Specifications
Function
Description
2.3. dTMin tank1
Difference (ΔT) between collector temperature (T1) and Tank1 temperature 
(T2) that will automatically disengage pump1. Set to 4
°
F
2.10. Mintemp Collector
Select the minimum collector temperature required for system start-up. Set to 
85
°
F
2.11.1. Thermostat Start
When the water temp. at the location of T3 drop below this setting P3 will start. 
Set to 125
°
F
2.11.2. Hysteresis
When the water temp. at the location of T3 exceeds the Start temperature plus 
the Hysteresis setting, P3 will shutoff. Set to 30
°
F
7.12. Replace Front Case
Push the front case into place while making sure to feed the pump power  cable through the hole into the 
controller enclosure. The casing will simply lock into place.
8. Direct Flow Pump Station Installation
 NOTICE
The  following  instructions are  specific  to  the Apricus  Direct  Flow  Pump  Station,  which  is 
designed for use in Apricus OG-300 certified open loop systems.
8.1. Design
a) The Apricus  Direct Flow  Pump Station (ADFPS)  is  specifically  designed for  use with the Apricus  solar 
collector in a direct flow format. It is NOT suitable for closed loop or drain-back systems.
b) The ADFPS has the following key features:
☀ Single Speed Stainless Steel Grundfos pump (with integrated check valve)   
☀ Controller mounted directly into pump station    ☀ 3/4” Quick connector push fittings 
☀ 75 psi pressure relief valve            ☀ Flow meter with built in balancing valve
☀ Power outage drain valve for freeze protection even without power. 
8.2. Direct Flow Pump Station Technical Data
Pump Station
Direct Flow
Overall Depth 
8.375” / 213 mm (With Insulated Cover)
Overall Height 
24.5” / 622 mm
Overall Width 
17.5” / 444 mm
Weight (Empty)
 24 lb. /10.9 kg.
Solar Connection
¾” (7/8” OD copper) Quick Connect Fitting
Tank Connection
¾” (7/8” OD copper) Quick Connect Fitting
Pressure Relief Valve Connection
¾” FPT
Pressure Relief Valve Pressure
75psi / 5.1bar
Apricus Solar Collector Installation & Operation Manual - USA
Copyright © 2011 – Apricus Inc Doc: A7-05.4.12-PB Page 63 of 129










