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GROUND INSTALLATION
The unit should be installed on a solid base that is 2" (5.1 cm) 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 con-
tact with the foundation 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.
WALL MOUNT INSTALLATION
Care must be taken to mount the outdoor unit on a solid base that is
sloped to shed water, secure from settlement, and is isolated from the
structural foundation or walls to prevent sound and vibration transmis-
sion into the living space. In addition heat pump units must be elevated
above anticipated snow accumulation levels to allow for proper defrost
drainage and airflow.
On occasion, site conditions may require direct wall mounted brackets
to be used to locate and support the outdoor unit. In these applications,
care must be taken to address unit base pan support, structural integ-
rity, safe access and serviceability, as well as the possible sound and
vibration transmission into the structure. These applications are best
served by a properly engineered solution.
LIQUID LINE FILTER-DRIER
The air conditioning unit's filter/dryer is located on the liquid line.
NOTICE
Replacements for the liquid line drier must be exactly the same as
marked on the original factory drier. See Source1 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.
Filter-Drier
Source 1 Part No.
S1-02922156000
S1-02922157000
S1-02614777712
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
Johnson Controls Unitary Products
Apply with Models
18, 24, 30, 36
48, 60
76
internally clean and dry. Units should be installed only with the tubing
sizes for approved system combinations as specified in tabular data
sheet. The initial charge given is applicable for total tubing lengths up to
15 feet (4.6 m). See Application Data Part Number 247077 for installing
tubing of longer lengths and elevation differences.
NOTICE
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" (2.5 cm) every 20 feet (6.1 m) toward the out-
door unit to facilitate proper oil return.
PRECAUTIONS DURING LINE INSTALLATION
1.
Install the lines with as few bends as possible. Care must be taken
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, care
must be taken to avoid sharp bends which may cause a restriction.
2.
The lines should be installed so that they will not obstruct service
access to the coil, air handling system, or filter.
3.
Care must also be taken to isolate the refrigerant lines to minimize
noise transmission from the equipment to the structure.
4.
The vapor line must be insulated with a minimum of 1/2" foam rub-
ber insulation (Armaflex or equivalent). Liquid lines that will be
exposed to direct sunlight, high temperatures, or excessive humid-
ity must also be insulated.
5.
Tape and suspend the refrigerant lines as shown. DO NOT allow
tube metal-to-metal contact. See Figure 2.
6.
Use PVC piping as a conduit for all underground installations as
shown in Figure 3. Buried lines should be kept as short as possible
to minimize the build up of liquid refrigerant in the vapor line during
long periods of shutdown.
7.
Pack fiberglass insulation and a sealing material such as perma-
gum around refrigerant lines where they penetrate a wall to reduce
vibration and to retain some flexibility.
8.
For systems with total line length exceeding 70 feet (21.3 m), see
APPLICATION DATA and worksheet "General Piping Recommen-
dations and Refrigerant Line Length" for vapor and liquid line siz-
ing, calibration of liquid line pressure loss or gain, determination of
vapor line velocity, elevation limitations, orifice connections, sys-
tem charging, traps, etc.
Sheet Metal Hanger
Liquid
Line
Incorrect
Correct
FIGURE 2: Installation of Vapor Line
TO INDOOR COI L
LI QUID LINE
PVC
CONDU IT
FIGURE 3: Underground Installation
548086-XIM-C-0814
Tape
Insulated Vapor Line
A0151-001
TO OUTDOOR UNIT
INSULA TED
VAPOR LINE
CAP
A0152-001
3
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