Si33-105 Outline of Control (Outdoor Unit) < Symbols using in this manual >
Function R407C PLUS Series Heat Recovery System 81
!
When condition (Th6 – Te < 3 & DSHi<20°C) remains for 3 continuous minutes in steps
higher than step 1-1, EVs of all indoor units in thermostat-ON status are set to 200 pls and
SVP=ON. This is canceled when Th6 – Te > 10 and DSHi>30°C. (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.
!
In this control, the compressor load increase based on PI calculation is conducted once
every 2 minutes. The load decrease operation is conducted once every 20 minutes.
"
Tfin: Inverter fin temperature.
O
M11F : H / L / OFF
M12F : OFF
M11F : OFF
M12F : ON
T fin > 87˚C
T fin < 67˚C
(V0820)
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