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SK2017 AHRI PFWSL-V/P-AECM-001
PRE-HEAT
Pre-heat without electrical heater
a)
If Ti1 < 97ºF [or < 82ºF is selected by DIPB-S2 position SW4], MTV1 and AUX1 are on, indoor fan runs at 200rpm.
b)
If Ti1 ≥ 100 ºF [or ≥ 86ºF is selected by DIPB-S2 position SW4], MTV1 and AUX1 are on, indoor fan runs at set speed.
c)
If indoor coil temperature sensor is damaged, pre-heat time is set for 2 minutes and indoor fan runs at set speed.
Pre-heat with electrical heater
a)
If indoor fan speed ≥ 300rpm, electrical heater will turn on.
POST-HEAT
Post-heat without electrical heater
a)
If Ti1 ≥ 100ºF, MTV1 and AUX 1 are off, indoor fan continues to run at set speed.
b)
If 96 °F ≤ Ti1 ≤ 100 °F, MTV1 and AUX1 are off. Indoor fan keeps original state.
c)
If Ti1 < 96ºF, MTV1 and AUX1 are off. Indoor fan runs at 200rpm.
d)
If indoor coil temperature sensor is damaged, post-heat time is set for 3 minutes with indoor fan running at set speed.
Post-heat with electrical heater
a)
Indoor fan will run at 200rpm before the unit turns off for 20 seconds.
Over-heat protection of indoor coil in post-heat
a)
If Ti1 ≥ 167ºF, MTV1 and AUX1 are off, indoor fan remains on and runs at high speed.
b)
If Ti1 < 158ºF, MTV1 and AUX1 are on, indoor fan remains on and runs at set speed.
c)
If indoor coil temperature sensor is damaged, the protection mode will become obsolete and the unit will work
according to the Pre-heat and Post-heat program.
DEHUMIDIFICATION MODE
a)
MTV2, AUX1 and heater are always off.
b)
If Tr ≥ 77 ºF, MTV1 and AUX2 will be ON for 3 minutes, and OFF for 4 minutes.
c)
If 61 ºF ≤ Tr < 77 ºF, MTV1 and AUX2 will be ON for 3 minutes, and OFF for 6 minutes.
d)
If Tr < 61 ºF, MTV1 and AUX2 will be turned off for 4 minutes.
e)
At the end of the above dehumidification cycle, system will decide the next dehumidification control option. Indoor fan
will run at low speed throughout the dehumidification process.
AUTOMODE
Auto cool/heat/heat with electric heater as booster
a)
Every time the unit is turned on, MTV1 is on, AUX1, AUX2 and fan are off. MTV2 and heater are always off.
b)
After 120sec, subsequent operation mode is decided according to following program:
i.
If the coil temperature sensor (Ti1) ≥ 97°F, MTV1, AUX1 and fan turn on or off according to HEAT mode.
ii.
If Ti1 < 97°F, MTV1, AUX2 and fan turn on or off according to COOL mode.
c)
Unit remains in AUTO COOL or AUTO HEAT mode throughout the operating cycle until the user changes the mode
manually or restarts the unit.
d)
Should there be failure of Ti1 sensor, auto mode is not allowed.
Auto heat with electric heater as primary heat source / all configuration auto changeover
a)
If current running mode is auto cool mode, the control logic will change over to auto heat mode when all the following
conditions are met:
i.
Ts-Tr ≥ 1.8°F (or 7.2 ºF if economy contact is activated)
ii.
MTV1 has stop ≥ 10 min.
b)
If current running mode is auto heat mode, it will change over to auto cool mode when all the following conditions are
met:
i.
Tr-Ts ≥ 1.8°F (or 7.2ºF if economy contact is activated)
ii.
MTV1 has stop ≥ 10 min.
Note: Auto cool or auto heat operation are the same as cool or heat mode respectively.