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Split Inverter Air-to-Water Heat Pump
This section provides details on installation and charging of the refrigeration line set with the unit.
Field refrigerant piping consists of liquid and suction lines from the outdoor unit to the indoor unit coil.
If refrigerant lines are routed through a wall, seal and isolate the opening so vibration is not
transmitted to the building. Pay close attention to line set isolation during installation of any HVAC
system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant
lines will not create unnecessary vibration and subsequent sounds.
Mineral oils are not compatible with HFC−410A. If oil must be added, it must be a
Polyol ester oil.
Each split system (indoor and outdoor) units come pre-charged with refrigerant up to
16ft. For installations more than 16ft (max 35) please refer to table for the appropriate oz needed.
The split system should ONLY be charged based off of the charging table and the "weigh-in method.
Refrigerant Charging
R410a Charging Table
Feet
Add (oz)
<16
0
17
0.3
18
0.9
19
1.4
20
1.9
21
2.5
22
3
23
3.5
24
4.1
25
4.6
26
5.2
27
5.7
28
6.2
29
6.8
30
7.3
31
7.9
32
8.4
33
8.9
34
9.5
35
10
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
STRAP LIQUID LINE TO
VAPOR LINE
WALL
STUD
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
AUTOMOTIVE
MUFFLER-TYPE HANGER
REFRIGERANT LINE SET � TRANSITION
FROM VERTICAL TO HORIZONTAL
Line Set Isolation
� The following illustrations are
examples of proper refrigerant line set isolation:
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIE
WIRE TIE (AROUND
VAPOR LINE ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.
8 FEET (2.43 METERS)
STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
FLOOR JOIST OR
ROOF RAFTER
REFRIGERANT LINE SET � INSTALLING
HORIZONTAL RUNS
NOTE
� Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
OUTSIDE
WALL
VAPOR LINE WRAPPED
WITH ARMAFLEX
LIQUID
LINE
OUTSIDE WALL
LIQUID LINE
VAPOR LINE
WOOD BLOCK
BETWEEN STUDS
STRAP
WOOD BLOCK
STRAP
SLEEVE
WIRE TIE
WIRE TIE
WIRE TIE
INSIDE WALL
REFRIGERANT LINE SET � INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
INSTALLATION
LINE SET
NOTE � Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.
NON−CORROSIVE
METAL SLEEVE
IMPORTANT �
Refrigerant lines must not contact structure.
NON−CORROSIVE
METAL SLEEVE
8 FEET (2.43 METERS)
IMPORTANT �
Refrigerant lines must not contact wall
Polyol ester (POE)
oils used with HFC−410A re-
frigerant absorb moisture very
quickly. It is very important that
the refrigerant system be kept
closed as much as possible. DO
NOT remove line set caps or
service valve stub caps until you
are ready to make connections.
When using a
high pressure gas such as dry
nitrogen to pressurize a refrig-
eration or air conditioning sys-
tem, use a regulator that can
control the pressure down to 1
or 2 psig (6.9 to 13.8 kPa).
Fire, Explosion
and Personal Safety Hazard.
Failure to follow this warning
could result in damage, per-
sonal injury or death. Never
use oxygen to pressurize or
purge refrigeration lines. Oxy-
gen, when exposed to a spark
or open flame, can cause fire
and/or an explosion, that
could result in property dam-
age, personal injury or death.
Charging Table