Johnson Controls RHP150 Series - Piping Connections; Precautions During Line Installation

R-410A filter-drier Source
1 Part Number
Applicable models
S1-404101 All heat pumps
Piping connections
The outdoor unit must be connected to the indoor coil
using field-supplied refrigerant grade (ACR) copper tubing
that is internally clean and dry. Only install the unit with
the tubing sizes for approved system combinations as
specified in the Tabular data sheet. The charge given
is applicable for total tubing lengths up to 15 ft (4.6
m). Refer to the Piping Application Guide (P/N 247077)
for installing tubing of longer lengths and elevation
differences.
NOTICE
Using a larger than specified line size could result
in oil return problems. Using too small a line results
in loss of capacity and other problems caused by
insufficient refrigerant flow. Slope horizontal vapor
lines at least 1 in. (2.5 cm) every 20 ft (6.1 m) toward
the outdoor unit to facilitate sufficient oil return. If
more than the 80 ft line length is necessary, facilitate
sufficient refrigerant velocity with adjusted line
diameter in accordance with the Piping Application
Guide (P/N 247077).
CAUTION
This system uses R-410A refrigerant which operates
at higher pressures than R-22. No other refrigerant
may be used in this system. Gauge sets, hoses,
refrigerant containers, and the recovery system must
be designed to handle R-410A. If you are unsure,
consult the equipment manufacturer.
WARNING
Never install a suction-line filter-drier in the liquid line
of an R-410A system. Failure to follow this warning
can cause a fire, injury or death.
Precautions during line installation
• Install the lines with as few bends as possible. Take
care not to damage the couplings or kink the tubing.
Use clean hard drawn copper tubing where no
appreciable amount of bending around obstruction
is necessary. If soft copper must be used, take care to
avoid sharp bends which may cause a restriction.
• Install the lines so that they do not obstruct service
access to the coil, air handling system, or filter.
• Take care to isolate the refrigerant lines to minimize
noise transmission from the equipment to the
structure.
• Insulate the vapor line with a minimum of 1/2 in.
foam rubber insulation (Armaflex or equivalent).
Liquid lines exposed to direct sunlight, high
temperatures, or excessive humidity must also be
insulated.
• Tape and suspend the refrigerant lines as shown. Do
not allow tube metal-to-metal contact. See Figure 3.
• Use PVC piping as a conduit for all underground
installations as shown in Figure 4. Buried lines must
be kept as short as possible to minimize the build
up of liquid refrigerant in the vapor line during long
periods of shutdown.
Figure 3: Installation of vapor line
• Pack fiberglass insulation and a sealing material such
as permagum around refrigerant lines where they
penetrate a wall to reduce vibration and to retain
some flexibility.
• For systems with total line length exceeding 80 ft
(22.86 m), refer to Piping Application Guide (P/N
247077) for vapor and liquid line sizing, calibration
of liquid line pressure loss or gain, determination
of vapor line velocity, elevation limitations, TXV
connections, system charging, traps, and crankcase
heater.
Installation Manual: R-410A Outdoor Split-System Heat Pump - YH2F, THF2, RHP150 Series 9
Johnson Controls Ducted Systems