Lochinvar 90, 500 Water Treatment, Freeze Protection for a Heating Boiler System if required

Installation & Service Manual

6Start-up(continued)

6.Shut-down and Draining - If for any reason, the appliance is to be shut off, the following precautionary measures must be taken:

(a)Shut off gas supply.

(b)Shut off water supply.

(c)Shut off electrical supply.

(d)Drain the unit completely. Remove one threaded plug or bulbwell from the inlet side of the front header and one from the outlet side of the front header on the heat exchanger. Blow all water out of the heat exchanger.

(e)Drain pump and piping.

Freeze Protection for a Heating Boiler System (if required)

1.Use only properly diluted inhibited glycol antifreeze designed for hydronic systems. Inhibited propylene glycol is recommended for systems where incidental contact with drinking water is possible.

￿CAUTION DO NOT use undiluted or automotive type antifreeze.

2.A solution of 50% propylene glycol will provide maximum protection of approximately -30°F.

3.Follow the instructions from the glycol antifreeze manufacturer. The quantity of glycol antifreeze required is based on total system volume including expansion tank volume.

4.Glycol is more dense than water and changes the viscosity of the system. The addition of glycol will decrease heat transfer and increase frictional loss in the heating boiler and related piping. A larger pump with more capacity may be required to maintain desired flow rates in a glycol system.

5.Local codes may require a back flow preventer or actual disconnect from city water supply when glycol antifreeze is added to the system.

Water Treatment

In hard water areas, water treatment should be used to reduce the introduction of minerals to the system. Minerals in the water can collect in the heat exchanger tubes and cause noise on operation. Excessive build up of minerals in the heat exchanger can cause a non-warrantable failure.

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