Service and Parts Manual (2019, 2020, 2021, 2022)

67 PB
OPERATION
Control Logic Description
ΔT=T1 - T s
Runni ng mode
Auto Mode
This mode can be chosen with remote controller and the setting temperature can be changed
between 61°F~86°F(16°C~30) .
In auto mode, the unit will choose cooling, heating or fan -only mode according to ΔT ( ΔT
=T1 -Ts).
Cooling
ΔT＞3 7°F(3°C)
27°F(-3 ) ≤ ΔT≤ 37°F(3°C)
Fan-only
ΔT ＜27°F(-3°C)
Heating
Indoor fan will run at auto fan of the relevant mode. The louver operates same as in relevant
mode. If the compressor keeps stopping for 10 minutes or the setting temperature is modified ,
the machine will choose mode according to ΔT again.
Evaporator Low -tem perature Protection
DC -Inverter
AC will enter T 2 protection if any of the following condition is satisfied.
Condition:
TE6
T2
On
Off
TE5
Cooling mode : When the indoor coil tem p. T2 keeps lower than TE5 for 120 seconds ,
the compressor and outdoor fan will shut of f. When T2 is higher than TE6 , the
compressor and outdoor fan will restart.