Lochinvar SCH-I-O operation manual System Start-up, Filling, flushing and bleeding

6 System Start-up

Start-up

Check/control water chemistry

￿CAUTION Do not use petroleum-based cleaning or sealing compounds in the system.

Damage to elastomer seals and gaskets in the system could occur, resulting in substantial property damage.

Test/replace freeze protection fluid

1.For systems using freeze protection fluids, follow fluid manufacturer’s instructions.

2.Freeze protection fluid must be replaced periodically due

to degradation of inhibitors over time. Follow all fluid manufacturer’s instructions.

Freeze protection

1.Determine freeze protection fluid quantity using system water content, following fluid manufacturer’s instructions. Remember to include expansion tank water content.

2.When using freeze protection fluid with automatic fill, install a water meter to monitor water makeup. Freeze protection fluid may leak before the water begins to leak, causing concentration to drop, reducing the freeze protection level.

3.The freeze protection set points may be lowered when freeze protection fluid is used (see the Lochinvar Solar Differential Control Manual).

Glycol

Aqueous solutions of Dowfrost HD fluid are designed to provide freeze/burst and corrosion protection, as well as efficient heat transfer, in water-based, closed-loop heating and air-conditioning systems.

Dowfrost HD fluid has an operating temperature range of -50°F to 325°F; with fluid freeze protection to below -60°F and system burst protection to below -100°F. The fluid contains corrosion inhibitors that are specially formulated for HVAC systems to keep pipes free of corrosion without fouling.

Thermal protection

￿ WARNING	Thermal expansion tanks should be sized
	to account for 1.5 times the solar system
	circuit volume.

￿WARNING A properly sized expansion tank must be used to avoid damage to the Solar

Thermal System.

￿WARNING The expansion tank may be hot, ensure scalding does not occur.

In heated water systems, a warning instruction must be provided by the operator near the expansion tank, if persons are endangered by excessive surface temperatures.

SCH Collectors Installation & Operation Manual

￿ WARNING	Failure to heed these instructions, especially
	the safety instructions, can result in the
	destruction of and defects on the expansion
	tank, endanger persons, and impair the
	operation.

Final checks before starting the system

Read the Lochinvar/TiSun Differential Control Installation and Operation Manual to familiarize yourself with differential control operation. Read this manual and follow the proper steps to start system.

Verify the collector and system are full of water and all system components are correctly set for operation.

Verify electrical connections are correct and securely attached.

￿ WARNING	All piping should be properly insulated to
	avoid freezing and burn potential.

Filling, flushing and bleeding

■There is one fill valve with hose connection for filling, flushing and draining the solar system on both the safety group and sensor measurement section.

■Connect the pressure hose (forward flow) to the safety group’s filling connection under the pressure gauge and open fill/flush valve.

■Connect the flushing hose (return) to the flushing connection on the sensor measuring section and open fill/flush valve.

■Refer to “Operation, multi-function ball valve and check valve” on page 38.

■Open the supply ball valve (by turning the red thermometer handle counter-clockwise until it stops).

■Close return ball valve (by turning the blue thermometer handle clockwise, until it stops).

■If necessary, the supply and return check valve can be opened by moving the thermometer handles to the 45° position.

■Put sufficient solar liquid in the tank of a filling and flushing pump (not supplied). The mixing ratio should be adapted to local conditions in terms of freeze protection.

■Fill the solar system via the filling and flushing pump and then flush the solar circuit for at least 15 min. to purge all of the air out of the circuit.

■Close the fill/flush valve (return) with the filling and flushing pump running and increase the system pressure to 60 psi. The system pressure can be read at the pressure gauge.

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