DIRECT
SPECIFICATION
17
10
3
2
4
1
1
11
19
7
14
9
8
13
18
2
A
C
D
E
F
C
D
E
F
B
A
B
2
1
11
5
7
14
3
10
6
8
DIMENSIONS
2
Primary
circuit flow
Key to Symbols Schematic -
Connection
A
B
C
D
E
F
Threads
G1”
G1”
G ¾’
G ½”
G ½’
G ¾’
Pitch
A
to
B
65mm
C
to
D
65mm
E
to
F
65mm
Height
630mm
Width
550mm
Depth
(inc cover) 265mm
Weight
16 Kg
25 ITEM COMPONENT REFERENCE: LOGIC HIU DIRECT MT & LOGIC HIU DIRECT HT
1 Primary isolation valve (incorporating pressure test points)
2 Drain cock
3 Heat meter spacer piece - replaced by heat meter
when fitted
4 Primary filter and heat meter probe pocket
5 Heating circuit on/off valve
7 Modulating primary control valve (DHW)
8 Plate heat exchanger (DHW)
9 DHW temperature sensor
10 DHW flow switch
11 Electronic control unit
12 Room controller (not supplied)*
13 Heating flow temperature sensor
14 Temperature control stat
17 Pump safety bypass and DP switch
18 Pump
19 Modulating heating control valve
20 Differential pressure control valve (DPCV)
see Hardware Page 19 (Frame 35)
* Not shown on Components illustration.
26 TECHNICAL SPECIFICATION
LOGIC HIU DIRECT 50MT
LOGIC HIU DIRECT 50HT
2
Primary
circuit return
2
Domestic
hot water
outlet
2
Domestic
cold water
inlet
2
Heating
circuit return
2
Heating
circuit flow
16
LOGIC HIU
-
Installation & Servicing / Users