Manual • Installation • Start-Up • Usage • Maintenance • Parts

A6 Water heater maintenance  continued

Filling

Draining

See Filling the Inner (Domestic Water) Tank, and Filling the Outer (Boiler Water) Tank, on page 16.

Drain water heater if it will be shut off and exposed to freezing temperatures. Freezing water will expand and may damage water heater.

If boiler water contains sufficient antifreeze, then only the domestic water needs to be drained.

If boiler water does not contain sufficient antifreeze, then the boiler water and the domestic water must be drained.

Close boiler water isolation valves and relieve pressure to below 15 psi in outer tank before draining inner tank to prevent damage to inner tank.

If antifreeze is used in boiler water, check concentration. Boiler water (including additives) must be practically non-toxic, having toxicity rating or class of 1, as listed in Clinical Toxicol- ogy of Commercial Products. Inhibited propylene glycol is recommended. Follow antifreeze manufacturer’s instructions.

Do not use automotive, ethylene glycol or petroleum-based antifreeze. Do not use any undiluted antifreeze. This can cause severe personal injury, death or substantial property damage if ignored.

Water from opened drain valves, unions and other connections may be extremely hot. To avoid severe personal injury, death or substantial property damage:

•Tighten all drain hose connections.

•Direct hot water away from all persons.

Draining inner (domestic water) tank

Draining outer (boiler water) tank

See piping drawings, pages 9–12.

1.Disconnect power supply to water heater.

•If outer (boiler water) tank pressure is greater than 15 psig, relieve boiler pressure to less than 15 psig, and close isolation valves before proceeding.

2.Close cold water supply isolation valve.

3.Remove cap and connect a hose to domestic water drain valve. Hose should extend to drain at floor level to allow siphoning of domestic water tank.

4.Open union on domestic water outlet or hot water faucet at highest point above heater.

5.Open domestic water drain valve to start siphoning.

6.When draining is complete, close union or hot water faucet and domestic water drain valve.

See piping drawings, pages 9–12.

1.Disconnect power supply to water heater.

2.Close boiler water isolation valves between water heater and boiler.

3.Connect hose to boiler water drain valve at water heater. Open and drain water to a safe place.

4.To speed draining, loosen air vent on top of tank.

5.When draining is complete, close drain valve and retighten air vent.

Part Number PLUS-E017-A/1206

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Weil-McLain PLUS-E017-A/1206 manual A6 Water heater maintenance , Filling Draining, Draining inner domestic water tank
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PLUS-E017-A/1206 specifications

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