9
Number
Component
1
Control and electrical box
2
Main controller
3
Manometer
4
Expansion vessel
5
Expansion vessel charge valve
6
Automatic air vent
7
Booster heater
8
Drain cock
9
Water circulation pump
10
Pressure relief valve
11
Flow switch
13
Strainer valve
A
Inlet from space heating/Indirect DHW tank (pri-
mary return)
B
Inlet from heat pump
C
Outlet to heat pump
D
Outlet to space heating/Indirect DHW tank (primary
fl ow)
E
Discharge from pressure relief valve (installer to
pipe connect to suitable drain point)
1
2
3
<EHPX> (Packaged model system)
4
7
8
9
10
11
13
E
6
5
A
B
C
D
Figure 4-5
Figure 4-6
OCH532A
