830867-BIM-B-0412
Johnson Controls Unitary Products
3
GROUND INSTALLATION
The unit should be installed on a solid base that is 2” above grade and
will not shift or settle, causing strain on the refrigerant lines and possible
leaks. Maintain the clearances shown in Figure 1 and install the unit in a
level position. The base pad should not come in contact with the foun-
dation or side of the structure because sound may be transmitted to the
residence.
The length of the refrigerant tubing between the outdoor unit and indoor
coil should be as short as possible to avoid capacity and efficiency
losses. Excessive spacing of the outdoor unit from the home can result
in the refrigerant lines being restricted by trampling or being punctured
by lawn mowers. Locate the outdoor unit away from bedroom windows
or other rooms where sound might be objectionable.
Adverse effects of snow or sleet accumulating on the outdoor coil can
be eliminated by placing the outdoor unit where the prevailing wind
does not blow across the unit. Trees, shrubs, corners of buildings, and
fences standing off from the coil can reduce capacity loss due to wind
chill effect.
Provide ample clearance from shrubs to allow adequate air to pass
across the outdoor coil without leaves or branches being pulled into the
coil.
ROOF INSTALLATION
When installing units on a roof, the structure must be capable of sup-
porting the total weight of the unit, including a pad, lintels, rails, etc.,
which should be used to minimize the transmission of sound or vibra-
tion into the conditioned space.
LIQUID LINE FILTER-DRIER
The air conditioning unit’s copper spun filter/dryer is located on the liq-
uid line.
PIPING CONNECTIONS
The outdoor condensing unit must be connected to the indoor evapora-
tor coil using field supplied refrigerant grade (ACR) copper tubing that is
internally clean and dry. Units should be installed only with the tubing
sizes for approved system combinations as specified in tabular data
sheet. The charge given is applicable for total tubing lengths up to 15
feet. See Application Data Part Number 036-61920-000 for installing
tubing of longer lengths and elevation differences.
REFRIGERANT LINE
1. Refer to the tabular data sheet for the correct line set kit part num-
ber for your unit.
a. Check the size of the pre-charged refrigerant lines to insure that
they are correct for the model being installed.
b. Check the final routing of the tubing, and insure tubing will be of
adequate length, with allowance for connection at the coil and
outdoor unit.
The line set part number, size, and length are shown in the tabular data
sheet. Do not use any line sets other than those shown. Refer to the
appropriate line set Installation Manual.
2. Copper tubing will work-harden (for copper tubing only).
a. The pre-charged tubing should be handled carefully.
b. Do not bend or work the tubing any more than necessary. (The
larger size tubing 3/4" for example, will work-harden rapidly as it
is formed. As the tubing becomes harder, it is more susceptible to
kinking and damage).
3. Forming Copper (for copper tubing only).
a. No attempt should be made to bend the suction line in a shorter
radius than 12". See Figure 2.
4. How to dispose of excess tubing.
a. Tubing may be longer than required. Coil excess tubing nearer
the indoor coil rather than the outdoor unit.
b. Excess tubing must be coiled horizontally so the flow of refriger-
ant is from top to bottom of the coil and toward the outdoor unit.
Another method is to form a horizontal “U” large enough to take
care of excess. See Figure 3.
5. Slope tubing toward outdoor unit.
Replacements for the liquid line drier must be exactly the same as
marked on the original factory drier. See Source 1 for O.E.M.
replacement driers.
Failure to do so or using a substitute drier or a granular type may
result in damage to the equipment.
Using a larger than specified line size could result in oil return prob-
lems. Using too small a line will result in loss of capacity and other
problems caused by insufficient refrigerant flow. Slope horizontal
vapor lines at least 1" every 20 feet toward the outdoor unit to facili-
tate proper oil return.
NOTICE
NOTICE
Do not remove protective caps from couplings until pre-charged lines
are routed and ready for final connection. Protective caps prevent dirt
from entering couplings and contaminating system when connected
together.
FIGURE 2:
Minimum Suction Line Form (Copper Tubing Only)
FIGURE 3:
Excess Tube
12“
12“
Center Point
