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Turn on fill rig and pump propylene glycol. If pumping out water, have an empty bucket on the
drain port hose to collect water until the color of antifreeze returns. Then put drain port hose
into antifreeze bucket for circulating antifreeze. Run the charge pump until no air bubbles
are seen returning to the bucket. Periodically close drain port to allow pressure to build, then
reopen to purge any air that may be trapped. Watch for air escape. Repeat this procedure until
air is no longer returning to the fill rig pail.
To complete system fill and charge, close the drain port and fill system to pressure of 30 to 35
psi. Close fill port and turn off charge pump. Turn center ball valve of “Regusol fill and flush”
parallel to direction of flow to have propylene glycol flow throughout solar closed loop installa-
tion with the system pump in operation. Cover fill and drain ports with hose caps.
Open air vent atop solar collector to eliminate any air trapped at the high point of the system.
Next open the air vent to remove air from the deaerator at the Regusol 130 EL.
Commissioning the System
Before activating system the following checks should be made:
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System filled with water (tank).
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Appropriate cold and hot water bypass valves are set for series water flow through tank(s).
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Collector and tank sensors connected.
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Regusol is wired and solar loop is air-tested for leaks.
The collector loop can now be filled with the recommended anti-freeze.
Once the solar loop is filled, place Regusol thermometer handles in the fully open position and
the fill and flush valve in fully open position.
Plug in the Regusol controller for operation.
Controller will start and be in automatic mode of operation.
Digital display and indicator light should illuminate.
If the collector temperature is above the tank temperature by 12º F, the circulator should start
and run. Flow meter will indicate circulation. If there is noise of air circulating through the
pump, the system must be recharged to remove air bubbles. Solar closed loops must be free
of air bubbles.
If the collector temperature is below the tank temperature, circulator should not run.
If circulator is not running, set the controller to the “On” position (see Operation and Control-
ling the Regusol Controller) to check circulator operation and indication of flow. Remember to
leave the solar controller set in the “Auto” mode of operation when completed.
If circulator fails to operate, refer to Troubleshooting checks on the following pages.
It is unlikely that system malfunctions will develop within the Regusol. Should they occur,
however, the following procedures will prove helpful. Several of the procedures indicated re-
quire the use of test equipment, such as a volt-ohmeter with 10K scale. If this equipment is not
available to you, contact your authorized Oventrop dealer or distributor for service.
