The following guidelines should be followed when installing
refrigerant piping.
1.
Run the tubing by the most direct route and support every
few feet. Do not run the lines underground unless they are in
a chase.
2.
Insulate the vapor line to prevent sweating and line loss. In
underground chases, the vapor line should be insulated to
provide vibration isolation between the vapor and liquid line.
A minimum of
3
/
8
" insulation is recommended in conditioned
space and
1
/
2
" to
3
/
4
" in unconditioned spaces.
3.
Refrigerant line length MUST NOT exceed 75' on horizontal
runs and 40' on vertical risers.
4.
In general, the piping should be sloped toward the outdoor
unit to prevent oil trapping. Where vertical risers occur, a
suction line trap should be located at the base of the riser to
assure proper oil return. If the riser is over 20', an additional
trap should be installed every 20' with a maximum vertical
rise of 40'.
5.
If you are making your own line sets, use only clean air-
conditioning and refrigeration-grade seamless copper
tubing. Plumbing-grade copper is inadequate.
1.
The installer SHALL check available power to make certain it
matches the unit (Name Plate Rating) and that constant
voltage can be maintained to the unit. Unsatisfactory
performance would otherwise result. The local power
company should be contacted regarding problems or
questions concerning power supply.
2.
Install a line service disconnect switch within sight of the
condensing unit. The line voltage service wiring for the
condensing unit should include a fused disconnect switch.
3.
Use correct wire size and fuse size. To ensure that adequate
voltage will be available at the condensing unit, the line
voltage service wiring MUST be of adequate size. Minimum
recommended wire ampacities and maximum fuse sizes are
listed on the unit name plate.
4.
Two holes are provided in the control box.
a. One is for the connection of the line voltage conduit
or cable. The hole is sized for
3
/
4
" conduit.
b. One is for low-voltage wiring. (Refer to the wiring
diagram attached to electrical box cover for
connection.)
5.
Be sure to ground the condensing unit by securing the
ground wire to the grounding lug inside the control box.
6.
Be sure to follow National Electrical Code and all local
codes.
7
REFRIGERANT PIPING
ELECTRICAL HOOK-UP
EVACUATION:
If the installer is making up his
own line sets, he SHALL make sure the tubing is
clean of any impurities or moisture. To ensure a
clean system, free of any contaminants, purging
with dry nitrogen and a deep vacuum is necessary
on all sweat-type models and on the uncharged
portions of all models not incorporating precharged
lines. It is desirable to pull a vacuum to 1,000
microns (29.96" Hg) to ensure trouble-free
operation of the system.
!
WARNING:
ELECTRICAL EQUIPMENT SHOULD BE
INSTALLED BY A QUALIFIED, LICENSED ELECTRICIAN.
IMPROPER ELECTRICAL HOOK-UP MAY DAMAGE
EQUIPMENT, CAN CREATE A HAZARD, CAUSE PERSONAL
INJURY OR DEATH, AND WILL VOID THE WARRANTY.
!
