Lochinvar SCH-I-O operation manual System Start-up continued, Clamp ring screw connections

6 System Start-up (continued)

■Close the fill/flush valve (forward flow) and switch off the filling and flushing pump.

■Open return ball valve (by turning the blue thermometer handle 90° counter-clockwise until it stops).

■The solar system features an air separator. Open the bleeder valve until the solar liquid exits free of air bubbles.

■Only if collector bleeder is installed: Bleed the system on the collector until the solar liquid exits free of bubbles.

■If necessary, increase the test pressure again to 60 psi and check the system for leaks. If the pressure gauge shows the pressure dropping substantially, you have a leak in the system.

■Set the operating pressure to 60 psi as prescribed by the system manufacturer.

■Start up the circulation pump at maximum speed and allow liquid to circulate for at least 15 min.

■Remove the filling station hoses and screw the caps on the flushing and filling valves.

■Check the system again for leaks. Use the red and blue thermometer handles to fully open the forward flow and return ball valves.

■Activate speed control on solar control unit. The highest speed level should be set on the pump (phase control).

Note: The minimum speed set on the solar control unit must not fall below the pump’s minimum nominal speed. Note instructions for pump and solar control unit.

■Once the installation settings have been completed and checked, fit the solar station’s front insulation shell.

■Refer to the collector manufacturer’s recommendations for minimum flow requirements.

Clamp ring screw connections

SCH Collectors Installation & Operation Manual

Flat seal screw connections

■All pre-fitted solar station screw connections are firmly tightened in the factory so that they do not need to be retightened.

Torque levels when tightening flat seal screw connections using AFM 34 flat seals, s = 2mm.

–3/4" screw connection 26 Ft. lb

–1" screw connection 40 Ft. lb

–1 1/4" screw connection 66 Ft. lb

–1 1/2" screw connection 96 Ft. lb

Operation, multi-function ball valve and check valve

■The forward flow ball valve must be open for filling, flushing and bleeding solar systems with a filling and flushing pump. The return ball valve should be closed.

■Both flow checks should be opened in order to bleed the solar system (thermometer handles in 45° position).

■The two mult-function ball valves must be fully open in order to bleed the solar system (turn the red and blue thermometer handles counter-clockwise until the stop is reached).

Figure 6-1Forward flow multi-functioning instruments

SETTING FOR OPERATIONS,	DRAINING	SERVICE
FILLING, FLUSHING, DRAINING	FLOW CHECK OPEN	BALL VALVE
FLOW CHECK CLOSED	BALL VALVE 1/2 OPEN	CLOSED
BALL VALVE OPEN

Figure 6-2Return multi-functioning instruments

■Cut the copper pipe to length and deburr.

■First, slide the clamp ring nut over the pipe, then clamp the ring itself.

■Insert the prepared pipe into the screw connection until its stop is reached.

■Tighten clamp ring nut by hand.

■Use open-ended wrench to tighten clamp ring screw connection (approximately 33 ft. lb.), retighten if necessary.

■When tightening the clamp ring screw connection, use two wrenches–using one wrench to prevent the pumping station from turning.

SETTING FOR OPERATIONS	DRAINING	SERVICE, FILLING FLUSHING
FLOW CHECK CLOSED
	FLOW CHECK OPEN	BALL VALVE CLOSED
BALL VALVE OPEN
	BALL VALVE 1/2 OPEN

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