Evaporator Low Temperature T2 Protection; Auto-Mode; Drying Mode - koppel KV24 ODU-ARF21C Service Manual

Control Function
Electrical

1.3.2.3 Evaporator low temperature T2 protection.

---T2<0℃, the compressor will stop and restart when T2
---0℃≦T2<4℃, the compressor frequency will be limited and decreased to the lower level
---4℃≤T2<7℃, the compressor will keep the current frequency.
---T2>7℃, the compressor frequency will not be limited.
1.3.2.4 Condenser high temperature T3 protection
.

1.3.3 Auto-mode

This mode can be chosen with remote controller and the setting temperature can be changed between
17~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to ∆T (∆T =T1-Ts).
Indoor fan will run at auto fan of the relevant mode.
The louver operates same as in relevant mode.
If the machine switches mode between heating and cooling, the compressor will keep stopping for 15
minutes and then choose mode according to T1-Ts.
If the setting temperature is modified, the machine will choose running function again.

1.3.4 Drying mode

Indoor fan speed is fixed at breeze and can't be changed.
All protections are active and the same as that in cooling mode.
Low indoor room temperature protection
In drying mode, if room temperature is lower than 10℃, the compressor will stop and not resume until room
temperature exceeds 12℃.
94
>=
5℃.
T3
Off
Decrease
Hold
Resume
T1-Ts
Cooling
Fan only
Heating*
Electrical Control System