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Part Number PLUS-E017-A/1206
21
Manual • Installation • Start-Up • Usage • Maintenance • Parts
Filling
See Filling the Inner (Domestic Water) Tank, and Filling the Outer (Boiler Water) Tank,
on page 16.
Draining
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.
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.
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.
Draining inner
(domestic 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.
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 outer
(boiler water) tank
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.
Water heater maintenance continuedA6