5443703-LTG-B-0418
Johnson Controls Unitary Products
5
LIMITATIONS
The unit should be installed in accordance with all National, State and
Local Safety Codes and the limitations listed below:
1. Limitations for the indoor unit, coil, and appropriate accessories
must also be observed.
2. The outdoor unit must not be installed with any duct work in the air
stream. The outdoor fan is the propeller type and is not designed to
operate against any additional external static pressure.
3. The maximum and minimum conditions for operation must be
observed to ensure a system will give maximum performance with
minimal service.
4. The maximum allowable equivalent line length for this product is 80
feet.
Standard Lineset Applications
Maximum allowable lineset varies depending on the vertical separation
between the evaporator and condenser. See Table below for allowable
line set lengths and sizing.
Unit Reduced Capacity Conditions
Minimum / Maximum Operating Limit Conditions
AIR TEMPERATURE AT
OUTDOOR COIL, ° F (° C)
AIR TEMPERATURE AT
INDOOR COIL, ° F (° C)
Min.
Max.
Min.
Max.
DB Cool
DB Cool
WB Cool
WB Cool
35(2)*
125(52)*
57(14)
72(22)
*
Reference the NOTICE under the “Unit Reduced Capacity Conditions”
section.
Allowable Vertical Linesets
Model
Liquid
Line
Suction
Line
Max Line
Length -
Units on
Equal Level
Max Suction
Line Riser - If
OD Unit is
Above ID Unit
Max Liquid
Line Riser - If
OD Unit is
Below ID Unit
24
3/8”
3/4”
80 feet
25 feet
25 feet
36
48
7/8”
60
NOTICE
Inverter Temperature Protection:
If excessive inverter temperatures are sensed, the compressor speed
/ capacity is reduced until an acceptable condition is reached.
When the inverter temperature returns to an acceptable level, the
system returns to normal operation.
Over / Under Current Protection: If a low or high Current Condition
is sensed, the compressor speed / capacity is reduced until an
acceptable current level is reached.
When the system reaches an acceptable current level, the compres-
sor and fan return to normal operating conditions.
Over / Under Voltage Protection: If a low or high supply Voltage
Condition is experienced (below 187 VAC or above 265 VAC), the
compressor speed / capacity is automatically reduced until an accept-
able voltage level is sensed.
When an acceptable voltage level is sensed, the system automati-
cally returns to a normal state of operation.
High Altitude Protection: If the unit is installed in Altitudes of 6,500
ft / 2,000 m above sea level or higher, the compressor and outdoor
fan reduce speeds to protect the system. It is not recommended
these units be installed at altitudes greater than 6,500 ft / 2,000 m
above sea level.
Low Ambient Protection:
Cooling Mode: The unit automatically adjusts to maintain cooling
operation in outdoor ambient conditions down to 35° F (2° C). The
unit reduces capacity and Low Ambient Protection (cooling mode) or
cycles off if asked to provide cooling when the outdoor temperature is
at or below these conditions.