5547666-CTG-A-0718
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 that 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 2 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
Heat
DB Cool
DB
Heat
WB
Cool
DB
Heat
WB
Cool
DB
Heat
35(2)* -20(-29) 125(52)* 75(24) 57(14) 50(10) 72(22) 80(27)
*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 1-1/8”
NOTICE
Intelligence Power Module (IPM) Temperature Protection:
If excessive (IPM) inverter temperatures are sensed, the compressor
speed / capacity is reduced every 60 seconds 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 every 30 seconds 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 197
VAC or above 252 VAC), the compressor speed / capacity is auto-
matically reduced every 15 seconds until an acceptable voltage level
is sensed.
When an acceptable voltage level is sensed, the system automati-
cally returns to a normal state of operation.
High Outdoor Ambient Temperature Protection:
During high outdoor ambient temperature conditions above 109°F
(43°C), the compressor speed reduces to protect the system. If the
outdoor ambient temperature goes above 125 °F (52°C), the system
goes into a soft-lockout condition halting operation for system protec-
tion. Consider these limitations when installing any of the heat pumps
included in this document.
When the system reaches acceptable operating conditions, the sys-
tem returns to normal 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 or cycles off if asked to provide cooling
when the outdoor temperature is at or below these conditions.
Heating Mode: The unit provides compressor heat down to an out-
door ambient temperature of -20° F (-29° C). As the outdoor ambient
temperature reduces, available heat reduces for all air source heat
pumps. Make sure the balance point and auxiliary heat are appropri-
ately set and sized for the application of the heat pump.
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