5724 267 v1.0
7
Primary and secondary loop
Installation
The primary (solar) loop comprises:
a– ball valve with integrated temperature gauge and check
valve, solar supply
b– ball valve with integrated temperature gauge and check
valve, solar return
c– pressure relief valve - 87 psig
d– drain valve for flushing / filling
e– pressure gauge and connection for expansion tank
f– solar 3-speed circulation pump
g– flowmeter to display and balance the flow rate
h– fill valve for flushing / filling
i– double-wall heat exchanger
j– air-scoop with discharge line
The secondary (DHW storage tank) loop comprises:
A– ¾“ male nipple for connection of an ASME
stamped pressure relief valve (PRV ordered
separately, maximum 150 psig)
B– DHW 3-speed bronze circulation pump
C– isolation valve in the storage tank return
D– isolation valve in the storage tank supply
E– temperature sensor DHW return
F– temperature sensor DHW supply
a
b
c
d
e
f
g
h
i
j
A
B
F
E
D
C
Fig. 3 Primary solar loop components
Fig. 4 Secondary tank loop components
The solar ball valves (a and b)
are equipped with spring-
charged check valves to
prevent gravity circulation.
