DO
NOT
locate the unit:
•
Directly beneath a gas appliance termination
vent
•
Within 3 feet of a clothes dryer vent.
•
Where the refreezing of defrost water would
create a hazard.
Where water may rise into the unit. Another important
consideration in selecting a location for the unit(s) is the
angle to obstructions. Either side adjacent the valves can be
placed toward the structure provided the side away from the
structure maintains minimum service clearance.
Corner
installations are strongly discouraged.
SAFE REFRIGERANT
HANDLING
While these items will not cover every conceivable situation,
they should serve as a useful guide.
Use only refrigerant grade (dehydrated and sealed) copper
tubing to connect the condensing unit with the indoor
evaporator. After cutting the tubing, install plugs to keep
refrigerant tubing clean and dry prior to and during
installation. Tubing should always be cut square keeping
ends round and free from burrs. Clean the tubing to prevent
contamination.
Do NOT let refrigerant lines come in direct contact with
plumbing, duct work, floor joists, wall studs, floors, and
walls. When running refrigerant lines through a foundation or
wall, openings should allow for sound and vibration
absorbing material to be placed or installed between tubing
and foundation. Any gap between foundation or wall and
refrigerant lines should be filled with a pliable silicon-based
caulk, RTV or a vibration damping material. Avoid
suspending refrigerant tubing from joists and studs with rigid
wire or straps that would come in contact with the tubing.
Use an insulated or suspension type hanger. Keep both
lines separate and always insulate the suction line.
These sizes are recommended for line lengths of 79 feet or
less to obtain optimum performance. For alternate line sizing
options or runs of more than 79 feet, contact your distributor
for assistance.
RECOMMENDED
INTERCONNECTING TUBING
0-24
25-49
50-79*
Line Diameter (in. OD)
Suct Liq Suct Liq Suct Liq
5/8 1/4 3/4 38 3/4
3/8
* Lines greater than 79 feet in length or vertical elevation changes
more than 50 feet contact your distributor for assistance.
Mounting the evaporator coil above the condensing
unit will require an inverted loop in the suction line
adjacent or near the connection to the evaporator. The
top of the loop must be slightly higher than the top of
the coil.
Mounting the condensing unit above the evaporator
coil will not require an oil trap in the suction line at the
evaporator, except when the condensing unit is over
80 feet above the evaporator.
Insulation is necessary to prevent condensation from
forming and dropping from the suction line. Armflex (or
satisfactory equivalent) with 3/8” min. wall thickness is
recommended. In severe conditions (hot, high
humidity areas) 1/2” insulation may be required.
Insulation must be installed in a manner which
protects tubing from damage and contamination.
Where possible, drain as much residual compressor
oil from existing systems, lines, and traps; pay close
attention to low areas where oil may collect.
NOTE:
Consult manufacturer before changing refrigerant
types.
B
URYING
R
EFRIGERANT
L
INES
If burying refrigerant lines can not be avoided, use the
following checklist.
1. Insulate liquid and suction lines separately.
2. Enclose all underground portions of the refrigerant
lines in waterproof material (conduit or pipe) sealing
the ends where tubing enters/exits the enclosure.
Copyright © 2019 DewAir Corporation
6
RHC18O-IM v2.11 Sep 4, 2019
Liquid Line
Suction Line
