Lochinvar 399 Shut-Down and Draining, Freeze Protection for a Heating Boiler System if required

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION Continued

Shut-Down and Draining

If for any reason, the unit is to be shut off, the following precautionary measures must be taken:

1.Shut off gas supply.

2.Shut off water supply.

3.Shut off electrical supply.

4.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 (see FIG. 3).

5.Drain pump and piping.

DRAIN PLUG DRAIN PLUG

FIG. 3 Draining Unit

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.

WARNING: Do not use undiluted or

automotive type antifreeze.

2.A solution of 50% antifreeze will provide maximum protection of approximately -30°F (-34°C).

3.Follow the instructions from the antifreeze manufacturer. Quantity of antifreeze required based on total system volume including expansion tank volume.

4.Glycol is denser than water and changes the viscosity of the system. The addition of glycol will decrease heat transfer and increase frictional loss in the boiler and related piping. A larger pump with more capacity (15% to 25% more) may be required to maintain desired flow rates and prevent a noise problem in a glycol system.

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

COMBUSTION AND VENTILATION AIR

Provisions for combustion and ventilation air must be in accordance with Section 5.3, Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA- B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.

Provide properly-sized openings to the equipment room to assure adequate combustion air and proper ventilation when the unit is installed with conventional venting or sidewall venting.

Combustion Air Filter

This unit has a standard air filter located at the combustion air inlet. This filter helps ensure clean air is used for the combustion process. Check this filter every month and replace when it becomes dirty. The filter size on the 399,999 - 750,000 units is 12" x 12" x 1" (30.5cm x 30.5cm x 2.5cm) and 16" x 16" x 1 (40.6cm x 40.6cm x 2.5 cm) on the 990,000 - 2,070,000 units. You can find these commercially available filters at any home center or HVAC supply store.

For convenience and flexibility, you can direct the combustion air inlet from either the back or right side of the unit. To arrange the combustion air inlet for side entry, follow the steps below:

1.Remove the metal panel from the unit’s side wall (see FIG. 4).

2.Remove screws from the air filter/bracket assembly.

3.Move the filter/bracket assembly from the rear of unit to the side opening (see FIG. 5).

4.Attach filter/bracket assembly to the unit’s side using the pre-drilled screw holes.

5.Attach the metal panel to the rear combustion air opening to seal it off.

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