Flowrate
(L/min)
Temp Rise (
o
C)
Temp Rise (
o
C)
Temp Rise (
o
C)
Temp Rise (
o
C)
Temp Rise (
o
C)
Flowrate
(L/min)
AP-10
(648W)
AP-18
(1166W)
AP-20
(1296W)
AP-22
(1425W)
AP-30
(1944 W)
1
9.3
16.7
18.6
20.4
27.9
2
4.6
8.4
9.3
10.2
13.9
3
3.1
5.6
6.2
6.8
9.3
4
2.3
4.2
4.6
5.1
7.0
5
1.9
3.3
3.7
4.1
5.6
c) Use a flow meter/setter to confirm the flow-rate through the system.
d) If the system is not achieving the desired flow, troubleshooting can include:
• Checking for air lock in the collector or flow and return lines; repeat air-purge process.
• Check operation of the non-return valve.
• Pump operation. Pump may not be bled of air, or there may be cavitation (air bubbles forming) due to
installation issues.
• Pump may not have sufficient head pressure.
e) Always use hot water rated pumps (up to 110
o
C / 232
o
F)
f) Always install the pump on the flow line (tank > collector). The pump should have an integrated non-return valve,
or brass non-return installed after the pump to prevent reverse flow of high temperature liquid which could damage
the pump.
g) Pressure drop through an Apricus 30 tube header with cold water at 3L/min is only 1kPa. See graph below for
pressure drops at flow rates up to 15L/min.
0
0.25
0.5
0.75
1
1.25
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
AP-30 Pressure Drop Curve
Metr
es of head
Flow-rate (L/min)
Apricus Solar Collector Installation and Operation Manual - International Edition
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2013 – Apricus Solar Co., Ltd A11-01.1.1-PB-V16 Page 18 of 27
