39
General diagram,
YLCA 20,27 and YLHA PLUS 5-27
G0
G
B1
GND
B2
GND
B3
Y
ID5
GND
ID3
ID4
ID1
ID2
B1: WATER INTAKE TEMPERATURE PROBE (SET POINT CONTROL)
B2: WATER DISCHARGE TEMPERATURE PROBE (ANTIFREEZE PROTECTION)
B3: COIL TEMPERATURE PROBE FAN SPEED AND DEFROST CONTROL)
B4: OUTDOOR TEMPERATURE PROBE (DYNAMIC SET POINT)
ID1: WATER FLOW SWITCH
ID2: REMOTE COOL/HEAT
ID3: HIGH PRESSURE SWITCH
ID4: LOW PRESURE SWITCH
ID5: REMOTE ON/OFF
ID4
ID2
ID1
ID3
ID5
W
AT
E
R
D
IS
C
H
A
R
G
E
(
B
2)
W
ATER INT
AKE (B1)
315
mA
24
TRANSFORMER
230
230.1.50
N
L
FAN SPEED
CONTROL
PROGRAMMABLE
KEY
COMMUNICATION
RS 485
No3
X
X
C5
No1
No2
C1/2
No4 C3/4
No5
PUMP
4-W
A
Y
V
A
LV
E
230.1.50
ALARM
COMP
. 1
N
L
C1/2 C3/4
HEA
TER
GND
B4
V+
OUTDOOR PR
OBE (B3)
(B4)
P
PRESSURE PROBE
