Johnson Controls DOA096B21S Series Engineering Manual page 11

■ Operation Range
19.4 23
(-7) (-5)
NOTES:
1. The above figure shows the sensed temperature of inlet air thermistor for the DOAS unit.
2. When the outdoor air intake temperature is 32
freeze protection of the heat exchanger.
However, when the condition is such that the heating operation is not available, the operation is stopped.
3. When the outdoor air intake temperature is 19.4
protection of the heat exchanger from freezing and/or a cold draft.
In addition, even when it is within the operation range, the operation might be stopped for unit protection.
4. During the heating operation, when the outdoor air intake temperature is 59
operation is changed to fan operation.
5. When starting the heating operation or defrosting operation, the fan function is stopped by setting the optional
function setting in the wired controller. Constant air volume mode is available in order to keep the air speed
constant. (If it is in abnormal condition, the fan function will stop.) Refer to the Service Manual for details.
6. During cooling operation, when the outdoor air intake temperature is 68
is changed to fan operation.
When the outdoor air intake temperature is 109.4
though the alarm might be stopped by increasing pressure due to being out of operation range.
In addition, when the outdoor air intake temperature is high (approx. 104
o
(approx. 73.4 F DB (23
protection.
TC-16005-rev.2
Heating Operation
Available Range
32 41 50 59
(0) (5) (10) (15)
Outdoor Air Intake Temperature [
o
C DB) or less) the cooling operation and the fan operation might be alternated for unit
Fan Cooling Operation
Operation Available Range
68 77 86
(20) (25) (30)
F DB ( C DB)]
o o
o o
F DB (0 C DB) or less, the heating operation is started for
o o
F DB (-7 C DB) or less, the heating operation is stopped for
o
o o
F DB (43 C DB) or more, the fan operation can continue,
95 104 109.4
(35) (40) (43)
o o
F DB (15 C DB) or more, the
o
F DB (20 C DB) or less, the operation
o o
F DB (40 C DB) or more) or low
FEATURES
1-3