2
A
Thermistors (5K NTC, R = 5K Beta = 3980 : at 25°C
B
Mode select (require volt free inputs)
C
5 wire connector to CN52 on PQFY (1 = black)
D
Immersion heater output
E
Connection to TH1H on PQFY
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1
TH1H
CN52
5
0v
+
IH Drive
5v 10mA
T
1
(
D
H
W
)
T
2
(
U
F
H
)
T
3
(
U
F
C
)
D
H
W
S
E
L
E
C
T
U
F
H
S
E
L
E
C
T
U
F
C
S
E
L
E
C
T
UFC
SET
10-20
DHW
SET
41-55
UFH
SET
30-45
A
B
C
D
E
Set Switches
using BCD
encoding*
Switch ‘ON’
represents
‘8’
‘4’
‘2’
‘1’
Set value =
BCD
setting
+ 40°C**
Set value =
BCD
setting
+ 30°C
Set value =
BCD
setting
+ 10°C***
* See table 2.1 for more detailed explanation of BCD encoding
** All DHW switches OFF gives 45°C with Immersion Heater Signal
*** UFC settings above 20 are treated as 20
[Fig. 5.1]
