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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit
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1. Attach hose to balance and purge hose connector and run to drain.
2. Close the other side of the balance and purge valve.
3. Open first zone balance and purge valve, so as to let the water flow out of the hose. If zone valves are used, open zone valves
one at a time, manually. (NOTE: please check manufacturer’s instructions prior to opening valves manually, so as not to
damage the valve.)
4. Manually operate fill valve regulator. When water runs out of hose, connected to the balance and purge valve, in steady stream
(with no air bubbles), close balance and purge valve to stop the water from flowing. Disconnect hose and connect to next zone
to be purged.
5. Repeat procedure for additional zones (one at a time).
Upon completion, make sure that the fill valve is in automatic position and each zone balance and purge valve is in the open position
and zone valves are positioned for automatic operation.
NOTE: Installations that incorporate Standing Iron Radiators and systems with manual high point vents:
Follow the above procedure, then starting with nearest manual air vent, open vent until water flows out; close vent. Repeat
procedure, working your way toward furthest air vent. It may be necessary to install a basket strainer or filtration in an older hydronic
system where larger amounts of sediment may be present. Periodic cleaning of the strainer may be necessary.
For boiler water and/or odd water systems, please make note of these additional guidelines:
• Thoroughly flush the system (without boiler connected) to remove sediment. The high-efficiency heat exchanger can be
damaged by build-up or corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing compounds in the boiler system. Gaskets and seals in the system may be
damaged. This can result in substantial property damage.
• Do not use ‘homemade cures’ or ‘boiler patent medicines’. Serious damage to the boiler, personnel, and/or property may
result.
• Continual fresh make-up water will reduce boiler life. Mineral buildup in the heat exchanger reduces heat transfer,
overheats the stainless steel heat exchanger, and causes failure. Addition of oxygen carried in by makeup water can
cause internal corrosion in system components. Leaks in boiler or piping must be repaired at once to prevent makeup
water.
Fill & Purge Heating System
Removing Air From The Heat Exchanger
The ABH 299–599 has an automatic air vent on the top of the appliance and the air vent cap must be loosened to allow trapped
air to escape when the appliance is initially filled and put into operation. If this air vent should start to leak, there are two possible
solutions:
• Close the cap—the air vent is not needed anymore after the heat exchanger has been purged of air. This air vent MUST be
operable if the appliance is drained and refilled.
• Replace the air vent. When replacing the air vent, the water must be shut off and pressure released first.
Piping - continued