Friedrich FPHMR18A3A Service Manual page 50

Control Logic Description
Auto Mode
This mode can be chosen with remote controller
changed between 61°F~86°F(16°C~30
In auto mode, the machi ne will choos e cooling, heatin g or fan-only mode according to
T ( T =T1 -Ts).
Indoor fan will run at auto fan of the relevant mode.
relevant mode. If the compressor keep stopping for 10 minutes or the setting
temperature is modified, the machine will choose mode according to
Evaporator low -temperature Protection
Condition:
Cooling:
Indoor coil temperature (T2) is lower than TE5 (logical calculation between 28F-35F) for 2 minutes,
Outdoor fan and compressor will turn o . When Indoor coil temperature (T2) is higher than TE6
(logical calculation between 50F-55F) the compressor and outdoor fan will restart.
50
OPERATION
T=T1 -Ts
T＞5.4°F
≤ T≤ 5.4°F
-5.4°F
-5.4°F
T ＜
T2
On
TE6
TE5
Off
and the setting temperature can be
).
Running mode
Cooling
Fan -only
Heating
The louver operates same as in
T again.