Installation Manual 5.1.2
15
6.2 Closed Loop with two or more Systems
When two or more units are connected to one loop,
ONLY ONE auto purge kit is used. It is best if installed
on the highest unit at the highest point but does not
have to be higher than the loop field. Check valves
must be installed on each unit to prevent backward
water flow when the unit is off. The auto purge keeps
proper pressure on the suction side of the pump to
prevent air locking or cavitation from occurring. The
tank must be kept ½ to ¾ full at all times. As shown in
the drawing below, the other unit(s) simply need to
have a pump for each unit.
H
y
d
r
o
-
T
em
p
A
u
t
o
P
u
r
g
e
k
i
t
m
o
un
t
ed at
h
ig
h
es
t
p
oi
nt
Loo
p I
n
Loop
Out
Ho
riz
ontal Swing
Che
ck
Valve
Hyd
ro-
Tem
p
Loo
p I
n
Loo
p Out
H
orizon
tal Swin
g
Ch
eck Val
ve
Wat
er In
Water
Out
Auto-purge
Kit
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