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(d)Drain the unit completely. Remove the caps from the two drains located on the rear of the appliance. Open the relief valve and manually open the bypass valve to allow air into the system so the water will drain out. Open the union fitting on the inlet so water can be drained from the secondary heat exchanger.
(e)Ensure that the pump, bypass piping and connecting piping are fully drained.
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 or any potable water is possible.
CAUTION
DO NOT use undiluted or automotive type antifreeze.
2.A solution of 50% antifreeze will provide maximum protection of approximately
3.Follow the instructions from the antifreeze manufacturer. Quantity of antifreeze required is 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. An increased flow rate through the boiler heat exchanger may be required to achieve proper heat transfer rates in a glycol system. Reduced flow in a boiler due to a high percentage of glycol in the system may result in boiler noise or flashing to steam.
5.Local codes may require a back flow preventer or actual disconnect from city water supply when antifreeze is added to the system.
WATER TREATMENT
WARNING
DO NOT attempt to fire this appliance without completely filling the heat exchangers, bypass and all related system piping. Ensure that all air is properly bled from the system before firing. Failure to properly fill the boiler and related piping before firing may result in personal injury or non- warrantable property damage.
HEATING BOILER INSTALLATIONS
PIPING OF THE BOILER SYSTEM
The drawings in this section show typical boiler piping installations. This boiler MUST always be installed in a primary/secondary piping system for proper operation. Before beginning the installation, consult local codes for specific plumbing requirements. The installation should provide unions and valves at the inlet and outlet of the boiler so it can be isolated for service. An air separation device must be supplied in the installation piping to eliminate trapped air in the system. Locate a system air vent at the highest point in the system. The system must also have a properly sized expansion tank installed. Typically, an air charged
CAUTION
A leak in a boiler “system” will cause the “system” to intake fresh water constantly, which will cause the tubes to accumulate a line/scale build up. This will cause a NON-
WARRANTABLE FAILURE.
WATER CONNECTIONS
HEATING BOILERS ONLY
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
All boilers have 3 inch (76.2mm) copper pipe inlet and outlet connections. Installed piping to and from the boiler must be a minimum of 3 inches (76.2mm) diameter and must not exceed the maximum specified piping length. Caution: Field installed reducing bushings must not be used. Any reduction in pipesize may decrease flow resulting in high water temperatures, boiler noise, flashing to steam and
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