the heat trap
compound. Note: Remove Schrader valves from service
valves before brazing tubes to the valves. Use a brazing alloy
of 2% minimum silver content. Do not use flux.
Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much heat to any
tube can melt the tube. Service personnel must use the
appropriate heat level for the size of the tube being brazed.
NOTE:
The use of a heat shield when brazing is recommended
to avoid burning the serial plate or the finish on the unit.
1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks or
dents. Any other condition increases the chance of a
refrigerant leak.
2. “Sweep” the refrigerant line with nitrogen or inert gas
during brazing to prevent the formation of copper-oxide
inside the refrigerant lines. The FVC oils used in R-410A
applications will clean any copper-oxide present from the
inside of the refrigerant lines and spread it throughout
the system. This may cause a blockage or failure of the
metering device.
3. After brazing, quench the joints with water or a wet cloth
to prevent overheating of the service valve.
4. A bi-flow filter drier is shipped with the unit as a separate
component and must be brazed on by the installer on-
site. Ensure the bi-flow filter drier paint finish is intact after
brazing. If the paint of the steel filter drier has been
burned or chipped, repaint or treat with a rust
preventative.
The recommended location of the filter drier is before the
expansion device at the indoor unit.
NOTE:
Be careful not to kink or dent refrigerant lines. Kinked or
dented lines will cause poor performance or compressor damage.
Do NOT make final refrigerant line connection until plugs are
removed from refrigerant tubing.
L
EAK
T
ESTING
(N
ITROGEN
OR
N
ITROGEN
-T
RACED
)
T
O
AVOID
THE
RISK
OF
FIRE
OR
EXPLOSION
,
NEVER
USE
OXYGEN
,
HIGH
PRESSURE
AIR
OR
FLAMMABLE
GASES
FOR
LEAK
TESTING
OF
A
REFRIGERATION
SYSTEM
.
WARNING
T
O
AVOID
POSSIBLE
EXPLOSION
,
THE
LINE
FROM
THE
NITROGEN
CYLINDER
MUST
INCLUDE
A
PRESSURE
REGULATOR
AND
A
PRESSURE
RELIEF
VALVE
. T
HE
PRESSURE
RELIEF
VALVE
MUST
BE
SET
TO
OPEN
AT
NO
MORE
THAN
150
PSIG
.
WARNING
To locate leaks, pressure test the system using dry nitrogen or
leak detector fluid per the manufacturer’s recommendation. If
you wish to use a leak detector, charge the system to 10 psi us-
ing the appropriate refrigerant then use nitrogen to finish charg-
ing the system to working pressure then apply the detector to
suspect areas. If leaks are found, repair them. After repair, re-
peat the pressure test. If no leaks exist, proceed to
System Start-
up Procedure.
S
YSTEM
S
TART
-
UP
P
ROCEDURE
GENERAL NOTES:
Adequate refrigerant charge for the matching indoor coil and 15
feet of line set is supplied with the heat pump unit. If liquid line
set exceeds 15 feet in length, refrigerant should be added at 0.6
ounces per foot of liquid line.
V
IOLATION
OF
EPA
REGULATIONS
MAY
RESULT
IN
FINES
OR
OTHER
PENALTIES
.
NOTICE
A
LL
UNITS
SHOULD
HAVE
A
HIGH
VOLTAGE
POWER
SUPPLY
CONNECTED
2
HOURS
PRIOR
TO
STARTUP
.
NOTICE
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
O
PERATING
THE
COMPRESSOR
WITH
THE
GAS
VALVE
CLOSED
WILL
CAUSE
SERIOUS
COMPRESSOR
DAMAGE
-
SUCH
DAMAGE
IS
NOT
COVERED
BY
OUR
WARRANTIES
.
CAUTION
