Daikin VRV R-407C PLUS Series Service Manual page 59

Outline of Control (Outdoor Unit)
∗ Tfin: Inverter fin temperature.
48
When condition (Th6 – Te < 5) remains for 3 continuous minutes in steps higher than step 1-2, EVs of
all indoor units in thermostat-OFF status are set to 200 pls. This is canceled when Th6 – Te > 15. (for
prevention of wet operation in cooling operation when outside temperature is low)
Th6 – Te: Suction pipe temperature – Evaporation temperature
From 24 HP model or higher, the fan (M12F) on the inverter box side stops if operating at fan tap (3) or
lower. Therefore, Tfin switches M11F OFF and M12F ON.
®­ ¬
M11F : H / L / OFF
M12F : OFF
In this control, the compressor load increase based on PI caluculation is conducted once every 2
minutes. The load decrease operation is conducted once every 20 minutes.
T fin > 87˚C
O
T fin < 67˚C
SiE 00-07
M11F : OFF
M12F : ON
(V0820)
Function R-407C PLUS Series