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a
Green wire
FS
Water flow switch (TC units)
b
White wire
FSC
Fan speed controller
c
Black wire
HTP
Heater thermal protection
A
Electronic control
HP
High-pressure switch (41 bar)
B
The components in the box are standard acces‐
sories supplied by the manufacturer
K1
Compressor contactor
C
The components in the box are not supplied by
the manufacturer
K2
Auxiliary heater contactor
D, M1
Compressor
K3
Pump contactor (TC units)
E, AH
Auxiliary heater
LAK
Presostatic low ambient kit accessory
F, M4
Pump (TC units)
LP
Low pressure switch (2,5 bar)
H
Install on site
L1, L2, L3
Line phases
I
4 mm
2
Cu
M2, M3
Fan motor 1 and 2
AH
Auxiliary heater
MS
Main switch
B1
Water inlet temperature probe (NTC)
N
Neutral
B2
Water outlet temperature probe (NTC)
Q1
Auxiliary heater thermal magnetic protector
B3
Outdoor temperature probe (NTC)
Q2
General / compressor thermal magnetic protec‐
tor
B4
Fan / defrost speed control ratiometric pressure
probe
Q3
General thermal magnetic protector, 230V / fan /
pump / crankcase heater
C2, C3
Fan condenser
Q4
Pump magneto-thermal protector (TC units)
CH
Compressor crankcase heater
R00
Remote ON / OFF switch
F1
Electronic control protection fuse / 24 V [315 mA
SLOW] switching
RCH
Remote COOL / HEAT switch
F2
Fan speed controller fuse
T
Transformer 230 / 24V 20 VA
FC
Phase control
V4V, G
4-way valves (on YLHA only)
Electric circuit diagrams
2
Electric circuit diagram YLCA/YLHA PLUS 20 TC and T (400.3.50)
2.5
47
Summary of Contents for Ylha plus 12
Page 4: ...1 Installation manual...
Page 40: ...2 Electric circuit diagrams...