Johnson Controls (H, Engineering Manual

Page: 65 / 124

OUTDOOR UNITS
TC-16006
2-43
2.12 Operation Range
This unit has been designed for cooling operations under low ambient temperatures down to 14°F (-10°C)
7
3),
7
4)
.
This wide temperature range enables cooling even in winter in buildings with high internal heat resulting
from lighting, people, and machines, particularly in areas such as shops, lecture rooms, and data processing
areas. Heating units can operate under low ambient temperature down to -13°F (-25°C).
Temperature
Maximum Minimum
Cooling
Operation
Indoor 89
o
F DB/73
o
F WB (32
o
C DB/23
o
C WB) 69
o
F DB/59
o
F WB (21
o
C DB/15
o
C WB)
Outdoor 118
o
F DB (48
o
C DB)
*1), *2)
14
o
F DB (-10
o
C DB)
*3), *4)
Heating
Operation
Indoor 80
o
F DB (27
o
C DB) 59
o
F DB ( 15
o
C DB)
Outdoor 59
o
F WB (15
o
C WB)
*5)
-13
o
F WB (-25
o
C WB)
*6), *7)
DB: Dry Bulb, WB: Wet Bulb
*1) When the outdoor air temperature is 100
o
F DB (38
o
C DB) or more and the outdoor unit operation capacity
ratio is 100% or more, the outdoor unit will be Thermo-OFF to protect the compressor from failure.
*2) When the outdoor air temperature is 109
o
F (43
o
C) or more during the outdoor unit cooling operation, the
maximum connectable indoor unit capacity ratio is 100%.
*3) When the outdoor air temperature is 23
o
F (-5
o
C) or less during the outdoor unit cooling operation, the
minimum connectable indoor unit capacity is 18,000 Btu/h.
In this case, installing the snow protection hood (optional part) is required.
*4) When operating the outdoor unit under the low cooling load conditions and in the low outdoor air
temperature, (approx. 50
o
F DB (10
o
C DB) or less), the indoor unit will be Thermo-OFF to prevent the heat
exchanger of the indoor unit from being frosted.
*5) When operating the outdoor unit under the low heating load conditions and the outdoor temperature is
59
o
F DB (15
o
C DB) or more, the outdoor unit will be Thermo-OFF to protect the compressor from failure.
*6) When the outdoor temperature is lower than 14
o
F (-10
o
C) select the combination of indoor units and
outdoor unit as the total capacity of indoor units not to exceed the capacity of outdoor unit.
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Ɣ This manual should be considered as a permanent part of the air conditioning equipment and should
remain with the air conditioning equipment.
Thermo-ON: The outdoor unit and some indoor units are running.
Thermo-OFF: The outdoor unit and some indoor units stay on, but don’t run.
Cooling Operation
90/74(32/23) 70/59(21/15)
Indoor Air Inlet Temperature o F DB/WB ( o C DB/WB)
Outdoor Air Temperature
o
F DB (
o
C DB)
14(-10)
(
/
3)
50(10)
118(48)
(
/
2)
Heating Operation
80(27) -9.5(15)
Indoor Air Inlet Temperature o F DB ( o C DB)
Outdoor Air Temperature
o
F WB (
o
C WB)
-13(-25)
59(15)
Continuous Operation
Working Range (
/
1)(
/
4)
Continuous Operation
Working Range (
/
5)