
1.2.1 General diagram
A1
µchiller
2
N
Neutral
A2
µchiller
2
(expansion)
L
Phase
A
Four-way valve
B1
Water inlet temperature sensor (Control set point)
B
Pump
B2
Water outlet temperature sensor (Antifreeze pro‐
tection)
C
Heater
B3
Outdoor temperature sensor (Dynamic set point)
D / K
Compressor 1 / Compressor 2
B4, B8
Radiometric pressure sensor (Fan speed and de‐
frost control)
E
Alarm
ID1
Remote COOL / HEAT Water flow control
F
230 / 24 transformer
ID2
Fan heat switches
G
Fan speed control
ID3, ID8 High-pressure switch
H
Communication
ID4, ID9 Low-pressure switch
I
Programmable key
ID5
Remote ON / OFF
J
Transformer connection
ID7
Flow switch
ID10
General protection
User manual
1
Operating instructions µC2 (YLHA 50, 60 and 80)
1.2
9